JP7441158B2 - dental treatment equipment - Google Patents

Description

The present invention relates to a dental treatment device that applies high-frequency current to a dental treatment site.

In the field of dentistry, root canal treatment of teeth is sometimes performed to remove the pulp or suppress inflammation at the root apex. Conventional root canal treatment involves cutting and enlarging the root canal using a reamer and file, removing contaminated tissue and contaminants within the root canal, and then filling the root canal with medicine. Ta.

However, the shape of root canals is complex and differs depending on the type of tooth and person. Therefore, during root canal treatment, there are areas where it is difficult to expand the root canal using reamers and files, and inflammatory factors remain in areas where root canal expansion cannot be performed, causing inflammation after surgery. There was a case.

Therefore, Patent Document 1 discloses a dental medical device that applies a high-frequency electronic pulse to the inside of a root canal. In this medical device, a needle-shaped electrode (for example, a file) is inserted into a root canal, and when the tip of the needle reaches the root apex, a high-frequency electronic pulse is applied to cauterize the dental pulp.

Further, Patent Document 2 discloses a dental treatment device that performs root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal of a tooth. In this dental treatment device, an electrode inserted into a root canal is included in a dental instrument that communicates with a measuring device that measures the position of a root apex. Additionally, the dental instrument can communicate with a unit that applies electrical pulses. Therefore, the dental treatment device can apply electrical pulses to the root canal via an electrode inserted into the root canal, and the applied electrical pulse can reduce inflammatory factors, bacteria, etc. in the root canal. I can do it.

Patent No. 4041165 International Publication No. 2008/114244

However, bone defects may occur at the root apex, and when such bone defects occur, there are problems such as a delayed postoperative course.

The present invention has been made to solve the above problems, and provides a dental treatment device that can promote a favorable postoperative course even in cases where bone defects occur in the root canal or root apex. The purpose is to

A dental treatment device according to the present disclosure is a dental treatment device that applies a high-frequency current to a dental treatment site, and includes a holding part that holds an electrode arranged so that the high-frequency current can be passed from a root canal to a dental treatment site. , a power supply unit that passes high-frequency current to the electrodes, a control unit that can set multiple output ranges for passing high-frequency current from the power supply unit to the electrodes, and a detection unit that detects the value of the current that is passed from the power supply unit to the electrodes. The control unit sets at least a first output range and a second output range in which a high frequency current of 25 times or more is applied to the current value in the first output range , and A preliminary current having a current value smaller than the current value is passed from the power supply unit to the electrode, and the power supply unit controls the current value of the high-frequency current to be passed through the electrode based on the current value of the preliminary current detected by the detection unit. conduct .

In the dental treatment apparatus according to the present disclosure, the control unit may set at least a first output range and a second output range in which a high-frequency current is passed that is 25 times or more higher than the current value in the first output range. As a result, the dynamic range of the output range is large, and it is possible to promote a good postoperative course in both normal root canal treatment and bone regeneration in root canals and root apices where bone defects have occurred.

1 shows an external view of a dental treatment device according to Embodiment 1. FIG. 1 is a block diagram showing the configuration of a dental treatment apparatus according to Embodiment 1. FIG. FIG. 2 is a schematic diagram for explaining the root canal of a tooth. FIG. 3 is a diagram showing a waveform of a current applied to an electrode of the dental treatment device according to the first embodiment. 7 is a diagram showing a waveform of a current applied to an electrode of a dental treatment device according to a second embodiment. FIG. 7 is a flowchart for explaining control of the dental treatment apparatus according to Embodiment 2. FIG. 7 is a flowchart for explaining control of the sterilization mode of the dental treatment apparatus according to the second embodiment. FIG. 7 is a diagram showing a waveform of a current applied to an electrode of a dental treatment device according to a modification of the second embodiment. 7 is a diagram showing a waveform of a current applied to an electrode in a sterilization mode of the dental treatment apparatus according to Embodiment 3. FIG. 12 is a flowchart for explaining control of the dental treatment apparatus according to Embodiment 3. 12 is a flowchart for explaining control of the sterilization mode of the dental treatment apparatus according to the third embodiment. 12 is a flowchart for explaining control of the sterilization mode of the dental treatment apparatus according to the fourth embodiment.

Embodiments according to the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 shows an external view of a dental treatment apparatus according to a first embodiment. FIG. 2 is a block diagram showing the configuration of the dental treatment apparatus according to the first embodiment. FIG. 3 is a schematic diagram for explaining the root canal of a tooth. Root canal treatment, which involves cutting and enlarging a tooth's root canal, is an extremely difficult treatment because the degree of curvature of the root canal and the degree of calcification and blockage of the root canal vary from person to person. A tooth 900 shown in FIG. 3 is a molar, and one tooth includes a plurality of root canals 901. It is difficult to treat all such complexly shaped root canals. In particular, there are parts where it is difficult to cut and enlarge the root canal using cutting tools such as reamers and files, and the root canal cannot be cut and enlarged in these parts, causing pulp and inflammatory factors to build up inside the root canal. If left in place, inflammation could occur after surgery.

Therefore, in dental treatment devices, treatment is performed by inserting an electrode into the root canal and passing a high-frequency current through the electrode. This treatment involves applying high-frequency current to the human body, especially teeth, including root canals, periodontal tissues, and bones. cauterize to reduce inflammatory factors, bacteria, etc. It should be noted that this treatment does not need to be able to completely sterilize the tooth, as long as it can thermally denature the dental pulp and granulation to cause necrosis and deactivation. This treatment is also called EMAT (Electro-Magnetic Apical Treatment), and is described in the literature (for example, Naoki Bando, Toshihiko Tominaga, Hiromichi Yumoto, Takashi Sumitomo, Saki Hirao, Koji Hirao, Takashi Matsuo, ``Endodontic therapy using electromagnetic radiation Applications to EMAT (Electro-Magnetic Apical Treatment), 2011, Journal of Endodontics, Vol. 32, p. 184-200). The disclosure reports that by applying high-frequency current to the affected area before and after treatment, inflammatory factors, bacteria, etc. in the dental treatment area can be reduced, resulting in an extremely favorable prognosis.

Furthermore, research has been conducted to promote bone regeneration using weak electric currents, including direct current stimulation (DC method), alternating current stimulation (AC method), and capacitively coupled electrical stimulation (CCEF method). ) etc. are known. In particular, the literature (Yumoto H, Hirao K, Tominaga T, Bando N, Takahashi K, Matsuo T "Electromagnetic wave irradiation promotes osteoblastic cell proliferation and up-regulates growth factors via activation of the ERK1/2 and p38 MAPK pathways." Cell Physiol Biochem, 35:601-615, 2015.) reported that stimulation of osteoblasts with high frequencies of 500 kHz to 1000 kHz for just 5 seconds promoted cell proliferation and produced growth factors.

Therefore, in the dental treatment device 10 according to the first embodiment, it is possible to apply a high-frequency current to an electrode inserted into a root canal, and to promote bone regeneration at a site where a bone defect has occurred in a root canal or apex. It is configured so that it can be done. In other words, the dental treatment device 10 has a bone regeneration mode in which bone regeneration is promoted by passing a high-frequency current with a weak current value through an electrode inserted into a root canal, and a bone regeneration mode in which bone regeneration is promoted by passing a high-frequency current with a weak current value through an electrode inserted into a root canal. The user can switch between a sterilization mode in which the inside of the root canal is sterilized by applying a high-frequency current with a current value of . Note that the dental treatment apparatus 10 may be a bone regeneration-dedicated apparatus that operates only in a bone regeneration mode that promotes bone regeneration.

Specifically, as shown in FIG. 1, the dental treatment device 10 includes a unit 12 for applying high-frequency current to a file 11 (see FIG. 2), which is a cutting tool, and a file holder 13 for holding the file 11. , and can apply a high frequency current to the file 11 attached to the tip of the file holder 13. Note that in the present disclosure, the file 11 is attached to the tip of the file holder 13, and the file 11 is described as an electrode to be placed in a dental treatment area, but a configuration in which the file holder 13 and the file 11 are integrated is also possible. good.

The file holder 13 is formed of a substantially rod-shaped casing and can hold the metal portion of the file 11. The file holder 13 can electrically connect the file and the unit 12 by holding the metal part of the file 11. The unit 12 is provided with a display section 14 and a setting operation section 15, and is also connected to a foot switch 16 and a passive electrode 22.

As shown in FIG. 2, the unit 12 includes a display section 14, a setting operation section 15, a high frequency signal generation circuit 19, a detection section 20, a control circuit 21, a root canal length measurement circuit 23, and switches SW1 to SW2. is provided.

The setting operation section 15 is a setting button provided for setting the operation of the dental treatment apparatus 10. In the setting operation section 15, it is possible to set the current value, frequency, energization period, display settings of the display section 14, etc. of the high-frequency current applied to the file 11. Here, the energization period is the time for one energization when high-frequency current is energized in one shot in one operation, and the energization period is divided into multiple times in one operation. In this case, it is the sum of the times for energizing divided into multiple parts.

The foot switch 16 is an operation section provided for controlling the conduction of high-frequency current, and when the foot switch 16 is pressed by the user, a control signal is transmitted from the control circuit 21 to the high-frequency signal generation circuit 19. The high-frequency signal generation circuit 19 energizes the file 11 with the high-frequency current set by the setting operation section 15 based on the received control signal.

The high-frequency signal generating circuit 19 generates a signal between the file 11 and the passive electrode 22 in the sterilization mode at a frequency of, for example, 300 kHz to 1000 kHz and a current value of 20 mA to 200 mA (to reduce inflammatory factors, bacteria, etc. in the root canal). (2nd output range). Furthermore, the high-frequency signal generating circuit 19 generates a signal between the file 11 and the passive electrode 22 in the bone regeneration mode at a frequency of, for example, 300 kHz to 1000 kHz and a current value of 10 μA to 3 mA (when a bone defect occurs in the root canal or apex). A high-frequency current (current value required for root canal treatment to promote bone regeneration at the site) is applied (first output range). The high-frequency signal generation circuit 19 is configured such that the current value (second output range) of the high-frequency current that is applied to the file 11 in the sterilization mode is approximately 25 times higher than the current value (first output range) of the high-frequency current that is applied to the file 11 in the bone regeneration mode. This will be more than double. Of course, the high frequency current that can be generated by the high frequency signal generation circuit 19 is not limited to the above frequency and current value.

FIG. 4 is a diagram showing the waveform of the current flowing through the electrodes of the dental treatment device according to the first embodiment. The user switches between the sterilization mode and the bone regeneration mode using the setting operation section 15 and operates the foot switch 16 in the energization position to apply high frequency current to the file 11 from the high frequency signal generation circuit 19. The waveform shown in FIG. 4(a) is the waveform when the high-frequency signal generation circuit 19 is driven in the sterilization mode, and is the current value necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal. This is a waveform obtained by applying a high-frequency current with a current value in the range of (for example, 30 mA to 50 mA). On the other hand, the waveform shown in FIG. 4(b) is a waveform when the high-frequency signal generation circuit 19 is driven in the bone regeneration mode, and is used to promote bone regeneration at the site where a bone defect has occurred in the root canal or apex. This is a waveform obtained by applying a high-frequency current with a current value (for example, 1 mA or less) necessary for root canal treatment.

The current value, frequency, energization period, etc. of the high frequency current output from the high frequency signal generation circuit 19 can be set by operating the setting operation section 15. A control circuit 21 controls the high frequency signal generation circuit 19 based on the current value detected by the detection unit 20 so that the high frequency signal generation circuit 19 can output the current value of the high frequency current set by the setting operation unit 15. . However, if the control circuit 21 does not control the high frequency signal generation circuit 19 based on the current value detected by the detection section 20, the detection section 20 may not be provided in the dental treatment apparatus 10. Note that when applying high-frequency current, the file 11 is inserted into the root canal 901, its tip is applied to the tissue near the root apex 903, and the passive electrode 22 is applied to the patient's body, such as the gums 902 or lips 904. can be applied to a part of That is, the file holder 13 is a holding part that holds the file 11, which is an electrode placed at a dental treatment site, and the high-frequency signal generation circuit 19 is a power supply part that supplies high-frequency current to the electrode.

The detection unit 20 is a current detector that detects the value of the current that actually flows through the file 11 when a high-frequency current is applied to the file 11 from the high-frequency signal generation circuit 19 . The control circuit 21 controls the current value of the high frequency current that is supplied to the file 11 based on the current value detected by the detection unit 20, with respect to the high frequency signal generation circuit 19. The control circuit 21 has a hardware configuration including, for example, a CPU (Central Processing Unit), a storage unit that stores programs and data for causing the CPU to execute the processing, and a RAM (Random Access Memory) that functions as a work area for the CPU. ), a GPU (Graphics Processing Unit) that mainly performs image processing, and an input/output interface to maintain signal consistency with peripheral devices. The storage unit includes a storage device such as a nonvolatile memory provided inside the control circuit 21, a storage device connected via a network, and the like.

The root canal length measuring circuit 23 measures the tip position of the file 11 by passing a root canal length measuring signal between the file 11 and the passive electrode 22 . Specifically, the root canal length measurement circuit 23 applies voltages of two different frequencies between the file 11 and the passive electrode 22 to obtain the respective impedance values, and calculates the impedance values of the two values (actually, The position of the tip of the file 11 from the root apex 903 is specified from the difference or ratio between the voltage and current values corresponding to the impedance values. Note that the measurement method for measuring root canal length is not limited to the above method, and various techniques including conventionally proposed measurement methods can be used. Even when measuring root canal length, the passive electrode 22 is applied to a part of the patient's body, such as the gums 902 or the lips 904.

The switch SW1 is provided to switch the electrical connection between the file 11 and the high frequency signal generation circuit 19 or the root canal length measurement circuit 23. Further, the switch SW2 is provided to switch the electrical connection between the passive electrode 22 and the high frequency signal generation circuit 19 or the root canal length measurement circuit 23.

Switching between the switch SW1 and the switch SW2 is realized by the control circuit 21 based on input information from the setting operation section 15. Specifically, when the high-frequency current is applied to the file 11, the control circuit 21 controls the switch SW1 and the switch SW2 so that the file 11 and the passive electrode 22 are connected to the high-frequency signal generation circuit 19. In addition, when the root canal length measurement signal is passed between the file 11 and the passive electrode 22, the control circuit 21 also controls the switch SW1 and the switch so that the file 11 and the passive electrode 22 are connected to the root canal length measurement circuit 23. Controls SW2. In the first embodiment, the connection destinations of the file 11 and the passive electrode 22 are switched by controlling the switch SW1 and the switch SW2 according to the operation mode set by the setting operation section 15. Note that the switching of the switch SW1 and the switch SW2 may be linked to the on/off operation of the foot switch 16.

In the first embodiment, the high frequency signal generation circuit 19 and the root canal length measurement circuit 23 are electrically separated by the switch SW1 and the switch SW2. Therefore, while the high frequency current is being output to the file 11, the root canal length measuring circuit 23 is electrically disconnected from the file 11 and the passive electrode 22 by the switch SW1 and the switch SW2. Therefore, the high frequency current is not applied to the root canal length measuring circuit 23, and it is possible to suppress the root canal length measuring circuit 23 from malfunctioning due to the high frequency current.

Furthermore, in the first embodiment, the root canal length measuring circuit 23 can determine the position of the tip of the file 11 from the root apex. Therefore, after confirming with the root canal length measuring circuit 23 that the tip position of the file 11 in the root canal has reached the position where high-frequency current is applied, the user operates the setting operation section 15 to adjust the length of the root canal. It is possible to switch from long measurement mode to high frequency energization mode. Therefore, in the dental treatment apparatus 10, high frequency current can be applied to the file 11 while maintaining the tip position of the file 11 at an appropriate position. Of course, the dental treatment device 10 may be configured only to apply high-frequency current to the file 11 without providing the root canal length measurement circuit 23, and check the tip position of the file 11 with another root canal length measuring device. Alternatively, a high frequency current may be applied to the file 11.

The display section 14 is composed of, for example, a liquid crystal display, and displays the current value being applied to the file 11 by the high frequency signal generation circuit 19, the position of the tip of the file 11 measured by the root canal length measurement circuit 23, etc. It functions as a notification section that notifies the user of the dental treatment device 10 of necessary information. For example, the display unit 14 turns off the current when the current value detected by the detection unit 20 falls outside the range of current values necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal. Information indicating that the current value of the high-frequency current being used is outside the range of current values necessary for the root canal treatment may be notified. Note that the display section 14 may be configured with an organic EL display, electronic paper, a light emitting diode, or the like. In addition to the display section 14, the notification section may be a lamp, a speaker, etc. (not shown), and may notify the user by lighting the lamp or output a buzzer sound from the speaker. You can also

As described above, the dental treatment device 10 according to the first embodiment is a dental treatment device that applies high-frequency current to a dental treatment site (for example, a root canal). The dental treatment device 10 includes a file holder 13 that holds a file 11 placed at a dental treatment site, a high frequency signal generation circuit 19 that supplies a high frequency current to the file 11, and a high frequency signal generation circuit 19 that supplies a high frequency current to the file 11 from the high frequency signal generation circuit 19. It includes a control circuit 21 that can set a plurality of output ranges for energizing. The control circuit 21 sets at least a first output range and a second output range in which a high frequency current that is 25 times or more higher than the current value in the first output range is passed. Preferably, the plurality of output ranges to be set include at least an output range in which the current value of the high-frequency current is 1 mA or less.

With this configuration, the dental treatment device 10 according to the first embodiment can energize the electrodes with a high-frequency current at a current value in the first output range that is 1/25th or less of the second output range. Therefore, it is possible to promote bone regeneration in the root canal and root apex where bone defects have occurred, and promote a favorable postoperative course.
(Embodiment 2)
In Embodiment 1, the dental treatment apparatus 10 was described in which a high-frequency current having a preset current value is applied to the file 11 in the sterilization mode and the bone regeneration mode. In the second embodiment, control of the current value of the high-frequency current flowing through the file 11 will be explained in detail. In addition, in Embodiment 2, the same components as those of the dental treatment apparatus 10 described in Embodiment 1 are given the same reference numerals, and detailed description thereof will not be repeated. Further, the contents described in the first embodiment can be combined with the second embodiment to the extent that it does not conflict with the second embodiment.

In Embodiment 2, a case will be described in which the dental treatment apparatus 10 is first operated in a sterilization mode for sterilizing the root canal, and then switched to a bone regeneration mode for promoting bone regeneration in the root canal. FIG. 5 is a diagram showing the waveform of the current flowing through the electrodes of the dental treatment device according to the second embodiment. The user determines the energization position of the high frequency current based on the root canal length measurement circuit 23, and operates the foot switch 16 at the energization position to cause the high frequency signal generation circuit 19 to energize the file 11 with the high frequency current. The dental treatment apparatus 10 operates in a sterilization mode that sterilizes root canals as a high frequency energization mode.

First, the high-frequency signal generation circuit 19 supplies a high-frequency current to the file 11 in advance before the high-frequency current is supplied to the file 11 in earnest. The energization during the first period (TP1) shown in FIG. 5 is preliminary energization, and the subsequent second period (TP2) is full-scale energization. Note that the diagram shown in FIG. 5 is a conceptual diagram, and the illustrated wave number is different from the actual high frequency wave number. The same applies to high frequency waveforms below. In the second period of energization, a high-frequency current is applied with a current value within the current value range (for example, 30 mA to 50 mA) necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal. In the first period of energization, if a current value smaller than the minimum current value (for example, 30 mA) within the range of current values necessary for the root canal treatment is applied as a preliminary current, the pain during the first period of energization will be reduced. etc. can be reduced. Note that the high frequency signal generation circuit 19 includes a constant voltage circuit, and supplies high frequency current to the file 11 under constant voltage control. Therefore, the high-frequency signal generation circuit 19 applies a high-frequency voltage lower than the high-frequency voltage applied during the second period in the first period, thereby applying a current value smaller than the current value applied during the second period to the first period. It can be energized during the period. Of course, there may be no difference between the current value applied during the first period and the current value applied during the second period. Further, the high-frequency signal generation circuit 19 may be configured as a constant current circuit, and the high-frequency current may be applied to the file 11 under constant current control. When the high frequency signal generation circuit 19 includes a constant current circuit and supplies a high frequency current to the file 11 by constant current driving, the control circuit 21 controls the file 11 when the voltage value of the output voltage of the constant current circuit is equal to or higher than a predetermined value. The high-frequency signal generating circuit 19 may be controlled to not start or stop the high-frequency current flowing to the high-frequency signal generating circuit 19 . In addition, when the voltage value of the output voltage of the constant current circuit becomes equal to or higher than a predetermined value and the high-frequency current is stopped flowing from the high-frequency signal generating circuit 19 to the file 11, the control circuit 21 provides information indicating that the high-frequency current has stopped flowing. may be displayed on the display unit 14.

The control circuit 21 controls the voltage of the high-frequency signal generation circuit 19 so that the current value of the preliminary current is applied to the file 11, assuming that the path from the file 11 to the passive electrode 22 has a normal impedance. do. Then, a preliminary voltage is applied to supply a preliminary current from the high-frequency signal generation circuit 19 to the file 11, and if the impedance of the path from the file 11 to the passive electrode 22 changes from normal, it is detected by the detection unit 20. The current value differs from the assumed current value of the preliminary current. Note that the impedance of the path from the file 11 to the passive electrode 22 changes depending on the presence or absence of an insulating film formed on the surface of the file 11, the presence or absence of adhesion of blood or protein to the surface of the file 11, the impedance of the root canal, etc. do.

The control circuit 21 controls the current value of the high-frequency current flowing from the high-frequency signal generation circuit 19 to the file 11 during the second period of energization to a predetermined value based on the current value detected by the detection unit 20 when the preliminary current is passed through the file 11. control to be within the range. Depending on the difference or ratio between the assumed preliminary current value and the current value detected by the detection unit 20, the control circuit 21 determines the optimal voltage so that the current value of the high-frequency current flowing through the file 11 is within a predetermined range. The signal is changed and applied to the high frequency signal generation circuit 19. That is, the control circuit 21 optimizes the voltage applied to the high frequency signal generation circuit 19 so that the current value of the high frequency current flowing through the file 11 is within a predetermined range. Here, the predetermined range is the range of current values necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal, and being within the predetermined range means depending on the symptoms. Three cases are possible: (1) greater than or equal to a predetermined value, (2) less than or equal to a predetermined value, and (3) greater than or equal to a first predetermined value and less than or equal to a second predetermined value (>first predetermined value). Generally, (3) a value greater than or equal to the first predetermined value and less than or equal to the second predetermined value (>first predetermined value) is often used. Note that the current value of the high-frequency current flowing through the file 11 is not limited to the current value necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal. Further, although it has been described that the control circuit 21 compares the current value of the preliminary current and the current value detected by the detection unit 20 based on a difference, other comparison methods such as a ratio may be used.

The high-frequency signal generation circuit 19 conducts electricity for, for example, 0.02 seconds (20 ms) as a first period, then opens a rest period (TC) of, for example, 0.03 seconds (30 ms), and then sets a second period of, for example, 0.03 seconds (TC). Electricity is applied for 0.7 seconds (70 ms). The high-frequency signal generation circuit 19 generates N times (0.1 seconds (100 ms) in total) between the second period and the rest period (total 0.1 seconds (100 ms)) for one energization (for example, one operation of the foot switch 16). For example, 10 times). In the dental treatment apparatus 10, when the user depresses the foot switch 16 once, a high frequency current is applied from the high frequency signal generation circuit 19 to the file 11 for about 1 second (including a rest period). Note that the number of times the control is repeated between the pause period and the second period can be set in advance by the user using the setting operation section 15, and is set to 10 times, for example, in the second embodiment. Of course, the number of times the control is repeated during the pause period and the second period may be set to a value other than 10 times. In addition, in the setting operation unit 15, instead of setting the rest period and the second period as the number of times the control is repeated, the period may be set as the energization period (for example, 1 second).

Next, the dental treatment device 10 operates in the sterilization mode and then in the bone regeneration mode. In the bone regeneration mode, a high frequency current having a weak current value of about 1/25th of the current value of the high frequency current applied in the sterilization mode is applied from the high frequency signal generation circuit 19 to the file 11. The energization in the third period (TP3) shown in FIG. 5 is the energization in the bone regeneration mode. In the second period of energization, a high frequency current with a current value in a predetermined range (for example, 30 mA to 100 mA) is passed, but in the third period of energization, a high frequency current with a weak current value (for example, 10 μA to 1 mA) is passed. Power is applied to the file 11. In other words, the control circuit 21 sets the output range (second output range) to be energized in the second period, in which a high-frequency current that is 25 times or more is energized relative to the output range (first output range) to be energized in the third period. . More preferably, the current value in the output range (first output range) to which electricity is applied during the third period is 1 mA or less. Note that in FIG. 5, the length of the third period is shown to be shorter than the length of the second period, but the third period may have a length of about several seconds to about 5 seconds. The control circuit 21 also determines the current value of the high-frequency current flowing from the high-frequency signal generation circuit 19 to the file 11 during the third period of energization, based on the current value detected by the detection unit 20 when the preliminary current is passed through the file 11. The voltage applied by the high frequency signal generation circuit 19 may be determined so that the current value is a weak current value.

Next, control of the high frequency mode in which the file 11 is energized in the dental treatment apparatus 10 will be explained using a flowchart. FIG. 6 is a flowchart for explaining control of the dental treatment apparatus according to the second embodiment. FIG. 7 is a flowchart for explaining control of the sterilization mode of the dental treatment apparatus according to the second embodiment. First, the user determines the energization position of the high-frequency current based on the root canal length measurement circuit 23, and operates the dental treatment apparatus 10 in the bone regeneration mode at the energization position, or operates the dental treatment apparatus 10 in the sterilization mode. , and inputs the operation mode into the dental treatment apparatus 10 using the setting operation section 15. The control circuit 21 determines whether the operation mode input through the setting operation section 15 is the bone regeneration mode (step S10). If the input operation mode is not the bone regeneration mode (NO in step S10), the control circuit 21 determines that the operation mode is the sterilization mode, and notifies the display unit 14 of information to the effect that the sterilization mode will be executed. (Step S11). The control circuit 21 displays the operation mode to be executed in step S11 and starts processing in the sterilization mode shown in FIG.

On the other hand, if the input operation mode is the bone regeneration mode (YES in step S10), the control circuit 21 notifies the display unit 14 of information to the effect that the bone regeneration mode is to be executed (step S12). Further, the control circuit 21 applies a high frequency current to the file 11 at a current value applied in the bone regeneration mode (step S13). Here, the current value applied in the bone regeneration mode is a predetermined setting value, and can be set by the user using the setting operation section 15 or the like.

In order to promote bone regeneration, it is necessary to energize the file 11 inserted into the root canal with a set weak current value (set value) for a predetermined period (third period (TP3) shown in FIG. 5). Therefore, the control circuit 21 determines whether the current value detected by the detection unit 20 is within the set value (first output range) (step S14). If the current value detected by the detection unit 20 is not the set value (NO in step S14), the control circuit 21 causes the high frequency signal generation circuit 19 to make the current value of the high frequency current flowing to the file 11 become the set value. Adjust (step S15). After the control circuit 21 adjusts the high-frequency current to be supplied in step S15, the process returns to step S14 to perform feedback control. When the current value of the high-frequency current is feedback-controlled during the energization period, if the current value detected by the detection unit 20 changes and deviates from a predetermined range, the control circuit 21 displays the current value on the display unit 14 as a predetermined value. It is also possible to display a message to the effect that it is out of the range.

If the current value detected by the detection unit 20 is approximately the set value (YES in step S14), the control circuit 21 determines whether the energization period in the bone regeneration mode has exceeded a predetermined period (step S16). . If the energization period in the bone regeneration mode has not exceeded the predetermined period (NO in step S16), the control circuit 21 returns the process to step S13. On the other hand, if the energization period in the bone regeneration mode has exceeded the predetermined period (YES in step S16), the control circuit 21 ends the operation in the bone regeneration mode. Although not shown, if YES in step S16, the control circuit 21 determines whether or not the sterilization mode is input in the setting operation section 15, and if the sterilization mode is input, the control circuit 21 determines whether or not the sterilization mode is input. The operation may be started. Note that an upper limit value and a lower limit value may be determined in order to determine whether the current value is approximately the set value.

Next, the operation in sterilization mode will be explained. First, when the user inputs the sterilization mode into the dental treatment apparatus 10 using the setting operation section 15 and operates the foot switch 16 in the energized position, the control circuit 21 causes the high frequency signal generation circuit 19 to transmit the sterilization mode to the file 11 for a first period. , a preliminary current is applied (step S101).

Next, the control circuit 21 determines the current value necessary for root canal treatment to reduce inflammatory factors, bacteria, etc. in the root canal, based on the current value detected by the detection unit 20 when the preliminary current is applied to the file 11. The voltage value of the high frequency signal generation circuit 19 for supplying the file 11 with a current value of high frequency current within a current value range (hereinafter also referred to as a predetermined range) is determined (step S102). Specifically, the control circuit 21 calculates the impedance of the root canal from the current value detected by the detection unit 20 and the voltage value applied to the high frequency signal generation circuit 19 at that time, and calculates the impedance of the root canal from the file 11 at the impedance of the root canal. The voltage value of the high frequency signal generating circuit 19 is determined so that the current value supplied to the high frequency signal generating circuit 19 is within a predetermined range. Note that the current value determined in step S102 is a current value that is applied in the sterilization mode, and is a set value that is set within a predetermined range. If the current value applied in bone regeneration mode is a current value within the first output range, the current value applied in sterilization mode is a current value within the second output range, which is 25 times the current value in the first output range. This is a high current value. After the first period has passed, the control circuit 21 stops the power supply from the high frequency signal generation circuit 19 to the file 11 for a rest period (step S103). Note that the control circuit 21 may measure the position of the tip of the file 11 by switching from the high frequency energization mode to the root canal length measurement mode during the rest period. In other words, the control circuit 21 may control the root canal length measurement circuit 23 to supply the measurement signal to the file 11 during the rest period.

The control circuit 21 increments the energization frequency counter by 1 in order to count the number of times the high-frequency current is energized during the second period (step S104). The control circuit 21 applies a current value within a predetermined range to the high frequency signal generating circuit 19 by applying the voltage value determined in step S102 from the high frequency signal generating circuit 19 to the file 11 for a second period. Then, power is applied to the file 11 for a second period (step S105). The control circuit 21 determines whether the current value detected by the detection unit 20 when the voltage value determined in step S102 is applied to the high-frequency signal generation circuit 19 is within a predetermined range (step S106).

If the detected current value is within a predetermined range (YES in step S106), the control circuit 21 determines whether the energization number counter is equal to or greater than N times (for example, 10 times) (step S107). . If the energization count counter is not N times or more (NO in step S107), the control circuit 21 returns the process to step S103 and repeats the control in the pause period and the second period. On the other hand, if the energization number counter is N times or more (YES in step S107), the control circuit 21 resets the energization number counter to 0 (zero) (step S108), and sends the high-frequency current to the file 11. Stops the process of energizing. Although not shown, the control circuit 21 determines whether or not the bone regeneration mode is input through the setting operation unit 15 after the process in step S108 (step S10), and if the bone regeneration mode is input, Operation in bone regeneration mode may also be started.

Returning to step S106, if the detected current value is not within the predetermined range (NO in step S106), the control circuit 21 detects that the current value of the high-frequency current being energized is outside the predetermined range. The information is displayed on the display unit 14 (step S110). Specifically, the control circuit 21 detects when a foreign object in the root canal comes off while applying high-frequency current to the file 11, and the current value detected by the detection unit 20 changes from a predetermined range (30 mA to 50 mA) to 60 mA, 90 mA, and 80 mA. If there is a change, it may be possible to display the words "outside the predetermined range" on the display unit 14 or to change the background color of the screen to yellow. If a speaker is provided as the notification section, information to the effect that the current value of the high-frequency current being energized is outside a predetermined range may be notified to the user by a warning sound.

Next, the control circuit 21 determines whether the current value detected by the detection unit 20 is smaller than the minimum current value within a predetermined range even if the voltage value determined in step S102 is applied to the high frequency signal generation circuit 19. It is determined whether or not (step S111). If the detected current value is outside the predetermined range (NO in step S105) and smaller than the minimum current value within the predetermined range (YES in step S111), the control circuit 21 energizes the file 11 with high frequency current again. Information indicating that processing is required is displayed on the display unit 14 (step S112). Specifically, the control circuit 21 may display the words "re-energize" on the display unit 14, or make the background color of the screen yellow and blink. If a speaker is provided as the notification section, information to the effect that it is necessary to reenergize may be notified to the user by a warning sound.

Further, the control circuit 21 measures the energization period in which the detected current value is smaller than the minimum current value within a predetermined range (step S113). In the flowchart shown in FIG. 7, instead of stopping the process of supplying high-frequency current to the file 11 when the detected current value becomes smaller than the minimum current value within a predetermined range, It stops after repeating the control N times (for example, 10 times). Therefore, the control circuit 21 measures the energization period smaller than the minimum current value based on how many times the second period in which the detected current value is smaller than the minimum current value within a predetermined range occurs out of the N repetitions. I can do it. By counting the energization period smaller than the minimum current value, the control circuit 21 only needs to energize again for the period counted in step S113 when energizing again. Of course, when stopping the process of applying high frequency current to the file 11 when the detected current value becomes smaller than the minimum current value within a predetermined range, the control circuit 21 changes the process to step S108 after step S113. You may migrate. Here, the case where it can be determined that the detected current value is smaller than the minimum current value within the predetermined range means that the environment inside the root canal changes while the current is being applied, and the impedance of the root canal increases and the current value falls within the predetermined range. This is a case where a current value smaller than the minimum current value flows. Further, if the detected current value is smaller than the minimum current value within a predetermined range, the control circuit 21 increases the voltage applied to the high frequency signal generation circuit 19 so that the current value of the high frequency current flowing through the file 11 becomes a predetermined value. The current value may be controlled to be equal to or greater than the minimum current value within the range of .

Returning to step S111, if the detected current value is outside the predetermined range (NO in step S105) and is not smaller than the minimum current value within the predetermined range (NO in step S111), the control circuit 21 detects the detected current value. Since it can be determined that the current value is larger than the maximum current value within the predetermined range, the process of applying high frequency current to the file 11 is stopped (step S115). In addition, in the control circuit 21, as in step S115, if the current value detected after the start of full-scale energization becomes larger than the maximum current value within a predetermined range, the control circuit 21 stops the energization. If the current value detected during energization becomes larger than the maximum current value within a predetermined range, full-scale energization is not started in the first place. The control circuit 21 displays information to the effect that the process of supplying high-frequency current to the file 11 has been stopped on the display unit 14 (step S116). Specifically, the control circuit 21 may display the word "stop" on the display unit 14, or make the background color of the screen red and blink. If a speaker is provided as the notification section, the information that the power supply has been stopped may be notified to the user by a warning sound. Here, when it can be determined that the detected current value is greater than the maximum current value within the predetermined range, the environment inside the root canal changes while the current is being applied, and the impedance of the root canal becomes low and the current value falls within the predetermined range. This is a case where a current value larger than the maximum current value flows. Further, if the detected current value is larger than the maximum current value within a predetermined range, the control circuit 21 reduces the voltage applied to the high frequency signal generation circuit 19 so that the current value of the high frequency current flowing through the file 11 becomes a predetermined value. The current value may be controlled to be equal to or less than the maximum current value within the range of .

In the examples shown in FIGS. 5 and 7, the current value of the high-frequency current that is supplied in the second period N times is a current within a predetermined range from the current value of the preliminary current detected in the first period once. The configuration for determining the voltage value of the high frequency signal generation circuit 19 that is the value has been described. However, when applying high frequency current to the file 11, the dental treatment apparatus 10 is not limited to the control shown in FIGS. 5 and 7. For example, the dental treatment apparatus 10 may be controlled to provide a first period in which the current value of the preliminary current is detected every time before energizing in the second period. That is, the control circuit 21 may perform feedback control of the current value to be applied in the second period based on the detection result of the preliminary current. When the current value of the high-frequency current is feedback-controlled during the energization period, if the current value detected by the detection unit 20 changes and deviates from a predetermined range, the control circuit 21 displays a current value on the display unit 14 indicating a predetermined current value. It is also possible to display a message to the effect that it is out of the range. For example, if a foreign object in the root canal comes off while applying high-frequency current to the file 11 and the current value detected by the detection unit 20 changes from a predetermined range (30mA to 50mA) to 60mA, 90mA, and 80mA, the display unit 14 displays a warning display when the current value is outside a predetermined range. Note that even if the current value detected by the detection unit 20 is within a predetermined range, if it changes by more than a predetermined percentage (for example, about ±30%), the current value of the high-frequency current being energized has suddenly changed. Information to that effect may be displayed on the display unit 14. Of course, the control circuit 21 may control the voltage applied to the high-frequency signal generation circuit 19 so that the current value of the high-frequency current flowing through the file 11 falls within the predetermined range when the current value is out of the predetermined range. good.

FIG. 8 is a diagram showing a waveform of a current applied to an electrode of a dental treatment apparatus according to a modification of the second embodiment. In FIG. 8, a first period that is a preliminary energization period and a second period that is a full-scale energization period are repeatedly provided. That is, the dental treatment apparatus 10 performs control to always provide the first period before energizing in the second period.

As shown in FIG. 8, the dental treatment device 10 is configured such that the current value of the high-frequency current supplied to the file 11 in the second period is within a predetermined range based on the current value of the preliminary current detected in the first period. The voltage value of the high frequency signal generation circuit 19 that will be determined each time is determined. Therefore, in the dental treatment apparatus 10, the current value can be controlled in accordance with changes in the conditions of the path from the file 11 to the passive electrode 22. Although not shown, the control circuit 21 may change the current value of the high-frequency current supplied to the file 11 in each second period.

As described above, in the dental treatment apparatus 10 according to the second embodiment, the control circuit 21 controls the high-frequency signal generation circuit 19 so that the current value of the high-frequency current to be energized to the file 11 is within the first output range. The bone regeneration mode (first control mode) for controlling and the current value of the high-frequency current applied to the file 11 are set to a current value within a second output range that is 25 times or more the current value in the first output range. It may also be possible to switch between a sterilization mode (second control mode) in which the high frequency signal generation circuit 19 is controlled. Thereby, the dental treatment apparatus 10 allows the user to select switching between the bone regeneration mode (first control mode) and the sterilization mode (second control mode) as the operation mode.

Furthermore, the dental treatment apparatus 10 further includes a detection unit 20 that detects the value of the current applied to the file 11 from the high frequency signal generation circuit 19. The control circuit 21 instructs the high-frequency signal generation circuit 19 to control the current value of the high-frequency current that is energized to the file 11 so that the current value detected by the detection unit 20 falls within the first output range in the bone regeneration mode. In the sterilization mode, the high-frequency signal generating circuit 19 controls the current value of the high-frequency current that is applied to the file 11 so that the current value detected by the detection unit 20 falls within the second output range. Thereby, the dental treatment apparatus 10 can perform feedback control so that the current value energized to the file 11 becomes the set value in each operation mode.

Further, the control circuit 21 has the second output range set to a current value within a predetermined range, and causes the high-frequency signal generation circuit 19 to supply a preliminary current with a current value smaller than the minimum current value in the predetermined range to the file 11; Based on the current value of the preliminary current detected by the detection unit 20, the high-frequency signal generation circuit 19 may control the current value of the high-frequency current that is energized to the file 11. As a result, the dental treatment device 10 adjusts the high-frequency current to be applied to the dental treatment area to an optimal current value before applying the high-frequency current to the file 11 in earnest while reducing tissue damage caused by the application of the preliminary current. Can be set.

Further, the control circuit 21 makes the first period in which the preliminary current is passed from the high-frequency signal generation circuit 19 to the file 11 shorter than the second period in which the high-frequency current is passed from the high-frequency signal generation circuit 19 to the file 11, and A rest period may be provided between the first period and the second period. Thereby, the dental treatment apparatus 10 can measure the position of the tip of the file 11 during the rest period. Note that the control unit may make the first period shorter than the second period. As a result, in the dental treatment apparatus 10, the period during which the preliminary current is applied is shortened, so that the period until the high-frequency current applied to the dental treatment area is set to the optimum current value can be shortened.

Furthermore, the control circuit 21 may control the high-frequency signal generation circuit 19 to repeatedly supply the high-frequency current to the file 11 by setting a period including the first period, the rest period, and the second period as one set. Thereby, the dental treatment apparatus 10 can set the optimum current value for each second period in which the high-frequency current is applied to the file 11.

Furthermore, when the detection unit 20 detects a current value larger than the maximum current value in a predetermined range, the control circuit 21 controls not to start or stop the high-frequency current flowing to the file 11, or controls the current value to be energized. Any of the reduction controls may be performed on the high frequency signal generation circuit 19. Thereby, the dental treatment device 10 can perform treatment without causing any burden or discomfort to the patient.

The control circuit 21 further includes a display unit 14 that notifies the user of information, and when the current value detected by the detection unit 20 is out of a predetermined range, the control circuit 21 controls the current value of the high-frequency current being energized. The display unit 14 may be made to notify information to the effect that it is outside a predetermined range. Thereby, the dental treatment apparatus 10 can appropriately notify the user of the status of the high-frequency current being supplied.

Further, when the detection unit 20 detects a current value larger than the maximum current value in a predetermined range and stops the high-frequency current from flowing from the high-frequency signal generation circuit 19 to the file 11, the control circuit 21 controls the high-frequency current The display unit 14 may be made to notify information that the energization has been stopped. Thereby, the dental treatment apparatus 10 makes it easier for the user to recognize the reason why the high-frequency current supply has stopped.

Furthermore, when the detection unit 20 detects a current value smaller than the minimum current value within a predetermined range, the control circuit 21 may cause the display unit 14 to display information urging the high-frequency current to be energized again. good. Thereby, the dental treatment apparatus 10 can notify information such as that inflammatory factors, bacteria, etc. in the dental treatment site are not sufficiently reduced.

Further, the control circuit 21 may measure a period in which the detection section 20 detects a current value smaller than the minimum current value in a predetermined range, and may cause the display section 14 to notify the measured period. Thereby, the dental treatment device 10 notifies the user of information such as how much remaining high-frequency current should be applied to the file 11 to ensure that inflammatory factors, bacteria, etc. in the dental treatment area are not sufficiently reduced. be able to.
(Embodiment 3)
In Embodiment 2, the dental treatment device 10 was described in which the current value of the high-frequency current applied to the file 11 in the second period is controlled based on the current value of the preliminary current detected in the first period in the sterilization mode. In the dental treatment apparatus according to Embodiment 3, the period in which the high-frequency current is applied in the bone regeneration mode is controlled based on the detected current value, and the period in which the high-frequency current is applied in the sterilization mode is controlled based on the current value of the preliminary current detected in the first period. , a configuration for controlling the energization period of the high-frequency current that is energized to the file in the second period will be described. In addition, in Embodiment 3, the same components as those of the dental treatment apparatus 10 described in Embodiment 1 are given the same reference numerals, and detailed description thereof will not be repeated. Furthermore, the contents described in the first embodiment can be combined with the third embodiment to the extent that they do not conflict with each other.

FIG. 9 is a diagram showing the waveform of the current applied to the electrode in the sterilization mode of the dental treatment apparatus according to the third embodiment. FIG. 9 shows the current waveform only in the sterilization mode, in which a first period, which is a preliminary energization period, and a second period, which is a full-scale energization period, are repeatedly provided. That is, the dental treatment apparatus 10 performs control to always provide the first period before energizing in the second period.

As shown in FIG. 9, the dental treatment apparatus 10 determines the energization period of the high-frequency current to be energized to the file 11 in the second period each time based on the current value of the preliminary current detected in the first period. The period during which the high-frequency current is applied is different in the second period, the second second period, and the third second period. That is, in the dental treatment apparatus 10, since a high frequency current is applied to the file 11 with a waveform as shown in FIG.

Next, control of the energization period of the high frequency current applied to the file 11 in the dental treatment apparatus 10 will be explained using a flowchart. FIG. 10 is a flowchart for explaining control of the dental treatment apparatus according to the third embodiment. FIG. 11 is a flowchart for explaining control of the sterilization mode of the dental treatment apparatus according to the third embodiment. First, the user determines the energization position of the high-frequency current based on the root canal length measurement circuit 23, and operates the dental treatment apparatus 10 in the bone regeneration mode at the energization position, or operates the dental treatment apparatus 10 in the sterilization mode. , and inputs the operation mode into the dental treatment apparatus 10 using the setting operation section 15. The control circuit 21 determines whether the operation mode input through the setting operation section 15 is the bone regeneration mode (step S10). If the input operation mode is not the bone regeneration mode (NO in step S10), the control circuit 21 determines that the operation mode is the sterilization mode, and notifies the display unit 14 of information to the effect that the sterilization mode will be executed. (Step S11). The control circuit 21 displays the operation mode to be executed in step S11 and starts processing in the sterilization mode shown in FIG. 11.

On the other hand, if the input operation mode is the bone regeneration mode (YES in step S10), the control circuit 21 notifies the display unit 14 of information to the effect that the bone regeneration mode is to be executed (step S12). Further, the control circuit 21 applies a high frequency current to the file 11 at a current value applied in the bone regeneration mode (step S13).

In order to promote bone regeneration, it is necessary to apply a set weak current value (set value) to the file 11 inserted into the root canal for a predetermined period of time. However, if a current value smaller than the set value (first output range) is energized to the file 11, in order to promote bone regeneration, it is necessary to extend the energization period in bone regeneration mode beyond the predetermined period. be. Therefore, the control circuit 21 determines whether the current value detected by the detection unit 20 is equal to or greater than a set value (first output range) (step S14A). If the current value detected by the detection unit 20 is smaller than the set value (NO in step S14A), the control circuit 21 adjusts the high frequency signal generation circuit 19 to extend the energization period to the file 11 from a predetermined period. (Step S15A). The control circuit 21 sets the predetermined period extended in step S15A to the predetermined period in step S16.

If the current value detected by the detection unit 20 is greater than or equal to the set value (YES in step S14A), the control circuit 21 determines whether the energization period in the bone regeneration mode has exceeded a predetermined period (step S16). . In addition, when the predetermined period is extended in step S15A, the control circuit 21 determines whether or not the energization period in the bone regeneration mode has elapsed with respect to the extended predetermined period. If the energization period in the bone regeneration mode has not exceeded the predetermined period (NO in step S16), the control circuit 21 returns the process to step S13. On the other hand, if the energization period in the bone regeneration mode has exceeded the predetermined period (YES in step S16), the control circuit 21 ends the operation in the bone regeneration mode. Although not shown, if YES in step S16, the control circuit 21 determines whether or not the sterilization mode is input in the setting operation section 15, and if the sterilization mode is input, the control circuit 21 determines whether or not the sterilization mode is input. The operation may be started.

Next, the operation in sterilization mode will be explained. First, when the user inputs the sterilization mode into the dental treatment apparatus 10 using the setting operation section 15 and operates the foot switch 16 in the energized position, the control circuit 21 causes the high frequency signal generation circuit 19 to transmit the sterilization mode to the file 11 for a first period. , a preliminary current is applied (step S101).

Next, the control circuit 21 determines the energization period of the high frequency current to be applied to the file 11 based on the current value detected by the detection unit 20 when the preliminary current is applied to the file 11 (step S102A). Specifically, for example, if the current value detected by the detection unit 20 is 20% lower than the current value passed through the file 11, the control circuit 21 determines the energization period of the high-frequency current to be 1.2 times longer. do. After the first period has elapsed, the control circuit 21 suspends power supply from the high frequency signal generation circuit 19 to the file 11 for a suspension period (step S103).

The control circuit 21 increments the energization frequency counter by 1 in order to count the number of times the high-frequency current is energized during the second period (step S104). The control circuit 21 controls the high frequency signal generating circuit 19 so that the high frequency current is passed from the high frequency signal generating circuit 19 to the file 11 for the second period determined in step S102A (step S105). The control circuit 21 causes a high frequency current to flow through the file 11 and determines whether the current value detected by the detection unit 20 is within a predetermined range (step S106).

If the detected current value is within a predetermined range (YES in step S106), the control circuit 21 determines whether the energization number counter is equal to or greater than N times (for example, 10 times) (step S107A). . If the energization number counter is not N times or more (NO in step S107A), the control circuit 21 returns the process to step S101 and repeats the control in the first period, the rest period, and the second period. The control circuit 21 provides a pause period (not shown) when returning the process to step S101. As described in the second embodiment, if the energization count counter is not equal to or greater than N times (NO in step S107A), the control circuit 21 returns the process to step S103 and controls the rest period and the second period. It may be repeated. On the other hand, if the energization number counter is N times or more (YES in step S107A), the control circuit 21 resets the energization number counter to 0 (zero) (step S108), and sends the high frequency current to the file 11. Stops the process of energizing. Although not shown, the control circuit 21 determines whether or not the bone regeneration mode is input through the setting operation unit 15 after the processing in step S108 (step S10), and if the bone regeneration mode is input, Operation in bone regeneration mode may also be started.

Returning to step S106, if the detected current value is not within the predetermined range (NO in step S106), the control circuit 21 detects that the current value of the high-frequency current being energized is outside the predetermined range. The information is displayed on the display unit 14 (step S110).

Next, the control circuit 21 causes a high frequency current to flow through the file 11 and determines whether the current value detected by the detection unit 20 is smaller than the minimum current value within a predetermined range (step S111). If the detected current value is outside the predetermined range (NO in step S105) and smaller than the minimum current value within the predetermined range (YES in step S111), the control circuit 21 energizes the file 11 with high frequency current again. Information indicating that processing is required is displayed on the display unit 14 (step S112).

Further, the control circuit 21 measures the energization period in which the detected current value is smaller than the minimum current value within a predetermined range (step S113).

Returning to step S111, if the detected current value is outside the predetermined range (NO in step S105) and is not smaller than the minimum current value within the predetermined range (NO in step S111), the control circuit 21 detects the detected current value. Since it can be determined that the current value is larger than the maximum current value within the predetermined range, the process of applying high frequency current to the file 11 is stopped (step S115). The control circuit 21 displays information to the effect that the process of supplying high-frequency current to the file 11 has been stopped on the display unit 14 (step S116).

As described above, in the dental treatment apparatus 10 according to the third embodiment, the control circuit 21 sets the setting value (first output range) of the bone regeneration mode or the sterilization mode based on the current value detected by the detection unit 20. The high-frequency signal generating circuit 19 controls the period during which a high-frequency current having a current value (second output range) is applied to the file 11 . With this configuration, the dental treatment apparatus 10 according to Embodiment 3 can control the energization period of the high-frequency current to be energized to the file 11 based on the current value detected by the detection unit 20. The high frequency current can be applied to the file 11 for a suitable period of time in response to changes in the situation.

Further, the control circuit 21 is configured such that the current value (second output range) in the sterilization mode is set to a current value within a predetermined range, and a preliminary current having a current value smaller than the minimum current value within the predetermined range is transmitted to the high frequency signal generation circuit. 19 to the file 11, and based on the current value of the preliminary current detected by the detection unit 20, controls the power supply unit to control the period during which the file 11 is energized with a high frequency current having a current value within a predetermined range. It's okay. Thereby, the dental treatment apparatus 10 can set the optimum energization period of the high-frequency current to be energized to the dental treatment site before applying the high-frequency current of the second period to the file 11.
(Embodiment 4)
In the first embodiment, based on the current value of the preliminary current detected in the first period in the sterilization mode, a high-frequency signal is generated such that the current value of the high-frequency current flowing through the file 11 in the second period falls within a predetermined range. The dental treatment device 10 that controls the voltage value of the generation circuit 19 has been described. In the dental treatment apparatus according to the fourth embodiment, in the sterilization mode, the file is energized in the second period so that the product of the current value of the preliminary current detected in the first period and the first period falls within a predetermined range. A configuration for controlling at least one of the current value and the energization period of the high-frequency current will be described. In addition, in Embodiment 4, the same components as those of the dental treatment apparatus 10 described in Embodiment 1 are given the same reference numerals, and detailed description thereof will not be repeated. Furthermore, the contents described in the first embodiment can be combined to the extent that they do not conflict with the fourth embodiment.

Control based on the product of the current value of the high-frequency current applied to the file 11 and the energization period in the dental treatment apparatus 10 will be explained using a flowchart. FIG. 12 is a flowchart for explaining control of the dental treatment apparatus according to the fourth embodiment. First, when the user determines the energization position of the high-frequency current based on the root canal length measurement circuit 23 and operates the foot switch 16 at the energization position, the control circuit 21 causes the high-frequency signal generation circuit 19 to transmit the high-frequency current to the file 11. A preliminary current is applied for one period (step S101).

Next, the control circuit 21 generates a high-frequency current that falls within a predetermined range based on the product of the current value detected by the detection unit 20 when the preliminary current is passed through the file 11 and its energization period (first period). The voltage value and energization period of the high frequency signal generation circuit 19 for energizing the file 11 with the current value of 1 are determined (step S102B). Specifically, in order to reduce inflammatory factors, bacteria, etc. in the root canal, it is necessary to apply a high frequency current with a current value within a predetermined range for a predetermined period of time. For example, by applying a high frequency current of 30 mA to the file 11 for 1 second, inflammatory factors, bacteria, etc. in the root canal can be reduced. Therefore, the control circuit 21 causes a preliminary current to flow through the file 11 for a first period, and reduces inflammatory factors, bacteria, etc. in the root canal based on the product of the current value that actually flows through the file 11 and the current application period. The voltage value and energization period of the high frequency signal generation circuit 19 are determined to ensure the current value of the high frequency current necessary for root canal treatment. Of course, the control circuit 21 generates a high-frequency signal for ensuring the current value of the high-frequency current to be energized to the file 11 based on the product of the current value detected by the detection unit 20 and the energization period by flowing the preliminary current to the file 11. Either the voltage value or the energization period of the generating circuit 19 may be determined. For example, the energization period is determined in advance as a specified period, and the control circuit 21 controls the high-frequency current to ensure the current value of the high-frequency current to be energized to the file 11 based on the product of the detected current value and the energization period. Only the voltage value of the signal generation circuit 19 is determined. The control circuit 21 calculates the impedance of the root canal from the current value detected by the detection unit 20 and the voltage value applied to the high-frequency signal generation circuit 19 at that time, and energizes the file 11 at the impedance of the root canal. The voltage value of the high frequency signal generation circuit 19 is determined to ensure the current value.

After the first period has elapsed, the control circuit 21 suspends power supply from the high frequency signal generation circuit 19 to the file 11 for a suspension period (step S103). The control circuit 21 increments the energization frequency counter by 1 in order to count the number of times the high-frequency current is energized during the second period (step S104). The control circuit 21 controls the high-frequency signal generating circuit 19 so that the high-frequency current is passed from the high-frequency signal generating circuit 19 to the file 11 at the voltage value of the high-frequency signal generating circuit 19 determined in step S102B and for a second period (step S105). ). The control circuit 21 causes a high frequency current to flow through the file 11 and determines whether the current value detected by the detection unit 20 is within a predetermined range (step S106).

If the detected current value is within a predetermined range (YES in step S106), the control circuit 21 determines whether the energization number counter is equal to or greater than N times (for example, 10 times) (step S107). . If the energization count counter is not N times or more (NO in step S107), the control circuit 21 returns the process to step S103 and repeats the control in the pause period and the second period. Note that, as described in the third embodiment, if the energization number counter is not equal to or greater than N times (NO in step S107), the control circuit 21 returns the process to step S101, and returns the process to the first period, the rest period, and the second period. The control may be repeated. On the other hand, if the energization number counter is N times or more (YES in step S107), the control circuit 21 resets the energization number counter to 0 (zero) (step S108), and sends the high-frequency current to the file 11. Stops the process of energizing. Although not shown, the control circuit 21 determines whether or not the bone regeneration mode is input through the setting operation unit 15 after the process in step S108 (step S10), and if the bone regeneration mode is input, Operation in bone regeneration mode may also be started.

Returning to step S106, if the detected current value is not within the predetermined range (NO in step S106), the control circuit 21 detects that the current value of the high-frequency current being energized is outside the predetermined range. The information is displayed on the display unit 14 (step S110).

Next, the control circuit 21 causes a high frequency current to flow through the file 11 and determines whether the current value detected by the detection unit 20 is smaller than the minimum current value within a predetermined range (step S111). If the detected current value is outside the predetermined range (NO in step S105) and smaller than the minimum current value within the predetermined range (YES in step S111), the control circuit 21 energizes the file 11 with high frequency current again. Information indicating that processing is required is displayed on the display unit 14 (step S112).

Further, the control circuit 21 measures the energization period in which the detected current value is smaller than the minimum current value within a predetermined range (step S113).

Returning to step S111, if the detected current value is outside the predetermined range (NO in step S105) and is not smaller than the minimum current value within the predetermined range (NO in step S111), the control circuit 21 detects the detected current value. Since it can be determined that the current value is larger than the maximum current value within the predetermined range, the process of applying high frequency current to the file 11 is stopped (step S115). The control circuit 21 displays information to the effect that the process of supplying high-frequency current to the file 11 has been stopped on the display unit 14 (step S116).

In this manner, in the dental treatment apparatus 10 according to the fourth embodiment, the control circuit 21 controls the control circuit 21 so that the product of the current value detected by the detection unit 20 and the period during which the high-frequency current is applied is equal to or greater than a predetermined value. The high-frequency signal generating circuit 19 controls at least one of the voltage value of the high-frequency signal generating circuit 19 to ensure the high-frequency current to be energized to the file 11 in the sterilization mode, and the period during which the high-frequency current is energized to the file 11. .

With this configuration, the dental treatment apparatus 10 according to the fourth embodiment can control the high-frequency power to be energized to the file 11 based on the product of the current value detected by the detection unit 20 and the energization period in the sterilization mode. Since at least one of the current value and the energization period is controlled by the high-frequency signal generation circuit 19, the current within a predetermined range can be maintained in the file 11 placed in the dental treatment area even in response to various changes in circumstances. A high frequency current of a certain value can be passed through. In addition, the dental treatment apparatus 10 similarly determines the current value of the high-frequency current to be energized to the file 11 and the energization period based on the product of the current value detected by the detection unit 20 and the energization period in the bone regeneration mode. At least one of the controls may be performed on the high frequency signal generation circuit 19.
(Modified example)
The dental treatment device has a file holder 13 to which the file 11 is attached, as described in the above embodiment, and is not limited to a configuration capable of measuring root canal length and passing high-frequency current, and can also be used as a treatment tool. It may be combined with a configuration in which the treatment tool is driven by a motor, a configuration in which the treatment tool is driven by ultrasonic waves, etc.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

10 dental treatment device, 11 file, 12 unit, 13 file holder, 14 display section, 15 setting operation section, 16 foot switch, 17 motor, 18 motor drive circuit, 19 high frequency signal generation circuit, 20 detection section, 21 control circuit , 22 passive electrode, 23 root canal length measurement circuit.

Claims (16)

A dental treatment device that applies high-frequency current to a dental treatment area,
a holding part that holds an electrode arranged so that high-frequency current can be passed from the root canal to the dental treatment area;
a power supply unit that supplies a high frequency current to the electrode;
a control unit capable of setting a plurality of output ranges for passing high-frequency current from the power supply unit to the electrode;
a detection unit that detects a current value applied to the electrode from the power supply unit,
The control unit sets at least a first output range and a second output range in which a high frequency current of 25 times or more is applied to the current value of the first output range,
energizing the electrode from the power supply unit with a preliminary current having a current value smaller than the current value within the second output range;
A dental treatment device, wherein the power supply unit controls a current value of a high-frequency current that is energized to the electrode based on a current value of the preliminary current detected by the detection unit. The control unit includes:
a first control mode in which a high frequency current having a current value within the first output range is passed through the electrode;
The dental treatment apparatus according to claim 1, wherein a second control mode in which a high frequency current having a current value within the second output range is applied to the electrode can be switched. The control unit includes:
Divide one energization period in which high-frequency current is applied to the electrode into multiple sections,
a first section in which a high frequency current having a current value within at least the first output range is energized through the electrode;
The dental treatment apparatus according to claim 1, wherein the energization period includes a second section in which the electrode is energized with a high-frequency current having a current value within the second output range. The control unit includes:
In the first control mode , the power supply unit controls the current value of the high-frequency current to be energized to the electrode so that the current value detected by the detection unit is within the first output range. conduct,
In the second control mode , the power supply unit controls the current value of the high-frequency current to be energized to the electrode so that the current value detected by the detection unit is within the second output range. The dental treatment device according to claim 2 , wherein the dental treatment device performs the treatment. The control unit includes:
In the first section, controlling the current value of a high-frequency current to be energized to the electrode with respect to the power supply unit so that the current value detected by the detection unit is within the first output range,
In the second section, the power supply unit controls the current value of a high-frequency current that is energized to the electrode so that the current value detected by the detection unit is within the second output range. The dental treatment device according to item 3 . The control unit includes:
2. The power supply unit according to claim 1, wherein the power supply unit controls a time period during which a high frequency current having a current value within the second output range is energized to the electrode based on the current value of the preliminary current detected by the detection unit. The dental treatment device described. When the detection unit detects a current value larger than the maximum current value in the second output range, the control unit performs control to prevent or stop the high-frequency current flowing to the electrode, or to control the current value to be energized. The dental treatment apparatus according to any one of claims 1 to 6 , wherein any one of the reduction controls is performed on the power supply unit. It further includes a notification unit that notifies the user of information,
The dental clinic according to claim 2 or 4, wherein the control unit causes the notification unit to notify whether the control is performed in the first control mode or the second control mode. treatment equipment. It further includes a notification unit that notifies the user of information,
The dental treatment according to claim 3 or 5, wherein the control section causes the notification section to notify whether the control is being performed in the first section or the second section. Device. When the current value detected by the detection unit is outside the second output range, the control unit transmits information to the effect that the current value of the high-frequency current being energized is outside the second output range. The dental treatment device according to claim 9 , wherein the notification section is made to notify. When the detection unit detects a current value larger than the maximum current value of the second output range and stops the high-frequency current from flowing from the power source to the electrode, the control unit stops the high-frequency current from flowing from the power supply to the electrode. The dental treatment apparatus according to claim 9 or 10 , wherein the notification section is made to notify the information that has been obtained. 10. The control section causes the notification section to notify information urging the high-frequency current to be energized again when the detection section detects a current value smaller than the minimum current value of the second output range . Or the dental treatment device according to claim 10 . Claims 9 to 12, wherein the control unit measures a time when the detection unit detects a current value smaller than the minimum current value of the second output range, and causes the notification unit to notify the measured time. The dental treatment device according to any one of the above. The dental treatment device according to any one of claims 1 to 13 , wherein the current value within the first output range is 1 mA or less. The control unit uses a high frequency current having a current value in the first output range to promote bone regeneration, and uses a high frequency current having a current value in the second output range to sterilize a root canal. The dental treatment device according to claim 14 . The dental treatment apparatus according to any one of claims 1 to 15 , wherein the plurality of output ranges to be set include at least an output range in which the current value of the high-frequency current is 1 mA or less.

Images