JP4252886B2 - Handpiece for removing root canal fracture devices - Google Patents

Description

The present invention relates to a root canal fracture device for removing the handpiece to be used to remove the fracture equipment remaining in the root canal during dental treatment.

  In root canal treatment, one of the dental treatments, the dead pulp and contaminated dentin inside the root canal are removed using a cleanser, and then the root canal is enlarged using a reamer or file to clean and disinfect. To be done. During the root canal treatment, if the above-described instruments such as the cleanser, reamer, and file are accidentally broken and remain in the root canal, it greatly affects whether or not the affected tooth can be stored. For this reason, the treatment which removes the broken equipment which remained in the root canal is performed.

Conventional removal of the broken device is performed by performing the following measures.
(1) Remove the broken device by gradually cutting it from the top.
(2) Using a small cutting bar, remove the fracture device by excising part of the fracture device or the root canal wall, sealer, and cement around it.
(3) After the tooth around the fractured device is excised with an ultrasonic tip, the instrument is vibrated to release the fractured device from the root canal wall, and then the tubular canceller reaches the fractured device. By inserting the upper part of the breaking device into the canceller, filling the canisteria with cyanoacrylate adhesive in this state, bonding the canceller and the breaking device, and pulling out the canceller Remove the fracture device from the root canal.
(4) As disclosed in Patent Documents 1 and 2, the pipe includes a small-diameter pipe in which an engagement bent portion or an engagement hole portion is formed at the distal end portion, and an operation portion on which the pipe is attached to be movable up and down. Remove the broken device using the removal tool. In this method, after inserting a pipe into the root canal and hooking the fracture device into the engagement bend or engagement hole of the tip, the screw of the operation section is rotated to pull up the pipe. It is to be extracted.
French Patent Invention No. 2042001 Specification French patent invention No. 1213369 specification

Each of the conventional treatments described above has the following problems.
In the case of (1), when the fracture device is made of a hard material such as stainless steel, it cannot be cut, and when it is a cleanser or reamer fracture device, it is pushed toward the root hole. Therefore, it has the inconvenience that cannot be deleted.
In the treatment (2), perforation is often caused outside the root canal, which is dangerous.
In the treatment of (3), it is difficult to bond the broken device with great difficulty. In addition, the adhesive flows out of the canseria and causes an accident that solidifies in the root canal. Furthermore, it is necessary to perform the treatment step by step, and it takes time and gives anxiety to the patient.
In the treatment (4), it is difficult to engage the broken device with the engagement bent portion or the engagement hole portion of the pipe tip portion. Moreover, since the engaging force with respect to a broken apparatus is weak and it is easy to remove | deviate, the extraction requires a long time and gives anxiety to a patient.

The present invention has been made in consideration of such conventional problems, and it is possible to reliably and quickly extract the fractured device remaining in the root canal by a simple operation. an object of the present invention is to provide a root canal fracture handpiece for equipment removal.

  In the root canal breaking device removal handpiece of the first aspect of the invention, the main body through which the fiber connected to the laser emitting device is inserted, the breaking device in the root canal, and the tip of the fiber can be inserted. A pipe having an inner diameter and detachably attached to the distal end side of the main body is provided.

  In the root canal breaking device removing handpiece according to the first aspect of the present invention, the broken device and the tip of the fiber are inserted into the pipe, the laser beam is supplied from the laser emitting device and irradiated from the fiber. And the fracture device are welded, and in this state, the pipe is pulled out from the root canal, and the fracture device is extracted together with the pipe.

  In such an invention, since the broken device can be firmly connected to the pipe, the broken device can be reliably extracted. Further, since laser irradiation is performed inside the pipe, laser light does not leak, there is no risk of erroneous irradiation, and welding can be performed in a short time. Therefore, not only is there no adverse effect on the tooth tissue, but it is possible to perform treatment in a short time with a simple operation.

  A second aspect of the present invention is the intra-root canal breaking device removing handpiece according to the first aspect, wherein the fiber is fed so that the tip of the fiber reaches a laser irradiable position with respect to the breaking device. Is provided in the main body.

  In the invention of claim 2, since the tip of the fiber can be sent to the laser irradiable position by the feeding mechanism, the laser irradiation from the fiber can be efficiently performed and the welding can be performed in a short time. it can.

  The invention according to claim 3 is the handpiece for removing a root canal breaking device according to claim 2, wherein the main body is formed by a first part through which the fiber can be inserted and a second part through which the fiber can be inserted and gripped. The feed mechanism is an adjustment nut that is attached to one of the first part or the second part and is screwed to the other, and relatively moves the first part and the second part by rotating operation. It is characterized by.

  In the invention of claim 3, by rotating the adjusting nut, the first part and the second part are relatively moved, and the fiber is moved by this relative movement. For this reason, the movement of the fiber can be easily performed. Further, since the movement is adjusted by the screw, simple and fine movement is possible, and the position of the fiber with respect to the pipe can be adjusted with high accuracy.

  The invention of claim 4 is the handpiece for removing a root canal breaking device according to any one of claims 1 to 3, wherein a tip that is detachable from the tip side of the main body can be attached to the main body. The pipe is integrally fixed to the tip.

  In the invention of claim 4, since the pipe is fixed to the tip, the pipe can be removed simply by removing the tip from the main body. For this reason, the pipe can be easily attached and detached. In addition, infection can be prevented because it can be discarded together with the tip and pipe after the broken device is removed.

  According to the handpiece for removing a broken device in the root canal of the present invention, the broken device can be firmly coupled to the pipe, so that the broken device can be reliably extracted, and the inside of the pipe Therefore, the laser beam does not leak out, there is no risk of erroneous irradiation, the welding can be performed in a short time, and the treatment for removing the broken device can be performed in a short time.

  1 to 3 show a root canal breaker removing handpiece (hereinafter, handpiece) 1 according to an embodiment of the present invention.

  The handpiece 1 includes a main body 2 extending in an axial shape in one direction, and a pipe 3 provided on the distal end side of the main body 2.

  The main body 2 is entirely formed of a corrosion-resistant metal such as stainless steel or aluminum alloy, and extends coaxially from the first part 4 on the front end side (left end side) and the base end side (right end side) of the first part 4. A second part 5 and a feed mechanism 6 for connecting the first part 4 and the second part 5 are provided. An insertion hole 8 through which the fiber 7 is inserted communicates with the first part 4 and the second part 5 in a penetrating manner. The fiber 7 is inserted into the insertion hole 8 from the base end side of the second part 5, passes through the inside of the second part 5, and then is inserted into the first part 4.

  The second part 5 is for inserting the fiber 7 and holding and fixing the inserted fiber 7. The second part 5 includes a gripping shaft portion 9 on the first part 4 side and a lock shaft portion 10 extending from the proximal end side of the gripping shaft portion 9. The gripping shaft portion 9 is connected to the part 4 by inserting the distal end side into the first part 4, thereby the entire second part 5 including the gripping shaft portion 9 and the lock shaft portion 10. Are coaxially connected to the first part 4.

  The proximal end side of the gripping shaft portion 9 is a thin gripping portion 9 a, and this gripping portion 9 a extends in the direction of the lock shaft portion 10 and is inserted into the coaxial portion 10. By being thin, the gripping portion 9a has elasticity capable of reducing the diameter. Further, a tapered portion 9b whose diameter gradually decreases toward the lock shaft portion 10 is formed on the outer surface of the grip portion 9a. On the other hand, on the inner surface of the insertion portion of the grip portion 9a in the lock shaft portion 10, a tapered pressing portion 10b corresponding to the inclination of the tapered portion 9b is formed.

  In such a structure, when the lock shaft portion 10 is fitted into the grip portion 9a of the grip shaft portion 9 while the fiber 7 is inserted, the pressing portion 10b presses the taper portion 9b to reduce the diameter of the grip portion 9a. The grip portion 9 a can grip the fiber 7. In order to easily reduce the diameter of the grip 9a, a slit (not shown) extending in the axial direction is formed in the grip 9a. Reference numeral 11 denotes a lock pin for locking the connected state of the grip shaft portion 9 and the lock shaft portion 10.

  The feed mechanism 6 is a mechanism that connects the first part 4 and the second part 5 so as to move relatively in the axial direction. The feed mechanism 6 is formed by a male screw 12 formed on the outer surface of the first part 4 in the insertion portion of the gripping shaft portion 9 and an adjustment nut 13 that is screwed into the male screw 12.

  The adjustment nut 13 is engaged with the coaxial portion 9 in a rotatable state by the base end portion (right end portion) biting into the outer surface of the gripping shaft portion 9. Accordingly, by rotating the adjustment nut 13 clockwise, for example, the first part 4 and the second part 5 including the gripping shaft portion 9 are relatively moved so as to be attracted and rotated counterclockwise. By operating, the 1st part 4 and the 2nd part 5 can move relatively so that it may be pulled apart. By this movement, the fiber 7 held by the second part 5 moves forward and backward in the axial direction inside the first part 4.

  A buffer spring 15 is disposed inside the first part 4. The buffer spring 15 is disposed so as to be positioned on the distal end side of the insertion part of the gripping shaft portion 9 in the first part 4, and both end portions thereof are the inner wall portion 4 a of the first part 4 and the distal end side of the gripping shaft portion 9. It is in contact with the washer 16 disposed on the surface. The buffer spring 15 absorbs play in the relative movement of the first part 4 and the second part 5, whereby the rotation operation to the adjustment nut 13 can be performed smoothly.

  The pipe 3 is detachably attached to the distal end side of the first part 4. In this embodiment, the pipe 3 is attached to the distal end side of the first part 4 via the distal tip 20.

  The tip 20 has a mounting cylinder 21 that is attached to the tip of the first part 4 by inserting the tip of the first part 4 (see FIG. 3). The pipe 3 is attached to the front end side of. The pipe 3 is integrated with the distal end tip 20 by inserting the base end portion of the pipe 3 into the mounting tube portion 21. For this reason, the attachment / detachment of the pipe 3 to / from the distal end side of the first part 4 is performed by attaching / detaching the distal tip 20 to / from the first part 4. When the pipe 3 is attached to the distal end side of the first part 4, the insertion hole 8 formed in the axial direction of the main body 2 and the pipe 3 are coaxially communicated with each other. The dimension and mounting position of the chip 20 are set as such.

  As such a pipe 3, a pipe 3 having an inner diameter into which a breaking device 30 in the root canal and a distal end portion 7 a of the fiber 7 can be inserted is used. Further, as the material of the pipe 3, a metal material having a large strength similar to that of the broken device 30 is used. That is, when stainless steel such as SUS304 or Ni—Ti alloy is used as the breaking device 30, the pipe 3 is formed of these metals. As will be described later, when the fracture device 30 is removed from the root canal of the tooth, a certain tensile force or more is required. By using the same metal as the fracture device 30, the strength against the fracture device removal is increased. This is because it can be applied to the pipe 3. In this case, the pipe 3 does not need to be the same metal material as that of the breaking device 30, and may be a different metal material as long as it has a certain strength. Therefore, for example, when the breaking device 30 is stainless steel, the pipe 3 may be stainless steel, Ni—Ti alloy, or other metal. In addition, as the pipe 3, having the flexibility which can be bent is suitable for the extraction operation of the breaking device 30, and in the case of the above-described metal material, by reducing the wall thickness, Can respond.

  When a metal material having the same strength as that of the breaking device 30 is used as the pipe 3, since these metals have a high melting point, the temperature becomes high at the time of welding with the breaking device 30 by laser irradiation. For example, the melting temperature of stainless steel is 1400 to 1420 ° C., the melting temperature of Ni—Ti alloy is 1250 to 1280 ° C., and laser irradiation requires a high temperature corresponding to these. However, since the laser for welding is irradiated from the fiber 7 inside the pipe 3 with the breaking device 30 inserted into the pipe 3, the laser energy is concentrated and the pipe 3 and the breaking device 30 are concentrated. Can act on. Moreover, since the weld between the pipe 3 and the breaking device 30 may be a locally narrow portion between the head of the breaking device 30 and the inner surface of the pipe 3, the welding between the pipe 3 and the breaking device 30 is performed. It can be completed in a very short time. In addition, the laser irradiation is inside the pipe 3 and the laser beam does not leak outside. As described above, there is no thermal influence on the outside, and it is possible to weld safely.

  In addition to the metal material similar to the breaking device 30, a metal material having a melting point lower than that of the metal of the breaking device 30 can be used as the pipe 3, for example, aluminum alloy, copper, silver, etc. Can be selected. Since the aluminum alloy melts at 650 to 670 ° C., copper melts at 1084.5 ° C., and silver melts at 961.93 ° C., it is possible to perform welding with the breaking device 30 with a small amount of heat. Therefore, there is an advantage that laser irradiation for performing fusion can be performed with a small energy and in a short time.

  The fiber 7 is inserted into the main body 2 in a state of being connected to the laser emitting device 25, and the tip portion thereof is inserted into the pipe 3. In this insertion state, the lock shaft 11 and the grip shaft 9 are connected and locked by the lock pin 11, so that the fiber 7 is gripped by the second part 5 and fixed to the second part 5 side. Become. In this state, by rotating the adjustment nut 13 of the feed mechanism 6 in the forward and reverse directions, the first part 4 and the second part 5 are relatively advanced and retracted in the axial direction as indicated by an arrow L in FIG. As a result, the fiber 7 can move forward and backward as indicated by an arrow M in and out of the pipe 3.

  Next, a method for removing the broken device 30 according to this embodiment will be described. The removal of the broken device 30 from the root canal is performed by irradiating the laser supplied from the laser emitting device 25 from the fiber 7 with the fiber 7 and the broken device 30 inserted into the pipe 3. The apparatus 30 is welded, and then the pipe 3 is pulled out from the root canal. As the laser emitting device 25, a YAG laser device using a neodymium (Nd) crystal can be used.

  4 and 5 show an adjustment procedure for the handpiece 1 performed before the broken device 30 is extracted. With the lock shaft portion 10 removed from the gripping shaft portion 9, the fiber 7 is inserted into the main body 2 from the proximal end side of the lock shaft portion 10, and the first part 4 and the distal tip 20 are passed through. After the distal end portion 7 a is slightly pulled out from the distal end of the pipe 3, the holding shaft portion 9 and the lock shaft portion 10 are connected and locked by the lock pin 11. As a result, the grip shaft 9, that is, the second part 5, grips the fiber 7 (see FIG. 4).

  Next, the adjustment nut 13 of the feed mechanism 6 is rotated to advance the first part 4 from the second part 5. As a result, the fiber 7 is slightly drawn so that the tip 7a is located inside the pipe 3, and the adjustment of the handpiece 1 is completed.

  6 to 11 show a procedure for extracting the fracture device 30 such as a reamer remaining in the root canal 40 of the tooth. As shown in FIG. 6, the fracture device 30 remains inside the root canal 40, and the handpiece 1 that has been adjusted as described above is operated to insert the pipe 3 into the root canal 40. Thereby, as shown in FIG. 7, the end of the broken device 30 is inserted into the pipe 3. At this time, adjustment according to the root canal 40 such as bending is facilitated by using a pipe 3 having flexibility.

  Thereafter, as shown in FIG. 8, the fiber 7 is advanced in the pipe 3, and the tip 7 a of the fiber 7 is brought into contact with the end of the broken device 30. In other words, the fiber 7 advances so that the tip end portion 7a thereof is at a position where laser irradiation can be performed on the breaking device 30. The advancement of the fiber 7 is performed by rotating the adjustment nut 13 of the feed mechanism 6. This contact can be reliably operated by confirming with a digital X-ray. Not limited to this, it is also possible to grasp the rotational speed of the adjusting nut 13 and the advancement amount of the fiber 7 and rotate the adjusting nut 13 a predetermined number of times.

  FIG. 9 shows a state in which laser irradiation is performed from the fiber 7. Laser irradiation is performed by supplying a laser from the laser emitting device 25, and the supplied laser is irradiated from the distal end portion 7 a of the fiber 7, and the pipe 3 and the fracture device 30 are welded by this irradiation. When the pipe 3 is made of stainless steel or a Ni—Ti alloy, for example, welding can be performed by performing the laser irradiation for about 1 second at an energy of 300 mJ and 10 pps. Reference numeral 33 in FIG. 9 indicates a welded portion between the pipe 3 and the breaking device 30.

  After the pipe 3 and the broken device 30 are welded by laser irradiation, the hand piece 1 is operated and the pipe 3 is pulled out from the root canal 40 as shown in FIG. At this time, since the broken device 30 is welded to the pipe 3, the broken device 30 is pulled out from the root canal 40 together with the pipe 3 and extracted. In this extraction, it may be performed as it is or vibration may be applied. By applying vibration, the extraction can be performed more reliably.

  Thereafter, the tip 20 is removed from the main body 2 of the handpiece 1 and the tip 7a of the fiber 7 is separated from the subsequent portion. As a result, as shown in FIG. 11, the tip 20, the pipe 3, and the breaking device 30 are separated from the handpiece 1, and these are discarded together. When discarding the tip tip 20, the pipe 3 and the broken device 30 together, the tip can be disposed without touching the broken device 30 extracted from the root canal 40, so that there is no risk of infection or the like.

  In this embodiment, since the fracture device 30 and the pipe 3 are coupled by welding by laser irradiation, they can be firmly coupled, and the fracture device 30 can be reliably extracted.

  Further, since the laser irradiation is performed inside the pipe 3, the laser beam does not leak, there is no risk of erroneous irradiation, and the laser energy can be concentrated so that the welding can be performed in a short time. It becomes possible. For this reason, there is no adverse effect due to heat or the like on the surrounding tooth tissue, and a safe operation can be performed.

  Furthermore, since the pipe 3 can be inserted into the root canal 40, welded by laser irradiation, and the broken device 30 integrated with the pipe 3 can be pulled out continuously, treatment in a short time becomes possible. The pain to the patient can be reduced.

  FIG. 12 shows a reference example of the insertion amount of the pipe 3 into the broken device 30. When the broken device 30 is folded in a horizontal state as shown in (a), the pipe 3 is inserted to a depth of 1 to 2 mm with reference to the horizontal cut surface 34.

  When the broken device 30 is a reamer, the broken device 30 has a spiral shape and is easily broken obliquely. When the breaking device 30 is bent obliquely in this way, as shown in FIG. 5B, the lower part of the oblique cut surface 34 is used as a reference surface, and the pipe 3 is inserted to a depth of 1 to 2 mm from this reference surface. To do. By inserting to such a depth, the laser does not leak out of the pipe 3, and the fracture device 30 can be welded reliably.

  In addition, when the fracture apparatus 30 is embedded in the root canal 40 and is not exposed, the crown down method used for dental treatment can be applied. That is, the crown side is expanded by high-speed cutting, the root canal upper part is expanded by a Gates gridden drill, and the root canal lower part where the fracture device 30 remains is opened and exposed by a manual cutting instrument. . Thereafter, the broken device 30 is extracted by the procedure described above.

  The present invention can be variously modified without being limited to the above embodiments. For example, the pipe 3 may be attached to the tip of the main body 2 without using the tip 20. Further, as the feed mechanism 6, a mechanism other than a cylinder or other adjustment nut 13 can be used. Furthermore, the adjustment nut 13 may be attached to the first part 4 side and reversely screwed into the second part 5.

  In this example, 10 healthy human extracted maxillary central incisors were used as specimens. The central incisor was expanded and expanded so that the root canal was 6 mm from the root apex and the root canal width from the crown side was 0.7 mm after opening the ventricles. A No. 20 stainless steel K-FILE (hereinafter referred to as KF) cut at 8 mm from the tip was inserted into the root canal, and the tip was made to coincide with the apex to obtain a fracture device. Thereafter, agar was poured into the cube and cured at room temperature.

(Temperature rise test)
A thermocouple temperature sensor was made to reach the root canal surface of 1 mm (point a) and 7 mm (point b) from the apex to the crown side. A pipe made of stainless steel (SUS304) (hereinafter referred to as End-Eze Tips) is inserted into the root canal, and a fiber of an Nd: YAG laser device is inserted into the root canal, and then the output is set to 300 mJ / 10 pps / 3 W for 1 second. Irradiated. And the maximum temperature after laser irradiation in each measurement point was measured.

  As a result, the temperature rise at the point a was 0.15 ° C. to 0.6 ° C., and the average was 0.15 ° C. The temperature rise at point b was 1.36 ° C. on average at a minimum of 0.6 ° C. to a maximum of 4.1 ° C. As a result, the temperature change of the root surface due to laser irradiation was small at any measurement point, and there was almost no harmful effect on the periphery of the root.

(Pullout strength test)
As samples, 20 QT and 30 KF were prepared by cutting QUANTEC, SERIES 2000 (hereinafter, QT) made of Ni-Ti alloy No. 20 and KF at a position 8 mm from the tip. 2 mm of each file cutting part was inserted into the tip part of End-Eze Tips, and the fiber was inserted into Tip from the opposite side so as to contact the file. Then, the output was set to 300 mJ / 10 pps / 3 W and 400 mJ / 10 pps / 4 W for each group, and 10 each was irradiated for 1 second. As a comparative example, 10 pieces of KF bonded with cyanoacrylate were prepared, and the tensile strength was measured with a tensile tester (trade name: HANDY FORCE GAUGE).

  As a result, in the laser irradiation group, KF was significantly higher than QT. Further, when compared with the output of the laser device, the higher output of both QT and KF showed a significantly higher value. The maximum pullout strength of QT and KF occurred at 400 mJ / 10 pps / 4 W, with QT of 47.6 N and KF of 38.2 M. The cyanoacrylate group as a comparative example was substantially the same value as the 300 mJ / 10 pps / 3W group in KF. Thereby, it turned out that sufficient welding intensity | strength for extracting a broken apparatus from a root canal is acquired.

(SEM observation of welds)
Welding by laser irradiation was performed, and the welded portion of the sample after the pull-out strength test measurement was observed with a scanning electron microscope (SEM).

  As a result, bubble-like structures that were thought to have occurred after the metal surface melted and when it re-consolidated were observed at the site where the laser seemed to act directly. Thereby, it turned out that the welding by laser irradiation is made | formed reliably.

  Table 1 shows the effectiveness in the case where a pipe (End-Eze Tips) made of stainless steel (SUS304) is welded to a broken device by laser irradiation. As a breaking device, a SUS No. 20 reamer and a Ni-Ti alloy type No. 20 reamer were used, and these were cut at a position 8 mm from the tip, and a cork plate having a thickness of 20 mm so that the cut end was exposed 2 mm. Buried in. Pipes were inserted into these broken devices, laser welding was performed from the fiber, welding was performed, and then the pullout strength was measured using the same tensile tester as in Example 1.

  In Example A, a SUS reamer was irradiated with a laser at an output of 300 mJ / 10 pps / 3 W for 1 second. In Example B, a SUS reamer was lasered at an output of 400 mJ / 10 pps / 4 W for 1 second. Example C was irradiated with a laser at an output of 300 mJ / 10 pps / 3 W for 1 second, and Example D was 400 mJ for a Ni-Ti reamer. The laser irradiation was performed for 1 second at an output of / 10 pps / 4 W, and Comparative Example E was a SUS reamer bonded with a cyanoacrylate adhesive.

  As shown in Table 1, the tensile load was 0.5 N or more, and it was able to sufficiently withstand the drawing. Further, it was confirmed that the laser irradiation output performed for 1 second at 400 mJ / 10 pps / 4 W had a stronger welding force than Comparative Example E. Further, Examples A and B have a larger tensile load than Examples C and D. This is because the reamers of Examples A and B are made of the same quality stainless steel as the pipe (End-Eze Tips), and in laser irradiation, the reamer is melted simultaneously with the pipe and welded to the pipe. Therefore, when a large tensile force is required when removing the breaking device, it is preferable to use a pipe made of the same metal material as the breaking device or a metal material having the same melting point as the breaking device. I know that there is.

It is sectional drawing of the handpiece in one Embodiment of this invention. It is sectional drawing which shows the action | operation of a handpiece and the action | operation of a fiber. It is sectional drawing of a tip. It is sectional drawing which shows adjustment of the handpiece before breaking instrument extraction. It is sectional drawing which shows adjustment of the handpiece before breaking instrument extraction. It is sectional drawing which shows the broken apparatus in a root canal. It is sectional drawing which shows the state which inserted the pipe in the root canal. It is sectional drawing which shows the state which moves a fiber within a root canal. It is sectional drawing which shows welding by laser irradiation. It is sectional drawing which shows extraction of the broken apparatus from a root canal. It is sectional drawing which shows the state which pulled out the broken apparatus from the root canal. It is sectional drawing which shows the insertion amount of the pipe with respect to a fracture apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Handpiece 2 Main body 3 Pipe 4 1st part 5 2nd part 6 Feeding mechanism 7 Fiber 7a Fiber tip 13 Adjustment nut 20 Tip tip 25 Laser emitting device 30 Breaking device 40 Root canal

Claims (4)

  It has a main body through which a fiber connected to the laser emitting device is inserted, a fracture device in the root canal, and an inner diameter into which the distal end of the fiber can be inserted, and is detachably attached to the distal end side of the main body. A handpiece for removing broken root canal equipment, characterized by comprising a pipe.   The root canal breakage device removing device according to claim 1, wherein a feed mechanism for feeding the fiber so that a tip end portion of the fiber reaches a laser irradiable position with respect to the breakage device is provided in the main body. Hand piece.   The main body is formed by a first part through which the fiber can be inserted and a second part through which the fiber can be inserted and gripped, and the feed mechanism is attached to one of the first part or the second part and screwed to the other. The root canal breaking device removing handpiece according to claim 2, wherein the handpiece is an adjustment nut that relatively moves the first part and the second part by a rotating operation.   The tip part which can be attached or detached with respect to the front end side of a main body can be mounted | worn with a main body, The said pipe is being integrally fixed to the tip part, The Claim 1 characterized by the above-mentioned. Handpiece for removing broken root canal equipment.

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