JP6925613B2 - Partial denture design support device and partial denture design support program - Google Patents

Description

The present invention relates to a removable partial denture design support device and a partial denture design support program that assist a dentist in designing a removable partial denture that supplements a missing tooth.

The ones described in Patent Documents 1 and 2 are known as those that capture 3D (three-dimensional) data obtained by scanning the state in the oral cavity when producing a denture and allow a computer to support the design. There is.

The "method of constructing and designing a set of teeth" described in Patent Document 1 is applied to a virtual three-dimensional display of the patient's current oral condition to acquire the first set of teeth and obtain the first set. One or more parameters of one or more teeth in a tooth are optionally modified to obtain the final set of teeth. This parameter includes the curvature of the tooth defined by the relative position of the tooth, the rotation of the tooth with respect to the midline of the face, the geometric shape of the central tooth, the shape / size of the tooth, and the like.

Further, the "method of modeling and manufacturing a denture" described in Patent Document 2 is a stage of virtually modeling a denture by scanning the oral cavity of a patient in 3D, and acquiring a virtual tooth to express an artificial tooth. A stage, a stage of virtually modeling a virtual tooth to obtain a set of modeled virtual teeth, a stage of manufacturing a modeled virtual tooth and a gingival part, and a computer-assisted denture. It includes a stage of manufacturing by a manufacturing method (CAM).

Japanese Patent Application Laid-Open No. 2015-591461 Special Table 2015-540515

However, in the conventional design of the denture described in Patent Documents 1 and 2, since the dentist or the dental technician operates the CAD to create the denture, the knowledge of the dentist or the dental technician is used. I have to rely on experience. Therefore, depending on the creator such as a dentist or a dental technician, the design of the denture may be different even if the defective part is the same. Furthermore, since there are many factors that determine the shape of removable partial dentures, there is a risk that the patient may feel uncomfortable or uncomfortable due to lack of experience or knowledge.

Therefore, the present invention provides a partial denture design support device and a partial denture design support program that can easily design a removable partial denture suitable for the condition of the patient's oral cavity without sufficient knowledge and experience. The purpose.

The removable partial denture design support device of the present invention includes a missing tooth setting means for inputting the position of the missing tooth and a basic design means for generating a plurality of candidates for the partial denture based on the position of the missing tooth. It is characterized by that.
Further, the removable partial denture design support program of the present invention uses a computer as a means for setting a missing tooth for inputting the position of the missing tooth, and a basic design for generating a plurality of candidates for the removable partial denture based on the position of the missing tooth. It is intended to operate as a means.

According to the present invention, simply by inputting the position of the missing tooth into the missing tooth setting means, the basic design means presents some ideal partial denture candidates from the position of the missing tooth, so that the patient's oral cavity Removable partial dentures that match the condition can be easily designed.

The basic design means is a rest of the occlusal surface of the abutment tooth among the abutment tooth candidates selected from the one having the lowest discomfort point calculated based on the number of abutment teeth based on the missing tooth. It is possible to generate a plurality of candidates from the abutment tooth candidates having a large area surrounded by the abutment tooth interval line connecting the positions.
When determining an abutment tooth candidate based on a missing tooth, the basic design means may select a candidate having a large area surrounded by an abutment tooth interval line connecting the positions of rests on the occlusal surface of the abutment tooth. desirable. However, in that case, all the remaining teeth are determined to be the abutment teeth. As the number of abutment teeth increases, the patient's discomfort increases. Therefore, the discomfort point indicating discomfort is increased based on the increase in the number of abutment teeth, and the calculation is performed based on the number of abutment teeth. By selecting the abutment tooth candidate from the one with the lowest discomfort point, a stable partial denture can be selected while suppressing discomfort to the patient.

By adding the numerical value indicating the deteriorated state of the abutment tooth to the discomfort point, the basic design means can exclude the tooth whose health condition has deteriorated from the candidates for the abutment tooth.

The basic design means can select a candidate having a high chewing point calculated based on the number of rests based on the missing tooth from the plurality of candidates. When the basic design means determines the number of rests based on the missing tooth, the stability of the removable partial denture can be taken into consideration by selecting the one having a high mastication point.

Based on the position of the missing tooth, the basic design means can search for a candidate from the actual data which is the manufacturing history of the partial denture, and provide the partial denture with the most usage examples as a candidate. By searching for candidates from actual data based on the position of the missing tooth, it is possible to design from the candidate with the most usage examples based on the past partial denture in which the missing tooth was at the same position.

The basic design means can select a candidate having a high clasp point scored based on the position of the missing tooth and the type of clasp from the plurality of candidates. Since it is possible to select a candidate with a high clasp point scored based on the position of the missing tooth and the type of clasp, a candidate with high functionality and aesthetics such as stability of the removable partial denture should be selected. Can be done.

According to the present invention, since some candidates for the ideal partial denture are presented from the position of the missing tooth, the removable partial denture suitable for the condition in the oral cavity of the patient can be easily designed.

It is a figure which shows the partial denture design support system which concerns on embodiment of this invention. It is a block diagram of the partial denture design support device of the partial denture design support system shown in FIG. It is a figure which shows the number or the alphabet character which specifies a missing tooth. It is a figure which shows an example of the actual data which is the manufacturing history of the removable partial denture. It is a block diagram of the terminal device for dental technicians of the partial denture design support system shown in FIG. It is a flowchart for demonstrating the operation of the partial denture design support apparatus shown in FIG. 2, (A) is a figure for demonstrating the first basic design of a partial denture, and (B) is It is a figure for demonstrating the basic design of 2. It is a figure for demonstrating the line between abutment teeth when designing the position of abutment tooth. It is a list for explaining an unpleasant point. It is a list for explaining the mastication point. It is a list for explaining the clasp functional evaluation point and the clasp aesthetic evaluation point. It is a figure of an example of the candidate of the partial denture designed by the removable partial denture design support apparatus shown in FIG. It is a flowchart for demonstrating the production of the removable partial denture. It is a figure for demonstrating that the partial denture data is corrected, (A) is the figure which shows the partial denture before change, (B) is a figure which shows the partial denture after change, (C) is (C). It is a perspective view of the state which B) is displayed in 3D. It is a figure which shows the state which superposed the model and the removable partial denture data.

A partial denture design support system using the removable partial denture design support device according to the embodiment of the present invention will be described with reference to the drawings.
In the partial denture design support system shown in FIG. 1, a partial denture design support device 10 which is a computer operated by a dentist is installed in a dental clinic. For example, a 3D (three-dimensional) scanner device 110 can be connected to the removable partial denture design support device 10. Further, an external memory 120 can be connected to the removable partial denture design support device 10.
At the dental laboratory, a terminal device 20 for a dental technician, which is a computer operated by a dental technician, is installed. An NC device 130 is connected to the dental technician terminal device 20.

The removable partial denture design support device 10 and the dental technician terminal device 20 are connected to the Internet W, which is an example of a telecommunication line, via relay devices 140 and 150, respectively.
The removable partial denture design support device 10 can be, for example, a tablet terminal device. The removable partial denture design support device 10 is communicably connected to the relay device 140 by Bluetooth (registered trademark) or WIFI (registered trademark). Further, the removable partial denture design support device 10 is connected to the external memory 120 by wireless communication or wired communication. The external memory 120 is a storage device that can store a large amount of information such as a hard disk drive and a flash memory. In FIG. 1, the external memory 120 is installed in the dental clinic, but an online storage service on the cloud may be used.

The removable partial denture design support device 10 can propose the optimum partial denture to the patient according to the missing tooth. The removable partial denture design support device 10 is a computer operated by a partial denture design support program to function.
As shown in FIG. 2, the removable partial denture design support device 10 includes a communication means 11, a missing tooth setting means 12, a basic design means 13, a correction means 14, a display means 15, an input means 16, and an external surface. The device connecting means 17 and the storage means 18 are provided.

The communication means 11 is connected to the Internet W and transmits / receives data. The communication means 11 can be a LAN. When the removable partial denture design support device 10 is used as a tablet terminal device, the communication means 11 is a wireless communication means.
The missing tooth setting means 12 is for inputting the position of the missing tooth. In the missing tooth setting means 12, the missing tooth is input by a number or an alphabet.
For example, as shown in FIG. 3, when the designation of the missing tooth is "Universal system", if it is a permanent tooth, it is designated by a number from 1 to 32. If it is a milk tooth, it is designated by the alphabet from A to T. In this way, in addition to the designation of the missing tooth as "Universal system", the FDI method or "Zsigmondy & Palmer system" can be used.
The number of missing teeth is input to the missing tooth setting means 12. For example, when the second molar and the first molar on the upper right are missing, a few are input.

The basic design means 13 has a function of performing a basic design for generating a plurality of candidates for removable partial dentures based on the positions of the missing teeth input to the missing tooth setting means 12.
The basic design means 13 includes a denture base design means 131, an abutment tooth or the like selection means 132, a clasp selection means 133, and a database search means 134.

The denture base design means 131 has a function of designing a denture base according to a missing tooth.
The abutment tooth selection means 132 is largely connected to the position of the abutment tooth and the position of the rest so that the range surrounded by the line between the abutment teeth connecting the positions of the rests on the occlusal surface of the abutment teeth becomes large. It has a function to select a child.
The clasp selection means 133 selects the type of clasp based on the combination of the missing teeth, the case where the missing tooth is the anterior tooth portion, the case where the missing tooth is the molar portion, and the like.
The database search means 134 has a function of searching the actual data, which is the production history of the removable partial denture, accumulated in the storage means 18 based on the input position of the missing tooth.

The correction means 14 has a function of changing the configuration of the removable partial denture basically designed by the basic design means 13.
The display means 15 can be an LCD or an organic EL panel. The input means 16 can be a keyboard or a mouse.

The external device connecting means 17 can read or write data by connecting the external memory 120, for example. Further, the external device connecting means 17 can connect peripheral devices such as a scanner and a printer to capture scan data and print print data. The external device connecting means 17 can be USB if it is a wired communication. Further, if it is wireless communication, it can be BLUETOOTH or WIFI. If the external device connecting means 17 communicates wirelessly, the communication means 11 may also serve as the function of the external device connecting means 17.

The storage means 18 can be a non-volatile memory such as a flash memory, a battery backup memory, or a hard disk drive device.
The storage means 18 stores the program and the data used by the program.
The data can be 3D data of each part constituting the removable partial denture.
Further, the storage means 18 stores the partial denture data indicating the partial denture basically designed by the basic design means 13. Further, the storage means 18 stores actual data which is 3D data of the removable partial denture produced so far.

As shown in FIG. 4, the actual data includes age information indicating age, gender information indicating gender, missing tooth information indicating missing teeth, abutment tooth information indicating abutment teeth, and abutment teeth on which rests are formed. Tooth information indicating the position, rest position information indicating mesial side or distal side, type information indicating the type of clasp, clasp position information indicating the position of the abutment tooth to which the clasp is locked, and the appearance of the removable partial denture. It is composed of a prosthetic tooth model constructed in 3D.

For example, in the gender information, "1" can be male and "2" can be female. For the rest position information, "m" can be mesial and "d" can be centrifugal. As for the clasp type information, a number can be associated with the clasp type such as "1" for an acre clasp, "2" for a wire, and "3" for a double acre clasp.

The dental technician terminal device 20 shown in FIGS. 1 and 5 stores a communication means 21, a correction means 22, a database search means 23, a display means 24, an input means 25, an external device connecting means 26, and a storage. It is equipped with means 27.
The communication means 21 is connected to the Internet W and transmits / receives data. The communication means 21 can be a LAN, similarly to the communication means 11 (see FIG. 2) of the removable partial denture design support device 10. When the communication means 21 is a LAN, the NC device 130 is connected to the communication means 21 via the relay device 150.

The correction means 22 has a function of correcting the partial denture data from the partial denture design support device 10 by a CAD operation.
The database search means 23 has a function of searching the actual data, which is the production history of the removable partial denture, accumulated in the storage means 27, based on the input position of the missing tooth.
The display means 24 may be an LCD or an organic EL panel. The input means 25 can be a keyboard or a mouse.

The external device connecting means 26 can, for example, connect an external memory to read or write data. Further, the external device connecting means 26 can print various data by connecting a peripheral device such as a printer.

The storage means 27 is a non-volatile memory such as a flash memory, a battery backup memory, or a hard disk drive device, similarly to the storage means 18 (see FIG. 2) of the removable partial denture design support device 10. Can be done.
The storage means 27 stores a program and data used by the program. In addition, actual data is also stored in the storage means 27.

The operation and usage state of the removable partial denture design support device 10 according to the embodiment of the present invention configured as described above will be described with reference to the drawings.

First, the first basic design of the removable partial denture will be described with reference to FIG. 6 (A).
The dentist inputs the position of the missing tooth of the patient into the removable partial denture design support device 10 (step S110).
When inputting a missing tooth, it may be input directly, it may be input by a dentition diagram, a photograph, a model scan, or it may be automatically input by an X-ray photograph or CT image data.

When the position of the missing tooth is directly input, the missing tooth input by the dentist by operating the input means 16 based on the setting screen displayed on the display means 15 by the missing tooth setting means 12 is used as the missing tooth information. It is set in the storage means 18 by the tooth setting means 12.

When inputting by the dentition diagram, the dentition diagram is scanned by a scanner connected to the external device connecting means 17, and the missing tooth setting means 12 indicates the position of the missing tooth described in the dentition diagram. The mark is read and the position where the mark is given is set as missing tooth information.

When inputting by a photograph, a photograph taken in the oral cavity is taken from an external memory connected to the external device connecting means 17, and the missing tooth setting means 12 determines the position of the missing tooth from this photograph by image processing. Then, it is set as missing tooth information.

When inputting by model scanning, the model created by taking an impression from the patient is scanned by a 3D scanner connected to the external device connecting means 17, and the missing tooth setting means 12 uses the 3D data of the model. The position of the missing tooth is read by image processing, and the position where the tooth is missing is set as the missing tooth information.

When inputting by X-ray photograph or CT image data, the X-ray photograph or CT image data is taken in from the external memory connected to the external device connecting means 17, and the defective tooth setting means 12 takes the X-ray photograph or CT. The position of the missing tooth is determined from the image data by image processing and set as the missing tooth information.

When the missing tooth information is set in this way, first, the denture base design means 131 of the basic design means 13 designs the denture base according to the position of the missing tooth (step S120).

Next, the abutment tooth or the like selection means 132 determines a candidate for the position of the abutment tooth, the position of the rest, and the large connector (step S130).
The abutment tooth or the like selection means 132 selects the abutment tooth so that the range surrounded by the abutment tooth interval line becomes large. For example, in the abutment tooth selection means 132, when the missing teeth are “30” and “31”, the abutment tooth candidate a is set to “28, 29, 19” as shown in FIG. 7 (A). Alternatively, candidate b is set to "29,19,18" as shown in Fig. (B), and candidate c is set to "28,29,19,18" as shown in Fig. (C). Further, the position of the rest is set to the distal side or the mesial side, and the abutment interdental line L is drawn for each candidate, and the areas of the regions S1, S2, and S3 surrounded by the abutment interdental line L are defined. Calculate.

At this time, the abutment tooth or the like selection means 132 calculates the discomfort point based on the number of abutment teeth, the number of teeth in the form of rest only, and the number of large connector or small connector.
As the number of abutment teeth increases, the denture becomes more stable but more uncomfortable. In addition, the large connector and the small connector are foreign substances in the oral cavity. Therefore, as the number of large connector and small connector increases, the discomfort increases, and as the surface area of the large connector increases, the discomfort increases. Therefore, the abutment tooth selection means 132 has a minus point. Increases the discomfort points that are.
By adding the discomfort points in this way, the discomfort points can be set as points indicating discomfort when the patient wears the removable partial denture, if the discomfort points are high.

For example, as shown in FIG. 8, the unpleasant points may be "the number of hook teeth", "the number of teeth only for the rest", "the number of large connector" and "the number of small connector" as basic points. can. As an additional point, "denture weight" can be used.
Further, for each unpleasant point, points can be set stepwise according to the number and contents thereof.

For example, as a basic point, the "number of hook teeth" is set to 3 levels of 1 point for 1 to 2 teeth, 2 points for 3 to 4 teeth, and 4 points for 5 or more teeth. .. The "number of teeth only for the rest" is set in three stages of 1 point for 1 to 2 teeth, 2 points for 3 to 4 teeth, and 4 points for 5 or more teeth. Two points are set for the "number of large connector" when there is one or more points.

In addition, as additional points, 2 points are set when the denture is "resin only", 3 points when "framework is used", and 4 points when "metal floor is used together". When using a large connector, points are set according to the type of large connector.
Further, in the case of a special artificial tooth, points are set according to the weight (specific gravity) based on the type of metal or resin forming the artificial tooth.
Regarding "small connector addition", the small connector originally refers to "the metal part that connects the clasp, rest, etc. to the denture base or the large connector", but here, the feeling of foreign matter is greater and the weight is also greater. It refers only to the part of a certain rest alone.

Further, the abutment tooth selection means 132 displays the position of the abutment tooth candidate on the display means 15, so that the dentist can see and input the tooth health condition of the patient who is the abutment tooth candidate. By operating the means 16, the health condition of the abutment tooth can be input numerically.
The numerical value of the health state expresses the deteriorating state indicating that the abutment tooth has a large degree of agitation depending on the health state as an unpleasant point.
The abutment tooth or the like selection means 132 adds discomfort points according to the health condition of the abutment tooth. By doing so, teeth with poor health can be excluded from candidates for abutment teeth. The discomfort point can also be changed depending on the tooth type of the abutment tooth.

The abutment tooth or the like selection means 132 uses the sum (minus addition) of these basic points and additional points as unpleasant points.

Further, the abutment tooth selection means 132 calculates the mastication point based on the number of rests and the total area of the denture base and the large connector in contact with the mucous membrane. As the number of rests and the total area of the denture base and the large connector in contact with the mucous membrane increase, the stability and efficiency during mastication improve. increase.
For example, as shown in FIG. 9, as a basic point, the mastication point is 1 point when the "total number of rest points" is 2, 2 points when the "total number of rest points" is 3 to 4, and 3 points when the "total number of rest points" is 5. When there are 6 points, it is set to 4 points. When the "number of large connector" is 0 to 1, it is set to 1 point, and when it is 2 or more, it is set to 2 points. Further, as an additional point, the "type of artificial tooth" is set according to the type of artificial tooth. Further, the "number of adjacent surface plates" is set to 1 point when the number is 1 to 3 and 2 points when the number is 4 or more.

In addition, in this embodiment, since the anatomical morphology of each patient is not yet taken into consideration, if the missing teeth are the same, the area in contact with the mucous membrane by the denture base and the large connector is constant, so the calculation is performed. For convenience, the chewing point is calculated using only the number of large connector.
By adding the mastication points in this way and calculating the total, the mastication point can be a point indicating stability and efficiency at the time of mastication if it is high.
In addition, mastication points can be added or subtracted depending on the health condition of the abutment tooth and the tooth type.

The abutment tooth or the like selection means 132 selects a hook tooth candidate having a large area from the abutment tooth candidates selected from the one having the lowest discomfort point, and further, among the abutment tooth candidates, among the abutment tooth candidates. Determine a predetermined number of abutment tooth candidates (combination of abutment teeth) with high mastication points.
As the abutment tooth candidate, a predetermined number is selected when selecting from the lowest candidate, but at least two or more candidates, for example, three candidates or five candidates, can be selected.
In this way, the positions of the hook teeth and the rest, and the candidates for the large connector are determined. Therefore, if the area surrounded by the abutment tooth line is simply calculated to determine the abutment tooth, all the remaining teeth will be used as the abutment tooth, but the discomfort point and the mastication point should be added. Then, the appropriate abutment tooth can be selected.

Next, the clasp selection means 133 selects the type of clasp. For example, the clasp selection means 133 scores the clasp's own sustainability, functionality considering the degree of attachment / detachment, and aesthetics based on the clasp candidates, and uses the total as the clasp evaluation point based on the clasp evaluation point. The one with the highest score is automatically selected.

Evaluation points based on functionality (clasp functional evaluation points) can be added as shown in FIG. 10 (A).
For example, if the missing tooth is a missing intermediate tooth and the acre clasp is applied, the score is +1. If the hook tooth is an isolated posterior molar, the ring clasp gives +1 point.

Further, the evaluation points based on aesthetics (clasp aesthetic evaluation points) can be added as shown in FIG. 10 (B).
For example, if the missing tooth is the anterior tooth, the wire type is applied to give +1 point. If the missing tooth is a molar, the wire type or cast type will give +1 point.

The clasp selection means 133 selects the type of clasp based on the combination of the missing teeth, the case where the missing teeth are the anterior teeth, the case where the missing teeth are the molars, and the like, and makes them candidates.

When each part of the removable partial denture is selected in this way and a candidate combining them is extracted from the total of discomfort points, mastication points, and clasp evaluation points, the basic design means 13 provides each candidate for the removable partial denture. The removable partial denture data, which is the CAD data in 3D indicating the above, is displayed on the display means 15 (step S140).
An example of each candidate is shown in FIG.

In the example shown in FIG. 11, when the missing tooth of the patient is "30, 31", as the first candidate, the removable partial denture A has a clasp C11 from the denture base B1 and a clasp C12 from the large connector M1. Candidates for dentures to be hung are "29,19", and the positions of rests R11 to R13 are the distal side of "29", the mesial side of "28", and the mesial side of "19", and the type of clasp is , "Acres clasp" (clasp C11) with abutment tooth "29" as a denture, and "Acres clasp" (clasp C12) with abutment tooth "19" as a denture are displayed. (See No. 2 shown in FIG. 4).

As a second candidate, the removable partial denture B has "29,18,19" as a candidate for a hook tooth on which the clasp C21 from the denture base B2 and the clasp C22 from the large connector M2 are hung, and the rests R21 to R23. The position is the centrifugal side of "29", the centrifugal side of "19", and the mesial side of "18", and the type of clasp is "Aker scrub" (clasp C21) with the abutment tooth "29" as a hook tooth. ) And "Double Acres Clasp" (clasp C22) with abutment teeth "18" and "19" as hook teeth (see No. 3 shown in FIG. 4).

Further, as for the removable partial denture C as the third candidate, the candidate for the hook tooth on which the clasp C31 from the prosthesis bed B3 and the clasp C32 from the large connector M3 are hung is "29, 19, 18", and the rests R31 to R34. The position is the distal side of "29", the mesial side of "28", the distal side of "19" and the mesial side of "18", and the type of clasp is that the abutment tooth "29" is a hook tooth. The "acres clasp" (clasp C31) and the "double acres clasp" (clasp C32) with the abutment teeth "18" and "19" as the hook teeth are displayed (No. shown in FIG. 4). See .4).

In the example shown in FIG. 11, each candidate of the removable partial denture based on the removable partial denture data which is CAD data is drawn in a flat 2D (two-dimensional), but in a standard 3D tooth pattern model, 3D. Candidates for removable partial denture may be three-dimensionally overlapped and drawn.

So far, the first basic design of the removable partial denture has been described, in which candidates for the basic design of the removable partial denture are generated by calculation by the denture base design means 131, the abutment tooth selection means 132, and the clasp selection means 133. Next, in parallel with or in series with the first basic design of the removable partial denture, the candidate of the basic design is generated by the database search means 134 based on the actual data. The basic design will be described with reference to FIG. 6 (B).

The database search means 134 searches for the actual data of the storage means 18 based on the position of the missing tooth set in step S110 shown in FIG. 6 (step S210). In this search, the set missing tooth (patient's missing tooth) and the removable partial denture prepared for the patient who had the same missing tooth are selected from the actual data. At this time, when more than a predetermined number of removable partial dentures for the same missing tooth are searched from the actual data (step S220), the database search means 134 displays a screen for causing the display means 15 to input the age and sex of the patient. indicate.

The dentist operates the input means 16 while looking at the screen displayed on the display means 15 to input the age and gender of the patient (step S230). The database search means 134 narrows down the candidates from a large number of searched candidates in the order of the same as or close to the age and gender of the patient.
By doing so, it is possible to search for removable partial dentures whose oral condition is close to that of the patient from the actual data.
When each candidate of the partial denture is searched from the actual data by the database search means 134, the denture model of each candidate is displayed on the display means 15 as the partial denture data (step S240). The removable partial denture data indicating each candidate of the removable partial denture searched by the database search means 134 is displayed in the same manner as in FIG. Although the removable partial denture data is 3D data, the display may be displayed in 2D or 3D.

In this way, the removable partial denture design support device 10 is an ideal portion by simply inputting the position of the missing tooth by the dentist, calculating from the position of the missing tooth, and searching for past achievements. Since some candidates for removable partial dentures are presented to the dentist, it is possible to easily design a removable partial denture that suits the condition of the patient's oral cavity.

As shown in FIG. 12, in this way, in the first basic design of the removable partial denture (steps S110 to S140 shown in FIG. 6A) and the second basic design of the removable partial denture (in FIG. 6B). When the indicated steps S210 to S240) are completed (step S310), the dentist gives the patient's oral cavity to the removable partial denture data designed in the first and second basic designs of the removable partial denture. Additional input of conditions is performed according to the situation in (step S320).
Conditions include, for example, the condition of the abutment tooth and its periodontal tissue, the selection of hook teeth, the position of the rest, and the change of clasp type.

When the dentist selects one of the candidates shown in FIG. 11 by the input means 16, the correction means 14 enlarges the selected candidate on the display means 15 and enters the correction mode.
Then, when the dentist operates the input means 16 to press the position of the abutment tooth on the screen, the abutment tooth is in the changed state, and when a new abutment tooth is pressed and selected, the correction means 14 is a candidate. Abutment tooth is changed and confirmed. Then, when the abutment tooth is changed, the position of the hook tooth and the rest, the position of the large connector, and the position of the large connector are again based on the other abutment tooth including the abutment tooth in which the abutment tooth selection means 132 is changed. Determine candidates. Then, new removable partial denture data is designed with the modified hook tooth, rest and large connector. Further, when the dentist operates the input means 16 to press the position of the clasp or the large connector on the screen, the pressed clasp or the large connector is changed, and a different type of clasp or the large connector, etc. You can choose.

For example, in the example shown in FIG. 13, the removable partial denture B shown in FIG. 11 is selected, and the clasp C22 and the rest R23 are modified. The clasp C22 is changed from the double acre clasp to the acre clasp (clasp C23) with respect to the partial denture B before the change shown in FIG. 13 (A), and the rest R23 is deleted, so that the changed partial denture Bx Is displayed on the display means 15 as shown in FIG. 13 (B).

The dentist gives an explanation and obtains consent while showing the patient a new removable partial denture (see FIG. 13B) displayed on the display means 15. At this time, the removable partial denture displayed on the display means 15 may be a 2D flat denture or, for example, a 3D three-dimensional one as shown in FIG. 13 (C). Three-dimensional 3D is desirable because it is easier for the patient to understand.
If the patient's consent is obtained, the dentist transmits the partial denture data, which is the 3D data of the partial denture obtained by these, from the partial denture design support device 10 to the dental technician terminal device 20. (Step S330).

The dentist then makes an impression and a model.
To make an impression and a model, first, if the removable partial denture has a rest, the rest is formed. In addition, the dentist cuts the abutment tooth or the tooth adjacent to the abutment tooth, if necessary, in order to facilitate the insertion and removal of the clasp (step S340).

Next, the dentist takes an impression (step S350). Impressions are taken from the patient's oral cavity by an optimal method suitable for the patient's oral cavity to create a concave shape. Then, the dentist makes a model from this concave shape into a convex shape by plaster or the like. In addition, the impression may be obtained by scanning the oral cavity with an intraoral scanner and using 3D data as impression data.

The dentist sends the model made to the dental laboratory. When an impression is obtained by scanning with an intraoral scanner, the impression data is transmitted from the removable partial denture design support device 10 to the dental technician terminal device 20 installed in the dental laboratory.
Further, even when the dentist prepares a model (plaster model), the model may be scanned by a 3D scanner and the 3D impression data may be transmitted to the dental technician terminal device 20 (step S360).

When the model is sent from the dental clinic, the dental laboratory scans the model with a 3D scanner connected to the dental technician terminal device 20 to generate 3D impression data for the dental technician. It is taken into the terminal device 20 and stored in the storage means 27.
Further, when the impression data is transmitted from the removable partial denture design support device 10 via the Internet W, it is taken into the storage means 27 from the communication means 21 (step S370).

In the dental technician terminal device 20, for example, as shown in FIG. 14, the model M based on the impression data captured in the storage means 27 (see FIG. 5) and the partial denture Bx based on the partial denture data are superimposed. Then, it is displayed on the display means 24 (step S380).
The dental technician inputs the morphology of the denture base B2 and the complete denture M2 from the superimposed impression data and the removable partial denture data in consideration of the morphology of the bone and mucous membrane and the morphology of the dental arch. Is operated to correct (step S390).
In the dental technician terminal device 20, the correction means 22 corrects the removable partial denture data according to the operation of the input means 25.

The partial denture data corrected in this way is transmitted from the dental technician terminal device 20 to the partial denture design support device 10 (step S400). In the partial denture design support device 10, the partial denture data received from the dental technician terminal device 20 is displayed on the display means 15, so that the dentist can adjust the partial denture according to the actual condition in the oral cavity of the patient. The image of removable partial denture can be shown to the patient.

The dental technician prepares a removable partial denture by an optimum method based on the modified removable partial denture data (step S410).
Further, the metal portion of the modified partial denture data is output to the NC device 130 by the CAM connected to the communication means 21 of the dental technician terminal device 20 by the dental technician operating the input means 25. , Clasps and metal parts such as large connector are made. Once the metal portion is produced, the removable partial denture can be produced by the conventional method thereafter.

When the removable partial denture is prepared, the dental technician makes the final adjustment and sends it to the dentist (step S420).
When the dentist receives the removable partial denture from the dental laboratory, he attaches it to the patient and makes fine adjustments to the denture base and the occlusal surface of the artificial tooth to complete the treatment.

In this way, while exchanging partial denture data between the partial denture design support device 10 and the terminal device 20 for dental technicians, the dentist can proceed while showing the image of the partial denture to the patient. Therefore, it is possible to prevent problems that occur after the removable partial denture is completed in advance.

The present invention is suitable for producing removable partial dentures in a dental clinic.

10 Removable partial denture design support device 11 Communication means 12 Missing tooth setting means 13 Basic design means 131 Prosthesis bed design means 132 Abutment tooth selection means 133 Clasp selection means 134 Database search means 14 Correction means 15 Display means 16 Input means 17 External Device connection means 18 Storage means 20 Dental technician terminal device 21 Communication means 22 Correction means 23 Database search means 24 Display means 25 Input means 26 External device connection means 27 Storage means 110 3D scanner device 120 External memory 130 NC device 140, 150 Relay device W Internet L Abutment interdental line A, B, Bx, C Removable partial denture
B1, B2, B3 Denture base C11, C12, C21, C22, C23, C31, C32 Clasp R11-R13, R21-R23, R31-R34 Rest M1, M2, M3 Large connector S1, S2, S3 Region M model

Claims (8)

A means for setting a missing tooth for inputting the position of the missing tooth,
It is provided with a basic design means for generating a plurality of removable partial denture candidates based on the position of the missing tooth .
The basic design means is the rest of the occlusal surface of the abutment tooth among the abutment tooth candidates selected from the one having the lowest discomfort point calculated based on the number of abutment teeth based on the missing tooth. A removable partial denture design support device that generates a plurality of candidates from the abutment tooth candidates having a large area surrounded by an abutment tooth interval line connecting positions. The basic design unit, partial denture design support apparatus according to claim 1, wherein adding the numerical value indicating the state of deterioration of the abutment to the uncomfortable point. The partial denture design support device according to claim 1 or 2 , wherein the basic design means selects one having a high mastication point calculated based on the number of rests based on the missing tooth from the plurality of candidates. A means for setting a missing tooth for inputting the position of the missing tooth,
It is provided with a basic design means for generating a plurality of removable partial denture candidates based on the position of the missing tooth.
The basic design unit, to that part partial denture design support system provided by selecting from a manufacturing history of the produced partial denture toward the patient which was the same as missing teeth the inputted missing teeth actual data. A means for setting a missing tooth for inputting the position of the missing tooth,
It is provided with a basic design means for generating a plurality of removable partial denture candidates based on the position of the missing tooth.
The basic design unit, from among the plurality of candidates, the missing teeth positions and clasp type parts partial denture design support apparatus you select the one high scoring has been clasp evaluation point based on. Computer,
It is a partial denture design support program for operating as a missing tooth setting means for inputting the position of a missing tooth and a basic design means for generating a plurality of partial denture candidates based on the position of the missing tooth .
The basic design means is the rest of the occlusal surface of the abutment tooth among the abutment tooth candidates selected from the one having the lowest discomfort point calculated based on the number of abutment teeth based on the missing tooth. A removable partial denture design support program that generates multiple candidates from the abutment tooth candidates with a large area surrounded by the abutment tooth line connecting the positions . Computer,
It is a partial denture design support program for operating as a missing tooth setting means for inputting the position of a missing tooth and a basic design means for generating a plurality of partial denture candidates based on the position of the missing tooth .
The basic design means is a partial denture design support program that is selected and provided from actual data which is a production history of a removable partial denture prepared for a patient who has the same missing tooth as the input missing tooth . Computer,
It is a partial denture design support program for operating as a missing tooth setting means for inputting the position of a missing tooth and a basic design means for generating a plurality of partial denture candidates based on the position of the missing tooth .
The basic design means is a removable partial denture design support program that selects one having a high clasp evaluation point scored based on the position of the missing tooth and the type of clasp from the plurality of candidates .

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