Dental training evaluation device, dental training evaluation program, and dental training evaluation method

Abstract

To provide a dental training evaluation device 1, an evaluation program 37, and a dental training evaluation method capable of efficiently and accurately evaluating a cavity shape of a formation model 40.SOLUTION: A dental training evaluation device 1 comprises: acquisition means (intraoral scanner 2 and control unit 36) which acquires an uncut model 38 representing an uncut tooth, a reference model 39 representing a tooth with a cavity formed as a reference, and a formation model 40 representing a tooth with a cavity formed by a trainee; reference data generation means (control unit 36) which generates reference data 50 by deleting an overlapping portion 39b that overlaps with the uncut model 38 in the reference model 39; evaluation data generation means (control unit 36) which generates evaluation target data 60 by deleting an overlapping portion 40b that overlaps with the uncut model 38 in the formation model 40; and evaluation means (control unit 36) which evaluates the evaluation target data 60 on the basis of the reference data 50.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a dental training evaluation device, a dental training evaluation program, and a dental training evaluation method for evaluating a cavity shape formed by a trainee in a dental training course in a university or the like. [Background technology]

[0002] Conventionally, in dental training at universities and other dental courses, instructors visually evaluate the cavity shape of tooth models that trainees have formed by cutting, and provide technical guidance to trainees based on their cutting techniques. In this case, the cavity shape formed by the trainee is evaluated visually by the instructor, which may result in variation in the evaluation of the cavity shape or a lack of fairness in the evaluation.

[0003] Therefore, various techniques have been proposed to evaluate three-dimensional model data obtained by three-dimensionally measuring a tooth model in which a cavity has been formed by a trainee, by comparing it with three-dimensional model data of a model tooth model in which a cavity has been formed.

[0004] For example, Patent Document 1 discloses a dental training evaluation device that evaluates a formation model by comparing the formation model obtained by three-dimensionally measuring a tooth model cut by a trainee with a reference model (maximum allowable shape data and minimum allowable shape data) obtained by three-dimensionally measuring a tooth model in which a cavity of an allowable shape has been formed.

[0005] More specifically, Patent Document 1 determines whether the tooth contour in the formation model extends beyond the tooth contour in the model, and evaluates the portion that extends beyond the model model contour as an area inappropriate for cutting.

[0006] By the way, most of the tooth models used in dental training are uncut, except for the cavity formation parts. Therefore, when comparing the formation model with the reference model to evaluate it, the uncut parts of the formation model are also included in the evaluation.

[0007] In this case, for example, when the difference between the model and the reference model is converted into a score to calculate the total score, the time required to calculate the total score may be long, or the positional deviation of the uncut portion may be converted into a score, causing the total score to vary. This causes a problem that the cavity shape of the model cannot be evaluated efficiently and accurately. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 4338584 Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the above problems, the present invention aims to provide a dental training evaluation device, a dental training evaluation program, and a dental training evaluation method that can efficiently and accurately evaluate the cavity shape of a formation model. [Means for solving the problem]

[0010] This invention is a dental training evaluation device for evaluating cavity shapes in dental training, and is characterized by comprising an acquisition means for acquiring an uncut model showing an uncut tooth, a model model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed by a trainee, a reference data generation means for generating reference data by removing overlapping portions of the model model that overlap the uncut model, an evaluation data generation means for generating evaluation target data by removing overlapping portions of the formed model that overlap the uncut model, and an evaluation means for evaluating the evaluation target data based on the reference data.

[0011] The present invention also provides a dental training evaluation program for evaluating cavity shapes in dental training, and is characterized by executing an acquisition step of acquiring an uncut model showing an uncut tooth, a model model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed by a trainee, a reference data generation step of generating reference data by removing overlapping portions of the model model that overlap the uncut model, an evaluation data generation step of generating data to be evaluated by removing overlapping portions of the formed model that overlap the uncut model, and an evaluation step of evaluating the data to be evaluated based on the reference data.

[0012] The present invention also provides a dental training evaluation method for evaluating cavity shapes in dental training, comprising the steps of: an acquisition step in which an acquisition means acquires an uncut model showing an uncut tooth, a model model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed by a trainee; a reference data generation step in which a reference data generation means generates reference data by removing overlapping portions of the model model that overlap the uncut model; an evaluation data generation step in which an evaluation data generation means generates evaluation target data by removing overlapping portions of the formed model that overlap the uncut model; and an evaluation step in which an evaluation means evaluates the evaluation target data based on the reference data.

[0013] The above-mentioned uncut model, model model and formed model refer to three-dimensional model data obtained by three-dimensionally measuring a tooth model, or three-dimensional model data showing teeth used when conducting dental training in a virtual space. Acquiring the uncut model, example model, and formed model means acquiring them using an intraoral scanner, acquiring them via a communication line, acquiring them via a storage medium, or the like.

[0014] According to this invention, the overlapping portions of the model model that overlap with the uncut model are removed, and the overlapping portions of the formation model that overlap with the uncut model are removed, so that only the cavity formation portions can be extracted from the model model and the formation model, respectively.

[0015] Therefore, when evaluating the evaluation target data based on the reference data, the dental training evaluation device can evaluate only the cavity formation portion of the formation model. This allows the dental training evaluation device to evaluate the cavity shape of the formation model more efficiently and accurately than when the evaluation target includes uncut portions.

[0016] As an aspect of the present invention, the reference data generating means and the evaluation data generating means may be configured to delete the overlapping portion that overlaps the uncut model within a predetermined range. According to this configuration, the positional deviation of the uncut model relative to the example model and the modeled model can be absorbed within a predetermined range.

[0017] This allows the dental training evaluation device to prevent the uncut parts of the example model and the uncut parts of the formation model from being erroneously extracted as cavity formation parts, thereby allowing the dental training evaluation device to efficiently and accurately evaluate the formation model.

[0018] In another aspect of the present invention, the uncut model, the reference model and the formation model may be composed of three-dimensional model data of polygon mesh, and the specified range may be a range based on the length of a line segment linearly connecting the centers of gravity of the mesh plane.

[0019] According to this configuration, compared to the case where the overlapping portion is deleted based on the length of the line segment connecting any position of the model model and the formation model, the cavity formation portion of the model model and the cavity formation portion of the formation model can be extracted efficiently and accurately. Therefore, the dental training evaluation device can evaluate the training formation model with higher accuracy.

[0020] In another aspect of the present invention, the evaluation means is configured to extract from the evaluation target data under-cutting portions where cutting is insufficient compared to the reference data and over-cutting portions where cutting is excessive compared to the reference data, and may be equipped with an output means for visualizing and displaying the under-cutting portions and over-cutting portions extracted by the evaluation means on the formation model.

[0021] According to this configuration, it is possible to visualize which parts of the cavity shape in the formation model have been over-cut or under-cut, and provide this to the instructor and trainee. In this way, the dental training evaluation device can help the trainee recognize the difference between the model cavity shape and the dental training evaluation device, thereby supporting the instructor's instruction of cutting techniques. Therefore, the dental training evaluation device can help the trainee improve his or her cavity formation technique.

[0022] In another aspect of the invention, the evaluation means is configured to determine the proportion of the insufficient cutting portion and the proportion of the excessive cutting portion for each distance category defined by dividing the distance from the reference data by a predetermined interval, and to display the distribution of the proportion of the insufficient cutting portion and the distribution of the proportion of the excessive cutting portion together with the formation model, wherein the evaluation means is configured to determine the proportion of the insufficient cutting portion and the proportion of the excessive cutting portion for each distance category defined by dividing the distance from the reference data by a predetermined interval, and to display the distribution of the proportion of the insufficient cutting portion and the distribution of the proportion of the excessive cutting portion together with the formation model.

[0023] The proportion of the insufficient cutting parts refers to the proportion of the area of ​​the insufficient cutting parts within a distance division to the total area of ​​the insufficient cutting parts or the total area of ​​the data to be evaluated, or the proportion of the number of point clouds of the insufficient cutting parts within a distance division to the total number of point clouds of the insufficient cutting parts or the total number of point clouds of the data to be evaluated, etc.

[0024] The percentage of the over-cutting portion refers to the percentage of the area of ​​the over-cutting portion within a distance division to the total area of ​​the over-cutting portion or the total area of ​​the data to be evaluated, or the percentage of the number of point clouds of the over-cutting portion within a distance division to the total number of point clouds of the over-cutting portion or the total number of point clouds of the data to be evaluated, etc.

[0025] According to this configuration, the distribution state of the undercutting and overcutting parts for each distance section can be visualized and provided to the instructor and trainee. In this way, the dental training evaluation device can help the trainee recognize the difference between the model cavity shape and the dental training evaluation device, thereby supporting the instructor's instruction of cutting techniques. Therefore, the dental training evaluation device can help the trainee improve his or her cavity formation technique. Effect of the Invention

[0026] According to the present invention, it is possible to provide a dental training evaluation device, a dental training evaluation program, and a dental training evaluation method that can efficiently and accurately evaluate the cavity shape of a formation model. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is a diagram showing the configuration of a dental training evaluation device. [Diagram 2] FIG. 2 is a block diagram showing the internal configuration of a dental training evaluation device. [Diagram 3] FIG. 4 is an explanatory diagram for explaining three-dimensional model data of a tooth model. [Figure 4] 4 is a flowchart showing a processing operation when an evaluation program is executed. [Diagram 5] FIG. 4 is a schematic explanatory diagram for explaining an outline of a menu screen. [Figure 6] FIG. 4 is an explanatory diagram for explaining an outline of a process for generating reference data. [Figure 7] 11 is a flowchart showing the processing operation of a reference data generating process. [Figure 8] FIG. 11 is an explanatory diagram illustrating a process of deleting a mesh plane of the example model. [Figure 9]FIG. 2 is an explanatory diagram for explaining an outline of a generation process of evaluation target data. [Figure 10] FIG. 1 is an explanatory diagram for explaining an analysis process of evaluation target data. [Figure 11] FIG. 13 is a schematic explanatory diagram illustrating an overview of a first evaluation result screen. [Figure 12] FIG. 13 is a schematic explanatory diagram illustrating an overview of a second evaluation result screen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] An embodiment of the present invention will now be described with reference to the drawings. The dental training evaluation device 1 of the present embodiment is a device for evaluating a cavity shape formed by a trainee in a dental training in a dental course. Such a dental training evaluation device 1 will be described with reference to Figs. 1 to 3.

[0029] FIG. 1 shows a configuration diagram of the dental training evaluation device 1, FIG. 2 shows a block diagram of the dental training evaluation device 1, and FIG. 3 shows an explanatory diagram for explaining three-dimensional model data of a tooth model. Specifically, FIG. 3(a) shows an external perspective view of an uncut model 38, FIG. 3(b) shows an external perspective view of a model 39, and FIG.

[0030] The dental training evaluation device 1 of this embodiment is a terminal used by a trainee conducting dental training or an instructor instructing the trainee, and has the function of measuring the tooth shape of a tooth model, the function of evaluating the cavity shape formed by the trainee, and the function of visualizing and outputting the evaluation results.

[0031] As shown in Figure 1, this dental training evaluation device 1 includes an intraoral scanner 2 for measuring the tooth shape of a tooth model T, a device main body 3 to which the intraoral scanner 2 is connected, and a printer 4 connected to the device main body 3.

[0032] 1, the intraoral scanner 2 is a device for scanning the inside of the oral cavity or measurement target sites of the lower jaw UJ or the upper jaw (not shown) in a jaw model with a tooth model T attached thereto, and is formed in a roughly cylindrical pen shape extending in a predetermined direction. Note that the intraoral scanner 2 is a well-known device, so it will be briefly described in this embodiment.

[0033] Specifically, as shown in FIG. 2, the intraoral scanner 2 includes a light-emitting unit 21 that emits light toward the area to be measured, a light-receiving unit 22 that receives the reflected light of the light reflected from the area to be measured, and an operating unit 23 that emits the light.

[0034] The intraoral scanner 2 further includes an input / output unit 24 to which a connection cable (reference number omitted) is connected and which inputs and outputs various signals to and from the device main body 3, and a measurement control unit 25 which controls the operations of these units.

[0035] As shown in FIG. 2, the device main body 3 also includes a display unit 31 that displays various information, an operation receiving unit 32 that receives operations from the user, and a scanner connection unit 33 to which the intraoral scanner 2 is connected. Furthermore, the device main body 3 includes a printer connection section 34 to which the printer 4 is connected, a storage section 35 for storing various information, and a control section 36 for controlling the operations of these sections.

[0036] More specifically, the display unit 31 is configured with, for example, a liquid crystal display as shown in FIG. 1, and has a function of displaying various information in response to a control signal from the control unit . As shown in FIG. 1, the operation reception unit 32 is composed of, for example, a keyboard 32a and a mouse 32b, and has a function of receiving input operations by a user and a function of outputting information indicating the received input contents to the control unit 36.

[0037] The scanner connection unit 33 is composed of, for example, a USB (Universal Serial Bus) and has the function of connecting to the intraoral scanner 2 via a connection cable and the function of sending and receiving various information between the intraoral scanner 2.

[0038] The printer connection unit 34 is configured, for example, by a USB (Universal Serial Bus) or the like, and has a function of connecting to the printer 4 via a connection cable, and a function of transmitting and receiving various information to and from the printer 4.

[0039] The storage unit 35 is composed of a hard disk or a non-volatile memory, and has a function of writing and storing various information, and a function of reading out various information. As shown in Fig. 2, the storage unit 35 stores an evaluation program 37 which is executed by the control unit 36 ​​and which evaluates the cavity shape formed by the trainee.

[0040] Furthermore, the memory unit 35 stores, as shown in Figure 2, an uncut model 38, a model model 39, and a formed model 40, which are three-dimensional model data obtained by three-dimensionally measuring a tooth model with the intraoral scanner 2, as well as evaluation result information 41 that shows the evaluation result of the formed model 40. The uncut model 38 and the example model 39 are stored in advance in the storage unit 35, and the formed model 40 is obtained by executing the evaluation program 37 described later.

[0041] Here, the uncut model 38, the reference model 39 and the formed model 40 are external shape data indicating the contour of the tooth model T, and are polygon mesh data having a group of points arranged along the contour of the tooth model T and a triangular mesh plane having vertices made up of three adjacent points among the group of points.

[0042] In detail, the uncut model 38 is three-dimensional model data obtained by three-dimensionally measuring a tooth model T, which is an uncut artificial tooth that has not been cut by the trainee or instructor, using the intraoral scanner 2, as shown in Figure 3(a).

[0043] 3(b), the example model 39 is three-dimensional model data obtained by three-dimensionally measuring a tooth model T, which is an artificial tooth in which a model cavity has been formed by an instructor, using the intraoral scanner 2. In this example model 39, a cavity formation portion 39a, which is a cavity formed by the instructor, is recessed.

[0044] 3(c), the formation model 40 is three-dimensional model data obtained by three-dimensionally measuring a tooth model T, which is an artificial tooth in which a cavity has been formed by a trainee, with the intraoral scanner 2. In this formation model 40, a cavity formation portion 40a, which is a cavity formed by the trainee, is recessed.

[0045] In addition, the tooth model T in which a cavity is formed by the instructor and the tooth model T in which a cavity is formed by the trainee are assumed to be machined tooth models T identical to the uncut tooth model T which becomes the uncut model 38.

[0046] The control unit 36 ​​is composed of hardware such as a CPU and a memory, and software such as a control program. This control unit 36 ​​has a processing function related to the exchange of various signals with the intraoral scanner 2, a processing function related to the exchange of various signals with the display unit 31, the operation reception unit 32, the scanner connection unit 33, the printer connection unit 34 and the memory unit 35, and a function to control the operation of each unit connected via a specified bus.

[0047] Next, the processing operations performed when the evaluation program 37 is executed in the dental training evaluation device 1 having the above-mentioned configuration will be described with reference to FIGS. Note that Figure 4 shows a flowchart of the processing operation when the evaluation program 37 is executed, Figure 5 shows a schematic diagram explaining the outline of the menu screen 200, and Figure 6 shows a schematic diagram explaining the process of generating the reference data 50.

[0048] Specifically, Figure 6(a) shows an external oblique view of an uncut model 38 and a model model 39 in which a cavity formation portion 39a has been formed, and Figure 6(b) shows an external oblique view of reference data 50 obtained by extracting the cavity formation portion 39a of the model model 39.

[0049] Furthermore, Figure 7 shows a flowchart of the reference data generation process, Figure 8 shows an explanatory diagram explaining the process of deleting the mesh plane 391 of the sample model 39, and Figure 9 shows an explanatory diagram outlining the process of generating the evaluation target data 60.

[0050] Specifically, Figure 9(a) shows an external oblique view of the uncut model 38 and the formation model 40 in which the cavity formation portion 40a has been formed, and Figure 9(b) shows an external oblique view of the evaluation target data 60 obtained by extracting the cavity formation portion 40a of the formation model 40. Furthermore, FIG. 10 shows an explanatory diagram for explaining the analysis process of the evaluation target data 60. In FIG.

[0051] Specifically, Figure 10(a) shows an external perspective view of the superimposed reference data 50 and evaluation target data 60 viewed from above, Figure 10(b) shows an external perspective view of the superimposed reference data 50 and evaluation target data 60 viewed from below, and Figure 10(c) shows a cross-sectional view taken along the arrow AA in Figure 10(a). In addition, FIG. 11 shows a schematic diagram for explaining an outline of a first evaluation result screen 210, and FIG. 12 shows a schematic diagram for explaining an outline of a second evaluation result screen 220. As shown in FIG.

[0052] First, the trainee measures an uncut tooth model T using the intraoral scanner 2, stores the uncut model 38 in the memory unit 35 of the device main body 3, and then uses the tooth model T to form a cavity. Thereafter, when the evaluation program 37 is executed by the trainee or instructor, the control unit 36 ​​of the device body 3 displays the menu screen 200, which guides users through various operations, on the display unit 31, as shown in FIG. 4 (step S101).

[0053] For example, as shown in FIG. 5, the menu screen 200 displays the title "Menu", a guidance message saying "Please select an operation", and a three-dimensional measurement button 201 for starting measurement of a tooth model T in which a cavity has been formed by a trainee using the intraoral scanner 2.

[0054] Furthermore, the menu screen 200 displays an analysis evaluation execution button 202 for starting the analysis evaluation of the formation model 40, a read button 203 for reading out the evaluation result information 41 stored in the memory unit 35 and displaying it on the display unit 31, and an exit button 204 for terminating the evaluation program 37.

[0055] When the menu screen 200 is displayed, the control unit 36 ​​determines which of the three-dimensional measurement button 201, the analysis and evaluation execution button 202, and the read button 203 displayed on the menu screen 200 has been pressed, as shown in FIG. 4 (step S102).

[0056] When the three-dimensional measurement button 201 is pressed by an instructor or a trainee who wishes to scan the tooth model T (step S102:1), the control unit 36 ​​displays a measurement guidance screen (not shown) on the display unit 31 to guide the scanning of the tooth model T (step S103).

[0057] At this time, the instructor or the trainee follows the instructions displayed on the measurement guide screen to scan the tooth model T in which the trainee has formed a cavity, using the intraoral scanner 2. When the measurement guide screen is displayed, the control unit 36 ​​determines whether or not scanning of the tooth model T is completed, as shown in FIG. 4 (step S104). If the scanning of the tooth model T is not completed (step S104: No), the control unit 36 ​​puts the process on hold until the scanning of the tooth model T is completed.

[0058] On the other hand, if the scanning of the tooth model T is completed (step S104: Yes), the control unit 36 ​​generates the formation model 40 based on the signal acquired from the intraoral scanner 2 (step S105). Thereafter, the control unit 36 ​​stores the generated formative model 40 in the storage unit 35, and then returns the process to step S101.

[0059] Furthermore, in step S102 of FIG. 4, when the analysis evaluation execution button 202 is pressed (step S102:2), the control unit 36 ​​reads out the three-dimensional model data (uncut model 38, example model 39 and formed model 40) from the storage unit 35 (step S106).

[0060] At this time, the control unit 36 ​​places the uncut model 38, the model model 39 and the formation model 40 on the same three-dimensional coordinate system consisting of the X-axis, Y-axis and Z-axis, aligns the uncut parts of the model model 39 and the uncut parts of the formation model 40 so that they overlap with the uncut model 38, and then temporarily stores them together with their respective position coordinates.

[0061] For example, the control unit 36 ​​superimposes and aligns the uncut model 38 with a reference model showing an uncut tooth previously registered at the origin position coordinates so that the overlay error is minimized. Similarly, the control unit 36 ​​superimposes and aligns the example model 39 and the formation model 40 with each other so that the overlay error of the uncut portion is minimized with respect to the reference model.

[0062] After reading out the uncut model 38, the example model 39, and the model 40, the control unit 36 ​​starts a reference data generation process to generate reference data 50 by deleting the overlapping portion 39b of the example model 39 that overlaps the uncut model 38 (step S107).

[0063] At this time, as shown in Figure 6(a), the control unit 36 ​​deletes the overlapping portion 39b (light gray portion in the figure) of the model model 39 that overlaps with the uncut model 38 within a specified range, i.e., the uncut portion of the model model 39, and extracts the cavity formation portion 39a of the model model 39 to generate reference data 50 (see Figure 6(b)).

[0064] More specifically, after starting the reference data generation process, the control unit 36 ​​calculates the position coordinates of the center of gravity G1 (see Figure 8) on all mesh planes 381 of the uncut model 38, and the position coordinates of the center of gravity G2 (see Figure 8) on all mesh planes 391 of the model model 39, as shown in Figure 7 (step S121).

[0065] Specifically, as shown in FIG. 8, the control unit 36 ​​calculates position coordinates indicating the position of the center of gravity G1 on the mesh plane 381 based on the position coordinates of three points P1 that form a triangular mesh plane 381 among the group of points that constitute the uncut model 38.

[0066] Furthermore, as shown in Figure 8, the control unit 36 ​​calculates position coordinates indicating the position of the center of gravity G2 on the mesh plane 391 based on the position coordinates of three points P2 that form a triangular mesh plane 391 among the group of points that constitute the example model 39.

[0067] Then, as shown in FIG. 7, based on the position coordinates of the center of gravity G1 and the position coordinates of the center of gravity G2, the control unit 36 ​​detects a mesh plane 391 of the example model 39 that has the shortest three-dimensional distance L to the center of gravity G1 of the uncut model 38 (step S122).

[0068] 8, the three-dimensional distance L is a distance calculated based on the position coordinates of the center of gravity G1 and the position coordinates of the center of gravity G2, and is the length of a line segment linearly connecting the center of gravity G1 of the uncut model 38 and the center of gravity G2 of the example model 39. In other words, the three-dimensional distance L is the offset amount of the position coordinates of the center of gravity G2 relative to the position coordinates of the center of gravity G1.

[0069] Specifically, first, the control unit 36 ​​extracts one center of gravity G1 of the uncut model 38, and calculates the three-dimensional distance L from the extracted center of gravity G1 to all centers of gravity G2 of the example model 39.

[0070] Furthermore, the control unit 36 ​​extracts the center of gravity G2 whose three-dimensional distance L from the center of gravity G1 is the shortest among all the calculated three-dimensional distances L, and determines the mesh plane 391 of the example model 39 on which the center of gravity G2 is located as the detection target. Then, the control unit 36 ​​temporarily stores the determined mesh plane 391 and the three-dimensional distance L in association with each other.

[0071] Thereafter, the control unit 36 ​​determines whether the three-dimensional distance L is within a predetermined range (step S123). Note that the predetermined range is, for example, the three-dimensional distance L being within 0.05 mm, or the three-dimensional distance L being within 0.1 mm.

[0072] If the three-dimensional distance L is not within the predetermined range (step S123: No), the control unit 36 ​​sets the mesh plane 391 of the example model 39 as the mesh plane forming the cavity formation portion 39a of the example model 39, and advances the process to step S125.

[0073] On the other hand, if the three-dimensional distance L is within the predetermined range (step S123: Yes), the control unit 36 ​​deletes the point P2 forming the apex of the triangle, and deletes the mesh plane 391 of the example model 39 (step S124).

[0074] Thereafter, the control unit 36 ​​determines whether or not the processes from step S122 to step S124 described above have been completed for all mesh planes 381 in the uncut model 38, as shown in FIG. 7 (step S125).

[0075] If the processing for all the mesh planes 381 in the uncut model 38 has not been completed (step S125: No), the control unit 36 ​​returns the process to step S122 and repeats the processing from step S122 to step S125 until the processing for all the mesh planes 381 has been completed.

[0076] On the other hand, when processing has been completed for all mesh planes 381 in the uncut model 38 (step S125: Yes), the overlapping portion 39b in the model model 39 that overlaps with the uncut model 38 is deleted, and the cavity formation portion 39a of the model model 39 is extracted.

[0077] Therefore, the control unit 36 ​​stores the extracted cavity formation portion 39a of the example model 39 as the reference data 50 in the storage unit 35 (step S126), and then ends the reference data generation process and proceeds to step S108 in FIG.

[0078] When the process proceeds to step S108 in FIG. 4, the control unit 36 ​​starts an evaluation object data generation process for generating evaluation object data 60 by deleting the overlapping portion 40b in the forming model 40 that overlaps with the uncut model 38 (step S108).

[0079] At this time, as shown in Figure 9(a), the control unit 36 ​​deletes the overlapping portion 40b (light gray portion in the figure) of the formation model 40 that overlaps with the uncut model 38 within a specified range, i.e., the uncut portion of the formation model 40, and extracts the cavity formation portion 40a of the formation model 40 to generate the evaluation target data 60 (see Figure 9(b)).

[0080] The evaluation target data generation process has the same processing operations as the above-mentioned reference data generation process, except that the formative model 40 is used instead of the model model 39. Therefore, the processing operations will be explained here using the flow of the processing operations of the reference data generation process in Figure 7.

[0081] More specifically, after starting the evaluation target data generation process, the control unit 36 ​​calculates the position coordinates of the center of gravity G1 on the mesh plane 381 of the uncut model 38 and the position coordinates of the center of gravity on the mesh plane of the formed model 40 in step S121 of FIG. The position coordinates of the center of gravity G1 in the uncut model 38 may be the values ​​calculated in step S107 described above.

[0082] Furthermore, in step S122 of Figure 7, the control unit 36 ​​detects the mesh plane of the forming model 40 which has the shortest three-dimensional distance L to the center of gravity G1 of the uncut model 38 based on the position coordinates of the center of gravity G1 in the mesh plane 381 of the uncut model 38 and the position coordinates of the center of gravity in the mesh plane of the forming model 40.

[0083] Then, in step S123 of FIG. 7, if the three-dimensional distance L is not within the predetermined range (step S123: No), the control unit 36 ​​sets the mesh plane of the formation model 40 as the mesh plane forming the cavity formation portion 40a of the formation model 40, and proceeds to step S125.

[0084] On the other hand, if the three-dimensional distance L is within the predetermined range (step S123: Yes), the control unit 36 ​​deletes the points forming the vertices of the triangle in step S124 of FIG. 7, and deletes the mesh plane of the formation model 40.

[0085] Then, in step S125 of FIG. 7, if processing has not been completed for all mesh planes 381 in the uncut model 38 (step S125: No), the control unit 36 ​​returns the processing to step S122 and repeats the processing from step S122 to step S125 until processing has been completed for all mesh planes 381.

[0086] On the other hand, when processing has been completed for all mesh planes 381 in the uncut model 38 (step S125: Yes), the overlapping portion 40b in the forming model 40 that overlaps the uncut model 38 is deleted, and the cavity formation portion 40a of the forming model 40 is extracted.

[0087] Therefore, in step S126 of Figure 7, the control unit 36 ​​stores the extracted cavity formation portion 40a of the formation model 40 in the memory unit 35 as evaluation target data 60, and then terminates the evaluation target data generation process and proceeds to step S109 of Figure 4.

[0088] When the process proceeds to step S109 in FIG. 4, the control unit 36 ​​starts an analysis and evaluation process for analyzing and evaluating the evaluation target data 60 based on the reference data 50 (step S109). At this time, the control unit 36 ​​performs analysis and evaluation of the evaluation target data 60 (light gray part in the figure) by overlaying the evaluation target data 60 (light gray part in the figure) on the reference data 50 (dark gray part in the figure) as shown in Figures 10(a) and 10(b).

[0089] Specifically, similar to the above-mentioned reference data generation process, the control unit 36 ​​calculates the position coordinates of the center of gravity in the mesh plane of the reference data 50 and the position coordinates of the center of gravity in the mesh plane of the evaluation target data 60 based on the position coordinates of the point clouds constituting the reference data 50 and the position coordinates of the point clouds constituting the evaluation target data 60.

[0090] Furthermore, the control unit 36 ​​calculates the difference between the position coordinates of the center of gravity of the evaluation target data 60 and the position coordinates of the center of gravity of the reference data 50 as the cavity shape offset amount with respect to the reference data 50. More specifically, the control unit 36 ​​defines the direction toward the inside of the cavity shape contour formed by the reference data 50 as the positive direction, and calculates the vector amount from the center of gravity of the reference data 50 to the center of gravity of the data to be evaluated 60 as the cavity shape offset amount, with the three-dimensional distance from the center of gravity of the reference data 50 to the center of gravity of the data to be evaluated 60 being the magnitude.

[0091] At this time, the control unit 36 ​​identifies the region where the cavity shape offset amount is a positive value as an over-cut portion 60a that has been cut in excess of the cavity formed by the instructor. In other words, the control unit 36 ​​identifies the region where the contour of the cavity shape formed by the evaluation target data 60 is located inside the contour of the cavity shape formed by the reference data 50 as the over-cut portion 60a.

[0092] On the other hand, the control unit 36 ​​identifies an area where the cavity shape offset amount is a negative value as an insufficient cutting portion 60b where cutting is insufficient compared to the cavity formed by the instructor. In other words, the control unit 36 ​​identifies the region where the contour of the cavity shape formed by the evaluation target data 60 is located outside the contour of the cavity shape formed by the reference data 50 as the insufficient cutting portion 60b.

[0093] For example, as shown in FIG. 10(c), the control unit 36 ​​identifies the portion in the Z-axis direction where the cavity shape indicated by the evaluation data 60 shown by a solid line is lower than the cavity shape indicated by the reference data 50 shown by a dashed line as an over-cut portion 60a, and identifies the portion in the Z-axis direction where the cavity shape indicated by the evaluation data 60 is higher than the cavity shape indicated by the reference data 50 as an under-cut portion 60b.

[0094] Thereafter, the control unit 36 ​​calculates the total area of ​​the over-cut portions 60a and the total area of ​​the under-cut portions 60b based on the area of ​​each mesh plane constituting the evaluation target data 60.

[0095] Furthermore, the control unit 36 ​​calculates a division area indicating the area of ​​the excess cutting portion 60a within the distance division for each distance division based on the distance divisions obtained by dividing the three-dimensional distance from the center of gravity of the reference data 50 at predetermined intervals and the area of ​​the mesh plane of the evaluation target data 60 located within the distance division.

[0096] In addition, the control unit 36 ​​calculates a division area indicating the area of ​​the insufficient cutting portion 60b within the distance division for each distance division based on the above-mentioned distance division and the area of ​​the mesh plane of the evaluation target data 60 located within the distance division. Note that the distance divisions are set and registered in advance.

[0097] After calculating the total area and the divided area, the control unit 36 ​​calculates the ratio of the divided area of ​​the over-cut portion 60a to the total area of ​​the over-cut portion 60a as the over-cut area ratio for each distance section.

[0098] Furthermore, the control unit 36 ​​calculates the ratio of the section area of ​​the insufficient-cutting portion 60b to the total area of ​​the insufficient-cutting portion 60b as an insufficient-cutting area ratio for each distance section. Then, the control unit 36 ​​assigns a score to the over-cut portion 60a and the under-cut portion 60b by a deduction point based on a predetermined correspondence relationship between the over-cut area ratio and the under-cut area ratio and the score.

[0099] Then, the control unit 36 ​​generates evaluation result information 41 that associates the over-cut area ratio and under-cut area ratio for each distance category, the deduction points for the over-cut portion 60a, and the deduction points for the under-cut portion 60b with the evaluation target data 60, and stores the information in the memory unit 35.

[0100] When the analysis and evaluation process in step S109 in FIG. 4 is completed, the control unit 36 ​​displays the first evaluation result screen 210, which presents the evaluation result of the formation model 40, on the display unit 31 based on the evaluation result information 41 (step S110).

[0101] 4, even when the read button 203 is pressed (step S102:3), the control unit 36 ​​displays the first evaluation result screen 210 on the display unit 31 based on the evaluation result information 41 in the storage unit 35.

[0102] For example, on the first evaluation result screen 210, as shown in FIG. 11, a color map 211 is displayed on the left side of the screen, in which the over-cut portion 60a is displayed in a warm color and the under-cut portion 60b is displayed in a cool color, and the colors correspond to the cavity shape offset amount, and a percentage distribution column 212 is displayed on the left side of the screen, which shows the distribution of the over-cut area ratio and the under-cut area ratio. Although detailed illustration is omitted, the first evaluation result screen 210 also displays the number of deductions for the over-cut portion 60a and the number of deductions for the under-cut portion 60b.

[0103] Furthermore, as shown in Figure 11, the first evaluation result screen 210 displays, below the color map 211, a cross-section display button 213 for displaying the cavity shape of the formation model 40 in cross section, a print button 214 for printing the display contents of the first evaluation result screen 210, and a close button 215 for closing the first evaluation result screen 210 and returning to the menu screen 200.

[0104] In addition, the first evaluation result screen 210 displays the formation model 40 on the right side of the screen, with the over-cut portions 60a and the under-cut portions 60b colored in the color of the color map 211 corresponding to the cavity shape offset amount. In other words, the formation model 40 is displayed on the first evaluation result screen 210 with the area indicating the over-cut portion 60a and the area indicating the under-cut portion 60b superimposed, and the cavity shape offset amount relative to the reference model 39 visualized in color.

[0105] When the instructor or trainee presses the cross-section display button 213 while this first evaluation result screen 210 is displayed, the control unit 36 ​​displays the second evaluation result screen 220 on the display unit 31 instead of the first evaluation result screen 210.

[0106] For example, on the second evaluation result screen 220, as shown in FIG. 12, an adjustment field 221 for adjusting the cross-sectional position of the formation model 40 with the cursor is displayed in the upper left corner of the screen, and below that is a cross-sectional change button 222 for changing the direction of the cross-sectional surface.

[0107] Furthermore, the second evaluation result screen 220 displays, below the cross section change button 222, a three-dimensional display button 223 for displaying the first evaluation result screen 210, a print button 224 for printing the display contents of the second evaluation result screen 220, and a close button 225 for closing the second evaluation result screen 220 and returning to the menu screen 200.

[0108] In addition, the second evaluation result screen 220 displays a cross-sectional display field 226 on the right side of the screen, which superimposes and displays the cross-sectional shape of the formation model 40 (thick solid line in the figure) at the cross-sectional position of the adjustment field 221, the cross-sectional shape of the uncut model 38 (dashed line in the figure), and the cross-sectional shape of the model model 39 (thin solid line in the figure). In the cross section display field 226, the over-cut portion 60a and the under-cut portion 60b are filled in with different colors.

[0109] When the above-mentioned first evaluation result screen 210 or second evaluation result screen 220 is displayed on the display unit 31, and the close button 215 of the first evaluation result screen 210 or the close button 225 of the second evaluation result screen 220 is pressed, the control unit 36 ​​returns the processing to step S101 and displays the menu screen 200, as shown in FIG. 4. Then, the control unit 36 ​​repeats the processes from step S101 to step S110 until the end button 204 on the menu screen 200 is pressed.

[0110] In this way, the dental training evaluation device 1 and evaluation program 37, as well as the dental training evaluation method using the dental training evaluation device 1, evaluate the cavity shape of the formation model 40 based on the reference data 50, which is the cavity formation portion 39a of the model model 39, and the evaluation target data 60, which is the cavity formation portion 40a of the formation model 40.

[0111] As described above, the dental training evaluation device 1 of this embodiment, which evaluates cavity shape in dental training, is equipped with an acquisition means (intraoral scanner 2 and control unit 36) for acquiring an uncut model 38 showing an uncut tooth, a model model 39 showing a tooth in which a model cavity has been formed, and a formed model 40 showing a tooth in which a cavity has been formed by the trainee.

[0112] Furthermore, the dental training evaluation apparatus 1 includes a reference data generating means (control unit 36) that generates reference data 50 by deleting an overlapping portion 39b of the example model 39 that overlaps with the uncut model 38.

[0113] The dental training evaluation device 1 is equipped with an evaluation data generation means (control unit 36) that generates evaluation target data 60 by deleting the overlapping portion 40b in the formation model 40 that overlaps with the uncut model 38, and an evaluation means (control unit 36) that evaluates the evaluation target data 60 based on the reference data 50.

[0114] In addition, the evaluation program 37 of this embodiment executes an acquisition step (step S106) to acquire an uncut model 38 showing an uncut tooth, a model model 39 showing a tooth in which a model cavity has been formed, and a formed model 40 showing a tooth in which a cavity has been formed by a trainee.

[0115] Furthermore, the evaluation program 37 executes a reference data generating step (step S107) of generating reference data 50 by deleting the overlapping portion 39b of the sample model 39 that overlaps with the uncut model .

[0116] The evaluation program 37 then executes an evaluation data generation step (step S108) of generating evaluation target data 60 by deleting the overlapping portion 40b in the forming model 40 that overlaps with the uncut model 38, and an evaluation step (step S109) of evaluating the evaluation target data 60 based on the reference data 50.

[0117] In addition, the dental training evaluation method of this embodiment includes an acquisition process (step S106) in which an acquisition means acquires an uncut model 38 showing an uncut tooth, a model model 39 showing a tooth in which a model cavity has been formed, and a formed model 40 showing a tooth in which a cavity has been formed by the trainee.

[0118] Furthermore, the dental training evaluation method includes a reference data generating step (step S107) in which the reference data generating means generates reference data 50 by deleting overlapping portion 39b of sample model 39 that overlaps uncut model .

[0119] The dental training evaluation method includes an evaluation data generation process (step S108) in which evaluation data generation means generates evaluation target data 60 by deleting overlapping portions 40b in the formation model 40 that overlap with the uncut model 38, and an evaluation process (step S109) in which evaluation means evaluates the evaluation target data 60 based on reference data 50.

[0120] According to this configuration, the overlapping portion 39b in the model model 39 that overlaps with the uncut model 38 is removed, and the overlapping portion 40b in the formation model 40 that overlaps with the uncut model 38 is removed, so that only the cavity formation portions 39a, 40a can be extracted from the model model 39 and the formation model 40, respectively.

[0121] Therefore, when evaluating the evaluation target data 60 based on the reference data 50, the dental training evaluation device 1 can evaluate only the cavity formed portion 40a of the formation model 40 as the evaluation target. This allows the dental training evaluation device 1 to evaluate the cavity shape of the formation model 40 more efficiently and accurately than when the evaluation target includes the uncut portion (overlapped portion 40b).

[0122] In addition, since the reference data generating means (control unit 36) and the evaluation data generating means (control unit 36) delete the overlapping portions 39b, 40b that overlap the uncut model 38 within a specified range, the dental training evaluation device 1 can absorb the positional misalignment of the uncut model 38 relative to the example model 39 and the formation model 40 within a specified range.

[0123] This allows the dental training evaluation device 1 to prevent the uncut parts of the example model 39 and the uncut parts of the formation model 40 from being erroneously extracted as cavity formation parts 39a, 40a. Therefore, the dental training evaluation device 1 can efficiently and accurately evaluate the formation model 40.

[0124] The uncut model 38, the example model 39, and the model 40 are configured with three-dimensional model data of polygon meshes. The predetermined range is based on the length of a line segment that linearly connects the centers of gravity G1 and G2 of the mesh plane (three-dimensional distance L).

[0125] According to this configuration, the cavity formation portion 39a of the model model 39 and the cavity formation portion 40a of the formation model 40 can be extracted more efficiently and accurately than when the overlapping portions 39b, 40b are deleted based on the length of the line segment connecting arbitrary positions of the model model 39 and the formation model 40. Therefore, the dental training evaluation device 1 can evaluate the formation model 40 with higher accuracy.

[0126] The evaluation means (control unit 36) is configured to extract from the evaluation target data 60 an undercut portion 60b where cutting is insufficient with respect to the reference data 50, and an overcut portion 60a where cutting is excessive with respect to the reference data 50.

[0127] The dental training evaluation device 1 is provided with an output means (display unit 31) that visualizes and displays on the formation model 40 the undercut portion 60b and the overcut portion 60a extracted by the evaluation means.

[0128] According to this configuration, it is possible to visualize which parts of the cavity shape in the formation model 40 have been over-cut or under-cut, and provide this to the instructor and trainee. This allows the dental training evaluation device 1 to help the trainee recognize the difference between the model cavity shape and the actual shape, thereby supporting the instructor's instruction of cutting techniques. Therefore, the dental training evaluation device 1 can help the trainee improve his or her cavity formation technique.

[0129] In addition, the evaluation means (control unit 36) is configured to calculate the proportion of the divided area occupied by the undercut portion 60b and the proportion of the divided area occupied by the overcut portion 60a for each distance section obtained by dividing the distance from the center of gravity of the reference data 50 at a predetermined interval.

[0130] The dental training evaluation device 1 is equipped with a display means (display unit 31) for displaying the distribution of the proportion of the divided area of ​​the undercut portion 60b and the distribution of the proportion of the divided area of ​​the overcut portion 60a together with the formation model 40.

[0131] According to this configuration, the distribution state of the undercutting portion 60b and the overcutting portion 60a for each distance section can be visualized and provided to the instructor and the trainee. This allows the dental training evaluation device 1 to help the trainee recognize the difference between the model cavity shape and the actual shape, thereby supporting the instructor's instruction of cutting techniques. Therefore, the dental training evaluation device 1 can help the trainee improve his or her cavity formation technique.

[0132] In the configuration of the present invention and the correspondence with the above-mentioned embodiment, The acquisition means of the present invention corresponds to the intraoral scanner 2 and the control unit 36 ​​of the embodiment. Similarly, The reference data generating means, the evaluation data generating means, and the evaluation means correspond to the control unit 36. The output means corresponds to the display unit 31. The length of the line segment that connects the centers of gravity of the mesh plane corresponds to the three-dimensional distance L, The dental practice evaluation program corresponds to evaluation program 37, The acquisition step and the acquisition process correspond to step S106. The reference data generating step and the reference data generating process correspond to step S107, The evaluation data generation step and the evaluation data generation process correspond to step S108, The evaluation step and the evaluation process correspond to step S109, The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

[0133] Specifically, in the above-described embodiment, the intraoral scanner 2 is connected to the device main body 3 via a connection cable (symbol omitted), but this is not limited to this, and the intraoral scanner may be connected to the device main body 3 wirelessly. Furthermore, the timing for acquiring the uncut model 38, the example model 39, and the formed model 40 is not limited to the above-described embodiment, and may be any appropriate timing as long as the formed model 40 can be evaluated.

[0134] In addition, the uncut model 38, the model model 39 and the formed model 40 are three-dimensional model data obtained by measuring the tooth model T using the intraoral scanner 2, but this is not limited to this, and the three-dimensional model data may be obtained using an intraoral scanner other than the intraoral scanner 2 connected to the device main body 3 or a fixed scanner, or may be three-dimensional model data showing teeth used when conducting dental training in a virtual space. In the case of three-dimensional model data used when conducting dental training in a virtual space, cavity formation portion 39a of example model 39 and cavity formation portion 40a of formation model 40 are cavities formed in the virtual space.

[0135] In addition, the uncut model 38, the model model 39 and the formation model 40 are stored in the memory unit 35 of the dental training evaluation device 1, but this is not limited to this and they may also be stored in a server or an external storage device connected via a communication line.

[0136] Furthermore, the processing operations of the evaluation program 37, the processing operations of the reference data generation processing, and the processing operations of the evaluation target data generation processing are only examples, and are not limited to the above-mentioned embodiments as long as the overlapping portions 39b, 40b that overlap the uncut model 38 are removed to extract the cavity formation portions 39a, 40a, and the formation model 40 is evaluated based on the extracted cavity formation portions 39a, 40a.

[0137] In addition, the menu screen 200, the first evaluation result screen 210, and the second evaluation result screen 220 in the above-mentioned embodiment are merely examples, and are not limited to these. For example, the name and student ID number of the trainee may be input on the menu screen 200.

[0138] In addition, in step S122 of Figure 7, in order to detect the mesh plane 391 of the model model 39 having the shortest three-dimensional distance L to the center of gravity G1 of the uncut model 38, the three-dimensional distance L from one center of gravity G1 of the uncut model 38 to all centers of gravity G2 of the model model 39 is calculated, but this is not limited to this.

[0139] Similarly, in order to detect the mesh plane of the formed model 40 which has the shortest three-dimensional distance L to the center of gravity G1 of the uncut model 38, the three-dimensional distance from one center of gravity G1 of the uncut model 38 to all centers of gravity of the formed model 40 was calculated, but this is not limited to this.

[0140] For example, one or more mesh planes 391 of the example model 39 facing one mesh plane 381 of the uncut model 38 are extracted, and the three-dimensional distance L to the center of gravity G2 of the extracted mesh plane 391 is calculated. Then, of the calculated three-dimensional distances L, the mesh plane 391 of the example model 39 with the shortest three-dimensional distance L may be extracted as the detection target.

[0141] Alternatively, a virtual line may be set along the normal direction passing through the center of gravity G1 of one of the mesh planes 381 of the uncut model 38, and one of the mesh planes 391 of the model model 39 that intersects with the virtual line may be determined as the mesh plane 391 with the shortest three-dimensional distance L.

[0142] In step S109 in FIG. 4, the position coordinates of the center of gravity on the mesh plane of the reference data 50 and the position coordinates of the center of gravity on the mesh plane of the evaluation target data 60 are calculated, but this is not limiting.

[0143] For example, in the reference data generation process of step S107 in FIG. 4, the position coordinates of the center of gravity of the mesh plane are stored when generating the reference data 50, and in the evaluation target data generation process of step S108 in FIG. 4, the position coordinates of the center of gravity of the mesh plane are stored when generating the evaluation target data 60. Then, in step S109 of FIG. 4, the stored position coordinates of the center of gravity of the reference data 50 and the position coordinates of the center of gravity of the evaluation target data 60 may be read out to carry out the subsequent processes.

[0144] In addition, in step S109 of FIG. 4, the percentage of the divided area of ​​the excess-cutting portion 60a to the total area of ​​the excess-cutting portion 60a was calculated, but this is not limited to this, and the percentage of the excess-cutting portion 60a in the distance section may be any appropriate percentage.

[0145] For example, it may be the ratio of the area of ​​the over-cutting portion 60a to the total area of ​​the evaluation target data 60. Alternatively, it may be the ratio of the number of point clouds of the over-cutting portion 60a in the distance section to the total number of point clouds of the evaluation target data 60.

[0146] Similarly, the ratio of the divided area of ​​the insufficient cutting portion 60b to the total area of ​​the insufficient cutting portion 60b was calculated, but this is not limited to this, and the ratio of the divided area of ​​the insufficient cutting portion 60b to the total area of ​​the evaluation target data 60 may also be used. Alternatively, it may be the ratio of the number of point clouds of the insufficient-cutting portion 60b within the distance section to the total number of point clouds of the insufficient-cutting portion 60b or the total number of point clouds of the evaluation target data 60.

[0147] In addition, in step S109 of FIG. 4, the over-cut portion 60a and the under-cut portion 60b are each scored based on the correspondence between the predetermined over-cut area ratio and under-cut area ratio and the score, but this is not limited to this. For example, the cavity shape offset amount of the over-cut portion 60a and the cavity shape offset amount of the under-cut portion 60b may each be scored. [Explanation of symbols]

[0148] 1. Dental training evaluation device 2. Intraoral scanner 31...Display section 36...Control section 37...Evaluation Program 38…Uncut model 39...Model 39b...polymerization part 40…Formation model 40b...polymerization part 50…Standard data 60...Data to be evaluated 60a…Excessive cutting area 60b…Insufficient cutting part 381…Mesh plane 391…Mesh plane G1…center of gravity G2…Center of gravity L…Three-dimensional distance

Claims

1. A dental practice evaluation device for evaluating a cavity shape in a dental practice, an acquisition means for acquiring an uncut model showing an uncut tooth, a model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed therein by a trainee; a reference data generating means for generating reference data by deleting an overlapping portion of the example model that overlaps with the uncut model; an evaluation data generating means for generating evaluation target data by deleting an overlapping portion of the formed model that overlaps with the uncut model; an evaluation means for evaluating the evaluation target data based on the reference data; Dental practice evaluation device.

2. The reference data generating means and the evaluation data generating means The overlapping portion that overlaps the uncut model within a predetermined range is deleted. The dental training evaluation device according to claim 1 .

3. the uncut model, the example model and the forming model are composed of three-dimensional model data of polygon meshes; The predetermined range is based on the length of a line segment that linearly connects the centers of gravity of the mesh plane. The dental training evaluation device according to claim 2.

4. The evaluation means includes: A cutting-insufficient portion where cutting is insufficient with respect to the reference data and a cutting-excessive portion where cutting is excessive with respect to the reference data are extracted from the evaluation target data, and an output means for visually displaying the undercut portion and the overcut portion extracted by the evaluation means on the forming model. The dental training evaluation device according to claim 1 .

5. A portion of the evaluation target data that is insufficiently cut with respect to the reference data is defined as an insufficient cut portion, and a portion of the evaluation target data that is excessively cut with respect to the reference data is defined as an excessive cut portion, The evaluation means includes: a ratio of the insufficient cutting portion and a ratio of the excessive cutting portion are calculated for each distance section obtained by dividing a distance from the reference data into predetermined intervals, A display means is provided for displaying a distribution of the proportion of the undercut portion and a distribution of the proportion of the overcut portion together with the formation model. The dental training evaluation device according to claim 1 .

6. A dental practice evaluation program for evaluating a cavity shape in a dental practice, comprising: an acquisition step of acquiring an uncut model showing an uncut tooth, a model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed therein by a trainee; a reference data generating step of generating reference data by deleting an overlapping portion of the example model that overlaps with the uncut model; an evaluation data generating step of generating evaluation target data by deleting an overlapping portion of the formed model that overlaps with the uncut model; and performing an evaluation step of evaluating the evaluation target data based on the reference data. Dental practice assessment program.

7. A dental practice evaluation method for evaluating a cavity shape in a dental practice, comprising: an acquisition step in which an acquisition means acquires an uncut model showing an uncut tooth, a model showing a tooth with a model cavity formed therein, and a formed model showing a tooth with a cavity formed therein by a trainee; a reference data generating step in which a reference data generating means generates reference data by deleting an overlapping portion of the example model that overlaps with the uncut model; an evaluation data generating step in which evaluation data generating means generates evaluation target data by deleting an overlapping portion of the formed model that overlaps with the uncut model; An evaluation step in which an evaluation means evaluates the evaluation target data based on the reference data. Dental practice evaluation methods.

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