Method for modifying a shape of a tooth model, device for modifying a shape of a tooth model, and computer-readable recording medium having a program recorded thereon for causing a computer to execute the method for modifying a shape of a tooth model

Abstract

To provide a method of deforming the shape of a tooth model, which allows a user to change an overall shape of the tooth model through simple manipulation using a multiple shape deformation method and a mesh blending method.SOLUTION: A method of deforming the shape of a tooth model is provided, comprising generating a plurality of deformation shape models by deforming a tooth template model according to tooth scan data, and generating a blended shape model by performing mesh blending on the deformation shape models.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for deforming a shape of a tooth model, a device for deforming a shape of a tooth model, and a computer-readable recording medium having recorded thereon a program for causing a computer to execute the method for deforming a shape of a tooth model, and more particularly to a method for deforming a shape of a tooth model using multiple shape deformation and mesh blending techniques, a device for deforming a shape of a tooth model, and a computer-readable recording medium having recorded thereon a program for causing a computer to execute the method for deforming a shape of a tooth model. [Background technology]

[0002] Among computer-aided 3D modeling methods, parametric modeling is a method of creating a complete model using mathematically defined feature objects. This method has the advantage of facilitating interaction between the user and the 3D model. For example, to create a hexahedron, nodes are defined, a 2D rectangle surrounded by multiple straight lines is created, and then the rectangle is extracted in the normal direction to complete a hexahedron.

[0003] 3D scanning is a process of obtaining a mesh data structure with a large number of nodes and their connections using optical or contact methods to turn a real object into a 3D object that a computer can recognize. Currently, 3D scanning is widely used in various industrial fields. In particular, in the digital dentistry market, 3D scanning and its results are widely used to improve productivity since the shapes and arrangements of teeth owned by each user are all different. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a method for modifying the shape of a tooth model, which allows a user to change the overall shape with a simple operation, by using a multiple shape modification and mesh blending technique.

[0005] Another object of the present invention is to provide a tooth model shape deformation device for performing the tooth model shape deformation method.

[0006] It is still another object of the present invention to provide a computer-readable recording medium having recorded thereon a program for causing a computer to execute the tooth model shape modification method. [Means for solving the problem]

[0007] In one embodiment of the present invention, a method for deforming a tooth model shape includes the steps of: deforming a tooth template model based on tooth scan data to generate a plurality of deformed shape models; and mesh blending the deformed shape models to generate a blended shape model.

[0008] The method further includes the steps of receiving parameters input by a user and deforming the blend shape model based on the parameters.

[0009] Of the deformed shape models, a detailed shape of a second deformed shape model is more complex than a detailed shape of a first deformed shape model of the deformed shape models.

[0010] The first deformed shape model has sides that match sides of the dental scan data and has a top surface where the detail is minimized.

[0011] The second deformed shape model has sides that match sides of the dental scan data and has a top surface that has detailed geometry of the top surface of the dental template model.

[0012] The second deformed shape model has sides that match sides of the dental scan data and has a top surface that has detailed geometry of a top surface of the dental scan data.

[0013] The second deformed shape model has sides that match the sides of the tooth scan data and has a top surface that combines top surface details of the tooth template model and top surface details of the tooth scan data.

[0014] The method further includes a step of receiving parameters input by a user, the parameters including a first parameter indicating which of the first deformed shape model and the second deformed shape model the blend shape model is closer to, and a second parameter indicating which of the detail shape of the top surface of the second deformed shape model is closer to, the detail shape of the opposing side of the tooth template model and the detail shape of the top surface of the tooth scan data.

[0015] The step of generating a plurality of deformed shape models includes the steps of: JPEG0007603337000001.jpg9170 Satisfy.

[0016] The dual problem of a first deformed shape model among the deformed shape models is the same as the dual problem of a second deformed shape model among the deformed shape models.

[0017] The dual problem of the first deformed shape model and the second deformed shape model represents the locations of dental feature points.

[0018] The dental feature points are at least one of buccal cusp, lingual cusp, facial occlusal, lingual occlusal, grooves, marginal ridge, and contact.

[0019] The main problem of the first deformation model is JPEG0007603337000002.jpg7170 and the main problem of the second deformable shape model is JPEG0007603337000003.jpg5170 and the dual problem of the first deformed shape model and the second deformed shape model is JPEG0007603337000004.jpg7170 When JPEG0007603337000005.jpg9170 and JPEG0007603337000006.jpg10170 Satisfy.

[0020] Among the deformed shape models, a mesh connectivity relationship of a first deformed shape model is the same as a mesh connectivity relationship of a second deformed shape model among the deformed shape models.

[0021] The first deformed shape model JPEG0007603337000007.jpg6170 and the second deformed shape model is JPEG0007603337000008.jpg6170 and the parameters input by the user are JPEG0007603337000009.jpg5170 and the blend shape model is JPEG0007603337000010.jpg7170 When JPEG0007603337000011.jpg7170 Satisfy.

[0022] According to an embodiment of the present invention, an apparatus for transforming a tooth model includes a deformed shape model generator and a shape blender. The deformed shape model generator generates a plurality of deformed shape models by transforming a tooth template model based on tooth scan data. The shape blender mesh-blends the deformed shape models to generate a blended shape model.

[0023] A program for causing a computer to execute the tooth model shape modification method is recorded in a computer-readable recording medium. Effect of the Invention

[0024] According to the tooth model shape transformation method and device of the present invention, a tooth template model is transformed based on tooth scan data to generate a plurality of transformed shape models, and the plurality of transformed shape models are blended by a mesh blending method to obtain a final shape model desired by a user. In addition, the blend shape can be easily changed by a simple feedback operation by the user. In addition, the post-processing work after the shape transformation can be reduced.

[0025] The tooth scan data is captured by a scanner, and the mesh has a low degree of completion, which is relatively low and therefore unsuitable for manufacturing prostheses, implants, orthodontics, etc., by 3D printing. In contrast, the tooth template model is a tooth model with a relatively high degree of mesh completion. Therefore, when manufacturing prostheses, implants, orthodontics, etc., by modifying the tooth template model, it is very suitable to use the 3D printing method. In this way, when the tooth template model is deformed to be closer to the tooth scan data, the manufacturing time of prostheses, implants, orthodontics, etc. can be reduced, the manufacturing process can be shortened, and the quality can be improved. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a flowchart showing a method for modifying the shape of a tooth model according to an embodiment of the present invention. [Figure 2a] FIG. 2a shows an example of a dental template model. [Figure 2b] FIG. 2b shows an example of dental scan data. [Figure 2c]FIG. 2c is a diagram showing an example of a deformed shape model obtained by deforming the tooth template model of FIG. 2a based on the tooth scan data of FIG. 2b. [Figure 2d] FIG. 2d shows a simultaneous visualization of the deformed shape model of FIG. 2c and the dental scan data of FIG. 2b. [Figure 3a] FIG. 3a shows an example of a dental template model. [Figure 3b] FIG. 3b shows an example of dental scan data. [Figure 3c] FIG. 3c is a diagram showing a first deformed shape model obtained by deforming the tooth template model of FIG. 3a based on the tooth scan data of FIG. 3b. [Figure 3d] FIG. 3d is a diagram showing a second deformed shape model obtained by deforming the tooth template model of FIG. 3a based on the tooth scan data of FIG. 3b. [Figure 4] FIG. 4 is a diagram showing an example of feature points of teeth. [Diagram 5] FIG. 5 is a diagram showing an example of a user interface of the user input step of FIG. [Figure 6] FIG. 6 is a diagram showing an example of a user interface of the user input step of FIG. [Figure 7a] FIG. 7a shows an example of a blend shape according to user parameters. [Figure 7b] FIG. 7b shows an example of blend shapes according to user parameters. [Figure 7c] FIG. 7c shows an example of a blend shape according to user parameters. [Figure 7d] FIG. 7d shows an example of blend shapes according to user parameters. [Figure 8a] FIG. 8a is a diagram showing an example of blend shapes according to user parameters. [Figure 8b] FIG. 8b shows an example of blend shapes according to user parameters. [Figure 8c] FIG. 8c shows an example of a blend shape according to user parameters. [Figure 8d] FIG. 8d shows an example of blend shapes according to user parameters. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] With respect to the embodiments of the present invention set forth herein, specific structural or functional descriptions are merely exemplary for purposes of describing the embodiments of the present invention, and the example embodiments of the present invention may be embodied in various forms and should not be construed as being limited to the embodiments set forth herein.

[0028] The present invention can be modified in various ways and can have various forms, and specific embodiments are shown by way of example in the drawings and will be described in detail herein, but it is to be understood that this is not intended to limit the invention to the specific disclosed forms, but rather to include all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0029] Terms such as "first" and "second" are used to describe various components, but the components should not be limited by the terms. The terms are used only to distinguish one component from another. For example, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component, without departing from the scope of the present invention.

[0030] When an element is said to be "coupled" or "connected" to another element, it should be understood that it may be directly coupled or connected to the other element, but there may also be other elements in between. On the other hand, when an element is said to be "directly coupled" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions describing the relationship between elements, such as "between" and "immediately between," or "adjacent to" and "directly adjacent to," should be interpreted similarly.

[0031] The terms used in this application are merely used to describe certain embodiments and are not intended to limit the present invention. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preclude the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0032] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and not as being idealized or overly formal, unless expressly defined in this application.

[0033] However, when an embodiment can be implemented differently, the functions or acts specified in a particular block may occur differently from the sequence specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, or the blocks may be performed in reverse depending on the functions or acts involved.

[0034] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same components in the drawings are designated by the same reference numerals, and duplicated descriptions of the same components will be omitted.

[0035] FIG. 1 is a flowchart showing a method for modifying the shape of a tooth model according to an embodiment of the present invention.

[0036] As shown in Fig. 1, the tooth model shape deformation method includes the steps of: deforming a tooth template model based on tooth scan data to generate a plurality of deformed shape models, and mesh blending the deformed shape models to generate a blended shape model. The tooth model shape deformation method further includes the steps of receiving parameters input by a user, and deforming the blended shape models based on the parameters.

[0037] The method for modifying the shape of a tooth model in this embodiment is performed by a computing device.

[0038] For example, the tooth scan data is 3D tooth scan data. The tooth scan data refers to data obtained by scanning teeth and an oral cavity, or an object that imitates or reconstructs the teeth and an oral cavity, with a 3D scanner. In dental treatments such as prosthetic treatments such as inlays, onlays, and crowns, implants, and orthodontics, oral cavity data of a patient is acquired and used for designing prosthetics or implants, manufacturing orthodontic appliances, etc.

[0039] For example, the tooth scan data is mesh data including 3D points (Vertex) and triangles or rectangles generated by connecting the points. There is no limitation on the file extension of the 3D scan data, and it can be any one of ply, obj, and stl.

[0040] Here, the dental scan data is not limited to scan data including only teeth, but may also include other body parts in addition to teeth.

[0041] The tooth template model is a kind of sample tooth (standard tooth) used for manufacturing prostheses, implants, orthodontics, etc., and has a typical tooth shape. The tooth template model has one sample tooth (standard tooth) for each tooth number. The tooth scan data is taken by a scanner and has a relatively low degree of mesh perfection, and when the mesh perfection is low, it is not suitable for manufacturing prostheses, implants, orthodontics, etc. by 3D printing. On the other hand, the tooth template model is a tooth model with a relatively high degree of mesh perfection. Therefore, when manufacturing prostheses, implants, orthodontics, etc. by modifying the template model, it is very suitable for using the 3D printing method.

[0042] Mesh Deformation is a technique that moves the remaining nodes by interacting with a few nodes for general mesh data that has a large number of nodes. Deformable Registration is a technique that transforms an input model into another target model through shape deformation and matching between nodes.

[0043] In addition, mesh blending technology is a technology that mixes two shapes with the same structure to create a new model.

[0044] In the present invention, when shape deformation is performed on input tooth scan data based on a dental template model, a plurality of deformed shapes are internally calculated as shown in Fig. 1, so that a user can easily handle the blend shape. For example, the plurality of deformed shape models include N deformed shape models. As shown in Fig. 1, the plurality of deformed shape models include a first deformed shape model, a second deformed shape model, ..., an Nth deformed shape model.

[0045] Fig. 2a shows an example of a tooth template model, Fig. 2b shows an example of tooth scan data, Fig. 2c shows an example of a deformed shape model obtained by deforming the tooth template model of Fig. 2a based on the tooth scan data of Fig. 2b, Fig. 2d shows a simultaneous visualization of the deformed shape model of Fig. 2c and the tooth scan data of Fig. 2b.

[0046] Referring to Figures 1 to 2d, Figure 2a shows an example of a tooth template model, Figure 2b shows an example of tooth scan data, and Figure 2c shows an example of a deformed shape model obtained by deforming the tooth template model of Figure 2a based on the tooth scan data of Figure 2b.

[0047] In Fig. 2c, the deformed shape model is deformed from the tooth template model to have the shape of the tooth scan data, and as shown in Fig. 2d, the deformed shape model generated by deforming the tooth template model has a shape very similar to the shape of the tooth scan data.

[0048] The deformed shape model does not necessarily have to have the same shape as the dental scan data, but can be deformed in various ways.

[0049] Fig. 3a is an example of a tooth template model; Fig. 3b is an example of tooth scan data; Fig. 3c is a first deformed shape model obtained by deforming the tooth template model of Fig. 3a based on the tooth scan data of Fig. 3b; and Fig. 3d is a second deformed shape model obtained by deforming the tooth template model of Fig. 3a based on the tooth scan data of Fig. 3b.

[0050] Referring to Figures 1 to 3d, Figure 3a shows an example of a tooth template model, Figure 3b shows an example of tooth scan data, Figure 3c shows a first deformed shape model obtained by deforming the tooth template model of Figure 3a based on the tooth scan data of Figure 3b, and Figure 3d shows a second deformed shape model obtained by deforming the tooth template model of Figure 3a based on the tooth scan data of Figure 3b.

[0051] In this embodiment, a tooth template model can be deformed based on the tooth scan data to generate multiple deformed shape models, for example, a first deformed shape model is a shape model in which the detailed shape is minimized, and a second deformed shape model is a shape model in which the detailed shape is maximized.

[0052] A user selects an appropriate blend shape model desired by the user between the first deformed shape model in which the detailed shape is minimized and the second deformed shape model in which the detailed shape is maximized. The user selects a blend shape model desired by the user through initial setting, and can deform the blend shape model through feedback input even after the blend shape model is primarily formed.

[0053] For example, a user may generate a shape model having a detailed shape closest to a target model for forming a prosthesis, etc. Alternatively, a user may generate a shape model in which detailed shapes are minimized for ease of correction work, etc.

[0054] As shown in FIGS. 3c and 3d, a detailed shape of a second deformed shape model among the deformed shape models is more complex than a detailed shape of a first deformed shape model among the deformed shape models.

[0055] As shown in FIG. 3c, the first deformed shape model has sides that match the sides of the dental scan data and a top surface where the detail is minimized.

[0056] As shown in FIG. 3d, the second deformed shape model has sides that match the sides of the dental scan data and has a top surface that has the detailed shape of the top surface of the dental template model.

[0057] Alternatively, the second deformed shape model has sides that correspond to sides of the dental scan data and has a top surface that has detailed features of the top surface of the scan data.

[0058] Alternatively, the second deformed shape model may have sides that match the sides of the tooth scan data and a top surface that combines the details of the top surface of the tooth template model and the details of the top surface of the tooth scan data.

[0059] Fig. 4 is a diagram showing an example of tooth feature points. Fig. 5 is a diagram showing an example of a user interface in the user input step in Fig. 1. Fig. 6 is a diagram showing an example of a user interface in the user input step in Fig. 1.

[0060] Referring to FIGS. 1 to 6, the shape deformation method is carried out using an optimization problem such as Equation 1.

[0061] JPEG0007603337000012.jpg9170

[0062] The solution of this optimization problem is the primal principle that determines the position of each vertex. Depending on the definition and implementation principle of the optimization problem, it is possible to obtain other shapes having the same topology as shown in Figures 3c and 3d using the same data. Specifically, this optimization problem is divided into a primal (f(x)) problem and a dual (g(x)) problem. The primal problem is applied uniformly to all vertices of the mesh model, providing a global shape adjustment principle. The dual problem allows the mesh model to be adjusted directly.

[0063] In the case of tooth models, there are feature points that are considered important in anatomical analysis and dental prosthesis shape design in the dental field, as shown in Figure 4. The positions of such feature points can be specified through prediction by deep learning, matching with a reference model, feature point extraction in the reference model, etc. The feature points with the specified positions can be set as the dual problem of the optimization problem mentioned above.

[0064] Here, the main problem can be set in a way that softens the overall shape (FIG. 3c) or preserves the local features of the original template shape (FIG. 3d). Thus, in different main problems, two optimization problems with different expected results can be set that share the same dual problem, as in Equation 2 and Equation 3. When the shape is deformed to the vertex positions obtained by solving the optimization problem, different results can be obtained, as shown in FIG. 3c and FIG. 3d.

[0065] For example, the dual problem of a first deformed shape model among the deformed shape models is the same as the dual problem of a second deformed shape model among the deformed shape models. For example, the dual problem of the first deformed shape model and the second deformed shape model represent the positions of dental feature points (FIG. 4). For example, the dental feature points are at least one of buccal cusp, lingual cusp, facial occlusal, lingual occlusal, grooves, marginal ridge, and contact.

[0066] The main problem of the first deformation model is JPEG0007603337000013.jpg7170 and the main problem of the second deformable shape model is JPEG0007603337000014.jpg7170 and the dual problem of the first deformed shape model and the second deformed shape model is JPEG0007603337000015.jpg8170 Then, the following formulas 2 and 3 are satisfied.

[0067] JPEG0007603337000016.jpg9170

[0068] JPEG0007603337000017.jpg10170

[0069] The connection relationships between the vertices are the same as described above, but the detailed shapes are different. However, it is difficult to determine that either of the two shapes is the shape desired by the user. The user may determine that the detailed shape of the template model is too strongly preserved, or that the shape itself has too much smoothing. In order to obtain the desired result, the user may try to easily adjust and determine the intermediate results through feedback control of parameters. Therefore, a parameter adjustment UI as shown in FIG. 5 can be provided to the user so that instant and quick feedback control can be performed. As described above, since the two meshes (the first deformed shape model and the second deformed shape model) have the same connection relationships, the blended shape can be calculated for each vertex through the following LERP (Linear Interpolation) equation (Equation 4).

[0070] JPEG0007603337000018.jpg8170

[0071] Here, the first deformed shape model is JPEG0007603337000019.jpg7170 and the second deformed shape model is JPEG0007603337000020.jpg6170 and the parameters input by the user are JPEG0007603337000021.jpg6170 and the blend shape model is JPEG0007603337000022.jpg7170 It is.

[0072] The parameters provided in Figure 5 are taken as the param values ​​provided in Equation 4. The parameters indicate whether the blended shape model is closer to the first deformed shape model or the second deformed shape model.

[0073] In the mesh blending method, in addition to LERP, various other methods can be applied based on the principle of multiple shape transformation, such as SLERP (Spherical Linear Interpolation) and interpolation between different topology meshes.

[0074] As mentioned above, the top surface detail of the second deformed shape model may have a top surface that is a combination of the top surface detail of the tooth template model and the top surface detail of the tooth scan data.

[0075] In this case, as shown in FIG. 6, the parameters input by the user further include a second parameter indicating which of the detailed shape of the top surface of the second deformed shape model is closer to, the detailed shape of the top surface of the tooth template model or the detailed shape of the top surface of the tooth scan data.

[0076] For example, for generating prostheses, it is advantageous to have a shape close to the detailed shape of the tooth template model, whereas for use as learning data for artificial intelligence, it is advantageous to have a shape close to the detailed shape of the tooth scan data, which is the actual shape of natural teeth.

[0077] 7a-7d and 8a-8d are diagrams showing examples of blend shapes according to user parameters.

[0078] Here, the first deformed shape model is a shape model in which detail shape is minimized, and the second deformed shape model is a shape model in which detail shape is maximized, and the parameters indicate which of the first deformed shape model and the second deformed shape model the blended shape model is closer to.

[0079] 7a and 8a, when the parameter has a minimum value (e.g., 0), the blended shape is the same as the first deformed shape model, i.e., the blended shape is a shape model with minimized detail shapes.

[0080] As shown in Figures 7d and 8d, when the parameter has a maximum value (e.g., 1), the blended shape is identical to the second deformed shape model, i.e., the blended shape is the shape model with maximized detail shape.

[0081] As shown in Figs. 7b and 8b, a case is illustrated in which the blended shape has a shape closer to the first deformed shape model among the first deformed shape model and the second deformed shape model.

[0082] As shown in FIG. 7c and FIG. 8c, a case is illustrated in which the blended shape has a shape closer to the second deformed shape model out of the first deformed shape model and the second deformed shape model.

[0083] According to this embodiment, a tooth template model is deformed based on tooth scan data to generate multiple deformed shape models, and the multiple deformed shape models are blended using a mesh blending method to obtain a final shape model desired by a user. In addition, the blend shape can be easily changed through a simple feedback operation by the user. In addition, post-processing work after shape transformation can be reduced.

[0084] The tooth scan data is captured by a scanner, and the mesh has a low degree of completion, which is not suitable for manufacturing prostheses, implants, orthodontics, etc., by 3D printing. On the other hand, the tooth template model is a tooth model with a relatively high degree of mesh completion. Therefore, when manufacturing prostheses, implants, orthodontics, etc., by modifying the tooth template model, it is very suitable for using the 3D printing method. In this way, when the tooth template model is deformed to be closer to the tooth scan data, the manufacturing time of prostheses, implants, orthodontics, etc. can be reduced, the manufacturing process can be shortened, and the quality of the prostheses, implants, orthodontics, etc. can be improved.

[0085] According to an embodiment of the present invention, a computer-readable recording medium is provided having a program recorded thereon for executing the tooth model shape modification method according to the embodiment on a computer. The method can be created by a program executed by a computer, and can be embodied in a general-purpose digital computer that runs the program using the computer-readable medium. In addition, data structures used in the method are recorded on the computer-readable medium through a number of means. The computer-readable medium can include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specifically designed and constructed for the present invention, or those that are known and usable by those of ordinary skill in the computer software field. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magnetic-optical media such as protocol disks, and hardware devices specifically configured to store and execute program instructions, such as ROMs, RAMs, flash memories, and the like. The program instructions include not only machine language codes, such as those created by a compiler, but also high-level language codes executed by a computer using an interpreter, and the like. The hardware devices described above are configured to operate as one or more software modules to perform the operations of this invention.

[0086] The above-described method for modifying the shape of a tooth model may also be embodied in the form of a computer program or application that is stored in a recording medium and executed by a computer. [Industrial Applicability]

[0087] The present invention relates to a method for deforming the shape of a tooth model, an apparatus for deforming the shape of a tooth model, and a computer-readable recording medium having recorded thereon a program for causing a computer to execute the method for deforming the shape of a tooth model, which can reduce the manufacturing time of prostheses, implants, orthodontics, etc., shorten the manufacturing process, and improve quality.

[0088] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will appreciate that various modifications and variations of the present invention may be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. deforming the tooth template model based on the tooth scan data to generate a plurality of deformed shape models; mesh blending the deformed shape model to generate a blended shape model; 13. A method for deforming a shape of a tooth model, comprising:

2. Further, receiving parameters input by a user; and deforming the blend shape model based on the parameters. A method for deforming a shape of a tooth model according to claim 1.

3. a detailed shape of a second deformed shape model among the deformed shape models is more complex than a detailed shape of a first deformed shape model among the deformed shape models; A method for deforming a shape of a tooth model according to claim 1.

4. the first deformed shape model has side surfaces that correspond to side surfaces of the dental scan data and has a top surface where the detail is minimized. The method for deforming a shape of a tooth model according to claim 3.

5. the second deformed shape model has sides that correspond to sides of the dental scan data and has a top surface that has detailed features of a top surface of the dental template model. The method for deforming a shape of a tooth model according to claim 3.

6. the second deformed shape model has sides that correspond to sides of the dental scan data and has a top surface that has detailed features of a top surface of the dental scan data. The method for deforming a shape of a tooth model according to claim 3.

7. the second deformed shape model has side surfaces that correspond to side surfaces of the tooth scan data and has a top surface that is a combination of a top surface detail of the tooth template model and a top surface detail of the tooth scan data. The method for deforming a shape of a tooth model according to claim 3.

8. Further comprising the step of receiving user input parameters; The parameters are: a first parameter indicative of whether the blended shape model is closer to the first deformed shape model or the second deformed shape model; and a second parameter indicating which of the detailed shape of the top surface of the second deformed shape model is closer to, the detailed shape of the top surface of the tooth template model or the detailed shape of the top surface of the tooth scan data. The method for deforming a shape of a tooth model according to claim 7.

9. The step of generating a plurality of deformed shape models includes the steps of: The present invention is characterized in that A method for deforming a shape of a tooth model according to claim 1.

10. 10. The method for deforming a tooth model according to claim 9, wherein the dual problem of a first deformed shape model among the deformed shape models is identical to the dual problem of a second deformed shape model among the deformed shape models.

11. The method of claim 10, wherein the dual problem between the first deformed shape model and the second deformed shape model represents positions of tooth feature points.

12. 12. The method of claim 11, wherein the tooth feature points are at least one of a buccal cusp, a lingual cusp, a facial occlusal, a lingual occlusal, grooves, a marginal ridge, and a contact.

13. The main problem of the first deformed shape model is and the main problem of the second deformable shape model is and the dual problem of the first deformed shape model and the second deformed shape model is When and The present invention is characterized in that The method for deforming a tooth model according to claim 11.

14. a mesh connectivity relationship of a first deformed shape model among the deformed shape models is the same as a mesh connectivity relationship of a second deformed shape model among the deformed shape models. A method for deforming a shape of a tooth model according to claim 1.

15. The first deformed shape model and the second deformed shape model is and the parameters input by the user are and the blend shape model is When 15. The method for deforming a tooth model shape according to claim 14, wherein the following is satisfied:

16. a deformed shape model generating unit for generating a plurality of deformed shape models by deforming a tooth template model based on the tooth scan data; a shape blender that mesh-blends the deformed shape model to generate a blended shape model.

17. A computer-readable recording medium having a program recorded thereon for causing a computer to execute the method according to any one of claims 1 to 15.

Images