KR101953341B1 - Crown digital design method for processing overlapped region, apparatus, and recording medium thereof - Google Patents

Abstract

The present invention relates to a crown digital designing method for processing an overlapping part, to an apparatus for the same, and to a recording medium recording the same. According to the present invention, the crown digital designing method is performed by connecting a process of removing a part of a virtual crown with a process of curving the surface of the virtual crown when processing an overlapping part of the virtual crown and adjacent teeth. Through the processing, additional work by a user after the processing of the overlapping part is minimized, and thus the convenience of the user can be greatly enhanced and the time required for a design process can be effectively shortened. Moreover, a more natural tooth shape can be realized, and thus the procedure satisfaction of a patient can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crown digital design method for a superimposed part process, an apparatus therefor, and a recording medium on which the crown digital design method,

The present invention relates to a crown digital designing method, an apparatus therefor, and a recording medium on which the crown digital designing method is performed. More particularly, the present invention relates to a crown digital designing method for replacing a damaged tooth, A method for designing the apparatus, an apparatus therefor, and a recording medium on which the apparatus is recorded.

In recent years, dental CAD programs have been widely used in the design of implants and crowns to replace injured teeth in order to manufacture more appropriate and sophisticated prostheses for patients.

The dental CAD program provides various convenience functions to the user to produce more suitable results for the patient. One of them, the adaptation function, is a function that, when the crown model collides with the adjacent value or the matching value, The value is used to adjust the degree of collision by modifying the tooth model.

As described above, the adjustment function is provided so that the user can easily adjust the overlap degree or distance between the crown model and the adjacent tooth or the opposite tooth. However, the adjustment function provided by the conventional dental CAD program is not only troublesome to the user, It also reveals many limitations in terms of effectiveness.

FIG. 1 schematically shows an example of an adjustment function provided by a conventional dental CAD program.

Referring to FIG. 1, assuming that crown B is deformed so that A and B are in contact with each other while a crown B being designed and a part of adjacent tooth A adjacent thereto are overlapped with each other, adjustment function according to a conventional CAD program is applied The region (a) overlapping with A in B is deleted. According to this, as shown in Fig. 1, sharp edges (e1, e2) appear at the edge of B where the adjustment function is applied.

As described above, according to the conventional dental CAD program, since a separate smoothing operation for smoothing the edge portion after the adjustment function is applied, it is troublesome to the user, and even if the smooth operation is performed, There are many difficulties. This not only delays the prosthetic design process but also affects the patient 's satisfaction with the procedure.

The present invention has been proposed in order to solve the problems of the prior art in which there is a limitation in the design of a natural tooth shape, which causes troubles to the user accompanied by a separate smoothing operation for trimming the edge portion after applying the crown model adjusting function A crown digital designing method capable of obtaining natural results while minimizing user's additional work after applying the adjustment function, an apparatus therefor, and a recording medium storing the same.

A crown digital designing method according to an embodiment of the present invention is a crown digital designing method in which each step is performed through a computer, comprising the steps of: creating a virtual crown on a tooth array image of a patient; Determining a point of contact that is a point on a surface of an adjacent tooth overlaid with the virtual crown; Removing a portion of the virtual crown that overlaps the adjacent tooth in a first region included in a predetermined radius based on the contact point; And curving the surface of the virtual crown included in the second area connected to the first area.

Here, the step of removing a portion of the virtual crown may remove a portion of the virtual crown so that the virtual crown and the adjacent tooth are in surface contact with each other in the first region.

The second region may be a region extending from a boundary of the first region to a boundary spaced by a predetermined distance from an intersection line formed by the virtual crown and the adjacent tooth.

The step of curving the surface of the virtual crown may include the steps of: deriving a plurality of curve starting points on the virtual crown that are spaced apart from the intersection line formed by the virtual crown and the adjacent tooth by a predetermined distance; Deriving a plurality of curve end points on the virtual crown at a boundary of the first region; Generating a tangent through each of the plurality of curve starting points and the plurality of curve ending points; Generating a plurality of curves connecting the curve start point and the curve end point based on the derived tangent; And meshing the surface of the virtual crown based on the plurality of curves.

The crown digital designing method may further include moving the position of the adjacent tooth corresponding to a predetermined value of a parameter related to a final positional relationship between the virtual crown and the adjacent tooth before determining the contact point; And restoring the position of the adjacent tooth after curving the surface of the virtual crown.

In addition, the step of curving the surface of the virtual crown may be performed based on a Bezier curve algorithm.

According to another aspect of the present invention, there is provided a crown digital designing apparatus comprising: a crown generating unit for generating a virtual crown on a tooth array image of a patient; A contact point determining unit that determines a contact point that is a point on a surface of a neighboring tooth overlapped with the virtual crown; A crown remover for removing a portion of the virtual crown which overlaps with the adjacent tooth in a first region included in a predetermined radius based on the contact point; And a curving processing unit for curving the surface of the virtual crown included in the second area connected to the first area.

The contact point determination unit determines the contact point based on user input through the user interface unit or detects a point on the surface of the adjacent tooth where the virtual crown and the adjacent tooth are maximally overlapped, Can be determined.

As described above, according to the present invention, the additional work involved in applying the adjusting function in the crown design is minimized, thereby greatly increasing the user's convenience and shortening the time required for the designing process.

Further, according to the present invention, a more natural tooth shape can be realized, and the patient's treatment satisfaction can be improved.

1 is a view for explaining an example of an adjustment function provided by a conventional dental CAD program;
FIG. 2 is a block diagram showing a configuration of a crown digital designing apparatus according to an embodiment of the present invention; FIG.
FIG. 3 is a view for explaining the operation of the tooth position shifting unit of the crown digital designing apparatus of FIG. 1; FIG.
4 is a diagram for explaining the operation of the contact point determining unit of the crown digital designing apparatus of Fig. 1;
5 is a flowchart of a crown digital designing method according to an embodiment of the present invention;
FIGS. 6 to 8 are diagrams illustrating a process of removing a part of a virtual crown and a curving process; FIG. And
9 is a flowchart showing an example of a method of curving a surface of a virtual crown.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

The crown digital designing apparatus according to the present invention carries out a computer-aided design of a crown which is applied to a dental prosthesis such as a denture, an implant, or the like,

2 is a block diagram showing a configuration of a crown digital designing apparatus according to an embodiment of the present invention.

2, a crown digital designing apparatus 100 according to an embodiment of the present invention includes a user interface unit 10, a crown generating unit 20, a tooth position shifting unit 30, a contact point determining unit 40, A crown removing unit 50, and a curving processing unit 60.

The user interface unit 10 receives necessary information from a user and displays information. The user interface unit 10 includes input means for inputting information such as a mouse, a keyboard, a button, and a keypad, an input menu and a processing result, Display means for displaying the input / output information, a touch screen for providing input / output through a single device, and the like.

The crown generator 20 generates a virtual crown at a position where a crown is required, such as a region where a tooth has been lost, and arranges the virtual crown in a tooth array image of a patient. Here, the image in which the virtual crown is disposed means a two-dimensional or three-dimensional multi-dimensional image in which the patient's tooth arrangement appears, and the image acquisition apparatus such as CT, X-ray, MRI, tooth panorama image, (Not shown), as well as images generated through image processing such as reconstruction, registration, and segmentation.

The crown generator 20 may generate a virtual crown at a selected position through the user interface unit 10, but may automatically recognize a crown position through image processing and generate a virtual crown at the corresponding position. At this time, the virtual crowns may be located apart from adjacent adjacent teeth, but they may overlap each other. For reference, adjacent teeth may be not only the patient's natural teeth, but also other crowns that are designed, such as an artificial crown or a crown being designed for the patient.

The tooth position shifting unit 30, the contact point determining unit 40, the crown removing unit 50 and the curving processing unit 60, which will be described later, process the overlapping portion of the virtual crown when the adjacent teeth and the virtual crown are overlapped with each other And may be activated by a user's request through the user interface unit 10 or may be activated by recognizing whether the virtual crown and adjacent teeth overlap each other.

The tooth position shifting unit 30 shifts the position of the adjacent tooth corresponding to the value of the parameter applied when processing the overlap region between the virtual crown and the adjacent teeth. Here, the parameter relates to the positional relationship between the virtual crown and the adjacent tooth after the overlap area processing. The positional relationship between the virtual crown and adjacent teeth can be defined in three ways. That is, the virtual crown and adjacent teeth may have a positional relationship, a tangential relationship, and a superposing positional relationship, which do not overlap with each other, but are spaced apart from each other.

The tooth position shifting unit 30 moves the position of the adjacent tooth so as to satisfy the predetermined parameter value.

3 is a reference diagram for explaining the operation of the tooth position shifting unit 30. As shown in Fig.

Referring to FIG. 3, when the parameter D set as the first case is 0, that is, when the parameter value is set such that the virtual crown T2 and the adjacent tooth T1 come into contact with each other finally after the overlap area processing, As shown in FIG.

On the other hand, when the value of the parameter D is greater than 0, that is, when the parameter value is set such that the virtual crown T2 and the adjacent teeth T1 are finally located after the overlapping region processing, the tooth position shifting unit 30 The adjacent tooth T1 is moved to the right, which is the direction of approaching the virtual crown T2. Conversely, when the value of the parameter D is smaller than 0, that is, when the overlapping area is processed such that the virtual crown T2 and the adjacent tooth T1 overlap each other, the tooth position shifting unit 30 moves the adjacent tooth T1 And moves in the leftward direction away from the virtual crown (T2). At this time, the movement amount of the adjacent tooth can be determined according to the concrete value of the parameter D.

On the other hand, as described later, when the processing of the virtual crown is completed, the tooth position shifting unit 30 restores the adjacent tooth to its original position.

The contact point determination unit 40 determines a contact point that is one point on the surface of the adjacent tooth in a state where the position of the adjacent tooth is moved through the tooth position shifting unit 30. [

4 is a reference diagram for explaining an example of a contact point.

4, the contact point P means a point on the surface of the adjacent tooth T1 in the region where the adjacent tooth T1 and virtual crown T2 overlap each other. As an example of the contact point P, it can be a point on the surface of the adjacent tooth T1 at the portion where the adjacent tooth T1 and the virtual crown T2 are maximally overlapped, as shown in Fig.

At this time, the contact point may be determined as a point directly selected by the user through the user interface unit 10, or the contact point determining unit 40 may determine a point on the surface of the adjacent tooth where the virtual crown and the adjacent tooth are maximally overlapped And may determine its own contact point.

The crown removal unit 50 removes a portion of the virtual crown that overlaps the adjacent tooth in the first region included in the predetermined radius based on the determined contact point. According to this, a part of the virtual crown overlapping with the adjacent tooth is removed within a predetermined radius based on the contact point, so that the virtual crown and the adjacent tooth come into surface contact with each other.

The curving processing unit 60 curves the surface of the virtual crown included in the second area connected to the first area from which a part of the virtual crown is removed. Through this, the shape of the virtual crown partially removed through the crown removing unit 50 has a natural tooth shape.

As described above, the crown digital designing apparatus 100 according to the embodiment of the present invention processes the overlapping area by associating the curving process on the surface of the virtual crown after the removing operation for removing a part of the virtual crown overlapping with the adjacent teeth, At the same time, a more natural tooth shape can be realized.

5 is a flowchart illustrating a process of a crown digital designing method according to an embodiment of the present invention. Hereinafter, the organic operation of each configuration of the crown digital designing apparatus 100 will be described with reference to FIG.

In order to design the crown, it is necessary to acquire the oral image of the patient, reconstruct the acquired image, and create and process spirituality such as image matching.

When a tooth array image for designing a crown is prepared through the above process, the crown generator 20 generates a virtual crown at a position where a crown is required and arranges it in an image (S10). At this time, the placement of the crown may be automatically performed by determining the size and placement position of a specific crown by detecting the position and size of the area where the teeth have been lost through image processing. Alternatively, the crown may be arranged according to user input through the user interface unit 10. [ For example, if the user inputs the maximum convexity of the crown, that is, the position of both end points of the widest part when descending toward the gum, the crown may be arranged to pass through the two points at which the maximum wind & . According to this, the size of the crown and the angle at which it is disposed can be determined based on the distance between two input points and the slope between two points.

In this way, after the virtual crown is created in the tooth array image, if it is determined that the virtual crown and the adjacent teeth adjacent to the virtual crown are overlapped (S20), a process for processing the overlapping portion between the virtual crown and the adjacent tooth is followed .

The tooth position shifting unit 30 moves the position of the adjacent tooth in accordance with the value of the parameter regarding the final positional relationship between the virtual crown and the adjacent tooth after the overlapping partial processing (S30, S40). Here, the direction in which the adjacent tooth is moved relative to the virtual crown is determined according to whether or not the value of the parameter is greater than or less than zero, as described above. For reference, the parameter value may be a value directly set by the user through the user interface unit 10, or may be a value set by the system itself. On the other hand, when the parameter value is 0, the position shifting process is omitted.

In this way, the contact point is determined on the surface of the adjacent tooth overlapped with the virtual crown through user input or image processing through the user interface unit 10 in the state where the adjacent tooth is moved (S50). The contact point is a point on the surface of the adjacent tooth where the virtual crown and the adjacent tooth are superimposed to the maximum, and serves as a reference for distinguishing between the area where the virtual crown is partially removed and the area where the curving is performed.

The crown removal unit 50 removes a portion of the virtual crown which overlaps with the adjacent tooth in the first region included in the predetermined radius based on the contact point (S60), and then the curving processing unit (60) The surface of the virtual crown included in the second area other than the first area is curved to complete a natural tooth shape (S70).

6 to 8 are diagrams for explaining the operation of the crown remover 50 and the curving processing unit 60 in such a manner that the adjacent tooth T1 and the virtual crown T2 are connected to the lingual / Lingual / Buccal. FIGS. 7 and 8 show the virtual crown T2 of FIG. 6 viewed from the mesial / distal direction. Particularly, FIG. 7 shows the correspondence relationship between the image viewed from the lingual / lingual side direction and the image viewed from the mesial / centrifugal plane direction in FIG. For the reference, the lingual side refers to the inside direction of the tongue tooth, the narrow side refers to the outside direction of the tooth to which the ball touches, and the mesial surface direction refers to the near side to the midline, And the direction of the centrifugal plane means farther from the midline and farther from the center of the adjacent plane.

6 and 7, in the first region R1, a part of the virtual crown T2 overlapped when the virtual crown T2 and the adjacent tooth T1 are overlapped is removed as shown in FIG. 4 An operation is performed in which the adjacent tooth T1 and the virtual crown T2 are in surface contact with each other.

At this time, the first region R1 is an area included within the predetermined radius r with respect to the contact point P, and is in contact with the contact point P as shown in Fig. 7 as viewed from the mesial / And is expressed as a circle having a radius r around the point P as a center. On the other hand, the predetermined radius r may be input through the user interface unit 10 or may be a predetermined value.

The second area R2 is an area in which an operation is performed in which the surface of the virtual crown T2 is curved so as to have a natural tooth shape by the curving processing unit 60, Is defined as an area from the intersection line (IL) formed by superimposing the crown (T2) and the adjacent tooth (T1) to a boundary spaced outward by a predetermined distance (d). At this time, the distance d separated from the intersection line IL may also be input through the user interface unit 10, or may be determined by a predetermined value.

6, a virtual crown T2 overlapped with the adjacent tooth T1 by the crown removing unit 50 as a first region R1 from A1 to A2, And the area from A1 to B1 and A2 to B2 is the second area R2 where the surface of the virtual crown T2 is curved by the curving processing unit 60. [ As a result, in the first region R1, the virtual crown T2 is brought into surface contact with the adjacent tooth T1, and in the second region R2, the virtual crown T2 is smoothly brought into contact with the surface of the first region R1 And is curved to be connected. At this time, the curving process is performed so that the virtual crown T2 and the adjacent tooth T1 do not overlap.

On the other hand, the curving process of the virtual crown (T2) surface can be performed using various curve generation algorithms including a Bezier Curve algorithm. For reference, the Bezier curve algorithm is an algorithm that creates a natural curve between two intersecting straight lines.

Fig. 9 is a flowchart showing an example of a method of performing the curving process on the surface of the virtual teeth T2 by the curving processing unit 60, and shows an example of curving using the Bezier curve algorithm.

First, the curving processing unit 60 derives a curve starting point on a virtual crown which is spaced apart from the intersection line IL formed by superimposing the virtual crown T2 and the adjacent teeth T1 by a predetermined distance d in the outward direction (S701). According to this, the curve starting point is located on the surface of the imaginary crown (T2) at the boundary of the second region (R2).

6 and 7, only the two curve start points B1 and B2 shown in the lingual / lingual direction are shown. However, when viewed from the mesial / centrifugal plane direction, as shown in FIG. 8, A plurality of curve starting points B1 to B8 on the boundary can be derived.

In addition, a curve end point for forming a curve together with the curve start point is derived on the boundary of the first region R1 (S702). In FIGS. 6 and 7, only two curve end points A1 and A2 shown in the lingual / lingual direction are shown. However, as shown in FIG. 8 in the mesial / centrifugal plane direction, A plurality of curve end points A1 to A8 can be derived.

On the other hand, the interval between the curve start points and the curve end points and the number thereof can be flexibly determined by the size of the first area R1 and the size of the second area R2, user setting, and the like.

When the curve start points and the curve end points are derived, the tangent lines tangent to the adjacent tooth T1 can be derived while passing through the tangent lines touching the virtual crown (T2) and the curve end points, respectively, while passing through the curve starting points respectively (S703 ). In FIG. 6, the tangent line TLB2 passing through the tangential lines TLB1 and B2 passing through the curve starting point B1 and the tangent lines TLA1 and TLA2 contacting the curve end points A1 and A2, respectively, are shown. Since the virtual crown T2 is partially removed so that the virtual crown T2 and the adjacent tooth T1 are in surface contact with each other in the first region R1, the tangents tangent to the adjacent tooth T1 passing through the curve end points And also to the virtual crown T2.

Subsequently, a plurality of curves C connecting the curve start point and the curve end point are generated based on the derived tangent line (S704). At this time, a curve start point and a curve end point are respectively mapped in a one-to-one relationship, and a plurality of curves C are generated. The parameter value for determining the curvature of the curve when using the Bezier curve algorithm can be variably applied depending on the user setting and the like.

As shown in FIG. 8, when a plurality of curves C are generated, the surface of the virtual crown T2 is meshed to generate a meshed surface S (S705). 8 shows an example in which a plurality of curves C are connected in a concentric shape to generate a meshed surface S. In FIG. For reference, a mesh is a unit for expressing an object in computer graphics, and the mesh processing of a virtual crown can be performed through various known meshing algorithms.

In the above, an example in which the surface of the virtual crown is curved using the Bezier curve algorithm has been explained, but it is needless to say that various curve algorithms can be applied.

Thus, when the virtual crown curving process is completed, the process of processing the overlapping region of the virtual crown and the adjacent tooth is completed by restoring the position of the adjacent tooth to the original position by the tooth position shifting unit 30 (S70 ).

The processed virtual crown may be displayed through the user interface unit 10 and may provide an opportunity for the user to directly modify the surface of the virtual crown.

In the above-described embodiment, the steps are executed when the initial state after the creation of the virtual crown is overlapped with the adjacent teeth. However, the present invention can also be applied to the case where the user changes the position of the virtual crown to overlap the adjacent teeth Of course.

As described above, according to the crown digital designing method and apparatus 100 according to the present invention, since the overlapping portion removal and the curving process are associated with each other, sharp edges are removed and natural results closer to the tooth shape can be obtained . This minimizes the additional work involved in applying the adjustment function in the conventional crown design including the smoothing operation, thereby greatly increasing the convenience of the user and shortening the time required for the design process. In addition, a more natural tooth shape can be realized and the patient's satisfaction with the procedure can be improved.

Meanwhile, the crown digital design method according to the present invention may be embodied as a program that can be executed by a computer, and may be implemented as a variety of recording media such as a magnetic storage medium, an optical reading medium, and a digital storage medium.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or combinations thereof. Implementations may be implemented in a computer program product, such as an information carrier, e.g., a machine readable storage device, such as a computer readable storage medium, for example, for processing by a data processing apparatus, May be embodied as a computer program recorded on a device (computer readable medium). A computer program, such as the computer program (s) described above, may be written in any form of programming language, including compiled or interpreted languages, and may be stored as a stand-alone program or in a module, component, subroutine, As other units suitable for use in the present invention. A computer program may be deployed to be processed on one computer or multiple computers at one site or distributed across multiple sites and interconnected by a communications network.

Processors suitable for processing a computer program include, by way of example, both general purpose and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read-only memory or a random access memory or both. The elements of a computer may include at least one processor for executing instructions and one or more memory devices for storing instructions and data. Generally, a computer may include one or more mass storage devices for storing data, such as magnetic, magneto-optical disks, or optical disks, or may receive data from them, transmit data to them, . ≪ / RTI > Information carriers suitable for embodying computer program instructions and data include, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory A magneto-optical medium such as a floppy disk, an optical disk such as a DVD (Digital Video Disk), a ROM (Read Only Memory), a RAM , Random Access Memory), a flash memory, an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and the like. The processor and memory may be supplemented or included by special purpose logic circuitry.

In addition, the computer-readable medium can be any available media that can be accessed by a computer, and can include computer storage media.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various device components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and devices will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: user interface unit 20: crown generator
30: tooth position shifting unit 40: contact point determining unit
50: Crown removing unit 60: Curving processing unit

Claims (9)

In a crown digital design method in which each step is performed through a computer,
Generating a virtual crown on a tooth array image of a patient;
Determining a point of contact that is a point on a surface of an adjacent tooth overlaid with the virtual crown;
Removing a portion of the virtual crown that overlaps the adjacent tooth in a first region included in a predetermined radius based on the contact point; And
And curving the surface of the virtual crown included in the second area connected to the first area,
Wherein the step of curving the surface of the virtual crown comprises:
Deriving a plurality of curve starting points on the virtual crown that are spaced a predetermined distance from the intersection line formed by the virtual crown and the adjacent tooth; Deriving a plurality of curve end points on the virtual crown at a boundary of the first region; Generating a tangent through each of the plurality of curve starting points and the plurality of curve ending points; Generating a plurality of curves connecting the curve start point and the curve end point based on the derived tangent; And meshing the surface of the virtual crown based on the plurality of curves.
The method according to claim 1,
Wherein removing the portion of the virtual crown comprises:
Wherein a portion of the virtual crown is removed so that the virtual crown and the adjacent tooth are in surface contact with each other in the first region.
The method according to claim 1,
Wherein the second region is a region from a boundary of the first region to a boundary spaced by a predetermined distance from an intersection line formed by the virtual crown and the adjacent tooth.
delete The method according to claim 1,
Moving the position of the adjacent tooth corresponding to a predetermined value of a parameter relating to a final positional relationship between the virtual crown and the adjacent tooth before determining the contact point; And
Further comprising restoring a position of the adjacent tooth after curving the surface of the virtual crown.
The method according to claim 1,
Wherein the step of curving the surface of the virtual crown comprises:
Wherein the crown digital design method is performed based on a Bezier curve algorithm.
A computer-readable recording medium on which a program for executing a crown digital designing method according to any one of claims 1 to 3, 5, and 6 is recorded.
In a crown digital designing device,
A crown generator for generating a virtual crown in a tooth array image of a patient;
A contact point determining unit that determines a contact point that is a point on a surface of a neighboring tooth overlapped with the virtual crown;
A crown remover for removing a portion of the virtual crown which overlaps with the adjacent tooth in a first region included in a predetermined radius based on the contact point; And
And a curving processing unit for performing a curving process on a surface of the virtual crown included in a second region connected to the first region,
Wherein the curving processing unit comprises:
Deriving a plurality of curve starting points on the virtual crown separated by a predetermined distance from the intersection line formed by the virtual crown and the adjacent tooth and deriving a plurality of curve end points on the virtual crown at the boundary of the first area, Generating a plurality of curves connecting the curve start point and the curve end point based on a tangent line passing through the plurality of curve start points and the plurality of curve end points respectively and meshing the surface of the virtual crown based on the plurality of curves Wherein the crown digital design device comprises:
9. The method of claim 8,
The contact point determining unit determines the contact point based on a user input through the user interface unit or detects a point on the surface of the adjacent tooth where the virtual crown and the adjacent tooth are overlapped to the maximum to determine the contact point Wherein the crown digital designing device is a digital crown digital designing device.

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