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EP-4740902-A1 - APPARATUS AND METHOD FOR GENERATION AND REAL-TIME MODIFICATION OF MARGIN LINE

EP4740902A1EP 4740902 A1EP4740902 A1EP 4740902A1EP-4740902-A1

Abstract

A method performed by an electronic apparatus according to one embodiment of the present disclosure may include identifying an initial point on a three-dimensional oral cavity model, determining a first search direction from the initial point, based on curvature information about the three-dimensional oral cavity model, sequentially determining multiple first search points on the three-dimensional oral cavity model, based on the curvature information and the first search direction, each of the multiple first search points being determined based on the curvature information and one or more first search points determined immediately before, and generating a margin line indicating a closed path on the three-dimensional oral cavity model, based on the multiple first search points.

Inventors

  • LEE, SUNGHOON

Assignees

  • Medit Corp.

Dates

Publication Date
20260513
Application Date
20240705

Claims (20)

  1. A method performed by an electronic apparatus, the method comprising: identifying an initial point on a three-dimensional oral cavity model; determining a first search direction from the initial point, based on curvature information about the three-dimensional oral cavity model; sequentially determining multiple first search points on the three-dimensional oral cavity model, based on the curvature information and the first search direction, each of the multiple first search points being determined based on the curvature information and one or more first search points determined immediately before; and generating a margin line indicating a closed path on the three-dimensional oral cavity model, based on the multiple first search points.
  2. The method of claim 1, wherein the identifying of the initial point comprises receiving an input designating the initial point.
  3. The method of claim 1, wherein the sequentially determining of the multiple first search points comprises: updating the first search direction, based on two or more first search points determined immediately before; and determining a next first search point, based on the curvature information and the updated first search direction.
  4. The method of claim 1, wherein the sequentially determining of the multiple first search points is terminated in response to a determination that a predetermined termination condition is satisfied, and wherein the determination that the predetermined termination condition is satisfied is based on at least one of the number of the multiple first search points, a length of a path including at least some of the multiple first search points, absence of a point in a current search direction from a first search point determined immediately before, and absence of a point adjacent to a first search point determined immediately before in the current search direction and satisfying a predetermined curvature reference.
  5. The method of claim 1, further comprising sequentially determining multiple second search points on the three-dimensional oral cavity model, based on the curvature information and a second search direction from the initial point, the second search direction being opposite to the first search direction, and each of the multiple second search points being determined based on the curvature information and one or more second search points determined immediately before, wherein the generating of the margin line is additionally based on the multiple second search points.
  6. The method of claim 3, wherein the generating of the margin line comprises: determining an initial closed path including the multiple first search points and the multiple second search points; and generating the margin line, based on the initial closed path.
  7. The method of claim 6, wherein the determining of the initial closed path comprises, for each of the multiple first search points and the multiple second search points, connecting a search point having a minimum distance from a corresponding search point to the corresponding search point.
  8. The method of claim 6, wherein the generating of the margin line, based on the initial closed path, comprises generating the margin line by performing smoothing for the closed path and projection on the three-dimensional oral cavity model once or more times.
  9. The method of claim 1, wherein the margin line indicates a boundary between an inner surface and an outer surface of a prosthesis for a specific tooth of a target oral cavity expressed by the three-dimensional oral cavity model.
  10. The method of claim 1, further comprising displaying the three-dimensional oral cavity model and the margin line through a display.
  11. The method of claim 10, further comprising: receiving an input for entering a modification mode for the margin line; initiating the modification mode in which a movement input is continuously received, in response to the input for entering the modification mode; modifying the margin line, based on a target line segment indicated by the movement input up to the present, in response to a determination that a predetermined repetition condition is satisfied while continuing the modification mode; and updating the displaying of the margin line on the display, in response to modification of the margin line.
  12. The method of claim 11, wherein the predetermined repetition condition comprises a lapse of a predetermined time interval.
  13. The method of claim 11, wherein the predetermined repetition condition comprises reaching a predetermined distance interval of a movement distance indicated by the movement input.
  14. The method of claim 11, wherein the modifying of the margin line comprises: selecting one or more points among points included in the margin line, based on the target line segment; and moving each of the one or more selected points in a direction toward the target line segment.
  15. The method of claim 14, wherein the selecting of the one or more points comprises: determining a modification reference point on the margin line, based on a last point of the target line segment; and selecting the one or more points, based on the modification reference point.
  16. The method of claim 15, wherein the selecting of the one or more points, based on the modification reference point, further comprises determining that each of the one or more points is located within a predetermined distance from the modification reference point.
  17. The method of claim 15, further comprising fixing some of points included in the margin line, in response to the input for entering the modification mode, wherein the selecting of the one or more points further comprises: determining two fixed points among the fixed points, based on the modification reference point, the modification reference point being located between the two fixed points on the margin line; and determining that the one or more points are located between the two fixed points on the margin line.
  18. The method of claim 17, further comprising, in response to determining that the modification reference point has passed one of the fixed points on the margin line according to a change in a last point of the target line segment, unfixing the point through which the modification reference point has passed.
  19. An electronic apparatus comprising: at least one processor; and at least one memory in which instructions executed by the at least one processor are stored, wherein the at least one processor is configured to, when the instructions are executed by the at least one processor, execute the method according to one of claims 1 to 18.
  20. A non-transitory computer-readable recording medium recording instructions that, when executed by at least one processor, cause the at least one processor to perform operations, wherein the instructions are configured to cause the at least one processor to execute the method according to one of claims 1 to 18.

Description

TECHNICAL FIELD The technical idea of the present disclosure relates to an apparatus and method for generating and modifying a margin line in real time and, more particularly, to an apparatus and method for generating and modifying a margin line of a tooth in real time on the basis of a three-dimensional (3D) image of an oral cavity received from a 3D scanner. BACKGROUND In general, in order to acquire oral cavity information of a patient, a 3D scanner that is inserted into the patient's oral cavity and acquires an image of the oral cavity may be used. For example, a doctor may insert a 3D scanner into the patient's oral cavity, scan the patient's teeth, gum, and/or soft tissue, thereby acquiring multiple two-dimensional images of the patient's oral cavity, and by applying a 3D modeling technique, a 3D image of the patient's oral cavity may be constructed using the two-dimensional (2D) images of the patient's oral cavity. Meanwhile, artificial structures such as dental prostheses may be used as a method for treating a patient's teeth. One of the important preprocessing operations in the process of creating a prosthesis is configuring a margin line. The margin line is used to define the boundary between a part exposed to the outside (outer surface) and the remaining part (inner surface) when the prosthesis is inserted into the patient's oral cavity, and may have a decisive effect on whether the prosthesis is well contacted and supported by the patient's oral structure. In particular, prostheses such as inlays and veneers may have many curves, and therefore, frequent operations to precisely modify the margin line may require a lot of time. Technologies for automatically generating margin lines and modifying margin lines have not been sufficiently provided. DISCLOSURE TECHNICAL PROBLEM The technical idea of the present disclosure is to provide an apparatus and method for generating a margin line of a tooth and modifying the margin line in real time. TECHNICAL SOLUTION According to an aspect of the technical idea of the present disclosure, a method performed by an electronic apparatus may include an operation of identifying an initial point on a 3D oral cavity model, an operation of determining a first search direction from the initial point, based on curvature information about the 3D oral cavity model, an operation of sequentially determining multiple first search points on the 3D oral cavity model, based on the curvature information and the first search direction, each of the multiple first search points being determined based on the curvature information and at least one most recently determined first search point, and an operation of generating a margin line indicating a closed path on the 3D oral cavity model, based on the multiple first search points. An electronic apparatus according to an aspect of the technical idea of the present disclosure may include one or more processors, and one or more memories storing instructions executed by the one or more processors, wherein the one or more processors may be configured to, when the instructions are executed by the one or more processors, execute one of the methods according to an aspect of the technical idea of the present disclosure. A non-transitory computer-readable recording medium according to an aspect of the technical idea of the present disclosure may record instructions that, when executed by one or more processors, cause the one or more processors to perform operations, wherein the instructions may be configured to cause the one or more processors to perform one of the methods according to an aspect of the technical idea of the present disclosure. ADVANTAGEOUS EFFECTS According to an exemplary embodiment of the present disclosure, an apparatus and method may automatically and quickly generate a margin line of a tooth on the basis of a 3D image of the oral cavity. According to an exemplary embodiment of the present disclosure, an apparatus and method may allow a user to modify margin lines in real time by performing a minimum of operation while viewing incorrectly generated areas during margin line generation. According to an exemplary embodiment of the present disclosure, an apparatus and method may quickly and efficiently perform a margin line operation for generating a prosthesis through automatic generation and real-time modification of margin lines. The effects acquirable from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned may be clearly derived and understood by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from practicing the exemplary embodiments of the present disclosure may also be derived by a person having ordinary skill in the art from the exemplary embodiments of the present disclosure. DESCRIPTION OF DRAWINGS FIG. 1 is