# US 2023/0068041 A1 · Method and apparatus for generating orthodontic teeth arrangement shape > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0068041 A1 - Document ID: US20230068041A1 - Status: Published application - Kind: A1 - Application number: 17/793,457 - Filed: 2020-11-09 - Published: 2023-03-02 - Earliest claimed: 2020-01-16 - Assignees: Ddh Inc. - Applicants: Ddh Inc. - Inventors: Soo Bok HER; Joo Han LEE; Sung Joo CHO; Joon Mo MOON - Web page: https://patentgrep.com/patent/US20230068041A1 ## CPC - A61C 7/002: {Orthodontic computer assisted systems} - A61B 5/4547: {Evaluating teeth} - A61C 9/00: Impression cups, {i.e. impression trays}; Impression methods {(computer-assisted sizing A61C13/0004; instruments for determining occlusion A61C19/05)} - A61C 9/0046: {Data acquisition means or methods} - G06F 30/10: Geometric CAD - G06T 7/12: Edge-based segmentation - G06T 7/181: involving edge growing; involving edge linking - G16H 20/30: relating to physical therapies or activities, e.g. physiotherapy, acupressure or exercising - G16H 30/40: for processing medical images, e.g. editing - G16H 50/50: for simulation or modelling of medical disorders - A61C 2007/004: {Automatic construction of a set of axes for a tooth or a plurality of teeth} - G06F 2111/16: Customisation or personalisation - G06T 2207/10081: Computed x-ray tomography [CT] - G06T 2207/20164: Salient point detection; Corner detection - G06T 2207/30036: Dental; Teeth - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA ## Abstract Provided is a method for generating an orthodontic teeth alignment shape for the orthodontic treatment of a patient. According to the present invention, there is provided a method for generating an orthodontic teeth alignment shape, the method including the steps of: acquiring a patient's teeth shape information; extracting specific points of respective teeth within a given range of at least one of the patient's upper and lower jaws, based on the acquired teeth shape information; comparing the patient's arch form produced by connecting the specific points to one another with a plurality of standard arch forms stored in a database; selecting the standard arch form that is most similar to the patient's arch form from the plurality of standard arch forms stored in the database, based on the comparison result; and generating the orthodontic teeth alignment shape based on the selected standard teeth alignment form. ## Claims ### Claim 1 A method for generating an orthodontic teeth alignment shape for the orthodontic treatment of a patient, the method comprising the steps of: acquiring a patient's teeth shape information; extracting specific points of respective teeth within a given range of at least one of the patient's upper and lower jaws, based on the acquired teeth shape information; comparing the patient's arch form produced by connecting the specific points to one another with a plurality of standard arch forms stored in a database; selecting the standard arch form that is most similar to the patient's arch form from the plurality of standard arch forms stored in the database, based on the comparison result; and generating the orthodontic teeth alignment shape based on the selected standard teeth alignment form. ### Claim 2 (depends on 1) The method according to claim 1, wherein the specific points are Facial Axis points (FA points) of the respective teeth. ### Claim 3 (depends on 2) The method according to claim 2, further comprising the step of projecting the extracted specific points of the respective teeth on a reference plane, the patient's arch form produced by connecting the specific points projected on the reference plane to one another being compared with the plurality of standard arch forms. ### Claim 4 (depends on 3) The method according to claim 3, wherein the step of projecting the extracted specific points of the respective teeth on a reference plane comprises the steps of: determining the facial axial points of the respective teeth within the given range; calculating the three-dimensional coordinates of the determined facial axis points with respect to arbitrary reference points; producing the reference plane using the calculated coordinates; and projecting the respective facial axis points on the produced reference plane and calculating the two-dimensional coordinates of the respective facial axis points projected on the reference plane. ### Claim 5 (depends on 4) The method according to claim 4, wherein the step of producing the reference plane is performed to produce the reference plane where the sum of the vertical distances from the respective facial axis points is minimal. ### Claim 6 (depends on 5) The method according to claim 5, wherein the step of producing the reference plane is performed to produce the reference plane where the E value calculated by the following expression with the vertical distances e1 to en from the facial axis points is minimal, E=√{square root over (e12+e22+e32+ . . . +en2)} ### Claim 7 (depends on 2) The method according to claim 2, wherein the plurality of standard arch forms are sorted by performing statistical cluster analysis for the arch forms studied for a plurality of normal occlusion samples and expressed as cubic functions on two-dimensional plane with x- and y-axes. ### Claim 8 (depends on 7) The method according to claim 7, wherein the plurality of standard arch forms are represented by the following cubic functions and have different coefficients β1 and β2 from one another, y=β1×x3+β2×x2(x>0) y=−β1×x3+β2×x2(x<0) ### Claim 9 (depends on 8) The method according to claim 8, wherein the step of comparing the patient's arch form produced by connecting the specific points to one another with a plurality of standard arch forms stored in a database is performed by determining a curve expressed as the cubic function that is most similar to the patient's arch form made by connecting the facial axis points of the respective teeth and comparing the determined curve with the plurality of standard arch forms. ### Claim 10 (depends on 9) The method according to claim 9, wherein the step of comparing the patient's arch form produced by connecting the specific points to one another with a plurality of standard arch forms stored in a database is performed by determining the curve that is most similar to the patient's arch form based on a minimal value of an area or distance of a space made by overlaying the plurality of standard arch forms and the patient's arch form on top of each other. ### Claim 11 (depends on 10) The method according to claim 10, wherein the step of selecting the standard arch form that is most similar to the patient's arch form from the plurality of standard arch forms is performed by selecting the standard arch form that has the most similar curvature to the determined curve, based on a difference between the coefficients β1 and β2 of the standard arch forms and the coefficients β1 and β2 of the curve. ### Claim 12 (depends on 1) The method according to claim 1, wherein the step of acquiring a patient's teeth shape information comprises the step of distinguishing the patient's teeth from the gum. ### Claim 13 (depends on 8) The method according to claim 8, wherein the plurality of standard arch forms comprise three standard arch forms having different values of coefficients β1 and β2 from one another on each of the upper and low jaws. ### Claim 14 A device for generating an orthodontic teeth alignment shape for the orthodontic treatment of a patient, comprising: a processor; and a memory for storing instructions executable by the processor, wherein the processor executes the instructions to acquire a patient's teeth shape information, extract specific points of respective teeth within a given range of at least one of the patient's upper and lower jaws, based on the acquired teeth shape information, compare the patient's arch form produced by connecting the specific points to one another with a plurality of standard arch forms stored in a database, select the standard arch form that is most similar to the patient's arch form from the plurality of standard arch forms stored in the database, based on the comparison result, and generate the orthodontic teeth alignment shape based on the selected standard teeth alignment form. ### Claim 15 (depends on 14) The device according to claim 14, wherein the specific points are Facial Axis points (FA points) of the respective teeth. ### Claim 16 (depends on 15) The device according to claim 15, wherein the processor projects the extracted specific points of the respective teeth on a reference plane and compares the patient's arch form produced by connecting the specific points projected on the reference plane to one another with the plurality of standard arch forms. ### Claim 17 (depends on 16) The device according to claim 16, wherein the processor determines the facial axial points of the respective teeth within the given range, calculates the three-dimensional coordinates of the determined facial axis points with respect to arbitrary reference points, produces the reference plane using the calculated coordinates, projects the respective facial axis points on the produced reference plane, and calculates the two-dimensional coordinates of the respective facial axis points projected on the reference plane. ### Claim 18 (depends on 17) The device according to claim 17, wherein the processor produces the reference plane where the sum of the vertical distances from the respective facial axis points is minimal. ### Claim 19 (depends on 18) The device according to claim 18, wherein the processor produces the reference plane where the E value calculated by the following expression with the vertical distances e1 to en from the facial axis points is minimal, E=√{square root over (e12+e22+e32+ . . . +en2)} ### Claim 20 (depends on 15) The device according to claim 15, wherein the plurality of standard arch forms are sorted by performing statistical cluster analysis for the arch forms studied for a plurality of normal occlusion samples and expressed as cubic functions on two-dimensional plane with x- and y-axes. ### Claim 21 (depends on 20) The device according to claim 20, wherein the plurality of standard arch forms are represented by the following cubic functions and have different coefficients β1 and β2 from one another, y=β1×x3+β2×x2(x>0) y=−β1×x3+β2×x2(x<0) ### Claim 22 (depends on 21) The device according to claim 21, wherein the processor determines a curve expressed as the cubic function that is most similar to the patient's arch form made by connecting the facial axis points of the respective teeth and compares the determined curve with the plurality of standard arch forms. ### Claim 23 (depends on 22) The device according to claim 22, wherein the processor determines the curve that is most similar to the patient's arch form, based on a minimal value of an area or distance of a space made by overlaying the plurality of standard arch forms and the patient's arch form on top of each other. ### Claim 24 (depends on 23) The device according to claim 23, wherein the processor selects the standard arch form that has the most similar curvature to the determined curve, based on a difference between the coefficients β1 and β2 of the standard arch forms and the coefficients β1 and β2 of the curve. ### Claim 25 (depends on 14) The device according to claim 14, wherein the processor distinguishes the patient's teeth from the gum. ### Claim 26 (depends on 21) The device according to claim 21, wherein the plurality of standard arch forms comprise three standard arch forms having different values of coefficients β1 and β2 from one another on each of the upper and low jaws.