# US 12,183,005 B2 · System and method for performing quality control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,005 B2 - Document ID: US12183005B2 - Status: Granted - Kind: B2 - Application number: 17/644,371 - Filed: 2021-12-15 - Published: 2022-04-07 - Granted: 2024-12-31 - Earliest claimed: 2018-03-22 - Assignees: James R. Glidewell Dental Ceramics, Inc. - Applicants: James R. Glidewell Dental Ceramics, Inc. - Inventors: Abhishek Babasaheb Ajri; Vaheh Golestanian Nemagrdi; Marco Antonio Jokada; David Christopher Leeson - Web page: https://patentgrep.com/patent/US12183005B2 ## CPC - A61C 13/0004: {Computer-assisted sizing or machining of dental prostheses} - G06T 7/0014: {using an image reference approach} - A61C 9/0093: {Workpiece support} - G06F 17/18: for evaluating statistical data {, e.g. average values, frequency distributions, probability functions, regression analysis (forecasting specially adapted for a specific administrative, business or logistic context G06Q10/04)} - G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) - G06F 30/23: using finite element methods [FEM] or finite difference methods [FDM] - G06F 2113/10: Additive manufacturing, e.g. three-dimensional [3D] printing - G06F 2119/18: Manufacturability analysis or optimisation for manufacturability - G06T 2207/30036: Dental; Teeth - G06T 2207/30052: Implant; Prosthesis - 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) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Disclosed are example embodiments of methods and systems for identifying and quantifying manufacturing defects of a manufactured dental prosthesis. Certain embodiments of the system for performing quality control on manufactured dental prostheses includes: a quality control module configured to determine whether the dental prosthesis is a good or a defective product based at least on a differences model generated by comparing a design model and a scanned model of the manufactured dental prosthesis. ## Claims ### Claim 1 A method for performing quality control on a dental prosthesis manufacturing system, the method comprising: providing a computer-aided design (CAD) model of a dental prosthesis; manufacturing a physical dental prosthesis based on the CAD model; scanning the physical dental prosthesis to create a 3D scan model; generating a differences model by comparing the CAD model with the 3D scan model and compiling offsets between portions of a data set of the CAD model and corresponding portions of a data set of the 3D scan model; modifying the differences model by omitting from the differences model portions of the data set corresponding to an occlusal surface of the dental prosthesis; and analyzing the differences model to determine whether the dental prosthesis manufacturing system is operating within a predetermined tolerance threshold. ### Claim 2 (depends on 1) The method of claim 1, further comprising modifying the differences model by omitting from the differences model portions of the data set corresponding to a bottom portion near a margin line of the dental prosthesis. ### Claim 3 (depends on 1) The method of claim 1, wherein the CAD model comprises a computer generated design model of the dental prosthesis based upon patient-specific data. ### Claim 4 (depends on 1) The method of claim 1, wherein the CAD model comprises a computer generated design model based upon a simulation of a manufacturing process for the dental prosthesis. ### Claim 5 (depends on 4) The method of claim 4, wherein the simulated manufacturing process comprises a simulated CNC milling or 3D printing process. ### Claim 6 (depends on 1) The method of claim 1, wherein analyzing the differences model comprises performing a statistical analysis on the differences model. ### Claim 7 (depends on 1) The method of claim 1, wherein analyzing the differences model comprises determining a standard deviation of offset values of points of the differences model. ### Claim 8 (depends on 1) The method of claim 1, further comprising determining that the manufactured dental prosthesis is too small or too large based on a distribution of offsets that is negatively or positively biased as compared to a normal distribution. ### Claim 9 (depends on 1) The method of claim 1, further comprising determining that the manufactured dental prosthesis has a manufacturing defect when a distribution of offsets includes peaks at a left and right side of a normal distribution curve. ### Claim 10 (depends on 1) The method of claim 1, further comprising shutting down one or more prosthetic manufacturing machineries based on a result of analyzing the differences model to determine whether the dental prosthesis manufacturing system is operating within the predetermined tolerance threshold. ### Claim 11 (depends on 1) The method of claim 1, further comprising accepting the manufactured dental prosthesis as a good product based on a result of analyzing the differences model to determine whether the dental prosthesis manufacturing system is operating within the predetermined tolerance threshold. ### Claim 12 (depends on 1) The method of claim 1, further comprising rejecting the manufactured dental prosthesis as a defective product based on a result of analyzing the differences model to determine whether the dental prosthesis manufacturing system is operating within the predetermined tolerance threshold. ### Claim 13 (depends on 1) The method of claim 1, further comprising: determining whether the manufactured dental prosthesis is too small or too large based on whether a distribution of offsets is negatively or positively biased as compared to a normal distribution; determining whether the manufactured dental prosthesis has a manufacturing defect based on whether the distribution of offsets includes peaks at a left or right side of a normal distribution curve; and shutting down one or more prosthetic manufacturing machineries based at least on whether the manufactured dental prosthesis is too small, too large, or has a manufacturing defect.