Patent ID: 11864970
Assignee: ALIGN TECHNOLOGY, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A method of orthodontic treatment, comprising:
receiving a 3D digital representation of an initial arrangement and a final arrangement of a plurality of teeth;
generating a 3D treatment plan comprising a plurality of 3D models of teeth for rearranging the plurality of teeth from the initial arrangement toward the final arrangement in a plurality of stages of treatment;
determining, in accordance with the 3D treatment plan, an intended movement of at least one tooth for each of the plurality of stages;
deriving, using a 3D resistance model, an applied force system for achieving the intended movement of the at least one tooth for each of the plurality of stages, wherein the 3D resistance model comprises three lines of resistance of the at least one tooth at each of the plurality of stages, wherein the three lines of resistance are determined based on forces at each of the plurality of stages, wherein the three lines of resistance change in response to forces from different directions at each of the plurality of stages, and deriving the 3D resistance model includes
determining whether the at least one tooth comprises a 3D center of resistance based on an intersection or lack thereof of the three lines of resistance; and
generating a plurality of oral appliances for the plurality of stages of treatment based on the derived applied force system.