US 11,883,258 B2
Method for generating a 3D model of a dental arch
Philippe Salah, Paris (FR); Guillaume Ghyselinck, Cantin (FR); Thomas Pellissard, Clichy (FR); and Laurent Debraux, Paris (FR)
Assigned to DENTAL MONITORING, Paris (FR)
Appl. No. 17/046,815
Filed by DENTAL MONITORING, Paris (FR)
PCT Filed Apr. 5, 2019, PCT No. PCT/EP2019/058708
§ 371(c)(1), (2) Date Oct. 12, 2020,
PCT Pub. No. WO2019/197297, PCT Pub. Date Oct. 17, 2019.
Claims priority of application No. 183054558 (EP), filed on Apr. 13, 2018.
Prior Publication US 2021/0145550 A1, May 20, 2021
Int. Cl. A61C 9/00 (2006.01); A61B 1/24 (2006.01); A61B 1/00 (2006.01); A61B 1/06 (2006.01); A61B 5/00 (2006.01)
CPC A61C 9/0053 (2013.01) [A61B 1/000096 (2022.02); A61B 1/00194 (2022.02); A61B 1/0605 (2022.02); A61B 1/24 (2013.01); A61B 5/0088 (2013.01); A61C 9/006 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for generating a three-dimensional digital model of a dental arch of a patient, by means of an acquisition device comprising:
a support;
a dental retractor fixed to the support and defining a retractor aperture;
an updated image acquisition unit fixed to the support in a position in which it observes the retractor aperture along an optical axis;
a projector suitable for projecting a light beam toward the retractor aperture, so as to draw, when the retractor is worn by the patient, at least one light mark on the arch of the patient, and
a processing module,
said method comprising the following steps:
A) projection, by means of the projector, of at least one light beam onto the arch, so as to draw at least one light mark on the arch;
B) simultaneously with the step A), displacement of the arch across the light beam and acquisition, during said displacement, of a series of said updated images of said arch each showing a representation of the projected light mark, or “updated projection”;
C) identification, by the processing module, of said updated projection on each updated image, then production, by the processing module, of a three-dimensional digital model, called “updated model”, exhibiting a best fit with all the updated projections, the updated model being sought by means of an optimization method and/or a deep learning device.