US 12,251,278 B2
Dental shade matching for multiple anatomical regions
Yannick Glinec, Serris (FR); and Victor C. Wong, Rochester, NY (US)
Assigned to DENTAL IMAGING TECHNOLOGIES CORPORATION, Quakertown, PA (US)
Appl. No. 17/431,747
Filed by Dental Imaging Technologies Corporation, Quakertown, PA (US)
PCT Filed Mar. 10, 2020, PCT No. PCT/US2020/021804
§ 371(c)(1), (2) Date Aug. 18, 2021,
PCT Pub. No. WO2020/185733, PCT Pub. Date Sep. 17, 2020.
Claims priority of provisional application 62/816,199, filed on Mar. 10, 2019.
Prior Publication US 2022/0110729 A1, Apr. 14, 2022
Int. Cl. A61C 13/08 (2006.01); A61C 9/00 (2006.01); G01J 3/50 (2006.01); G06T 7/90 (2017.01)
CPC A61C 13/082 (2013.01) [A61C 9/0053 (2013.01); G01J 3/508 (2013.01); G06T 7/90 (2017.01); G06T 2207/10024 (2013.01); G06T 2207/10028 (2013.01); G06T 2207/30036 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A shade matching method for a tooth comprising:
(aa) obtaining a plurality of digitized tooth shade references, wherein each tooth shade reference corresponds to a common 3D tooth shape having a reference coordinate system, a label and color information on the common 3D tooth shape;
(a) obtaining a 3D surface representation of a tooth and associated color information defined on the 3D surface representation;
(b) selecting a region on the 3D surface representation of the tooth defined by coordinates of a tooth coordinate system;
(c) determining a plurality of correspondences with regions of the common 3D tooth shape of all the plurality of digitized tooth shade references by mapping the coordinates for the region on the 3D surface representation to coordinates of the reference coordinate system, wherein the plurality of correspondences connects points from a same anatomical region between the selected region on the 3D surface representation of the tooth and the common 3D tooth shape;
(d) computing a color difference for each tooth shade reference of the plurality of digitized tooth shade references, wherein each color difference is computed by a comparison of color information from a tooth shade reference with the associated color information from the selected region on the 3D surface representation of the tooth, wherein the comparison of color information uses the plurality of correspondences; and
(e) recording the label corresponding to the tooth shade reference with a smallest difference.