US 11,657,733 B2
Training method for evaluating bonding accuracy of orthodontic brackets
Chaoran Xue, Chengdu (CN); Peiqi Wang, Chengdu (CN); Bin Li, Chengdu (CN); Ding Bai, Chengdu (CN); Xianglong Han, Chengdu (CN); Hui Xu, Chengdu (CN); Rui Shu, Chengdu (CN); Yongwen Guo, Chengdu (CN); Ye Tian, Chengdu (CN); Jie Feng, Chengdu (CN); and Yating Wang, Chengdu (CN)
Assigned to Sichuan University, Chengdu (CN)
Filed by Sichuan University, Chengdu (CN)
Filed on Dec. 31, 2021, as Appl. No. 17/566,793.
Claims priority of application No. 202110010740.3 (CN), filed on Jan. 6, 2021.
Prior Publication US 2022/0215778 A1, Jul. 7, 2022
Int. Cl. G09B 23/28 (2006.01); A61B 6/03 (2006.01); A61C 7/16 (2006.01); A61C 9/00 (2006.01); A61C 13/34 (2006.01)
CPC G09B 23/283 (2013.01) [A61B 6/032 (2013.01); A61C 7/16 (2013.01); A61C 9/0046 (2013.01); A61C 13/34 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A bracket bonding accuracy evaluation method, comprising:
using a training device for evaluating the bonding accuracy of orthodontic brackets, wherein the training device comprises a plurality of virtual teeth and an evaluation base to fix the virtual teeth, and a manufacture procedure of the training device comprises taking impressions of selected human teeth, and generating 3D tooth models of the selected human teeth by 3D scanning;
wherein each of the virtual teeth comprises a virtual crown and a root-shaped connector fixed to the virtual crown, wherein the virtual crown has a standard bonding region (SBR) marked on the virtual crown; the root-shaped connector is merged to the virtual crown at ±1 mm from a cemento-enamal junction (CEJ), and the long axis of the root-shaped connector is parallel to the tooth long axis;
the evaluation base comprises connecting grooves to fix the virtual teeth and reference lines for evaluation, wherein the connecting grooves fit the root-shaped connectors of a virtual tooth having a corresponding shape of the plurality of virtual teeth;
each of the virtual teeth is fixed to the evaluation base through the connection between the root-shaped connector and the connecting groove, and when a plurality of virtual teeth are arranged, the plurality of virtual teeth are horizontally arranged, and crown surfaces used for bracket bonding face the same direction;
the reference lines comprise horizontal reference lines, vertical reference lines, and tooth long axis (TA) reference lines, wherein
the TA reference lines are parallel to long axes of corresponding virtual teeth fixed to the evaluation base,
intersections of the horizontal reference lines and the TA reference lines define evaluation points, and
the evaluation points overlap with corresponding SBR centers of the virtual teeth;
the bracket bonding accuracy evaluation method further comprises steps of:
(1) fixing the virtual teeth to the evaluation base;
(2) bonding a bracket on the fixed virtual teeth from step (1);
(3) removing the virtual teeth bonded with the bracket from the matching dental base, and fixing the virtual teeth bonded with the bracket to the corresponding connecting groove on the evaluation base;
(4) determining a center point of the bonded bracket on the fixed virtual teeth, wherein a translation is defined by a distance between the center point of the bonded bracket and the evaluation point, and a rotation is defined by an angle between a vertical bracket slot and a TA reference line;
(5) evaluating the bracket bonding accuracy based on the translation and the rotation;
or
(1) fixing the virtual teeth to a corresponding connecting groove on the evaluation base;
(2) bonding a bracket on the fixed virtual teeth from step (1);
(3) determining a center point of the bonded bracket on the fixed virtual teeth, wherein a translation is defined by the distance between the center point of the bonded bracket and the evaluation point, and a rotation is defined by the angle between the vertical bracket slot and the TA reference line;
(4) evaluating the bracket bonding accuracy based on the translation and the rotation.