US 11,684,463 B2
Method and system of repairing oral defect model
Yen-Wen Shen, Taichung (TW); Lih-Jyh Fuh, Taichung (TW); and Chi-Hsiung Yu, Toufen (TW)
Assigned to China Medical University, Taichung (TW)
Filed by China Medical University, Taichung (TW)
Filed on Jan. 12, 2021, as Appl. No. 17/146,685.
Claims priority of application No. 109101588 (TW), filed on Jan. 16, 2020.
Prior Publication US 2021/0220094 A1, Jul. 22, 2021
Int. Cl. A61C 13/00 (2006.01); G06T 19/00 (2011.01); A61C 9/00 (2006.01); G16H 50/50 (2018.01); A61C 13/34 (2006.01); A61C 5/77 (2017.01)
CPC A61C 13/0004 (2013.01) [A61C 9/0046 (2013.01); A61C 13/34 (2013.01); G06T 19/00 (2013.01); G16H 50/50 (2018.01); A61C 5/77 (2017.02); G06T 2210/41 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A system of repairing an oral defect model, comprising:
a scanner configured to scan one of an oral cavity and an oral cavity model to obtain a three-dimensional oral defect model message;
a processor signally connected to the scanner, wherein the processor receives the three-dimensional oral defect model message and comprises:
a defect cutting line detecting module, wherein the defect cutting line detecting module detects a defect cutting line of the three-dimensional oral defect model message, and the defect cutting line comprises at least one defect feature point;
a defect point selecting module signally connected to the defect cutting line detecting module, wherein the defect point selecting module selects the at least one defect feature point of the defect cutting line; and
a smoothing module signally connected to the defect point selecting module, wherein the smoothing module performs a smoothing process at the at least one defect feature point, and converts the three-dimensional oral defect model message into a three-dimensional oral repaired model message to smooth the defect cutting line; and
a displayer signally connected to the processor, wherein the displayer displays the three-dimensional oral defect model message, the defect cutting line and the three-dimensional oral repaired model message;
wherein the defect cutting line detecting module comprises:
performing a sight selecting step to select an abutment region of the three-dimensional oral defect model message, and observe the abutment region from a top view of the abutment region;
performing a projecting step to project the three-dimensional oral defect model message in the abutment region to a two-dimensional plane according to the top view of the abutment region so as to form a two-dimensional projecting point set;
performing an interpolating step to perform an orthogonal grid interpolation method at the two-dimensional projecting point set to obtain a two-dimensional concentrated projecting point set; and
performing a controlling point detecting step to search a feature region with an annular shape in an equal angle and a radially way out from a departure point, and then search a plurality of triangular grids of the feature region, wherein the triangular grids are viewed as a plurality of controlling points;
wherein the orthogonal grid interpolation method is an inverse distance weighted (IDW) method, and a dot density of the two-dimensional concentrated projecting point set is greater than a dot density of the two-dimensional projecting point set, and the departure point is determined as a model center of the two-dimensional concentrated projecting point set.