US 12,419,724 B2
Oral digital impression instrument, digital model for the same, and intelligent method of making and/or using the same
Changjian Wang, Chengdu (CN); Dengkai Zhang, Chengdu (CN); Xinzhang Yan, Chengdu (CN); Guanghui Lu, Chengdu (CN); and Hongbin Cai, Chengdu (CN)
Assigned to CHENGDU BESMILE MEDICAL TECHNOLOGY CORP. LTD., Chengdu (CN)
Filed by ChengDu Besmile Medical Technology Corp. Ltd., Chengdu (CN)
Filed on Oct. 21, 2022, as Appl. No. 18/048,650.
Application 18/048,650 is a continuation of application No. PCT/CN2021/218724, filed on Apr. 21, 2021.
Claims priority of application No. 202010360675.2 (CN), filed on Apr. 30, 2020.
Prior Publication US 2023/0113425 A1, Apr. 13, 2023
Int. Cl. A61C 7/00 (2006.01); A61C 5/70 (2017.01); A61C 5/77 (2017.01); A61C 9/00 (2006.01); A61C 13/00 (2006.01); A61C 13/08 (2006.01); A61C 19/04 (2006.01); G06F 30/00 (2020.01); G06T 7/00 (2017.01); G16H 30/40 (2018.01)
CPC A61C 7/002 (2013.01) [A61C 5/70 (2017.02); A61C 5/77 (2017.02); A61C 9/004 (2013.01); A61C 13/0004 (2013.01); A61C 13/08 (2013.01); A61C 19/04 (2013.01); G06F 30/00 (2020.01); G06T 7/0012 (2013.01); G16H 30/40 (2018.01); A61C 9/0053 (2013.01); G06T 2207/30036 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of modeling and/or designing a dental crown of a to-be-produced tooth using an oral digital impression instrument, comprising:
a) storing data of alternative dental crowns in a database accessible by a computer operatively connected to the oral digital impression instrument, the alternative dental crown data including a tooth number, a dental crown type, an overall size feature vector of the dental crown, and a storage path of at least one tooth;
b) acquiring 3D data of teeth and/or an oral cavity of a patient with oral digital acquisition equipment of the oral digital impression instrument and generating a 3D model of the teeth and/or the oral cavity, the 3D data including an upper jaw and a lower jaw, and confirming occluding relations between the upper jaw and the lower jaw;
c) labeling the 3D model, an abutment tooth position, the dental crown type and an abutment edge line;
d) automatically processing a design of the to-be-produced tooth according to the labeled 3D model, and matching a plurality of the alternative dental crowns from the database;
e) obtain the overall size feature vector of the dental crown by calculation using a six-point method, the six-point method comprising obtaining six outline high points through maximum and minimum tooth crown coordinates, of which two outline high points of mesial and distal surfaces are Pminx and Pmaxx, two additional outline high points of buccal and lingual surfaces are Pminy and Pmaxy, two further outline high points of bottom and top surfaces are Pminz and Pmaxz, the overall size feature vector of the dental crown is (size_x, size_y, size_z), size_x is an absolute value of a difference between x coordinates of the outline high points Pminx and Pmaxx, size_y is an absolute value of a difference between y coordinates of the outline high points Pminy and Pmaxy, and size_z is an absolute value of a difference between z coordinates of the outline high points Pminz and Pmaxz;
f) determining a similarity between the plurality of alternative dental crowns and the to-be-produced tooth according to a cosine of an included angle between an overall size feature vector of at least one of the plurality of alternative dental crowns and the overall size feature vector of the dental crown, the cosine of the included angle being [0,1];
g) adjusting a maxillofacial feature vector and the at least one of the plurality of alternative dental crowns according to a scaling of an overall size feature vector of the to-be-produced tooth; and
h) exporting the design of the to-be-produced tooth according to the labeled 3D model.