Method for recording individual three-dimensional optical images to form a global image of a tooth situation

Patent metadata

Field	Value
Publication number	US-9978172-B2
Application number	US-201314421219-A
Country	US
Kind code	B2
Filing date	Aug 14, 2013
Priority date	Aug 14, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The invention relates to a method for recording individual three-dimensional optical images ( 1 ) to form a global image ( 50 ) of a tooth situation comprising an upper jaw ( 2 ) and a lower jaw ( 3 ). A first 3D model ( 6 ) of a first subsection of the upper jaw and a second 3D model ( 8 ) of a second subsection of the lower jaw are produced from the individual images. Subsequently, a geometric positional relationship between the first 3D model ( 6 ) and the second 3D model ( 8 ) is determined, said positional relationship being determined by using a lateral image ( 20, 21, 22 ) and/or using a contact pattern ( 31, 32 ). Said lateral image ( 20, 21, 22 ) comprises an image area which comprises at least part of the first subsection of the upper jaw ( 2 ) and at least part of the second subsection of the lower jaw ( 3 ). Said contact pattern comprises several contact areas ( 31, 32 ) between the upper jaw and the lower jaw. Said contact pattern ( 30, 31, 32 ) is measured by means of an occlusion paper ( 29 ).

First claim

The invention claimed is:

1. A method, comprising the steps of:
generating a first 3D model of a first subsection of an upper jaw from a portion of a plurality of three-dimensional optical images;
generating a second 3D model of a second subsection of a lower jaw from another portion of the plurality of three-dimensional optical images;
determining a geometric relationship between the first 3D model and the second 3D model based on
i. a lateral three-dimensional optical image or
ii. a lateral three-dimensional optical image and a contact pattern,

wherein the lateral three-dimensional optical image has an image area which at least partially comprises the first subsection of the upper jaw and at least partially comprises the second subsection of the lower jaw, and
wherein the contact pattern comprises a plurality of contact areas between the upper jaw and lower jaw, and
deforming the first 3D model and/or the second 3D model based on the determined geometric positional relationship, said deforming step including the step of dividing each 3D model into different sections which are connected to each other by simulated spring forces, said simulated spring forces causing the deformation to be evenly distributed to the different sections of each 3D model.

2. The method according to claim 1 , wherein, in the determining, a plurality of lateral three-dimensional optical images are used to determine the geometric positional relationship.

3. The method according to claim 1 , wherein the determining is based on the lateral three-dimensional optical image, and
wherein, in the determining, the lateral three-dimensional optical image is searched for (i) a first surface structure of the first 3D model and (ii) a second surface structure of the second 3D model, and
wherein the geometric positional relationship between the first 3D model and the second 3D model is determined based on an arrangement of the first surface structure relative to the second surface structure.

4. The method according to claim 1 , wherein the determining is based on the contact pattern, and
wherein the plurality of contact areas respectively correspond to a plurality of local correspondences between the first 3D model and the second 3D model.

5. The method according to claim 1 ,
wherein the first 3D model and/or the second 3D model are adjusted such that first virtual contact areas on the first 3D model correspond with second virtual contact areas on the second 3D model.

6. The method according to claim 1 , wherein the first 3D model and/or the second 3D model are adjusted such that a first virtual surface structure of the first 3D model is arranged relative to a second virtual surface structure of the second 3D model.

7. The method according to claim 1 , wherein one of the first 3D model and the second 3D model has a greater measuring precision than another of the first 3D model and the second 3D model, and
wherein the other of the first 3D model and the second 3D model is adjusted relative to the one of the first 3D model and the second 3D model with the greater measuring precision.

8. The method according to claim 1 , wherein the first 3D model and/or the second 3D model are adjusted such that a deviation between first virtual contact areas on the first 3D model and second virtual contact areas on the second 3D model is minimized.

9. The method according to claim 1 , wherein the first 3D model and/or the second 3D model are adjusted such that a deviation between a first virtual surface structure of the first 3D model and a second virtual surface structure of the second 3D model is minimized.

10. The method according to claim 1 , wherein each of the plurality of three-dimensional optical images overlaps with at least two other images of the plurality of three-dimensional optical images and is registered with the at least two other images of the plurality of three-dimensional optical images and wherein the at least two other images of the plurality of three-dimensional optical images comprise a previous image and another already made image.

11. The method according to claim 1 , further comprising taking the lateral three-dimensional optical image from a labial or a buccal direction or from an oblique direction that is at a maximum angle of 30° to the labial direction.

12. An apparatus, comprising:
a computer, configured to:
generate a first 3D model of a first subsection of an upper jaw from a portion of a plurality of three-dimensional optical images,
generate a second 3D model of a second subsection of a lower jaw from another portion of the plurality of three-dimensional optical images, and
determine a geometric positional relationship between the first 3D model and the second 3D model based on
i. a lateral three-dimensional optical image or
ii. a lateral three-dimensional optical image and a contact pattern,

wherein the lateral three-dimensional optical image has an image area which at least partially comprises the first subsection of the upper jaw and at least partially comprises the second subsection of the lower jaw, and
wherein the contact pattern comprises a plurality of contact areas between the upper jaw and lower jaw, and
wherein the computer is further configured to deform the first 3D model and/or the second 3D model based on the determined geometric positional relationship by dividing each 3D model into different sections which are connected to each other by simulated spring forces, said simulated spring forces causing the deformation to be evenly distributed to the different sections.

13. The apparatus according to claim 12 , wherein the computer is further configured to determine the geometric positional relationship based on a plurality of lateral three-dimensional optical images.

14. The apparatus according to claim 12 , wherein the computer is further configured to search the lateral three-dimensional optical image for (i) a first surface structure of the first 3D model and (ii) a second surface structure of the second 3D model, and
wherein the computer is further configured to determine the geometric positional relationship between the first 3D model and the second 3D model based on an arrangement of the first surface structure relative to the second surface structure.

15. The apparatus according to claim 12 , wherein the plurality of contact areas respectively correspond to a plurality of local correspondences between the first 3D model and the second 3D model.

16. The apparatus according to claim 12 , wherein the computer is further configured to adjust the first 3D model and/or the second 3D model such that first virtual contact areas on the first 3D model correspond with second virtual contact areas on the second 3D model.

17. The apparatus according to claim 12 , wherein the computer is further configured to adjust the first 3D model and/or the second 3D model such that a first virtual surface structure of the first 3D model is arranged relative to a second virtual surface structure of the second 3D model.

18. The apparatus according to claim 12 , wherein one of the first 3D model and the second 3D model has a greater measuring precision than another of the first 3D model and the second 3D model, and
wherein the other of the first 3D model and the second 3D model is adjusted relative to the one of the first 3D model and the second 3D model with the greater measuring precision.

19. The apparatus according to claim 12 , wherein the computer is further configured to adjust the first 3D model and/or the second 3D model such th

Assignees

• Dentsply Sirona Inc

Inventors

• Adamson Anders
• Lehner Burkhard
• Sattler Joost
• Bobach Tom
• Thiel Frank

Classifications

• G06T2219/2008

  Assembling, disassembling · CPC title

• A61C9/0053 Primary

  Optical means or methods, e.g. scanning the teeth by a laser or light beam · CPC title

• G06T2210/32

  Image data format · CPC title

• G06T2219/016

  Exploded view · CPC title

• G06T15/20

  Perspective computation · CPC title