Method, system, and computer-readable medium for uncovering and planning an accurate dental preparation

• US 8,897,526 B2
• Filed: 05/06/2011
• Issued: 11/25/2014
• Est. Priority Date: 05/06/2011
• Status: Active Grant

• Current Assignee: Sirona Dental Systems GmbH (Sirona Dental Systems Incorporated)
• Original Assignee: Sirona Dental Systems GmbH (Sirona Dental Systems Incorporated)
• Inventors: MacLeod, Roddy, Michaeli, Daniel, Wedler, Volker
• Primary Examiner(s): Lu, Tom Y
• Application Number:
  US13/102,377
• Publication Number:
  US 20120282572A1
• Time in Patent Office: 1,299 Days
• Field of Search: 382/128, 382/131
• US Class Current: 382/131
• CPC Class Codes: A61C 13/0004 Computer-assisted sizing or machining of dental prostheses
• CPC Class Codes: A61C 9/004 Means or methods for taking digitized impressions

Abstract

A procedure for creating a dental prosthetic includes registering three-dimensional (3D) dental impression image data of a tooth restoration site and 3D x-ray image data of the tooth restoration site, and removing image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data. A system for producing a dental prosthetic includes at least one processor operable to register 3D dental impression image data of a tooth restoration site and 3D x-ray image data of the tooth restoration site and remove image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data.

Claims

1. A procedure for creating a dental prosthetic, the procedure comprising:

registering three-dimensional (3D) dental impression image data of a tooth restoration site and 3D x-ray image data of the tooth restoration site;

automatically removing image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data based on a distinction in the 3D x-ray image data between soft tissue and hard tissue; and

demarcating, in the 3D dental impression image data, a preparation margin of a prepared tooth from which soft tissue was removed, in the tooth restoration site.

2. A procedure according to claim 1, further comprising:

generating the 3D dental impression image data; and

generating the 3D x-ray image data.

3. A procedure according to claim 2, further comprising generating a model of a dental prosthetic based on the 3D dental impression image data in which the image data corresponding to soft tissue in the tooth restoration site has been removed.

4. A procedure according to claim 3, further comprising fabricating the dental prosthetic based on the model.

5. A procedure according to claim 4,

wherein the generating of the 3D dental impression image data includes taking one or more scans of an optical camera,

wherein the generating of the 3D x-ray image data includes taking one or more computer tomography scans by an x-ray system,

wherein at least one of the registering, the removing, and the generating of the model is performed by a computer-aided design (CAD) system, and

wherein the fabricating of the dental prosthetic is performed using a computer-assisted manufacturing (CAM) milling system.

6. A procedure according to claim 3,

wherein the model is a computer model.

7. A procedure according to claim 1,

wherein the image data corresponding to soft tissue is image data on gingival tissue near a tooth within the tooth restoration site.

8. A system for producing a dental prosthetic, the system comprising:

a memory storing a program; and

at least one processor operating under control of the program to register three-dimensional (3D) dental impression image data of a tooth restoration site and 3D x-ray image data of the tooth restoration site, automatically remove image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data based on a distinction in the 3D x-ray image data between soft tissue and hard tissue, and demarcate, in the 3D dental impression image data, a preparation margin of a prepared tooth from which soft tissue was removed, in the tooth restoration site.

9. A system for according to claim 8, further comprising:

an optical camera configured to generate the 3D dental impression image data; and

an x-ray system configured to generate the 3D x-ray image data.

10. A system according to claim 9,

wherein the at least one processor further operates under control of the program to generate a model of the dental prosthetic based on the 3D dental impression data in which the image data corresponding to soft tissue in the tooth restoration site has been removed, and

wherein the system further comprises a milling system configured to fabricate a dental prosthetic based on the model of the dental prosthetic.

11. A system according to claim 8,

wherein the image data corresponding to soft tissue is image data on gingival tissue near a tooth within the tooth restoration site.

12. A system according claim 8,

wherein the at least one processor is included in a dental computer-aided design/computer-assisted manufacturing (CAD/CAM) device.

13. A non-transitory computer-readable medium storing sequences of instructions, the sequences of instructions including instructions which, when executed by a computer system, cause the computer system to:

register three-dimensional (3D) dental impression image data of a tooth restoration site and 3D x-ray image data of the tooth restoration site;

automatically remove image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data based on a distinction in the 3D x-ray image data between soft tissue and hard tissue; and

demarcate, in the 3D dental impression image data, a preparation margin of a prepared tooth from which soft tissue was removed, in the tooth restoration site.

14. A computer-readable medium according to claim 13,

wherein the instructions, when executed by the computer system, further cause the computer system to:

receive the 3D dental impression image data; and

receive 3D x-ray image data of the tooth restoration site.

15. A computer-readable medium according to claim 14,

wherein the instructions, when executed by the computer system, further cause the computer system to generate a model of a dental prosthetic based on the 3D dental impression image data in which the image data corresponding to soft tissue in the tooth restoration site has been removed.

16. A computer-readable medium according to claim 15,

wherein the instructions, when executed by the computer system, further cause the computer system to fabricate the dental prosthetic based on the model.

17. A computer-readable medium according to claim 13,

wherein the image data corresponding to soft tissue is image data on gingival tissue near a tooth within the tooth restoration site.

18. A procedure for creating a dental prosthetic, the procedure comprising:

registering three-dimensional (3D) dental impression image data of a tooth restoration site and 3D volume image data of the tooth restoration site;

automatically removing image data corresponding to soft tissue in the tooth restoration site from the 3D dental impression image data based on a distinction in the 3D volume image data between soft tissue and hard tissue; and

demarcating, in the 3D dental impression image data, a preparation margin of a prepared tooth from which soft tissue was removed, in the tooth restoration site.

19. A procedure according to claim 18, further comprising generating a model of a dental prosthetic based on the 3D dental impression image data in which the image data corresponding to soft tissue in the tooth restoration site has been removed.

20. A procedure according to claim 18,

wherein the 3D volume image data includes one or more scans generated by one of cone-beam computed tomography, tomosynthesis, ultrasonography, magnetic resonance imaging, and positron emission tomography.