Method of making a dental restoration

Patent metadata

Field	Value
Publication number	US-10820970-B2
Application number	US-201816500850-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Apr 7, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A method of making a dental restoration has the steps of: determining a virtual space available for accommodation of a dental restoration for a tooth to be restored; retrieving a predefined virtual master dental restoration surface from a database; fitting the virtual master dental restoration surface in the space to provide a virtual outer dental restoration surface; creating a virtual inner dental restoration surface independent of a shape of the tooth to be restored; providing a virtual model of a dental restoration based on a combination of the virtual outer dental restoration surface and the virtual inner dental restoration surface; and fabricating the dental restoration based on the dental restoration model.

First claim

What is claimed is:

1. A method of making a dental restoration,:
determining a virtual space available for accommodation of a dental restoration for a tooth to be restored by capturing the shape of a patient's teeth at least in an area adjacent the tooth to be restored;
retrieving a predefined virtual master dental restoration surface from a database;
fitting the virtual master dental restoration surface in the space by three-dimensionally transforming the virtual master dental restoration surface to provide a virtual outer dental restoration surface;
creating a virtual inner dental restoration surface independent of a shape of the tooth to be restored;
providing a virtual model of a dental restoration based on a combination of the virtual outer dental restoration surface and the virtual inner dental restoration surface; and
fabricating the dental restoration based on the dental restoration model.

2. The method of claim 1 , wherein the virtual inner dental restoration surface is generated by a computer, based on the virtual outer dental restoration surface.

3. The method of claim 1 , wherein at least a portion of the virtual inner dental restoration surface is generated as a three-dimensional equidistant reduction of a corresponding portion of the virtual outer dental restoration surface based on an offset value that is representative of a wall thickness of the dental restoration.

4. The method of claim 3 , wherein the wall thickness is between 0.3 mm and 1.5 mm.

5. The method of claim 1 , wherein the three-dimensional transformation is performed by three-dimensionally proportionally scaling of the virtual master dental restoration surface.

6. The method of claim 1 , further comprising determining a height of the dental restoration model independent of any preparation margin of the tooth to be restored, wherein the dental restoration model has a tooth axis and wherein the height is defined by a dimension of the dental restoration model along the tooth axis.

7. The method of claim 6 , further comprising virtually trimming the dental restoration model based on the height.

8. The method of claim 1 , further comprising determining a tooth color for the dental restoration and providing a dental material from which the dental restoration is fabricated based on the tooth color.

9. The method of claim 1 , wherein the dental restoration is fabricated by 3D printing of a light hardenable resin.

10. The method of claim 9 , wherein the light hardenable resin is based on a composition comprising: reactive monomers, photo initiators.

11. The method of claim 1 , wherein the finished dental restoration has an outer shape that corresponds to the shape of the virtual outer dental restoration surface or a three-dimensionally proportional reduction or enlargement thereof.

12. The method of claim 1 , wherein the shape of the patient's teeth are captured by intra-oral optical scanning.

13. The method of claim 1 , further comprising displaying, in combination, (i) the shape of the patient's teeth at least in the area adjacent the tooth to be restored and (ii) the virtual master dental restoration surface, and wherein the fitting of the virtual master dental restoration model into the space is performed by a user by optical control based on the combination (i) and (ii) displayed.

14. The method of claim 1 , being performed prior to any invasive treatment of the tooth to be restored.

15. The method of claim 1 , comprising:
determining a second virtual space available for accommodation of a second dental restoration for a second tooth to be restored by capturing the shape of a second patient's teeth at least in an area adjacent the second tooth to be restored;
retrieving the same predefined virtual master dental restoration surface from the database;
fitting the virtual master dental restoration surface in the second space by three-dimensionally transforming the virtual master dental restoration model to provide a second virtual outer dental restoration surface;
creating a second virtual inner dental restoration surface independent of a shape of the second tooth to be restored;
providing a virtual model of a second dental restoration based on a combination of the second virtual outer dental restoration surface and the second virtual inner dental restoration surface; and
fabricating the second dental restoration based on the second dental restoration model.

Assignees

• 3M Innovative Properties Co

Inventors

• Kirchner Bastian
• Korten Malte
• Schechner Gallus

Classifications

• A61C13/087

  Artificial resin teeth {(A61C13/081 takes precedence; preparations A61K6/80)} · CPC title

• A61C13/082

  Cosmetic aspects, e.g. inlays; Determination of the colour (A61C19/10 takes precedence) · CPC title

• A61C13/0019

  using three dimensional printing · CPC title

• A61C13/0004 Primary

  Computer-assisted sizing or machining of dental prostheses · CPC title

• A61C9/0053

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