Comparison of color images of three-dimensional dental structures

Patent metadata

Field	Value
Publication number	US-12045984-B2
Application number	US-202117475402-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Oct 13, 2020
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

The present invention relates to a method for comparing three-dimensional dental structures, comprising the steps of acquiring (S 101 ) a target data set representing the shape and optical properties of a natural tooth; rendering (S 102 ) a digital tooth model ( 200 ) to generate an actual data set representing the shape and optical properties of the digital tooth model; determining (S 104 ) a first comparison value from the actual data set; determining (S 105 ) a second comparison value from the target data set; and determining (S 106 ) a deviation based on the first and second comparison values.

First claim

The invention claimed is:

1. A method for comparing three-dimensional dental structures, comprising the steps:
acquiring (S 101 ) a target data set (DS-S) representing the shape and optical properties of a natural tooth ( 100 );
rendering (S 102 ) of a digital tooth model ( 200 ) to generate an actual data set (DS-I) representing the shape and optical properties of the digital tooth model ( 200 );
determining (S 104 ) a first comparison value from the actual data set (DS-I);
determining (S 105 ) a second comparison value from the target data set (DS-S);
determining (S 106 ) a deviation (ΔE S,I ) based on the first and second comparison values;
wherein the target data set (DS-S) is scaled such that an overlay with the actual data set (DS-I) in the same coordinate system is achieved or the actual data set (DS-I) is scaled such that an overlay with the target data set (DS-I) in the same coordinate system is achieved and the first and second comparison values are obtained from a region of the coordinate system; and
using the determined deviation to manufacture a dental restoration.

2. The method according to claim 1 , wherein the first and second comparison values are obtained along a grid or along lines within the coordinate system.

3. The method according to claim 1 , wherein the deviation (ΔE S,I ) is determined based on a Euclidean distance of the first and the second comparison values.

4. The method according to claim 1 , wherein an image noise of the target data set (DS-S) and/or the actual data set (DS-I) is reduced by a filter.

5. The method according to claim 1 , wherein the target data set (DS-S) and/or the actual data set (DS-I) comprises a two-dimensional image.

6. The method according to claim 5 , wherein the target data set (DS-S) and/or the actual data set (DS-I) comprises several two-dimensional images from several viewing angles.

7. The method according to claim 6 , wherein the deviation (ΔE S,I ) is determined based on a plurality of first and second comparison values in different two-dimensional images.

8. The method according to claim 1 , wherein the target data set (DS-S) and/or the actual data set (DS-I) comprises a three-dimensional shape.

9. The method according to claim 8 , wherein the deviation (ΔE S,I ) is determined based on a plurality of first and second comparison values at the same respective positions on the surface of the three-dimensional shape.

10. The method according to claim 1 , wherein the coordinate system is a two-dimensional or a three-dimensional coordinate system.

11. The method according to claim 1 , wherein the target data set is acquired by means of an electronic camera and/or a 3D scanner.

12. A computer device for comparing three-dimensional dental structures, comprising a sensor for acquiring a target data set based on a natural tooth, which is suitable for carrying out a method comprising
acquiring (S 101 ) a target data set (DS-S) representing the shape and optical properties of a natural tooth ( 100 );
rendering (S 102 ) of a digital tooth model ( 200 ) to generate an actual data set (DS-I) representing the shape and optical properties of the digital tooth model ( 200 );
determining (S 104 ) a first comparison value from the actual data set (DS-I);
determining (S 105 ) a second comparison value from the target data set (DS-S);
determining (S 106 ) a deviation (ΔE S,I ) based on the first and second comparison values;
wherein the target data set (DS-S) is scaled such that an overlay with the actual data set (DS-I) in the same coordinate system is achieved or the actual data set (DS-I) is scaled such that an overlay with the target data set (DS-I) in the same coordinate system is achieved and the first and second comparison values are obtained from a region of the coordinate system; and
using the determined deviation to manufacture a dental restoration.

13. A computer device comparing three-dimensional dental structures, comprising a sensor for acquiring a target data set based on a natural tooth and a computing unit with at least one algorithm that is configured to perform a method comprising
acquiring (S 101 ) a target data set (DS-S) representing the shape and optical properties of a natural tooth ( 100 );
rendering (S 102 ) of a digital tooth model ( 200 ) to generate an actual data set (DS-I) representing the shape and optical properties of the digital tooth model ( 200 );
determining (S 104 ) a first comparison value from the actual data set (DS-I);
determining (S 105 ) a second comparison value from the target data set (DS-S);
determining (S 106 ) a deviation (ΔE S,I ) based on the first and second comparison values;
wherein the target data set (DS-S) is scaled such that an overlay with the actual data set (DS-I) in the same coordinate system is achieved or the actual data set (DS-I) is scaled such that an overlay with the target data set (DS-I) in the same coordinate system is achieved and the first and second comparison values are obtained from a region of the coordinate system; and
using the determined deviation to manufacture a dental restoration.

14. A computer program product comprising program code which is stored on a non-transitory machine-readable medium, the machine-readable medium comprising computer instructions executable by a computer device comprising a sensor for acquiring a target data set based on a natural tooth, to perform a method comprising
acquiring (S 101 ) a target data set (DS-S) representing the shape and optical properties of a natural tooth ( 100 );
rendering (S 102 ) of a digital tooth model ( 200 ) to generate an actual data set (DS-I) representing the shape and optical properties of the digital tooth model ( 200 );
determining (S 104 ) a first comparison value from the actual data set (DS-I);
determining (S 105 ) a second comparison value from the target data set (DS-S);
determining (S 106 ) a deviation (ΔE S,I ) based on the first and second comparison values;
wherein the target data set (DS-S) is scaled such that an overlay with the actual data set (DS-I) in the same coordinate system is achieved or the actual data set (DS-I) is scaled such that an overlay with the target data set (DS-I) in the same coordinate system is achieved and the first and second comparison values are obtained from a region of the coordinate system; and
using the determined deviation to manufacture a dental restoration.

15. A computer program product comprising program code which is stored on a non-transitory machine-readable medium, the machine-readable medium comprising computer instructions executable by a processor, which computer instructions cause the processor to perform a method comprising
acquiring (S 101 ) a target data set (DS-S) representing the shape and optical properties of a natural tooth ( 100 );
rendering (S 102 ) of a digital tooth model ( 200 ) to generate an actual data set (DS-I) representing the shape and optical properties of the digital tooth model ( 200 );
determining (S 104 ) a first comparison value from the actual data set (DS-I);
determining (S 105 ) a second comparison value from the target data set (DS-S);
determining (S 106 ) a deviation (ΔE S,I ) based on the first and second comparison values;
wherein the target data set (DS-S) is scaled such that an overlay with the actual data set (DS-I) in the same coordinate system is achieved or the actual data set (DS-I) is scaled such that an overlay with the target data set (DS-I) in the same coordinate system is achieved and the first and second comparison values are obtained from a region of the coordinate system; and
using the determined

Assignees

• Ivoclar Vivadent Ag

Inventors

• Jussel Rudolf
• Niedrig Christian
• John Hendrik

Classifications

• G06F2113/10

  Additive manufacturing, e.g. three-dimensional [3D] printing · CPC title

• G06T7/0014 Primary

  using an image reference approach · CPC title

• G06F30/10 Primary

  Geometric CAD · CPC title

• G06T5/70

  Denoising; Smoothing · CPC title

• G06T15/00

  Three-dimensional [3D] image rendering · CPC title