Method for producing a dental restoration part and CAD/CAM device

Patent metadata

Field	Value
Publication number	US-9662188-B2
Application number	US-201213371893-A
Country	US
Kind code	B2
Filing date	Feb 13, 2012
Priority date	Feb 14, 2011
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

The invention relates to a method for producing a dental restoration part, in which method, geometrical data, in particular data with respect to spatial dimensions, position and/or volume of the restoration part, are determined and stored in order to form a virtual restoration part. In a further process step, the virtual restoration part is provided for the tooth ( 10 ) to be replaced by using data of the tooth ( 10 ) to be replaced, a neighboring tooth ( 60 ) and/or a tooth stump, and said data is stored as color data and is used for the computer-assisted production of the virtual restoration part.

First claim

What is claimed is:

1. A method for producing a dental restoration part from a virtual restoration part using geometrical data of the virtual restoration part, comprising:
generating color data as three-dimensional, stereometrically generated data based on at least a tooth to be restored or replaced, one or more neighboring teeth of the tooth to be restored or replaced, or a tooth stump of the tooth to be restored or replaced;
dividing the color data into a plurality of individual, three-dimensional sections extending through the virtual restoration part;
determining the differences of the sections with respect to individual color parameters and allocating tooth colors to be used;
conditioning and storing the tooth colors;
converting the tooth colors into machine-readable data for the production of the dental restoration part;
transferring the machine readable data to a computer assisted manufacturing (CAM) device;
building the color-adjusted dental restoration part in layers using dental material of different tooth colors,
wherein the color data is produced by creating a three-dimensional color photo, wherein at least two different positions of at least one camera from different angular positions take a photo of a neighboring tooth and/or a tooth stump for the dental restoration part, which color photos are stereometrically superimposed thereby creating a 3D image, wherein the created three-dimensional color photo is rendered, and the virtual dental restoration part is simulated on the screen and is compared to the color photos of the neighboring tooth, and
wherein the virtual dental restoration part is adjustable with respect to thickness, transparency, and material selection after optical comparison with the neighboring tooth, and when the optical comparison does not meet a predetermined criteria, the virtual dental restoration is rendered again, until the comparison meets the predetermined criteria, before CAM manufacturing of the dental restoration part such that no actual dental restoration part is necessary for comparison to neighboring teeth.

2. The method of claim 1 , wherein the dental material is subsequently cured or solidified.

3. The method of claim 2 , wherein the geometrical data comprises at least one of a spatial dimension, a position or a volume of the restoration part.

4. The method as claimed in claim 1 , wherein, upon determination of the tooth colors to be used, at least one section or a plurality of sections from the set of three-dimensional sections is displayed on a screen and is selected; and
the tooth colors of the selected section or of the selected sections is compared to stored tooth colors that are stored in a layering database;
wherein on said screen, a tooth color detected, colors of individual layer materials, thickness of the individual layers, thickness of incisal material and/or translucency in percent are represented in a spatially associated manner with respect to the selected section.

5. The method as claimed in claim 4 , wherein a determination of the tooth colors is performed when selecting the one or more sections, and the respective tooth color of the one or more sections is stored in a work table by confirming on the screen, said work table forming the base for the CAM production of the dental restoration part.

6. The method as claimed in claim 1 , wherein the size of the three-dimensional sections and/or the thickness of the layers is enlarged by one correction factor that takes into account empirical values during the solidification of the dental material and the shrinkage arising at a position.

7. The method as claimed in claim 6 , wherein the dental material that is used for solidification, is at least partially polymerizable and is polymerized.

8. The method as claimed in claim 7 , wherein the building of the restoration is performed by a Rapid-Prototyping Process.

9. The method as claimed in claim 8 , wherein the Rapid-Prototyping Process comprises Ink-Jet-Printing and the solidification takes place through cooling down.

10. The method as claimed in claim 9 , wherein building the dental restoration forms a ceramic green body that is sintered for solidification.

11. The method as claimed in claim 9 , wherein the creation of the virtual dental restoration part is performed by using a data base in which different tooth shapes and/or tooth runs are presented in a three-dimensionally stored form, from which the layers are configured.

12. A CAD/CAM device for the production of a dental restoration part based on geometrical data, wherein the geometrical data determines the geometrical shape of the dental restoration part to be produced, are based on color data that characterize the dental restoration part to be produced; and are generated from either a tooth data base or a neighboring tooth of the dental restoration part to be produced and/or the tooth stump thereof, wherein the device comprises
a first component that stereometrically detects the color data three-dimensionally;
a second component that divides the color data generated into a plurality of individual, three-dimensional sections extending through the restoration part;
a third component that determines layers of dental material from which the dental restoration part is to be produced;
a fourth component that determines manually or automatically for the at least one section and/or the plurality of united sections, tooth colors;
a fifth component for storing the tooth colors in a work table as tooth color data;
a sixth component for transferring the tooth color data to a CAM device; and
a seventh component for building up the dental restoration part in layers;
wherein the first component comprises at least one digital camera that detects the color data at two positions, said positions differing from each other in a horizontal direction and being located in a vertical direction at the same vertical height, or differing in the vertical direction and being located at the same position in the horizontal direction; and
wherein the device comprises a display with a cursor and the three-dimensional sections are represented on the display and are selected, and in that based on the selection a comparison of a surface color with stored tooth colors of a layering data base is effected and thereby different parameters of sections are represented on the display and are confirmed or adjusted with respect to thickness, transparency, and material selection after optical comparison with a neighboring tooth, and when the comparison does not meet a predetermined criteria, the different parameters are rendered again until the comparison meets the predetermined criteria, before CAM manufacturing of the dental restoration part such that no actual dental restoration part is necessary for comparison to neighboring teeth.

13. The CAD/CAM device as claimed in claim 12 , further comprising an eighth component for curing or solidifying the layers.

14. The CAD/CAM device as claimed in claim 12 , wherein the stereometrically detected colors may be provided in two dimensions with the aid of taking pictures, or in a third dimension, in the direction of the Z-coordinate, with aid of already existing data.

15. The CAD/CAM device as claimed in claim 14 , wherein the already existing data is from an already existing dental restoration part.

16. The CAD/CAM device as claimed in claim 12 , wherein the first component comprises one or two digital cameras.

17. The CAD/CAM device as claimed in claim 16 , wherein the one digital camera is positioned on at least two different positions.

Assignees

• Laubersheimer Jürgen
• Murr Wolfram
• Rohner Gottfried
• Schlechtriemen Nadja
• Ivoclar Vivadent Ag

Inventors

• Laubersheimer Jürgen
• Murr Wolfram
• Rohner Gottfried
• Schlechtriemen Nadja

Classifications

• A61C13/0004 Primary

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

• A61C13/0013

  using stereolithographic techniques · CPC title

• A61C13/0019

  using three dimensional printing · CPC title

• A61C9/0053

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

• A61C13/09

  {Composite teeth, e.g. front and back section (A61C13/0835, A61C13/1023 take precedence)}; Multilayer teeth · CPC title