Device and method for holding prosthetic teeth

Patent metadata

Field	Value
Publication number	US-11039904-B2
Application number	US-201615779112-A
Country	US
Kind code	B2
Filing date	Dec 1, 2016
Priority date	Dec 4, 2015
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A method for producing a dental prosthesis, and a dental prosthesis made according to the method, the method having the following chronological steps:a) producing a first, provisional dental prosthesis comprising a prosthetic base and provisional prosthetic teeth having occlusal surfaces, whereby data that indicate at least a 3-dimensional form of the occlusal surfaces are stored or have been stored as data record A,b) after subtractive occlusal processing of at least one of the provisional prosthetic teeth, determining at least the 3-dimensional occlusal surfaces of the processed provisional prosthetic teeth, or determining the 3-dimensional surface of the first dental prosthesis is determined as a whole,c) storing data that indicate at least a form of the 3-dimensional occlusal surfaces as data record B,d) calculating, via a computer comparison of data record B with data record A, differences in the forms of the provisional prosthetic teeth before and after subtractive occlusal processing and, from this, calculating at least desired lengths for final prosthetic teeth, ande) producing said final prosthetic teeth at least with the calculated desired length using a CAM method from virtual models of the final prosthetic teeth, whereby the desired length is set by a basal shortening of the virtual models of the final prosthetic teeth, and the final prosthetic teeth produced in such a manner are firmly connected to the at least one first prosthetic base or at least one second prosthetic base.

First claim

The invention claimed is:

1. A method for producing a dental prosthesis comprising the following chronological method steps:
a) producing a first, provisional dental prosthesis comprising at least one first prosthetic base and several provisional prosthetic teeth, whereby data that indicate at least a 3-dimensional form of occlusal surfaces of the provisional prosthetic teeth of the provisional dental prosthesis are stored as data record A or have already been stored as data record A;
b) subtractive occlusal processing at least one of the provisional prosthetic teeth wherein basal sides of the provisional prosthetic teeth remain unprocessed, and then determining at least the 3-dimensional occlusal surfaces of the processed provisional prosthetic teeth of the first dental prosthesis, or determining a 3-dimensional surface of the first dental prosthesis as a whole;
c) storing data that indicate at least one said 3-dimensional form of the occlusal surfaces of the processed provisional prosthetic teeth as data record B;
d) calculating, via a computer comparison of data record B with data record A, differences in the forms of the provisional prosthetic teeth before and after the subtractive occlusal processing and, from this, calculating at least desired lengths for final prosthetic teeth; and
e) producing said final prosthetic teeth at least with the calculated desired length using a CAM method from virtual models of the final prosthetic teeth, whereby the desired length of the final prosthetic teeth is set by a basal shortening of the virtual models of the final prosthetic teeth wherein occlusal sides of the virtual models remain unprocessed before connecting the final prosthetic teeth to the at least on first prosthetic base or at least one second prosthetic base, and firmly connecting the final prosthetic teeth, which have been produced in such a manner, to the at least one first prosthetic base or the at least one second prosthetic base.

2. The method according to claim 1 comprising testing in step e) the desired lengths of the virtual models of the final prosthetic teeth and/or a position and/or a location of the virtual models of the final prosthetic teeth in a final dental prosthesis to be produced aided by a virtual articulator with regard to an occlusion of the final dental prosthesis to be produced.

3. The method according to claim 1 , comprising determining and storing in steps b) and c), alongside the 3-dimensional occlusal surfaces, positions of the processed provisional prosthetic teeth in the first prosthetic base as data record B2 and/or determining and storing in steps b) and c), as well as the 3-dimensional occlusal surfaces, orientations of the processed provisional prosthetic teeth in the first prosthetic base as data record B3, and
in step d) using a computer comparison of the data record B2 with a data record A2, whereby in the data record A2 the positions of the non-processed provisional prosthetic teeth in the first dental prosthesis are stored, and/or using a computer comparison of the data record B3 with a data record A3, whereby in the data record A3 the orientations of the non-processed provisional prosthetic teeth are stored in the first dental prosthesis, calculating the differences between the forms and the positions and/or orientations of the provisional prosthetic teeth before and after the subtractive occlusal processing and, from this, calculating desired forms and positions and/or orientations for final prosthetic teeth.

4. The method according to claim 1 , comprising conducting the subtractive occlusal processing of at least one of the provisional prosthetic teeth during a fitting of the first, provisional dental prosthesis on the patient.

5. The method according to claim 1 , comprising generating in step a) the data record A via an imaging identification, at least the 3-dimensional form of the occlusal surfaces of the non-processed provisional prosthetic teeth of the first provisional dental prosthesis or generating via an imaging identification, a 3-dimensional surface of the first dental prosthesis as a whole.

6. The method according to claim 1 , comprising calculating in step d), the desired lengths for the final prosthetic teeth, and desired forms, orientations and/or positions for the final prosthetic teeth.

7. The method according to claim 1 , comprising using, to produce the first provisional dental prosthesis in step a), data recorded in the mouth cavity of the patient, data recorded on a model of the mouth cavity and/or data relating to articulation.

8. The method according to claim 1 , comprising producing the at least one first prosthetic base with a CAM method.

9. The method according to claim 1 , comprising producing the final prosthetic teeth using a 3D printing method, through milling from a block with a CAM method or through basal shortening of prefabricated prosthetic teeth.

10. The method according to claim 1 , comprising detachably connecting the provisional prosthetic teeth to the at least one first prosthetic base.

11. The method according to claim 1 , comprising positioning the provisional prosthetic teeth in relation to their longitudinal axis with a precision of at least 200 μm with regard to the at least one first prosthetic base in the first provisional dental prosthesis.

12. The method according to claim 1 , comprising in step a), connecting each of the provisional prosthetic teeth of the first dental prosthesis to one of the at least one first prosthetic base.

13. A dental prosthesis produced with a method according to claim 1 .

14. The method according to claim 2 , comprising correcting the desired lengths of the virtual models of the final prosthetic teeth and/or the position and/or the location of the virtual models of the final prosthetic teeth in the at least one first prosthetic base and/or modifying the forms of the final prosthetic teeth based on the test of the virtual articulator in such a manner that an improved occlusion of the virtual model of the final dental prosthesis in the virtual articulator is achieved.

15. The method according to claim 14 , comprising modifying basal forms of the final prosthetic teeth.

16. The method according to claim 5 , comprising generating in step a) the data record A via an imaging identification, by scanning in with a scanner, at least the 3-dimensional form of the occlusal surfaces of the provisional prosthetic teeth of the first dental prosthesis or generating via an imaging identification, by scanning in with a scanner, the 3-dimensional surface of the first provisional dental prosthesis as a whole.

17. The method according to claim 7 , comprising producing the first provisional dental prosthesis in step a) with a CAD/CAM method.

18. The method according to claim 8 , comprising printing the at least one first prosthetic base with a CAM method from plastic.

19. The method according to claim 18 , comprising printing the at least one first prosthetic base with a CAM method from a plastic with a gum appearance.

20. The method according to claim 10 , comprising detachably connecting the provisional prosthetic teeth to the at least one first prosthetic base, by inserting into holding recesses in the at least one first prosthetic base such that the provisional prosthetic teeth are held in the holding recesses in a press fit.

21. The method according to claim 11 , comprising positioning the provisional prosthetic teeth in relation to their longitudinal axis with a precision of at least 100 μm with regard to

Assignees

• Kulzer & Co Gmbh

Inventors

• Boehm Uwe
• Woldegergis Yohannes

Classifications

• A61C13/0004 Primary

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

• A61C13/097

  characterised by occlusal profiles {, i.e. chewing contact surfaces} · CPC title

• A61C13/0001

  In-situ dentures; Trial or temporary dentures · CPC title

• A61C13/0006

  Production methods · CPC title

• A61C13/0019

  using three dimensional printing · CPC title