Method for producing a prosthesis or partial prosthesis

Patent metadata

Field	Value
Publication number	US-11090141-B2
Application number	US-201716324343-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Aug 10, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A method for producing a prosthesis or partial prosthesis based on digital data, using multiple teeth present in a dental arch ( 14 ) and a prosthesis base to be produced. The prosthesis base is rough-milled by a milling tool, i.e. is milled in a first step, and the prosthesis base present as a semi-finished product, in particular in regions of the prosthesis base on which the teeth and the prosthesis base abut against each another and/or are to be bonded to each other, is partially milled, i.e. is milled in a second step, by a different milling tool, thereby being brought to a target height which corresponds to the desired bonding gap between the prosthesis base and the tooth or dental arch ( 14 ).

First claim

The invention claimed is:

1. A method for producing a prosthesis or partial prosthesis based on digital data, having a plurality of teeth in a dental arch and a prosthesis base comprising
rough-milling the prosthesis base with a first milling tool, to a semi-finished prosthesis base,
finish-milling the semi-finished prosthesis base with a second milling tool in regions of the prosthesis base, on which the teeth and the prosthesis base abut against one another and/or are to be bonded to one another,
wherein the semi-finished prosthesis base is milled to a target height in the finish-milling step, which target height corresponds to the abutment between the prosthesis base and the teeth or dental arch plus the desired bonding gap between the prosthesis base and the teeth or dental arch.

2. The method according to claim 1 , comprising
rough-milling the dental arch from a tooth-colored blank, and
finish-milling a basal surface of the teeth of the dental arch and any gingival regions of the dental arch adjacent to the basal surface of the teeth.

3. The method according to claim 2 , comprising
gluing the dental arch with adhesive into dental cavities of the prosthesis base,
curing the adhesive to connect the dental arch and prosthesis base, and
finish-milling at locations where only rough-milled areas exist.

4. The method according to claim 2 , comprising
using a roughing cutter during rough-milling of the prosthesis base having a cutting depth between 0.7 mm and 2.5 mm or between 1.0 mm and 2.0 mm,
using a finish-milling tool during finish-milling of the prosthesis base having a cutting depth between 0.1 mm and 0.5 mm,
using a roughing cutter during rough-milling of the dental arch or partial dental arch having a cutting depth of between 0.6 mm and 2.2 mm, and/or
using a finish-milling tool when finishing the dental arch or partial dental arch having a cutting depth between 0.1 mm and 0.4 mm.

5. The method according to claim 3 , comprising
providing an adhesive joint between the dental arch or partial dental arch and the prosthesis base having a thickness of between 0.08 mm and 0.22 mm, and
using a relative position of the partial dental arch or dental arch in the cavities of the prosthesis base for height/side/angle correction of the connected dental or partial dental arch and prosthesis base.

6. The method according to claim 3 , comprising
following application of the adhesive and following bonding of the dental arch into the cavities of the prosthesis base and curing of the adhesive between the dental arch and the prosthesis base, finish-milling the dental arch in a workpiece holder of the milling machine while exclusively clamping the prosthesis base.

7. The method according to claim 3 , comprising
adapting a basal geometry of the dental arch to associated shapes of the cavities of the prosthesis base, or
adapting the associated shapes of the cavities of the prosthesis base to the basal geometry of the dental arch, and,
wherein the geometry and associated shapes are flatter and wider in the molar region and narrower and deeper in the incisor region.

8. The method according to claim 3 ,
wherein the gingival regions of the dental arch are trapezoidally milled, forming preformed contact surfaces opposite the cavities in the prosthesis base.

9. The method according to claim 1 ,
comprising
fabricating the dental arch for producing the prosthesis from a material comprising plastic having a hardness/strength which is greater than a hardness/strength of the prosthesis base material, and
wherein the material further comprises fillers.

10. The method according to claim 9 , comprising
fabricating the dental arch from a plastic material and polymethyl methacrylate (PMMA) bead polymer fillers and/or highly crosslinked prepolymer fillers which are surrounded by a diffusion layer.

11. The method according to claim 9 , comprising
fabricating the dental arch from a plastic material and PMMA bead polymer fillers and/or highly crosslinked prepolymer fillers which are surrounded by a diffusion layer,
wherein the fillers are present in the plastic material in an amount of greater than 0 to up to 20 wt. % of the total weight of the plastic material and fillers.

12. A method for producing a prosthesis based on digital data comprising
producing a substantially U-shaped dental arch for subsequently holding teeth from a tooth-colored material in the form of a blank,
leaving behind holding bars between the U-shaped dental arch and the blank as a semi-finished product,
rough-milling teeth in the U-shaped dental arch wherein the teeth have an oversize in relation to a size of the desired teeth of the prosthesis,
fine-milling a basal region in the dental arch having a basal surface and surfaces adjoining the basal surface for being received in a prosthesis base, and
gluing or fastening the dental arch into the prosthesis base.

13. The method according to claim 1 comprising,
rough-milling the prosthesis base comprising milling a flat cylindrical disc of prosthesis base material into an outer contour that is substantially U-shaped.

14. The method according to claim 1 , comprising
using roughing cutters having tools with diameters between 0.8 mm and 6 mm, and
using finishing cutters having tools with diameters between 0.5 mm and 3 mm or equal to or less than 2.5 mm.

15. The method according to claim 1 , comprising
leaving holding bars on the dental arch during rough-milling from a blank disc,
wherein the dental arch produced by rough-milling comprises a rounded cross-section in an incisal area of the dental arch, and a basal surface and side surfaces converging towards said basal surface in a gingival area of the dental arch, and
wherein the dental arch is essentially U-shaped.

16. The method according to claim 1 , comprising
prefabricating dental arches having substantially a U-shape in multiple sizes, and
selecting the size of the dental arch most suitable for the prosthesis to be manufactured,
wherein the prefabricated dental arches are prefabricated by milling or pressing processes.

17. The method according to claim 16 , comprising
prefabricating dental arches in at least 3 sizes.

18. The method for producing a prosthesis according to claim 12 ,
producing the substantially U-shaped dental arch from a tooth-colored material blank fabricated of PMMA with fillers.

19. The method for producing a prosthesis according to claim 12 , comprising
finish-milling the glued or fastened prosthesis base and dental arch.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Baaske Thomas
• Krybus Robert Wolfgang

Classifications

• A61C13/087

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

• A61C13/0022

  Blanks or green, unfinished dental restoration parts · CPC title

• A61C13/1016

  Methods or apparatus for mounting, holding or positioning a set of teeth · CPC title

• A61C13/1003

  by embedding in base material · CPC title

• A61C13/1013

  Arch forms · CPC title