Molded member made of form-stabilized material and method for the manufacture thereof

• US 9,681,931 B2
• Filed: 12/16/2013
• Issued: 06/20/2017
• Est. Priority Date: 07/21/2008
• Status: Active Grant

• Current Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Original Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Inventors: Bibus, Joachim, Schmid, Andreas, Thiel, Norbert, Albarski, Olivia, Dorn, Michael, Aechtner, Stefan
• Primary Examiner(s): HAUTH, GALEN H
• Application Number:
  US14/106,990
• Publication Number:
  US 20140106308A1
• Time in Patent Office: 1,282 Days
• Field of Search: 264 20
• CPC Class Codes: A61C 13/0004 Computer-assisted sizing or machining of dental prostheses
• CPC Class Codes: A61C 13/0022 Blanks or green, unfinished dental restoration parts
• CPC Class Codes: A61C 13/08 Artificial teeth; Making same kilns for artificial teeth F27B
• CPC Class Codes: A61C 13/081 Making teeth by casting or moulding
• CPC Class Codes: A61C 13/082 Cosmetic aspects, e.g. inlays; Determination of the colour A61C19/10 takes precedence
• CPC Class Codes: A61C 5/77 Methods or devices for making crowns
• CPC Class Codes: A61K 6/824 comprising transition metal oxides
• CPC Class Codes: Y10T 428/24521 with component conforming to contour of nonplanar surface

Abstract

Molded member made of form-stabilized material, comprising at least one first component and one second component, characterized in that the second component has a different pigmentation than the first component and the second component is disposed inside the first element, forming a boundary surface, in such a way that the boundary surface represents a spatially curved surface.

Claims

1. A process for preparing a molded form-stabilized member comprising the steps of

a) filling a mold with the at least one first component comprising a pigmentation,

b) compressing the at least one first component in the mold to form in the at least one first component a depression having a surface curved in space,

c) filling the depression with at least one second component comprising a different pigmentation than the first component, and

d) compressing the at least one second component in the depression, such that the surface curved in space forms an interface, curved in space towards the at least one second component, between the at least one first and second components, thereby producing the molded form-stabilized member,

wherein the interface (16) is essentially described by a family of parabolas, whereby the second component (14) has an essentially parabolic border line (42, 44, 46) towards the first component in a cross-sectional plane (36, 38, 40),

wherein continuously decreasing maximums (48) go through at least 50% of the second component (14) in a taper direction (52),

Wherein the second component (14) respectively has an essentially parabolic border line (42, 44, 46) in all mutually parallel cross-sectional planes (36, 38, 40), and

wherein the essentially parabolic border lines (42, 44, 46) have continuously decreasing maximums (48), starting from a major cross-sectional phase (22) in the taper direction (52)and extending perpendicular to the major corss-sectional plane (22).

2. The process according to claim 1, wherein (i) each of the first and second components further comprises sinterable ceramic material or (ii) each of the first and second components further comprises plastic material.

3. The process according to claim 2 further comprising, after the filling and compressing step (c), the step of curing the first and second components at an elevated temperature under pressure, when each of the first and second components further comprises plastic material.

4. The process according to claim 1, wherein the interface constitutes a surface at least partially corresponding to a course of the dentin/enamel border of natural or artificial teeth.

5. The process according to claim 2 further comprising, after the filling and compressing step (c), the step of sintering the first and second components, when each of the first and second components further comprises sinterable ceramic material.

6. In a process of making a dental restoration comprising working a dental-restoration material, the improvement wherein the dental restoration material is a molded form-stabilized member produced by the process of claim 1.

7. The process of claim 6, wherein the dental-restoration material is worked by CAD/CAM methods.

8. The process of claim 1

wherein the interface is constituted by at least

partially corresponding to a section made through a set of natural or artificial teeth.

9. The process according to claim 8, wherein the course of the dentin/enamel border is in at least 80% accordance with the interface.

10. The process according to claim 1, wherein the pigmentation and different pigmentation serve to adjust at least one of translucency and color of the first and second components.

11. The process according to claim 1, wherein each of the pigmentation and different pigmentation comprises a translucency adjusting opaquer.

12. The process according to claim 1, wherein each of the pigmentation and different pigmentation further comprises a color adjusting pigment.

13. The process according to claim 1, wherein the continuously decreasing maximums (48) go through at least 75% of the second component (14) in the taper direction (52).

14. The molded member according to claim 1, wherein the continuously decreasing maximums (48) lie in a common plane (50) extending in the taper direction (52).

15. The molded member according to claim 1, wherein the continuously decreasing maximums (48) lie in a common plane (50) extending in the taper direction (52), wherein the common plane (50) is a plane of symmetry for the second component (14).

16. The molded member according to claim 1, wherein at least one end (34) of the essentially parabolic border line (42, 44, 46) merges into a curve of opposite curvature.