Tooth produced in a mold, and dental prosthesis

Patent metadata

Field	Value
Publication number	US-9918812-B2
Application number	US-201314650434-A
Country	US
Kind code	B2
Filing date	Dec 6, 2013
Priority date	Dec 12, 2012
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The invention relates to a tooth made of ceramics, a composite or plastic, which is produced in a mold, said tooth having a basal surface ( 16 ) that comprises a trough ( 18 ). The especially elliptical or circular trough ( 18 ) is adapted to the basal surface ( 16 ) and has a trough edge ( 22, 24 ) which extends at least partially in an angle of more than 45 degrees, in particular more than 60 degrees or 70 degrees, with respect to the adjacent basal surface ( 16 ).

First claim

The invention claimed is:

1. A tooth made of ceramics, a composite or plastic comprising
a basal surface ( 16 ) with a depression ( 18 ) and a depression flank ( 22 , 24 ),
wherein the depression ( 18 ) is adaptable to the basal surface ( 16 ),
wherein the tooth can be produced in a mold,
wherein the depression flank ( 22 , 24 ) extends at least partially at an angle of more than 45 degrees towards the adjacent basal surface ( 16 ), and
wherein the depression ( 18 ) is provided with a depression bottom ( 26 ) that is formed to be at least partially convex and has a radius of convexity which amounts to at least 50% of the maximum extension of the basal surface ( 16 ), and
wherein both the depression bottom ( 26 ) and the surrounding basal surface ( 16 ) are essentially S-curved.

2. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) is essentially formed to be bowl-shaped, and the depression bottom ( 26 ) is formed to be essentially smooth and extends in a recessed fashion compared with the surrounding basal surface ( 16 ) essentially in parallel to the basal surface ( 16 ), with depression flanks ( 22 , 24 ) extending essentially perpendicular towards the depression bottom ( 26 ).

3. A tooth in accordance with claim 2 , characterized in that the depression ( 18 ) is elliptical- or circular-shaped.

4. A tooth in accordance with claim 1 , characterized in that one depression flank ( 22 , 24 ) extends at least partially at an angle of more than 60 degrees towards the adjacent basal surface ( 16 ), wherein adjacent to the depression bottom ( 26 ) the depression flank ( 22 , 24 ) extends at least partially at an angle of more than 60 degrees.

5. A tooth in accordance with claim 4 , characterized in that at least one depression flank ( 22 , 24 ) extends almost perpendicular to the basal edge surface.

6. A tooth in accordance with claim 4 , wherein the angle at which one depression flank ( 22 , 24 ) extends is more than 70 degrees towards the adjacent basal surface ( 16 ), and wherein the angle at which the depression flank ( 22 , 24 ) extends adjacent the depression bottom is more than 60 degrees.

7. A tooth in accordance with claim 4 , wherein the angle at which one depression flank ( 22 , 24 ) extends is more than 70 degrees towards the adjacent basal surface ( 16 ), and wherein the angle at which the depression flank ( 22 , 24 ) extends adjacent the depression bottom is more than 70 degrees.

8. A tooth in accordance with claim 1 , characterized in that at least one depression flank ( 22 , 24 ) is provided with at least one undercut, which is formed for providing a pre-determined retentional force, and that the undercut is formed at a pre-determined height at the depression flank ( 22 , 24 ).

9. A tooth in accordance with ding claim 1 , characterized in that a depression bottom ( 26 ) is formed as a surface extending three-dimensionally in space without any points of discontinuity.

10. A tooth in accordance with claim 1 , characterized in that a transition between basal surface ( 16 ) and depression flank ( 22 , 24 ) is formed as a hollow groove or fillet, with a radius which is distinctly smaller than the depth of the depression ( 18 ).

11. A tooth in accordance with claim 10 , characterized in that the size of the radius of the hollow groove or fillet is one tenth to one third the depth of the depression ( 18 ).

12. A tooth in accordance with claim 1 , characterized in that the depression bottom ( 26 ) is formed essentially smooth.

13. A tooth in accordance with claim 1 , characterized in that heights of the depression flanks ( 22 , 24 ), observed surrounding the depression ( 18 ), are essentially equal and the depression ( 18 ) is of an essentially consistent depth.

14. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) is surrounded by a basal edge surface ( 20 ), the basal edge surface having a width that remains essentially equally wide extending around the depression ( 18 ).

15. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) is surrounded by a basal edge surface ( 20 ) having a varying width, extending around the depression ( 18 ), between approximately 40% of the average width and approximately 200% of the average width.

16. A tooth in accordance with claim 15 , wherein the varying width, extending around the depression ( 18 ) is between 75 and 150% of the average width.

17. A tooth in accordance with claim 1 , characterized in that a minimum width of the depression ( 18 ) approximately corresponds to its depth.

18. A tooth in accordance with claim 17 , wherein the minimum width of the depression ( 18 ) is 1 mm, or is within 30% of 1 mm.

19. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) is surrounded by a basal edge surface ( 20 ) having a width observed in the radial direction of the depression ( 18 ) smaller than a radius of the depression, wherein the width, in the case of molars, varies over an extension of a circumference of the depression ( 18 ).

20. A tooth in accordance with claim 1 , characterized in that the depression is surrounded by a basal edge surface ( 20 ) having a width observed in the radial direction of the depression ( 18 ) smaller than a radius of the depression, wherein the width, in the case of incisors, does essentially not vary over an extension of a circumference of the depression ( 18 ).

21. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) takes out a volume from the basal surface ( 16 ) which corresponds to at least one twentieth of a volume of the tooth.

22. A tooth in accordance with claim 1 , characterized in that the depression ( 18 ) is positioned with a depression center essentially in a center of the basal surface ( 16 ) and wherein the depression center has a uniform distance to the edge of the basal surface ( 20 ) of approximately 0.8 to 1.5 mm.

23. A set of teeth, formed out of teeth in accordance with claim 1 , comprising sizes suiting to one another but differing from one another.

24. A set of teeth in accordance with claim 23 , characterized in that a diameter of the depression within one set of teeth is different and is adapted to a size of each respective tooth in the set, such that the width of the basal edge surface ( 20 ) remains essentially uniform in each tooth of the set.

Assignees

• Ivoclar Vivadent Ag

Inventors

• Hagenbuch Konrad
• Eder Marion
• Bertagnolli Martin
• Frei Christian
• Lanbacher Karl

Classifications

• A61C13/1006 Primary

  characterised by a tooth shape which improves retention · CPC title

• A61C13/081 Primary

  Making teeth by casting or moulding · CPC title

• A61C5/70

  Tooth crowns; Making thereof · CPC title