RADIOOPAQUE PEEK BASED BLOCK FOR USE IN A CAD/CAM SYSTEM FOR THE MANUFACTURE OF A DENTAL RESTAURATION

Abstract

Block for use in a CAD/CAM system for the manufacture of a dental restauration, said block consisting of a thermoplastic polymer comprising PEEK including radiopaque particles selected from the group comprising BaZrO.sub.3, YbF.sub.3, Yb.sub.2O.sub.3, SrO, SrZrO.sub.3, SiO.sub.2ZrO.sub.2, SiO.sub.2Yb.sub.2O.sub.3, Lu.sub.2O.sub.3, LUF.sub.3.

Claims

1-8. (canceled)

9. A block for use in a CAD/CAM system for the manufacture of a dental restauration, said block consisting of a thermoplastic polymer comprising PEEK including radiopaque particles selected from the group comprising BaZrO3, YbF3, Yb2O3, SrO, SrZrO3, SiO2ZrO2, SiO2Yb2O3, Lu2O3, LuF3.

10. The block according to claim 9, wherein radiopaque particles are selected among YbF3, Yb2O3.

11. The block according to claim 9, wherein radiopaque particles are selected among LuF3, Lu2O3.

12. The block according to claim 9, wherein the radiopaque particles have a particle size lower than 1 m.

13. The block according to claim 12, wherein the radiopaque particles have a particle size of from 0.2 m to 0.9 m.

14. The block according to claim 10, wherein the radiopaque particles have a particle size lower than 1 m.

15. The block according to claim 14, wherein the radiopaque particles have a particle size of from 0.2 m to 0.9 m.

16. The block according to claim 11, wherein the radiopaque particles have a particle size lower than 1 m.

17. The block according to claim 16, wherein the radiopaque particles have a particle size of from 0.2 m to 0.9 m.

18. The block according to claim 9, wherein particles represent at least 2% by weight of total polymer weight.

19. The block according to claim 10, wherein particles represent at least 2% by weight of total polymer weight.

20. The block according to claim 11, wherein particles represent at least 2% by weight of total polymer weight.

21. The block according to claim 12, wherein particles represent at least 2% by weight of total polymer weight.

22. The block according to claim 14, wherein particles represent at least 2% by weight of total polymer weight.

23. The block according to claim 16, wherein particles represent at least 2% by weight of total polymer weight.

24. The block according to claim 9, wherein said polymer is pellet-like.

25. The block according to claim 9, further comprising pigments.

26. The block according to claim 9, wherein dental restauration is crown, bridge, abutment, bar.

Description

EXAMPLES

[0021] The goal of this example is to study the radiopacity of a block made of PEEK including Yb.sub.2O.sub.3

[0022] Material:

[0023] Sample A: PEEK

[0024] Sample B: PEEK 12% Yb.sub.2O.sub.3

[0025] Sample C: PEEK 24% Yb.sub.2O.sub.3

[0026] Method:

[0027] The method corresponds to that disclosed in ISO 4049.

[0028] The sample are square having a length of around 5 mm and a thickness of 10.1 mm

[0029] 5 density measurements are made by sample. Measurements correspond to an equivalency of thickness of aluminium and then is divided by the thickness for obtaining the equivalency of 1 millimeter of material by aluminum millimeter.

[0030] Sample A is not radiopaque. Samples B and C have a percentage aluminium equivalent of 113% and 303% and are both radiopaque.