Filler on the basis of particulate composite
Particulate composite material with an average particle size of 20 to 50 μm and a maximum content of particles with a size of <10 μm of 10 wt.-% and its use for the preparation of dental materials.
1. A composition comprising:
(i) 10 to 80 wt.-% organic binder;
(ii) 0.01 to 5 wt.-% polymerization initiator;
(iii) 20 to 90 wt.-% particulate composite filler, comprising a polymerized mixture of organic binder and inorganic filler, the composite filler particles having an average particle size of 20 to 50 μm, each wt-% of (i), (ii), and (iii) relative to the total mass of the composition; and
wherein the composition contains at most 10 wt.-% composite filler particles having a size of <10 μm, relative to the total mass of the particulate composite filler in the composition.
2. Composition according to claim 1 , wherein the composite filler has a maximum particle size of 70 μm.
3. Composition according to claim 1 , wherein the composite filler is prepared by curing of a mixture of
(a) 10 to 80 wt.-% organic binder;
(b) 0.01 to 5 wt.-% polymerization initiator; and
(c) 20 to 90 wt.-% inorganic filler, each relative to the total mass of the uncured mixture.
4. Composition according to claim 3 , wherein the inorganic filler comprises quartz, glass ceramic, glass powder or a mixture thereof.
5. Composition according to claim 4 , wherein said glass powder comprises barium glass powder or strontium glass powder.
6. Composition according to claim 4 , wherein said quartz, glass ceramic and/or glass powder has an average particle size of 0.4 to 1.5 μm.
7. Composition according to claim 3 , wherein said composite filler contains 10 to 50 wt.-% X-ray-opaque filler.
8. Composition according to claim 7 , the composite filler further comprising ytterbium fluoride.
9. Composition according to claim 3 , the composite filler further comprising precipitated mixed oxides.
10. Composition according to claim 1 , further comprising an inorganic filler which is not a component of the composite filler.
11. Composition according to claim 10 , wherein said inorganic filler comprises quartz, glass ceramic, glass powder, or a mixture thereof.
12. Composition according to claim 11 , wherein said glass powder comprises barium glass powder and/or strontium glass powder.
13. Composition according to claim 11 , wherein said quartz, glass ceramic and/or glass powder has an average particle size of 0.4 to 2 μm.
14. Composition according to claim 10 , comprising 25 to 70 wt.-% quartz, glass ceramic and/or glass powder.
15. Composition according to claim 10 , further comprising an X-ray-opaque filler which is not a component of the composite filler.
16. Composition according to claim 15 , comprising ytterbium fluoride.
17. Composition according to claim 15 , comprising 1 to 10 wt.-% X-ray-opaque filler.
18. Composition according to claim 10 , further comprising a layered silicate.
19. Composition according to claim 18 , comprising 0.05 to 5 wt.-% layered silicate.
20. Composition according to claim 1 , further comprising precipitated mixed oxide which is not a component of the composite filler.
21. Composition according to claim 20 , comprising SiO 2 /ZrO 2 mixed oxide.
22. Composition according to claim 20 , wherein said mixed oxide has a particle size of 200 to 300 nm.
23. Composition according to claim 20 , comprising 20 to 70 wt.-% mixed oxide.
24. Composition according to claim 1 , further comprising 0.01 to 2 wt.-% additives which are not a component of the composite filler.
25. The composition according to claim 1 , comprising a tooth-filling material, material for inlays or onlays, tooth cement, facing material for crowns and bridges, or material for false teeth.
26. Composition according to claim 3 , wherein the organic binder is 10 to 30 wt.-%, the polymerization initiator is 0.5 to 2 wt.-%, and the inorganic filler is 60 to 88 wt.-%.
27. Composition according to claim 6 , wherein said average particle size is 0.7 to 1.0 μm.
28. Composition according to claim 7 , wherein said composite contains 20 to 30 wt.-% X-ray-opaque filler.
29. Composition according to claim 14 , comprising 30 to 50 wt.-% quartz, glass ceramic andlor glass powder.
30. Composition according to claim 3 , wherein the organic binder comprises 10 to 30 wt.-%, relative to the total mass of the uncured mixture.
31. Composition according to claim 3 , wherein the polymerization initiator comprises 0.5 to 2 wt.-%, relative to the total mass of the uncured mixture.
32. Composition according to claim 3 , wherein the inorganic filler comprises 60 to 88 wt.-%, relative to the total mass of the uncured mixture.