MATERIAL FOR BUILDING UP STUMPS
The invention relates to a polymerizable material for the production of a dental material for building up stumps, having the following characteristics: —the material comprises at least one polymerizable monomer, oligomer, and/or pre-polymer, —the total filler content of the material is 50 to 85% by weight, —the material comprises 5 to 25% by weight nano-filler, having a mean particle size d5o of 300 nm or less, wherein at least 50% by weight of said nano-filler has a particle size of 200 nm or less, —the material comprises 35 to 75% by weight micro-filler, having a mean particle size d 50 of 0.3 to 10 μm, —the ability to grind the cured material for building up stumps deviates from the ability to grind human dentin by 15% at the most. The invention further relates to a kit comprising at least two components for the production of such a polymerizable material.
1 . A polymerizable material for producing a dental core buildup material, with the following features:
the material contains at least one polymerizable monomer, oligomer and/or prepolymer,
the total filler content of the material is 50 to 85% by weight,
the material contains 5 to 25% by weight of nanofiller with a mean particle size d 50 of 300 nm or less, at least 50% by weight of this nanofiller having a particle size of 200 nm or less,
the material contains 35 to 75% by weight of microfiller with a mean particle size d 50 of 0.3 to 10 μm,
the grindability of the cured core buildup material differs by at most 15% from the grindability of human dentin.
2 . The material as claimed in claim 1 , wherein the polymerizable monomers, oligomers and/or prepolymers are selected from the group consisting of free-radically and cationically polymerizable monomers, oligomers and/or prepolymers.
3 . The material as claimed in claim 2 , wherein the polymerizable monomers comprise acrylates and/or methacrylates.
4 . The material as claimed in claim 1 , wherein the total filler content is at least 55% by weight and at most 80% by weight.
5 . (canceled)
6 . The material as claimed in claim 1 , wherein the nanofiller content is at least 6% by weight and at most 20% by weight.
7 . (canceled)
8 . The material as claimed in claim 1 , wherein at least 50% by weight of the nanofiller has a particle size of 150 nm or less.
9 . The material as claimed in claim 1 , wherein the mean primary particle size of the nanofiller is between 1 and 80 nm.
10 . The material as claimed in claim 1 , wherein the microfiller content is at least 40% by weight and at most 70% by weight.
11 . (canceled)
12 . The material as claimed in claim 1 , wherein the mean particle size d 50 of the microfiller is at least 0.4 μm and at most 7.0 μm.
13 . (canceled)
14 . The material as claimed in claim 1 , wherein the nanofiller and/or the microfiller is at least partly surface-modified and has, on its surface, functional groups which can react chemically with the organic matrix of the material or have a high affinity for this matrix.
15 . A kit for producing a polymerizable material as claimed in claim 1 , wherein the kit comprises at least two components from which the polymerizable material can be made up.
16 . The kit as claimed in claim 15 , wherein the nanofiller is present only in one component.
17 . The kit as claimed in claim 15 , the dynamic viscosity of each component at a shear stress of 1500 Pa is between 5 and 250 Pas.
18 . The kit as claimed in claim 17 , the dynamic viscosity of each component at a shear stress of 1500 Pa is at least 8 Pas and at most 225 Pas.
19 . (canceled)
20 . A dental core buildup material obtainable by allowing a polymerizable material as claimed in claim 1 to cure.
21 . The use of a polymerizable material as claimed in claim 1 for producing a dental core buildup material.
22 . The material as claimed in claim 1 , wherein the total filler content is at least-58% and at most 75% by weight.
23 . The material as claimed in claim 1 , wherein the total filler content is at least 60% and at most 72% by weight.
24 . The material as claimed in claim 1 , wherein the nanofiller content is at least 6% and at most 18% by weight.
25 . The material as claimed in claim 1 , wherein at least 50% by weight of the nanofiller has a particle size of 100 nm or less.
26 . The material as claimed in claim 1 , wherein the mean primary particle size of the nanofiller is between 4 and 60 nm.
27 . The material as claimed in claim 1 , wherein the mean primary particle size of the nanofiller is between 6 and 50 nm.
28 . The material as claimed in claim 1 , wherein the microfiller content is at least 45% and at most 65% by weight.
29 . The material as claimed in claim 1 , wherein the microfiller content is at least 45% and at most 60% by weight.
30 . The material as claimed in claim 1 , wherein the mean particle size d 50 of the microfiller is at least 0.5 μm and at most 5.0 μm.
31 . The material as claimed in claim 1 , wherein the mean particle size d 50 of the microfiller is at least 0.7 μm at most 4.0 μm.
32 . The material as claimed in claim 1 , wherein the mean particle size d 50 of the microfiller is at least 1.0 μm at most 3.0 μm.
33 . The kit as claimed in claim 17 , wherein the dynamic viscosity of each component at a shear stress of 1500 Pa is at least 10 Pas and at most 200 Pas.
34 . The kit as claimed in claim 17 , wherein the dynamic viscosity of each component at a shear stress of 1500 Pa is at least 10 Pas and at most 175 Pas.