Prepolymerized filler in dental restorative composite
First Claim
1. A dental composite, comprising:
- a polymerizable resin base; and
about 10% by volume to about 80% by volume filler consisting essentially of a structural filler, a prepolymerized filler, and a nanofiller, wherein the structural filler comprises between about 10% by volume and about 70% by volume of the composite and consists of ground particles of mean particle size between about 0.05 μ
m and about 0.50 μ
m, and wherein the ground structural filler contains less than 50% by volume of particles above 0.5 μ
m in diameter, wherein the prepolymerized filler comprises at least about 1% by volume of the composite and consists of an inorganic portion and a polymerized organic resin portion, and wherein the nanofiller comprises at least about 0.01% by volume of the composite and consists essentially of discrete, non-aggregated particles of mean particle size less than about 100 nm.
3 Assignments
0 Petitions
Accused Products
Abstract
A dental composite having high filler loading and low shrinkage thereby providing good strength and marginal integrity. Through the use of prepolymerized filler particles in combination with a structural filler and a nanofiller, the composite exhibits very low shrinkage and is useful in stress bearing restorations and in cosmetic restorations. The structural filler used is ground to a mean particle size of less than 0.5 μm and the nanofiller has discrete particles of a mean particle size less than 100 nm to improve handling and mechanical characteristics. The prepolymerized filler particles also allow for less viscosity and better handling characteristics of the composite.
74 Citations
49 Claims
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1. A dental composite, comprising:
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a polymerizable resin base; and
about 10% by volume to about 80% by volume filler consisting essentially of a structural filler, a prepolymerized filler, and a nanofiller, wherein the structural filler comprises between about 10% by volume and about 70% by volume of the composite and consists of ground particles of mean particle size between about 0.05 μ
m and about 0.50 μ
m, and wherein the ground structural filler contains less than 50% by volume of particles above 0.5 μ
m in diameter,wherein the prepolymerized filler comprises at least about 1% by volume of the composite and consists of an inorganic portion and a polymerized organic resin portion, and wherein the nanofiller comprises at least about 0.01% by volume of the composite and consists essentially of discrete, non-aggregated particles of mean particle size less than about 100 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A dental composite comprising:
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a polymerizable resin base; and
about 22% by volume to about 80% by volume filler in the resin base, the filler consisting essentially of a ground structural filler, a prepolymerized filler, and a nanofiller;
wherein the ground structural filler comprises between about 20% by volume and about 70% by volume of the composite and consists of ground particles having a mean particle size of between about 0.05 μ
m and about 0.50 μ
m,wherein the prepolymerized filler comprises from about 1% to about 60% by volume of the composite and consists essentially of ground polymerized particles having an inorganic portion and a polymerized organic resin portion and a particle size distribution having at least a first average particle size peak centered in the range of about 30 μ
m to about 70 μ
m,wherein the nanofiller comprises between about 1% by volume and about 15% by volume of the composite and consists essentially of discrete, non-aggregated particles having a mean particle size of less than about 100 nm; and
wherein volumetric shrinkage of the composite during polymerization thereof is about 2% or less, as measured by the water buoyancy method. - View Dependent Claims (16, 17, 18)
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19. A dental composite, comprising:
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a polymerizable resin base; and
about 35% by volume to about 80% by volume filler consisting essentially of a ground structural filler, a prepolymerized filler, and a nanofiller;
wherein the ground structural filler comprises between about 20% by volume and about 60% by volume of the composite and consists of ground particles of mean particle size between about 0.05 μ
m and about 0.50 μ
m, and wherein the ground structural filler contains less than 50% by volume of particles above 0.5 μ
m in diameter,wherein the prepolymerized filler comprises between about 10% and about 40% by volume of the composite and consists essentially of ground polymerized particles having an inorganic portion and a polymerized organic resin portion and having a mean particle size in the range of from about 30 μ
m to about 70 μ
m, and wherein the prepolymerized filler contains at least about 90% of the particles of size less than about 100 μ
m, and at least about 85% of the particles of a size greater than about 10 μ
m, andwherein the nanofiller comprises between about 5% by volume to about 12% by volume of the composite and consists essentially of discrete, non-aggregated particles of mean particle size less than about 50 nm. - View Dependent Claims (20, 21)
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22. A method of making a dental composite paste for use in restoring a tooth, the method comprising:
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preparing a prepolymerized filler by mixing an inorganic filler with an organic polymerizable resin, curing the mixture, and then grinding the cured mixture;
providing a structural filler consisting of ground particles of mean particle size between about 0.05 μ
m and about 0.50 μ
m, and wherein the ground structural filler contains less than 50% by volume of particles above 0.5 μ
m in diameter;
providing a discrete nanofiller consisting essentially of discrete, non-aggregated particles of mean particle size less than about 100 nm;
mixing the structural filler, prepolymerized filler and discrete nanofiller with a polymerizable resin base to form a dental composite paste having a total filler loading between about 10% by volume and about 80% by volume, wherein the structural filler comprises between about 10% by volume and about 70% by volume of the composite paste, the prepolymerized filler comprises at least about 1% by volume of the composite paste, and the discrete nanofiller comprises at least about 0.01% by volume of the composite paste; and
wherein, upon curing, the dental composite paste is adapted to exhibit about 2% or less volumetric shrinkage, as measured by the water buoyancy method. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method of restoring a tooth, the method comprising:
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mixing a structural filler, a prepolymerized filler and a discrete nanofiller with a polymerizable resin base to form a dental composite paste having between about 10% by volume and about 80% by volume total filler loading, wherein the structural filler comprises between about 10% by volume and about 70% by volume of the composite paste, and consists of ground particles of mean particle size between about 0.05 μ
m and about 0.50 μ
m, and wherein the ground structural filler contains less than 50% by volume of particles above 0.5 μ
m in diameter, andwherein the prepolymerized filler comprises at least about 1% by volume of the composite paste, and consists essentially of an inorganic portion and a polymerized organic resin portion, and wherein the nanofiller comprises at least about 0.01% by volume of the composite paste, and consists essentially of discrete, non-aggregated particles of mean particle size less than about 100 μ
m;
applying the dental composite paste to the tooth to be restored; and
curing the dental composite paste, wherein the volumetric shrinkage of the cured dental composite is about 2% or less, as measured by the water buoyancy method. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification