Microfilled dental composite and method for making it

Claim 2

A microfilled dental composite containing from about 30% to about 60% filler, said filler being sub-micron hydrophobic silica particles of about 0.01­-0.04 micrometers in diameter, dispersed in ethoxylated bisphenol A dimethacrylate resin containing suitable aliphatic dimethacrylate diluents up to about 40% by weight and curing agents effecting curing.

Claim 3

The composite of claim 1 including means for effecting a one-component light-cured material.

Claim 4

The composite of claim 1 containing a two-component self-cured material.

Claim 5

The composite of claim 1 having a three-part curing system to produce a two-component light-cured material with infinite cure.

Claim 6

The composite of claim 1 in the form of a single, light-cured paste that is applied, and shaped and then cured by exposure to a dental curing visible light.

Claim 7

A microfilled dental composite, comprising: Component Parts by Weight Ethoxylated bisphenol A dimethacrylate 67.75 - 36.00 Triethylene glycol dimethacrylate 11.00 - 16.94 Anti-oxidant (e.g., butyl hydroxy toluene) 0.002 - 0.02 Curing agent 0.05 - 0.20 Cure accelerator 0.05 - 0.20 Sub-micron hydrophobic silica particles 15.00 - 55.00 .

Claim 8

A microfilled dental composite, comprising: Component Parts by Weight Ethoxylated bisphenol A dimethacrylate 67.75 - 36.00 Triethylene glycol dimethacrylate 11.00 - 16.94 Anti-oxidant (e.g., butyl hydroxy toluene) 0.002 - 0.02 Curing agent 0.05 - 0.20 Cure accelerator 0.05 - 0.20 Sub-micron hydrophobic silica particles 15.00 - 55.00 .

Claim 9

The composite of claim 6 wherein the sub-micron hydrophobic silica has a particle range of 0.01 to 0.04 microns, with an average particle size of approximately 0.02 micron (20 x 10⁻⁷ cm) and is based on hydrophobic very pure silicon dioxide aerosol obtained by flame hydrolysis, the particles varying in diameter between 10 and 40 µ having on each 100 sg. meters of surface area about 0.5 millimol silanol groups so that it is hydrophilic and on its surface, one silanol group per 28-33 Ų (- Si - OH) so that with 200 square meters per gram specific surface area, there are about 6.2 x 10²⁰ silanol groups per gram, i.e., one millimol and therefrom about 2000 silanol groups per particle.

Claim 10

The composite of claim 6 wherein the curing agent is 2,3-bornanedione and ethyl-4-dimethyl amino benzoate.

Claim 11

The composite of claim 6 wherein the curing agents and cure accelerators are chosen from the following pairs: 2,3-Bornanedione with ethyl-2-dimethyl amino benzoate Benzil with ethyl-4-dimethyl amino benzoate Benzil with ethyl-2-dimethyl amino benzoate 2-Isopropyl thioxanthone with ethyl-4-dimethyl amino benzoate 2-Isopropyl thioxanthone with ethyl-2-dimethyl amino benzoate Dibenzyl ketone with ethyl-4-dimethyl amino benzoate Dibenzyl ketone with ethyl-2-dimethyl amino benzoate 2-Hydroxy-2-methyl-1-phenyl-propan-1-one with ethyl-2-­dimethyl amino benzoate 2-Hydroxy-2-methyl-1-phenyl-propan-1-one with ethyl-4-­dimethyl amino benzoate Benzil dimethyl acetal with ethyl-4-dimethyl amino benzoate Benzil dimethyl acetal with ethyl-2-dimethyl amino benzoate Dimethoxy acetophenone with ethyl-4-dimethyl amino benzoate Dimethoxy acetophenone with ethyl-2-dimethyl amino benzoate Benzoin methyl ether with ethyl-4-dimethyl amino benzoate Benzoin methyl ether with ethyl-2-dimethyl amino benzoate .

Claim 12

A dental composite consisting essentially of: a light-cured paste as follows: pbw Ethoxylated bisphenol A dimethacrylate 80.00 Triethylene glycol dimethacrylate 20.00 Butylated hydroxytoluene 0.0125 2,3-Bornanedione 0.18 Ethyl-4-dimethyl amino benzoate 0.18 Sub-micron hydrophobic silica 50.00 .

Claim 13

A dental composite consisting essentially of: a light-cured paste as follows: pbw Ethoxylated bisphenol A dimethacrylate 80.00 Triethylene glycol dimethacrylate 20.00 Butylated hydroxytoluene 0.0125 2,3-Bornanedione 0.18 Ethyl-4-dimethyl amino benzoate 0.18 Sub-micron hydrophobic silica 50.00 .