초록 ▼

A dental restorative composition is provided that includes a polymerizable resin, a substantially translucent structural filler, a nanofiller having a mean particle size less than 100 nm, and at least one rheology-modifying additive. In one embodiment, the structural filler has a refractive index su

A dental restorative composition is provided that includes a polymerizable resin, a substantially translucent structural filler, a nanofiller having a mean particle size less than 100 nm, and at least one rheology-modifying additive. In one embodiment, the structural filler has a refractive index substantially similar to that of the polymerizable resin, a coarse particle fraction, and a fine particle fraction having a mean particle size greater than 0.1 μm and smaller than the mean particle size of the coarse particle fraction. The relative ratio of the coarse particle fraction to the fine particle fraction is in the range from about 12:1 to about 2:1 by volume, the particle size distribution of each fraction is essentially monomodal, and the D(90) of the fine particle fraction is less than or equal to the D(10) of the coarse particle fraction.

대표청구항 ▼

1. A dental restorative composition, comprising: a polymerizable resin;a substantially translucent structural filler having a refractive index substantially similar to that of the polymerizable resin, wherein the structural filler comprises: a coarse particle fraction having a first mean particle si

1. A dental restorative composition, comprising: a polymerizable resin;a substantially translucent structural filler having a refractive index substantially similar to that of the polymerizable resin, wherein the structural filler comprises: a coarse particle fraction having a first mean particle size greater than 3 μm, andan inorganic fine particle fraction having a second mean particle size greater than 0.1 μm and less than 1 μm,wherein a relative ratio of the coarse particle fraction to the fine particle fraction is in the range from about 12:1 to about 2:1 by volume, the particle size distributions of each of the coarse and fine particle fractions are essentially monomodal;a nanofiller having a mean particle size less than 100 nm; andat least one rheology-modifying additive,wherein the composition has a viscosity that is paste-like in an undisturbed state, and the composition undergoes shear-thinning to reduce the viscosity to liquid-like in a disturbed state in which the composition is subjected to sonic and/or ultrasonic vibration. 2. The composition of claim 1, wherein the at least one rheology-modifying additive comprises an inorganic rheology modifier. 3. The composition of claim 2, wherein the at least one rheology-modifying additive is fumed silica. 4. The composition of claim 2, wherein the at least one rheology-modifying additive further comprises an organic rheology modifier. 5. The composition of claim 4, wherein the organic rheology modifier is an alkylamide of the general formula RCONHR′, where R is an alkyl or alkylidine group and R′ is an alkyl group. 6. The composition of claim 1, further comprising a polymerizable phosphate polyester dispersant. 7. The composition of claim 1, wherein the at least one rheology-modifying additive is present in an amount of about 0.1 to about 5 wt. %. 8. The composition of claim 1, wherein the nanofiller is essentially non-agglomerated colloidal silica. 9. The composition of claim 1, wherein the coarse particle fraction has a D(10)≧1 μm, and the fine particle fraction has a D(90)≦0.9 μm. 10. The composition of claim 9, wherein, for the coarse particle fraction, the first mean particle size is in the range of about 4-7 μm and the D(10) is ≧1.2 μm, and for the fine particle fraction, the second mean particle size is in the range of about 0.3-0.7 μm. 11. The composition of claim 1, wherein the refractive index of the structural filler minus the refractive index of the polymerizable resin is less than or equal to about 0.05. 12. The composition of claim 1, wherein the ratio of the structural filler to the nanofiller is in the range of about 20:1 to about 10:1 by volume. 13. The composition of claim 1, wherein, upon curing, the composition exhibits less than about 1.8% volumetric shrinkage. 14. The composition of claim 1, wherein the Loss Tangent is 1 in the disturbed state.