Patent ID: 8420708

Claim:
A method of making a dental restoration, comprising the steps of: a) providing a two-phase light-curing composition, the composition comprising: (i) about 10 to about 60% by weight of polymerizable compound based on the composition, (ii) about 0.005 to about 0.5% by weight of photopolymerization system (a) based on the polymerizable compound, the photopolymerization system (a) containing a photoinitiator having a light absorbency maximum wavelength of greater than 420 nm, (iii) about 0.05 to about 0.5% by weight of photopolymerization system (b) based on the polymerizable compound, the photopolymerization system (b) containing a photoinitiator having a light absorbency maximum wavelength of less than 420 nm, (iv) about 30 to about 90% by weight of structural filler based on the composition, the structural filler has an average particle size in the range of about 0.35 to about 0.95 μm; and (v) about 1 to about 30% by weight of nanofiller based on the weight of the composition, the nanofiller has an average particle size in the range of about 0.02 to about 0.04 μm; b) dispensing the two-phase light-curing composition into a substantially transparent plastic matrix; c) placing the plastic matrix in a mouth of a patient so that the composition is molded over the tooth surface; d) irradiating the composition with light having a wavelength of greater than 420 nm to activate photopolymerization system (a) so that the composition partially-cures to form a restoration; e) removing the hardened restoration from the surface of the tooth; and f) irradiating the composition with light having a wavelength of less than 420 nm to activate photopolymerization system (b) so that the composition fully cures; and wherein photopolymerization system (a) comprises camphorquinone, ethyl 4-(dimethylamino)benzoate and butylated hydroxytoluene; and photopolymerization system (b) comprises 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide.