Patent ID: 7939575

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, (ii) about 0.005 to about 0.5% by weight of 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) 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 and about 1 to about 30% by weight of nanofiller; and b) irradiating the composition with light having a having a wavelength of greater than 420 nm to activate photopolymerization system (a) so that the composition partially-cures; and c) irradiating the composition with light having a 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-benzyl-2-(dimethylamino)-4′-morpholinobutyrophenone.