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With a view to investigate the effects of curing conditions of monomers on the propertiesof visible-light cured veneering resin, triethylene glycol dimethacrylate (TEGDMA) and di (methacryloxyethyl) trimethylhexamethylene diurethane (UDMA) were photo-polymerized andKnoop hardness numbers and amount of eluted monomers were measured. Properties of thepolymers were evaluated with various irradiation times and temperatures.Maximum Knoop hardness number of the photo-polymerized resin was obtaind at an area of0.5 mm depth from the surface with gradual decrease in hardness at the deep area.Curing behavior of TEGDMA was different from that of UDMA.Hardness number of the latter polymer being scarcely influenced with the depth, that of theformer polymer gradually decreased with increase in depth.TEGDMA-UDMA copolymers showed nearly the same characters as UDMA homopolymer.TEGDMA being polymerized uniformly by heating except for surface area, hardness numberat 0.5 mm depth obtained from heating after photo-curing was superior to that obtained from heating.Conversion of TEGDMA, which was not cured uniformly, showed higher value than that of UDMA.Clinically acceptable polymers with excellent properties could be obtained by heating afterextended irradiation.

Polymerization of visible-light cured veneering resin. Part 1. Influence of curing conditions.