可視光線重合型コンポジットレジンの硬化深さにおよぼすフィラー粒子径の影響

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To determine the effect of filler particle size on the cure depth of visible light-cured composite resins, experimental composite resins based on urethane dimethacrylate monomers were prepared and the cure depth, light transmission coefficient, and refractive indices of their monomer and filler component were measured. The different types of silica fillers were employed : microfiller (average particle size : 0.04μm), three sphere-shaped (0.3,0.5 and 1.0μm) and six splinter-shaped fillers (1.6,3.9,5.7,10.8,18.8 and 26.2μm). Experimental composite resins were prepared by blending these fillers to the mixture of urethane dimethacrylate (50wt%) and trithylenglycol dimethacrylate (50wt%). Volume fraction of the fillers were 5-25 vol% for microfiler, and 40-60 vol% for sphere and splinter-shaped fillers. Urethane dimethacrylate monomers employed were dimethacryloyloxyethyl-2,2', 4-trimethylhexane-dicarbamate (UEDMA) and di (2-methyl-3-methacryloyloxyethyl) -xylylene-dicarbamate (XY-HPMA). The refractive indices of the uncured and cured resin monomers and fillers, and the cure depth of the composite resins were measured. The light transmission coefficient was determined by means of a radiometer for uncured and cured composite resins. The refractive index of resin monomers was increased by curing. XY-HPMA-based resin monomer showed a higher refractive index than the UEDMA-based resin monomer in both uncured and cured nature. The cure depth of composite resins increased with extended exposure time. The cure depth was affected by filler particle size. In micro and sphere-shaped fillers, the composite resin filled with 0.3μm filler showed the lowest cure depth. With splinter-shaped fillers, the cure depth increased with increasing filler size. The light transmission coefficient was dependent upon the filler particle size and the content. This dependency was similar to that for the cure depth. The light transmission coefficient of the composite resins increased by curing when filled with splinter-shaped fillers, but decreased with micro and sphere-shaped fillers. At a filler particle size of approximately a half order of the wavelength of visible light, the cure depth and light transmission coefficient became minimal. The smaller the difference of refractive index between filler and resin matrix, the greater the cure depth and light transmission coefficient of the composite resin.
1992-03-31

可視光線重合型コンポジットレジンの硬化深さにおよぼすフィラー粒子径の影響

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