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Refractive-index-adjustable Fillers for Visible-light-cured Dental Resin Composites: Preparation of TiO 2-SiO2 Glass Powder by the Sol-gel Process
H. Suzuki
Department of Dental Materials, School of Dentistry, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima-shi 734, Japan
M. Taira
Department of Dental Materials, School of Dentistry, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima-shi 734, Japan
K. Wakasa
Department of Dental Materials, School of Dentistry, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima-shi 734, Japan
M. Yamaki
Department of Dental Materials, School of Dentistry, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima-shi 734, Japan
New fillers have been prepared for visible-light-cured (VL) dental resin composites with the refractive index adjustable to that of the resin phase. These SiO2 glass powders containing TiO2 up to 20 wt% were formed by heating to 1000°C ground gels made from a mixture of Ti[OCH(CH3)2] 4 and Si(OC2H5)4· With increasing TiO2 content, the refractive index of the prepared powder increased linearly, while the optical transmittance at 467 nm decreased linearly. The experimentally formulated VL-cured resin composites, consisting of (TEGDMA and Bis-GMA) monomer mixture and TiO2-SiO2 glass filler, had greater transmittance when the refractive index of the filler matched that of the monomer mixture, resulting in a greater degree of monomer conversion upon irradiation with VL.
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Journal of Dental Research, Vol. 70, No. 5,
883-888 (1991)
DOI: 10.1177/00220345910700050401

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