Journal of Dental Research, Vol 70, 883-888, Copyright © 1991 by International & American Associations for Dental Research Online Journals
Refractive-index-adjustable fillers for visible-light-cured dental resin composites: preparation of TiO2-SiO2 glass powder by the sol-gel process
H. Suzuki, M. Taira, K. Wakasa and M. Yamaki
Department of Dental Materials, School of Dentistry, Hiroshima University, 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 degrees 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 power 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.
