Abstract:

Objective To discuss the influence of nano-silica content which was hydrolyzed by tetraethyl orthosioate（TEOS） on the aluminum borate whisker（AlBw） and silica filler composite resins on flexural properties. Methods The nanometer-size silicon dioxide（SiO2） particles were prepared by sol-gel method based on tetraethyl orthosioate. Different proportion of AlBw and SiO2 were fused and attached onto the surface of AlBw through high temperature, then polymerized with resin matrix after surface siliconization and their flexural strength and flexural modulus were determined. The effects of heat treatment to the surface morphology of AlBw and the shapes of the mixture at various proportions were characterized by TEM. Results The flexural properties of dental composite resins with AlBw-SiO2 compound as inorganic fillers were significantly improved. The flexural property of a new type of dental composite resins was（130.29±8.38）MPa, when the mass ratio of AlBw and nano-SiO2 particle was 3∶1. Conclusion Nano-silica content which was hydrolyzed by tetraethyl orthosioate improved flexural properties of the aluminum borate whisker and silica filler composite resins.

Key words: nano-silica, whiskers, composite resins, flexural property