Abstract
Four modes of accelerated aging tests were carried out on experimental BisGMA-based composite resins (Vf=55%: splinter-shaped or spherical silica) to investigate the relationships between the degradation of matrix resin and resin/filler interface and the mechanical properties. Degradation of resin/filler interface was evaluated on composite resins thermo-cycled (0-105 cycles) and immersed in distilled water (37℃ and 60℃) for up to 180 days. Matrix resin degradation was evaluated in composite resins immersed in 75% ethanol at 37℃ for up to 180 days. The results of this study revealed that degradation of resin/filler interface and matrix resin affected the mechanical properties considerably. Degradation was accelerated by the number of thermo-cycles and the immersion periods in various conditions. The results indicated that the degradation of the resin/filler inteface and the matrix resin significantly affected the clinical durability of composite dental resins.
