Influence of modified inorganic particles on the physical and mechanical properties of dental restorative materials

摘要

This study was designed to investigate the effect of different silica modification methods (the water/ethanol system and the cyclohexane system) on physical and mechanical properties of dental restorative materials. After modifying, silanized inorganic particles were characterized using thermogravimetric analysis. The silanized silica particles were mixed with a dimethacrylate resin (70 wt.% filler by mass fraction) subsequently. The physical and mechanical properties of the resin composites were tested by three-point bending strength, elastic modulus, Vicker's microhardness and compression strength. FE-SEM was used to show the fracture morphology of the composites. The experimental data demonstrated that the mechanical properties of the resin composites were the highest when the mass ratio of micro-and nano-silica was 58:12. Furthermore, the physical and mechanical properties of dental resin composites with silica particles modified with the cyclohexane system are superior to the other modification system. The fracture surfaces of the composites exhibited larger fracture sections with the lowest amount of micro-size silica.