Wear behavior of light-cured dental composite reinforced with silane-treated nanosilica filler

In this study, the effect of varying different weight fraction of silane-treated nanosilica (0-15wt%) on the wear behavior of Bisphenol-A glycidyl methacrylate/tri-ethylene glycol dimethacrylate-based dental composite was analyzed. Fourier transform infrared spectroscopy, transmission electron microscope, and thermo-gravimetric analysis were used to characterize silane-treated filler. The in vitro wear tests were performed up to 20000 cycles using dental wear simulator. Four different working conditions were discussed including 2-body wear in distilled water and artificial saliva as well as 3-body wear in slurry of poppy seed mixed in distilled water and poppy seed mixed in artificial saliva. The results suggested that composites with increased in nanosilica fillers exhibited lower wear volume and smoother worn surface in all working mediums. In 2-body abrasive wear, the wear rate in distilled water was 10.05% more than that in artificial saliva condition. However, in 3-body abrasive wear, the wear rate in slurry of poppy seed mixed in artificial saliva was 15.96% more than that in the medium of poppy seed mixed in distilled water condition. Also, the 2-body abrasive wear rate was 56% and 22% more than the 3-body abrasive wear rate in the slurry of distilled water and artificial saliva condition, respectively.