Abstract
Nanocomposite dental resins with 0, 2, 5, and 10 wt % methacryl polyhedral oligomeric silsesquioxane (POSS) as filler in the resin matrix were prepared by a light curing method.The atomic force microscopy (AFM), fourier transform infrared spectroscopy (FTIR), nanoindentation, and nanoscratch tests were carried out to study the effect of POSS contents on the compatibility, double bond conversion, volumetric shrinkage, hardness, modulus, and resistance of the dental resins. POSS was very uniformly dispersed and showed a good compatibility with the matrix. The double bond conversion increased and the volume reduced with the addition of POSS. As the POSS addition increased, the mechanical properties increased initially. Small addition of POSS remarkably enhanced the hardness and scratch resistance of the resin matrix.
Highlights
Conventional alloys in the current dental field have been replaced by resin materials due to their advantages such as operation technique and aesthetic quality [1,2]
His work indicated that Bisphenol A glycerolate dimethacrylate (Bis-GMA) with polyhedral oligomeric silsesquioxane (POSS)-MA did not affect the volumetric shrinkage, and the mechanical property of the composite was optimized only with a small percentage of POSS-MA substitution
The values of the shrinkage of POSS composites resin with a large percentage of additional BG powder were lower than the results reported in this work
Summary
Conventional alloys in the current dental field have been replaced by resin materials due to their advantages such as operation technique and aesthetic quality [1,2]. Hybrid organic-inorganic nanocomposites, which incorporate polyhedral oligomeric silsesquioxane (POSS) into polymeric matrices including dental resins, have received a considerable amount of attention. His work indicated that Bis-GMA with POSS-MA did not affect the volumetric shrinkage, and the mechanical property of the composite was optimized only with a small percentage of POSS-MA substitution. To the best of our knowledge, there are not any reports about dental resin incorporated with the relatively low addition of POSS It seems that a low addition of POSS as nanofiller enhances the performances of matrix [34,35]. Dental resin composites with various amounts of POSS were processed using the light curing method. The atomic force microscopy (AFM), FTIR, nanoindentation, and nanoscratch tests were performed, and the effects of the contents of POSS on the compatibility, double bond conversion, volumetric shrinkage, hardness, and resistance were studied
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