الفهرس 
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Abstract
The purpose of this study was to evaluate the in vitro three-body wear resistance of the recently introduced nanohybrid resin composites with novel resin matrices; Ormocer (Organically Modified Ceramics) versus POSS (Polyhedral Oligomeric Silsesquioxane) when a nanohybrid resin composite with the conventional methacrylate-based resin matrix was the control. When all of these composites will be exposed to wear cycles equivalent to three and six months aging periods.