Objective: This study was aimed to evaluate the effect of incorporation of two-different nanoparticles (NPs); silica (SiO 2 ), and zirconia (ZrO 2 ) on flexural strength, impact strength, as well as, water sorption and solubility of thermoplastic resin material. Materials and Methods:Two nanoparticles SiO 2 -NPs, and ZrO 2 -NPs (Nano-gate Company, Egypt) were incorporated into thermoplastic resin ...