The aim of this study was to evaluate the mechanical properties of conventional composite resins (Solare P) and the modified composite resin having mixed with zirconium nanoparticles. The composite resins are used to replace the missing tooth structure and improve esthetics. In this study the composite was filled with increments in a mould which was 4 mm in depth and 3 mm in diameter. After filling it was polymerized with halogen light curing unit for 20 seconds for each increment. In other experiments the composite was mixed with zirconium nanoparticles and filled in the moulds with increments and polymerized for 20 seconds with halogen light curing unit for each increment. After keeping the moulds at 37oC for 24 hours their mechanical properties including force, %age elongation, compressive strength and hardness were evaluated. It was seen that by adding zirconium nanoparticles force, %age elongation, compressive strength and hardness increased significantly. Thus it was concluded...

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