Assessment The Mechanical and Color Changes Properties of Denture Base Material After Reinforcement with Nanoparticles Material

Abstract

Although PMMA is widely used in prosthetic dentistry, but broken dentures are commonly known clinical events that remain as unsolved problems. The aim of this study was to evaluate the effect of incorporation Magnesium oxides nanoparticles with different concentrations on hardness and color changes o f heat cure acrylic resin. A total of 40-disc shape specimens with a diameter of (12±0.1) mm and a thickness of (2±0.1) mm were prepared from heat cure acrylic resin. They were grouped into 4 groups according to nanoparticles concentrations (10) specimens for each group, then they are subjected to hardness and color changes tests. Control group (A): (10 specimens) without addition. Group (B): 10 specimens of acrylic resin with (2%) concentration of MgO. Group (C): 10 specimens of acrylic resin with (4%) concentration of MgO. Group (D): 10 specimens of acrylic resin with (6%) concentration of MgO. The results showed there is high significant difference for MgO (2%, 4%) when compared with the controls. While there is no significant variation for MgO (6%). color changes showed there is a non-significant difference for all groups except for (6%) group which revealed there is high significant difference. Adding limited concentration of MgO (2%, 4%) have a positive effect on hardness of surfaces and color changes of heat-cured acrylic resins. any Increase in Concentration of MgO will effect adversely on hardness of surfaces and color stabiliti