Shore hardness behavior of light-cured dental composite resin filled with TiO2 nanoparticlesShore-Harte von lichtgehartetem, mit TiO2-Nanopartikeln gefulltem Zahnkompositharz

In this study, the influence of light curing times, curing modes and concentrations of titanium dioxide nanoparticles on the Shore hardness number of top and bottom surfaces and hardness ratio of hybrid composite resin is investigated. Hybrid composite resin and titanium dioxide nanoparticles are the materials used in this study. Titanium dioxide nanoparticles are added to hybrid composite resin. The resulting paste is placed in plastic bars and cured using a visible light curing unit for 60 s, 80 s, 100 s and 120 s from both sides. The curing modes used are gradually strong, flashing and strong modes. Hardness number of top and bottom surfaces is measured using Shore D durometer test. The results show that the curing times, curing modes and concentrations of titanium dioxide nanoparticles have influence on the Shore hardness numbers. The Shore hardness numbers at 120 s is higher than that obtained for a 60 s cure time and flashing curing mode produce dental nanocomposite resin with higher Shore hardness numbers. The Shore hardness numbers of the studied hybrid composite is increased by adding 0.5 wt.% and 0.6 wt.% of titanium dioxide nanoparticles.