Experimental Analysis of Effect of Hydroxyapatite Nanoparticles on Wear Properties and Micro Hardness of Dental Composites

Wear is a very natural and inevitable phenomenon .considering human teeth, wear of human teeth is the concern. Natural ageing, chemicals in food, chewing and biting action causes wear over the whole life span of human. While selecting the restorative material, wear resistance and microhardness are the two basic propertites which are to be prioritized amongst other mechanical properties of dental restorative materials. In this study two different restorative materials are taken under study. The influence of incorporation of Hydroxyapatite nano particles into dental composite has been studied here. the wear loss and microhardness of dental composites are investigated at different percentages of hydroxyapatite using a reciprocating tribometer and digital microhardness tester respectively. Frictional force, coefficient of friction is taken into account for comparison. The results show that as percentage of Hydroxyapatite increases, wear resistance and microhardness also increases. From the results it can be concluded that hydroxyapatite contributes to the hardness and wear resistance of dental composite.