Influence of adding nano / micro hydroxyapatite (HA) particles on tribological characteristics of polymethyl methacrylate (PMMA)

Abstract

The aim of our work was to evaluate the influence of reinforcement of the denture base resin PMMA, using biocompatible hydroxyapatite HA material, where two particles sizes (micro and nanoparticles) were used and different weight fractions (1,2,3,4 and 5)for the 50 nm HA, (5, 10, 15, 20 and 25) for the 80µm HA. As percentages of a composite. The values of hardness, shock resistance, wear rate, and thermal conductivity were measured in the first part of the research. The results showed that the best combination of properties appeared at the two concentrations 4% in nanoparticles and at 10% of micro-particles. In the second part of this paper, TMA and DSC tests were performed on the previous two best results composites, in addition to a pure resin sample to evaluate the thermal properties such as the linear expansion coefficient and the glass transition temperature.