Life cycle estimation of notched polymer base dental composites reinforced with nanoparticles

Nanocomposites are widely used in dental restorative materials and medical equipment, among the most important of which, polymer-based nanocomposites can be mentioned. One of the most useful biocompatible polymers in this field is polymethylmethacrylate (PMMA). In the present study, the numerical analysis of the fatigue behavior of polymethyl methacrylate nanocomposite reinforced with hydroxyapatite nanoparticles has been investigated. For this purpose, standard samples of nanocomposite were made and their mechanical properties were investigated. To study the fatigue behavior and life cycle, a notched model was simulated in Abaqus and Fe-Safe software, and the data obtained from the tensile test were used as the mechanical properties of the material. By adding nanoparticles to the pure polymer, Young's modulus and tensile strength of the part, as well as the life cycle, were improved; However, it was observed that with the addition of more nanoparticles, the mechanical properties and the life cycle decreased slightly, which was caused by the accumulation of nanoparticles on the surface of the nanocomposite, which leads to a decrease in the strength of the samples.