Evaluation of some properties of recycled polymethylmethacrylate incorporated to the acrylic resin

Abstract

Many attempts have been made enhancing properties of PMMA denture base material. Adding fillers to PMMA was a commonly used  method to improve physical and mechanical properties. To estimate the effects of incorporating recycled polymethylmethacrylate with  a different percentage with conventional heat-cured acrylic resin on some properties of heat-cured denture base resin. The recycled  polymethylmethacrylate (Chaini-HK G) particles dissolved at (5%,10%,15%) was added to heat-cured polymethylmethacrylate (Spofadental, Czech Republic) polymer and mixed with a ratio of 2:1 with the polymethylmethacrylate monomer. A total number of  specimens were 80, which divided into three experimental groups (5%, 10%, 15%) and control group. Each group have 20specimens.  The surface hardness, water sorption, solubility and residual monomer of test groups measured as well as compared to that of control  groups. Fourier transform infrared spectroscopy test (FTIR) was done for three experimental and control group. This study shows a  statistically significant difference at (p<0.01) in the hardness of recycled polymethylmethacrylate incorporate material (10 %,15%)  groups when compared with a control group; while recycled polymethylmethacrylate incorporated (5%) group show no significant  difference, group with 15% shows the highest Vickers hardness value. The mean values of water sorption test solubility test and  residual monomer were decreased with the increase of incorporating a percentage of recycled polymethylmethacrylate as compared  to the mean value of the control group. The incorporation of recycled polymethylmethacrylate to heat acrylic resin at different  percentage improves some of its properties.