Azza Walaaldeen Khairi - Department of Prosthodontics, College of Dentistry, University of Baghdad, Baghdad, Iraq
Ghassan Abdul-Hamid Naji - Department of Prosthodontics, College of Dentistry, University of Baghdad, Bab-Almoadham, P.O. Box ۱۴۱۷, Baghdad, Iraq

Background: Despite the fact that the mechanical properties of PMMA appliances and goods are not ideal, the goal of this research was to reinforce high impact acrylic dentures with rice husk-derived silica in various concentrations to improve some of the mechanical qualities of the denture base.Materials and Method: Based on the pilot study made in College of Dentistry University of Baghdad, to create the specimens, silica particles from a rice husk source were added to high impact heat cure resin at ۱ wt.% and ۳ wt.% (by weight). On the basis of the three tests conducted the transverse strength, impact strength and hardness tests, the prepared samples were evaluated using Fourier-transform infrared spectroscopy (FT-IR), particle size analysis, and a field emission scanning electron microscope (FE-SEM).Results: The results revealed that the addition of silica particles yielded a significantly improvement in transverse strength test (P-value= ۰.۰۰۱), and non-significantly increase in both impact strength and hardness values compared with the control group.Conclusion: Silica particles prepared from natural resource waste was successfully added into the high impact acrylic resin. It seemed that adding ۱ wt.% and ۳ wt.% silica particles. The most beneficial effects were obtained by improving the mechanical properties of high impact acrylic dentures.

High impact acrylic resin, Silica, Nanofiller