STUDYING THE EFFECT OF NATURAL BAMBOO AND RICE HUSK POWDERS ON COMPRESSIVE STRENGTH and HARDNESS OF ACRYLIC RESIN

Abstract

Denture base is the part of a denture that rests on the foundation tissues and to which teeth are Attached. Denture base may be complete or partial used for the alteration of missing natural teeth. The most popular material utilized for the fabrication of dentures base is the poly (methyl methacrylate) (PMMA) because is distinguished by many characteristic. The remarkable clarity of a methyl methacrylate resin, its relatively high strength and hardness, its color stability under all conditions of dental use, its insolubility in the mouth fluids, all of these properties combine to provide an excellent material for the prosthetics denture (S. S Carmen, 2010 and R. K. Alla 2013). This survey illustrate the effect of particle size of powders and weight fraction of natural Bamboo and Rice Husk powders on PMMA, with the selected size particles of (25µm and 75µm) and weight fraction (2, 4, 6 and 8wt. %), on compression strength and hardness, and these experience were accomplished at a temperature of laboratory. The results showed improved in the hardness and compression with concentration rate of Rice Husk and Bamboo powders in composite samples. Also, the highest values of compressive strength and hardness were (300MPa.) and (86) respectively for (PMMA-8%RH) and particle size (25 µm).