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 (25?m and 75?m) 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 ?m).