Author(s): Omid Louie*, Zinat Gordi, Azam Louie
Poly methyl methacrylate (PMMA) is the most common material used in Prosthetic dentures [1-2]. Various attempts have been made to avoid breaking prosthesis are like changing the chemical structur e of the resin with the addition of cross linking agents or copolymerization [3-5]. The innovative method for improving the physical properties of the prosthesis and increase strength, a copolymer of styrene - methyl methacrylate (St-Co-MMA) was proposed. The St-Co-MMA by weight percentages (20-80, 40-60, 50-50, 60-40 & 80-20) were synthesized. Increasing styrene wv% in copolymer this causes that the tensile strength increased until it reached a certain value, at the maximum tensile strength. The tensile strength decreased while more than styrene copolymer. St-Co-MMA characterized by FTIR, NMR spectroscopic methods. TGA, decomposition temperature (TD) and tensile strength were measured according to ISO 1567 standard. In this project its showed the highest tensile strength of the synthetic styrene - methyl methacrylate copolymer was (20-80)wv%.