Denture base polymers, poly methyl methacrylate improved using free radical copolymerization

Poly methyl methacrylate (PMMA) is the most common material used in Prosthodontics. Several studies indicate a breakdown of the number of very high resin bases after 2 to 3 years to avoid breaking bass, and several attempts have been made such as altering the chemical structure of resin by adding causes cross linking or copolymerization. As an innovative method for improving the physical properties of the prosthesis and increasing its strength, a copolymer of styrene-methyl methacrylate was proposed. Tensile strength was increased with the increase of styrene with methyl methacrylate in an amount determined to be the most resistant. Polystyrene and poly methyl methacrylate and copolymers characterized by FTIR, CNMR and Tg and tensile strength were measured according to ISO1567 standard.