“…Intraoral repeated masticatory forces lead to fatigue fracture, while extraorally impact fracture may occur as a result of dropping the denture onto the hard surface. Many attempts to improve the mechanical properties of polymethyl methacrylate (PMMA) have included using alternate polymers such as polycarbonate 3) , nylon 4,5) , copolymers 6,7) and urethane dimethacrylate (UDMA) 8,9) , and incorporating of butadiene-styrene rubber into PMMA matrix 10,11) . As another attempt, various fiber or chip materials [12][13][14][15][16] such as carbon, aramid and glass have been added into PMMA resin for reinforcing materials, and metal wires and meshes have ordinary been used for reinforcing materials to prevent the midline fracture of denture.…”