A research anddevelopment of a denture base polymer applied a polymer blend method to urethane

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PMMA powders were fully dissolved in methyl methacrylate (MMA)and then the PMMA-MMA mixtures were mixed with UDMA. Light-curing poly-methyl methacrylate (PMMA)-UDMA resins were prepared by a polymer blend method. The flexural strength and fracture toughness of cured PMMA-UDMA (SH-500B) polymers showed no significant difference compared with those of commercially available heat- and chemical-curing acrylic resins (control). The fracture toughness of cured PMMA-UDMA (UV-7000B) polymers was superior to that of cured PMMA-UDMA (SH-500B) polymers. Mixing ratios of PMMA-UDMA was small affected to the flexural properties.