Abstract
Basic properties of thermoplastic resins for denture base polymer (nylon resin: VLP, polycarbonate resin: PCB, acetal resin: ACT, polyethylene terephthalate resin: EST), which is referred to "non clasp denture," were examined to compare with those of heat-cured acrylic resin (PMMA). The flexural strengths and moduli of PCB and EST, and the properties of VLP and ACT were two-thirds and one-third of those of PMMA, respectively. The abrasion losses of thermoplastic resins were less than one-fifth of that of PMMA. The shear bond strengths of a chemical cured acrylic resin to PCB and EST were 1.5 times greater than that of PMMA, but those of VLP and ACT were very small. The color differences before and after coffee immersion of all specimens were less than 5, while those between before and after curry solution of VLP and EST were greater than 10. The water sorptions of VLP and EST were greater than those of the other products and one-third of that of PMMA. The water solubilities of thermoplastic resins were smaller than that of PMMA.
