Reinforcing effect of glass fiber-reinforced composite reinforcement on flexural strength at proportional limit of a repaired denture base resin

摘要

Objective : This study evaluated the reinforcing effect of glass fiber-reinforced composite (FRC) reinforcement on flexural strength at the proportional limit (FS-PL) of a repaired denture base resin.Materials and methods : Repaired denture base resins reinforced with metal and with FRC reinforcement, and that without reinforcement were tested. The ultimate flexural strength, the FS-PL and the elastic modulus of repaired denture base resins were tested. The joint efficiency (times) of the repaired denture base resins on the intact denture base resin was evaluated.Results : The repaired denture base resins reinforced with metal reinforcement and with FRC reinforcement had significantly higher ultimate flexural strength than the repaired denture base resin without reinforcement (p ??0.05) and were not significantly different from each other (p ??0.05). The FS-PL of a repaired denture base resin reinforced with the FRC reinforcement was similar to that with the metal reinforcement (p ??0.05), and these were significantly higher than the FS-PL of a repaired denture base resin without reinforcement (p ??0.05). The elastic modulus of the repaired denture base resin reinforced with the FRC reinforcement was significantly lower than that with metal reinforcement (p ??0.05) and was significantly higher than that without reinforcement (p ??0.05). The joint efficiency of the FRC reinforced specimen was 0.98.Conclusion : The FRC reinforcement had a reinforcing effect on the FS-PL of a repaired denture base resin.