Bond Strength of Highly Cross-linked Layers of Abrasion-resistant Plastic Denture Teeth Bonded to Pour-type Denture Base Resin

Bond strength between abrasion-resistant plastic denture teeth bonded to pour-type denture base resin was measured to evaluate the effect of five kinds of surface treatment. Bond strength to the enamel layer of teeth was significantly improved by applying of silane coupling agent. Etching of the enamel layer by 5% of hydrofluoric acid (HF) also improved the bond strength. The maximum bond strength was obtained from the surface which was etched by HF and then applied urethane dimethacrylate-based light-activated monomers (HF+UDMA treatment). Bond strength to the dentin layer of teeth was also significantly improved by HF+UDMA treatment. There was no significant reduction of the bond strength to the dentin layer after the thermo-cycling test (10, 000 cycles), but statistically significant reduction was observed in the enamel layer. The results of this study suggested that the HF + UDMA treatment would be a useful method to improve the bond strength between highly cross-linked enamel and dentin layers of abrasion-resistant plastic denture teeth and pour-type denture base resin.