Shear bond strength of denture reline polymers to denture base polymers

Purpose: This study was undertaken to characterize the shear bond strength established between four denture base polymers and four denture reline poly mers. Materials and Methods: Cylindric columns of denture refine polymers w ere bonded to columns of denture base polymers. Specimens were immersed in water for 4 months and then thermocycled. The strength at which the bond fa iled under shear stress was recorded. Results: Significant differences in b ond strength existed among the specimens because of the denture base polyme r variable, the denture reline polymer variable, and their interaction (P < .05). A light-activated denture base polymer (Triad) bonded adequately wit h a light-activated reline polymer (Triad) but less well with the other rel ine polymers tested. The bond strength established between some denture bas e polymers and a different light-activated refine polymer (Rebaron LC) was relatively low. Conclusion: The type of denture base polymer and denture re line polymer affected the shear bond strength between them.