Assessment of shear bond strength between three denture reline materials and a denture base acrylic resin

Purpose: This study reports the effect of five surface treatments on the bo nd strength established between three denture reline materials and a dentur e base resin. Materials and Methods: Cylindric columns of denture reline ma terials were bonded to columns of denture base resins that received one of the surface treatments: application of dichloromethane, the monomer of the denture base resin, the recommended bonding agent or the monomer of the den ture reline material, polishing with 240-grit silicone carbide paper, and a ir abrasion. A control group without surface treatment was included for eac h material. Specimens were immersed in water for 1 day and then thermocycle d. The strength at which the bond failed under shear was recorded. Results: None of the surface treatments significantly improved the bond strength of Kooliner. Triad bonding agent and denture base monomer applications most s ignificantly improved the bond strengths of Triad and GC reline, respective ly. Conclusion: Triad bonding agent and denture base monomer should be used in conjunction with Triad and GC reline, respectively, when relining a den ture base resin.