Effect of Dimethacrylates in Resin Cement on Durability against Thermal Stress of Adhesion to Titanium

The present study examined the effect of crosslinking of resin cement on durability of adhesion between titanium and resin against repeated thermal stress. Titanium disks, polished and treated with a phosphate monomer, were bonded to acrylic rods with resins composed of poly (methyl methacrylate), methyl methacrylate containing 0 approximately 5% dimethacrylates or diacrylate as crosslinking agent, and a benzoyl peroxide/amine initiator system. The bonded specimens were subjected to thermocycling in water and then tensile strength testing. The addition of 5% crosslinking agent, irrespective of its type, to the resin resulted in a significant decrease in bond strength after 500 thermocycles. No significant difference in durability was revealed among the five crosslinking agents studied.