Tensile strengths of three luting agents for adhesion fixed partial dentures

This study investigated the effects of thermal stress and specimen storage time on the tensile bond strength of three prosthodontic adhesives: Comspan (LD Caulk), Panavia Opaque (Kuraray), and Super-Bond (Sun Medical). Rexillium III alloy cylinders were cast, bonded end-to-end, and subsequently tested for tensile strength. Storage conditions of 2 and 30 days at 37 degrees C were evaluated. Half of the specimens were thermocycled for 24 hours (1,080 cycles) between 5 and 60 degrees C. Mean bond strengths and mode of failures were recorded. Significant differences related to the adhesive systems and the specimen storage time were noted. Thermocycling did not significantly affect the bond strength of the systems tested.