Abstract
Purpose. This study evaluated the effects of four adhesive primers on the shear bond strength of a self-curing resin to cobalt-chromium alloy. Material and methods. The adhesive primers Acryl Bond (AB), Cesead Opaque Primer (COP), Metal PrimerII (MPII), and MR Bond (MRB) were used. A brass ring placed over the casting alloy disk surface nonprimed or primed with each primer was filled with the self-curing methyl methacrylate–polymethyl methacrylate resin. The specimens were stored in water at 37° C for 24 hours and then alternately immersed in water baths at 4° C and 60° C for 1 minute each for up to 20,000 thermal cycles before shear mode testing at a crosshead speed of 0.5 mm/min. Results. All the primers examined improved the shear bond strength between the resin and cobalt-chromium alloy compared with nonprimed specimens before thermal cycling. However, after 20,000 thermal cycles, the bond strengths of resin to cobalt-chromium alloy primed with COP or MPII primers were significantly greater than those of specimens primed with AB or MRB primers and nonprimed controls. Conclusion. This study indicated that COP and MPII are effective primers to obtain higher bond strength between resin and cobalt-chromium alloy.
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