Strengths of composite bonded to base metal alloy using dentin bonding systems

Statement of problem. Many different bonding systems are currently availabl e that map be used to bond composite to base metal alloy. Purpose. This study measured and compared bond strengths of composite with a base metal alloy using 8 modern dent-in bonding systems. Material and methods, Base metal alloy buttons were imbedded in acrylic and ground with 120, 400, and 600 grit sandpaper, respectively. Metal surfaces were air abraded for 5 seconds with 50 mu m aluminum oxide, washed for 5 s econds under running tap water, then dried with compressed air. Specimens w ere arbitrarily divided into 8 groups of 10 specimens. Each group was treat ed with 1 of 8 dentin bonding regimens. A hybrid composite (Herculite) was placed onto thr treated metal surface and light polymerized. Specimens were incubated at 37 degrees C in distilled water fur 2 hours. Shear bond stren gths were measured and the collected data subjected to an ANOVA, followed b y multiple t-tests. Results. All-Bond 2 exhibited the highest mean shear bond strength and Pana via 21 with primer had the lon est in the tests conducted. Conclusion. All-Bond 2 demonstrated significantly higher shear bond strengt hs over all materials tested, except 3M Single Bond and Optibond FL. No sig nificant difference was noted between the single component and the multicom ponent bonding systems.