[Tensile loading behavior of different conditioned and bonded metal test samples]

The purpose of this research was to analyze simultaneously the effect of 4 factors (metal conditioning, bonding agent, metal silicoating and water storage) on the tensile behavior of a Bis-GMA resin (microfilled) bonded Ni-Cr-Be alloy by analysis of variance with a multifactorial design. The results showed that metal surface conditioning and the presence of bonding agent had no effect. In contrast, water storage of 33 days or silicoating influenced significantly and positively the tensile bond strength. In addition, 2 significant factor-interactions were detected: a) between silicoating and water storage and b) between metal surface conditioning (sandblasting/etching) and silicoating. Metal sandblasting followed by silicoating reacted more favorably than the combination etching/silicoating. In all cases the mechanochemical adhesion (silicoating technique) resulted in a composite bond strength that was far superior to that of conventional, pure mechanical bonding.