The effect of bead attachment systems on casting patterns and resultant tensile bond strength of composite resin veneer cast restorations

Abstract This study compared the difference in tensile bond strength between the composite resin veneer and the cast Ni-Cr disk when different bead adhesives were used to make the laboratory patterns. Visio-Gem, cyanoacrylate, and shellac were the adhesives tested. Fifty-six composite resin bonded Ni-Cr disks were prepared and tested to tensile failure with the Kemper-Kilian device. All tested samples showed a complex failure pattern. The results showed that the mean tensile bond strength of the cyanoacrylate group was significantly higher than the other two groups. No significant difference in the mean tensile bond strength was observed between the Visio-Gem and shellac groups. The higher tensile bond strength in the cyanoacrylate group is thought to be attributed to the low rheological property of the adhesive that allowed greater exposure of the bead for retention. Using different adhesives in the fabrication of composite resin veneered-castings may affect the bond strength in the composite resin-metal interface.