Effects of adhesive primers for noble metals on shear bond strengths of resin cements

Abstract

Objectives: The purpose of this study was to evaluate the durability and shear bond strengths of the different combinations of two adhesive primers and three resin cements to two types of noble metal alloys, silver-palladium-copper-gold and type IV gold alloys. Methods: The adhesive luting agents Imperva Dual, Panavia 21 and Super-Bond C&B, and the adhesive primers Metal Primer and V-Primer were used. Two sizes of casting alloy disks were nonprimed or primed and cemented with each adhesive luting agent. The specimens were stored in 37 °C water for one day and then immersed alternately in 4 °C and 60 °C water baths for 1 min each for up to 100,000 thermal cycles before shear mode testing at a cross-head speed of 0.5 mm/min. Results: The application of Metal Primer was effective for improving the shear bond strengths between each of the three resin cements and both noble metal alloys compared with nonprimed specimens. When each noble metal alloy was cemented with Super-Bond C&B. there were no significant differences between the bond strengths with the use of Metal Primer and those with the use of V-Primer at 100,000 thermal cycles. However, V-Primer was ineffective for enhancing the shear bond strengths of Imperva Dual and Panavia 21 to noble metals. Conclusion: Metal Primer and V-Primer are clinically useful for strongly bonding adhesive resin cements to noble metal alloys.