Effect of Adhesive Primer on Shear Bond Strength between Resin Cements and Ni-Cr Casting Alloy

ABSTRACT

            The purpose of this study was to evaluate the effect of four primers, i.e., METAFAST (MF), Cesead II Opaque Primer (CP II) METAL PRIMER II(MP II), and ALLOY PRIMER(AP), on the shear bond strength between two resin cements, Panavia F (PF) and Superbond C\&B (SB), and Nickel-chromium (Ni-Cr) casting alloys. Two sizes of cylinder specimens (f7x2, f9x2mm, 100 pairs each) were cast. They were bonded  with ten combinations of four adhesive primer and two resin cements. Then they were stored in a 37±2 oC waterbath for 24 hrs, and subjected to the shear bond test using universal testing machine. Results showed the group that used PF with CP II and also demonstrated a significant difference compared to those without primer. The ones using SB with MF exhibited the greatest mean shear bond strength but no significant difference was found when compared with no primer. Conclusion of this study showed the use of CP II for bond between Ni-Cr casting alloy and PF resulted in a high bond strength. SB group was not necessary to use adhesive primer.Keywords adhesive primer resin cement, Ni-Cr casting alloy