Shear bond strength of heat-cured denture base resin to surface treated Co-Cr alloy with different methods

Lee, Sanghoon; Hwang, Sun Hong; Moon, Hong Seok; Lee, Keun Woo; Shim, June Sung

Abstract

STATEMENT OF PROBLEM: For the long-term success of removable partial dentures, the bonding between metal framework and denture base resin is one of the important factors. To improve bonding between those, macro-mechanical retentive form that is included metal framework design has been generally used. However it has been known that sealing at the interface between metal framework and denture base resin is very weak, because this method uses mechanical bonding. PURPOSE: Many studies has been made to find a simple method which induces chemical bond, now various bonding system is applied to clinic. In this experiment, shear bond strengths of heat-cured denture base resin to the surface-treated Co-Cr alloy were measured before and after thermocycling. Chemically treated groups with Alloy Primer(TM), Super-Bond C&B(TM), and tribochemically treated group with Rocatec(TM) system were compared to the beadtreated control group. The data were analyzed with two-way ANOVA. RESULT: 1. Shear bond strength of bead-treated group is highest, and Alloy Primer(TM) treated group, Super-Bond C&B(TM) treated group, Rocatec(TM) system treated group were followed. Statistically significant differences were found in each treated group(p<0.05). 2. Surface treatment and thermocycling affected shear bond strength(p<0.05), however there was no interaction between two factors(p>0.05). 3. Shear bond strengths of bead-treated group and Alloy Primer(TM) treated group showed no statistically significant difference before and after thermocycling(p>0.05), and those of Super-Bond CBTM treated group and RocatecTM system treated group showed statistically significant difference after thermocycling(p<0.05).