Shear bond strength of luting cements to fixed superstructure metal surfaces under various seating forces

Abstract

PURPOSE. In this study, the shear bond strengths (SBS) of luting cements to fixed superstructure metal surfaces under various seating forces were investigated. MATERIALS AND METHODS. Seven different cements [Polycarboxylate (PCC), Glass-lonomer (GIC), Zinc phospahate (ZPC), Self-adhesive resin (RX13), Resin (C&B), and Temporary cements ((RXT) and (TCS))l were bonded to a total number of 224 square blocks (5x5x3 mm) made of one pure metal [Titanium (CP 11) and two metal alloys [Gold-Platinum (Au-Pt) and Cobalt-Chrome (Co-Cd under 10 N and 50 N seating forces. SBS values were determined and data were analyzed with 3-way ANOVA. Pairwise comparisons and interactions among groups were analyzed with Tukey's simultaneous confidence intervals. RESULTS. Overall mean scores indicated that Co-Cr showed the highest SBS values (1.96 +/- 0.4) (P.05). The PCC cement showed the highest mean SBS score (3.59 +/- 0.07) among all cements tested (P<.00), while the resin-based temporary luting cement RXT showed the lowest (0.39 +/- 0.07) (P<.00). CONCLUSION. Polycarboxylate cement provides reliable bonding performance to metal surfaces. Resin-based temporary luting cements can be used when retrievability is needed. GIC is not suitable for permanent cementation of fixed dental prostheses consisting of CP Ti or Au Pt substructures.