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Objectives: Universal adhesives combine various monomers and coupling agents in a single bottle for versatility. The aim is to evaluate a universal adhesive as a primer on base metal alloy to increase bond strength with resin cement in light-cure and dual-cure mode.
Materials and Methods: Eighty alumina-blasted base-metal alloy specimens were divided into four groups according to surface treatment agent: 1- Single Bond Universal Adhesive (SBU); 2, 3, 4- three metal primers: Cesead N™ Opaque Primer (CN), Z-Prime™ Plus (ZP), and Alloy Primer (AP), each divided into light-cure and dual-cure subgroups. In light-cure mode, translucent resin composite rods were bonded with Rely X Ultimate resin cement onto the pre-treated specimens. In dual-cure mode, the rods, with metal-taped axial and top surfaces, were luted with the same cement. Luted specimens were stored in distilled water at 37˚C for 24 hours before shear bond strength test. One-way ANOVA was used for each curing mode separately; and t-test for each group pair in the two curing modes. Failure modes and cement-metal interfaces were examined.
Results: SBU groups showed no significant difference in mean shear bond strength compared with CN and ZP groups in both curing modes. Mean bond strength of SBU in light-cure mode was statistically higher than in dual-cure mode. There was no significant difference between curing modes of the three metal primer groups.
Conclusions: SBU could be used to increase bond strength of resin cement on base-metal alloy, instead of metal primers, despite a decrease in efficiency of SBU in dual-cure mode.