Does Silane Application Affect Bond Strength Between Self-Adhesive Resin Cements and Feldspathic Porcelain?

This study aimed to evaluate the shear bond strengths of six self-adhesive resin cements (SACs) on porcelain surfaces and to compare the effectiveness with and without silane application. One hundred and twenty feldspathic porcelain specimens were prepared, etched with 9.5% HF, and divided into two main groups: (i) without silane, and (ii) with silane application. Each main group was further divided into six subgroups, testing six various SACs. Shear bond strength was measured using a universal testing machine, and the de-bonded surfaces were examined with a stereomicroscope. The statistical analysis was tested with two-way ANOVA and post hoc with Tukey's. The results showed that Panavia SA Luting Multi had the highest shear bond strength, especially with silane application, while G-Cem One exhibited the lowest in the absence of silane. The addition of silane application significantly improved the shear bond strengths of G-Cem One, Panavia SA Luting Multi, and RelyX Unicem compared to situations without silane application. The adhesive and mixed failure modes were found to depend on the brand of SACs. No cohesive failure was detected. The study concludes that Panavia SA Luting Multi achieves superior shear bond strength on feldspathic porcelain when used with a separate silane agent. The etched feldspathic porcelain surface primed with silane coupling agent is recommended for optimal bond strength when using with SACs such as G-Cem One, Panavia SA Luting Multi, or RelyX Unicem.