Influence of Adhesive Application on the Bond Strength between Feldspathic Ceramic and Resin Cements

Aim: To evaluate the influence of an adhesive on the bond strength between feldspathic ceramic and two resin cements. In addition the interface between the resinous materials and the feldspathic ceramic was evaluated microscopically.

Methodology: Forty-eight feldspathic ceramic discs were imbedded in self-curing acrylic resin and randomly divided into four groups as follows (n=12 per group): G1 – hydrofluoric acid + silane + adhesive + RelyX ARC; G2 – hydrofluoric acid + silane + adhesive + RelyX U100; G3 – hydrofluoric acid + silane + RelyX ARC; G4 – hydrofluoric acid + silane + RelyX U100. Cones of composite resin were bonded to the ceramic surface using the resin cements and then light cured. After storage in distilled water at 37°C for 24 h, the specimens were subjected to tensile bond strength tests in a universal testing machine at a crosshead speed of 1 mm/minute. Analysis of Variance (ANOVA) and Tukey’s test (α=0.05) were used to statistically analyse the results.

Results: The bond strength means (MPa) followed by the same letter were not significantly different: G1 (28.34 MPa)a, G2 (28.05 MPa)a, G3 (21.92 MPa)b, G4 (18.19 MPa)b. Scanning Electron Microscopy images showed that the adhesive and the two resin cements infiltrated the surface irregularities created by the hydrofluoric acid.

Conclusion: Adhesive application on the ceramic that was etched with hydrofluoric acid and silanized increased the bond strength between the resin cements and the feldspathic ceramic.