L'adhésif de la surface d'essai sur microtension affecte la résistance de l'Union entre une céramique feldspathique et le ciment en résine?

Abstract

Purpose: To evaluate the effect of the bonded surface area on the bond strength of a resin cement to a glass ceramic. Methods: Surfaces of 12 glass ceramic blocks (6x6x4mm3) were conditioned with 10% hydrofluoric acid and silanizated. The conditioned blocks were placed inside a silicone mold and the dual-cure resin cement was applied on the treated surface. Specimens were stored sectioned for obtaining samples with different bonded surface areas: Gr1 - 0.7mm x 0.7mm (0.5mm²), Gr2 - 1mm x 1mm (1mm²), Gr3 - 1.4mm x 1.4mm (2mm²). The non-trimmed beam samples were submitted to the microtensile bond strength test in a universal testing machine (cross-head speed: 1 mm/min). Data were statistically analyzed (ANOVA and Tukey’s test;? Pearson Correlation test). Results: The microtensile bond strength results were significantly affected by the bonded surface area (p<.0001). The highest bond strength (MPa) was of the Gr1 (26.3±8.2a), followed by Gr2 (20.8±6.5b) and Gr3 (16.1±5.7c). The Pearson correlation test revealed that there is an inverse correlation between bonded surface area and microtensile bond strength results (r=-0.5234; p<0.0001). Conclusion: The lowest bonded surface areas provided the highest values of bond strength.