Abstract

Aim: To assess the shear bond strength of a microhybrid compound resin (3M-ESPE, St. Paul, MN, USA) to a feldspar ceramic (Noritake EX-3), using different silanization protocols and qualify the failures types resulting from these different treatment protocols. 
Materials and methods: Were manufactured 120 ceramic pellets, included in PVC pipes. Surfaces were conditioned with hydrofluoric acid at 10% for 60s, then rinsed and dried. Blocks were divided into four groups: G1 (without silane); G2 (silane air-dried for 3 minutes at room temperature); G3 (silane dried in a heating chamber at 50 °C for 5 minutes); G4 (silane cooled at 10 °C for 5 minutes). Following surface silanization, the adhesive was applied and photopolymerized for 10s. A matrix was fit in the PVC pipe, where a portion of resin was inserted, and then photopolymerized for 40 s. Test specimens were subjected to thermal cycling for 5,000 cycles at 5°C, 37.5°C and 55°C. Then, the shear mechanical test was conducted. Tabulated data were analyzed with D’Agostino's normality test, one-way ANOVA and Tukey's test. 
Results: We found no significant differences in force and strength between experimental groups (p>0.05). 
Conclusions: Silanization protocols showed no effect on the samples shear strength. There was also no significant association between type of failure and treatment.

Keywords

composite resins, dental porcelain, shear strength, water, other components, magnifying glass, cohesive, mixed, adhesive, bath of silane, hot water, silanization protocol, porcelain, resin, alcohol, acetone, ceramics, viscosity, adhesive systems