Abstract
Abstract 
 The aim of this study was to evaluate the effect of different commercial silanes on microshear bond strength of resin cement to lithium disilicate ceramic. Twenty ceramic samples with 10 mm in length, 10 mm wide and 3 mm in thickness were fabricated, etched with 10% hydrofluoric acid for 20 seconds, and divided into 5 groups, according to the commercial silane applied: G1- RelyX Ceramic Primer (3M ESPE), G2- Angelus Silane, G3- Prosil (FGM), G4- Dentsply Silane (Dentsply) and G5- Bis-Silane (Bisco). Silanes were applied in accordance to manufacturers’ recommendations. Addition silicone molds with 1 mm in thickness, 10 mm in diameter and 3 perforations with 1 mm in diameter each one, were placed on ceramic and filled with the resin cement Rely X ARC (3M ESPE) in all groups. Light activation was performed with LED Bluephase G2 (Ivoclar Vivadent) at 1200 mW/cm2, for 30 seconds. Samples were maintained in 100% humidity at 37°C for 24 hours and submitted to microshear test. The data (MPa) were submitted to one-way ANOVA and Tukey test (α=0.05). The results obtained for each group were: G1: 22.39±2.99; G2: 23.35±4.08; G3: 26.05±5.46; G4: 18.56±4.09; G5: 25.26±4.10. Statistical analysis showed significantly lower microshear bond strength for G4. Fracture pattern analysis showed predominance of adhesive failures in G1 and G2. G3 and G5 presented higher percentage of cohesive failures in ceramic, and G4 showed mixed, adhesive and cohesive fractures with similar percentages. It was concluded that different silanes showed influence on the lithium disilicate ceramic – resin cement bond strength.
 Key Words: Silanes. Ceramics. Cementation. Shear strength.
 
Highlights
Ceramics have increasingly become the best option of esthetic restoration of dental structures
Ceramic specimens fabrication Twenty specimens with 10mm in length, 10mm wide and 3 mm in thickness were prepared using IPS e.max Press ceramic system (Ivoclar Vivadent, Schaan, Liechtenstein), shade LT A2, following the manufacturer’s instructions
The results of this study confirmed the hypothesis that different silanes affect the bond between lithium disilicate ceramic and resin cement when submitted to microshear test
Summary
Ceramics have increasingly become the best option of esthetic restoration of dental structures. Ceramic systems, which contain high strength materials such as zirconia, can be fixed with conventional cement. Silica-based ceramic systems, such as lithium disilicate, are routinely cemented by the adhesive technique through resin cements (ATTIA, 2011; ZORTUK et al, 2010; GARBOZA et al, 2016). These resin cements present some advantages when compared to the zinc phosphate cement, as a higher resistance to compression, low solubility, and better elastic modulus (around 8 GPa) (BORGES et al, 2003)
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