Evaluation of five dental silanes on bonding a luting cement onto silica-coated titanium

Abstract

Objectives: Five commercial dental silanes were evaluated in vitro as adhesion promoters bonding a luting cement to silica-coated titanium surfaces. Methods: Titanium slides (n = 20) were cleaned with alumina sand and then silica-coated with a special sand consisting of alumina particles coated with silica. The bonding of a resin composite cement (3 M ESPE, Seefeld, Germany) to silica-coated and silanized titanium was evaluated by using the dental silane (RelyX™ Ceramic Primer) that belongs to the RelyX™ ARC cementing kit, and comparing it to four other dental silanes (Bisco Porcelain Primer™, Cimara™, ESPE Sil™, and Pulpdent™ Silane Bond Enhancer). The resin composite cement stubs (n = 8) were light-polymerized onto a silanized silica-coated titanium surface. The shear bond strength of the cement stubs was measured after dry storage and thermo-cycling 6000 times between 5 and 55 °C. The silanes and their reactions were chemically monitored by using Fourier transform infrared analysis. Results: Statistical analysis using ANOVA revealed that the brand of silanes and the types of storage condition differ significantly (p < 0.005). The highest shear bond strength was obtained with RelyX™ ceramic silane in dry conditions (19.5 ± 4.3 MPa), and after thermo-cycling (16.6 ± 3.5 MPa). The lowest results were obtained using Pulpdent™ Silane Bond Enhancer, in dry conditions (7.8 ± 2.2 MPa), and after thermocycling (5.3 ± 2.4 MPa). The analysis showed that silanes had different pH values. Some differences were detected between the silanes and their reactions. Conclusions: Dental silanes provide different bonding strengths and have differences in their pH, solvent system and silane concentration. © 2006 Elsevier Ltd. All rights reserved.