Journal Article

Effects of different silanes and acid concentrations on bond strength of brackets to porcelain surfaces

Göksu Trakyalı, Özlem Malkondu, Ender Kazazoğlu and Tülin Arun

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 31, issue 4, pages 402-406
Published in print August 2009 | ISSN: 0141-5387
Published online April 2009 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cjn118
Effects of different silanes and acid concentrations on bond strength of brackets to porcelain surfaces

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The aim of this study was to determine the optimum silane-coupling agent and the optimum concentration of acid agent when bonding to porcelain surfaces.

Eighty deglazed feldspathic porcelain discs with a diameter of 10 mm and a thickness of 2 mm mounted in acrylic resin blocks were randomly divided into four groups. In groups 1 and 2, the porcelain surfaces were etched with 9.6 per cent hydrofluoric (HF) acid and in groups 3 and 4 with 5 per cent HF acid. In groups 1 and 3, the Dynalock maxillary central incisor brackets were bonded with Pulpdent silane and Unite bonding adhesive and in groups 2 and 4 with Reliance silane and Unite. Shear forces were applied to the samples using an Instron universal test machine. The non-parametric Kruskal–Wallis test was used to determine significant differences in bond strengths between the four groups and Dunn's multiple comparison test to compare subgroups.

The mean bond strengths and standard deviations of groups 1 to 4 were 5.51 ± 1.19, 6.54 ± 0.002, 4.55 ± 1.93, and 6.39 ± 0.45 MPa, respectively. Specimens bonded with Reliance showed a statistically significantly higher in vitro bond strength than those bonded with Pulpdent. The concentration of etching gels did not result in any statistically significant difference on the in vitro bond strength when evaluated separately.

Journal Article.  3299 words. 

Subjects: Restorative Dentistry and Orthodontics

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