The European Journal of Orthodontics Advance Access originally published online on April 1, 2009
The European Journal of Orthodontics 2009 31(4):402-406; doi:10.1093/ejo/cjn118
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Effects of different silanes and acid concentrations on bond strength of brackets to porcelain surfaces
*
lu**
* Department of Orthodontics
** Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Turkey
Address for correspondence Göksu Trakyal, Yeditepe Universitesi, Di
Hekimlii Fakültesi, Bagdat Cad. No: 238, Goztepe 34728, Istanbul, Turkey, E-mail: goksu.trakyali{at}yeditepe.edu.tr
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Abstract |
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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.