Evaluation of the infl uence of porcelain conditioning techniques in orthodontic brackets bonding

Camila Belo FALCÃO, Adriano Marques BRITO, Fernando Jorge Mendes AHID

Aim: The aim of this study was to evaluate the infl uence of various porcelain surface treatments on the strength of orthodontic brackets bonded to porcelain and the fracture mode after debonding. Methods: Eighty samples of porcelain were randomly divided into four groups according to their surface preparation, as follows: (G1) diamond bur, (G2) diamond bur with silane, (G3) hydrofl uoridic acid and (G4) hydrofl uoridic acid with silane. After surface treatment the Edgewise brackets (Morelli) were bonded with resin (Transbond XT, 3M) and sheared off. The KruskalWallis statistical test were applied on the data. Results: There were no statistically significant differences in bond strength between the groups (p > 0.05) and the fracture mode in most of the porcelain occurred in the composite/bracket interface. The G1 had an resistance average of 3.35, G2 = 3.97, G3 = 2.56 and G4 = 3.10.

Keywords: Bonding. Brackets. Porcelain.

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