Evaluation of an alternative technique to optimize direct bonding of orthodontic brackets to temporary crowns.

Autor:	Dias FM; Universidade Ceuma, São Luís, Maranhão, BR., Pinzan-Vercelino CR; Department of Orthodontics, Universidade Ceuma, São Luís, Maranhão, BR., Tavares RR; School of Dentistry, Universidade de São Paulo, Bauru, São Paulo, BR., Gurgel Jde A; Universidade Ceuma, São Luís, Maranhão, BR., Bramante FS; Universidade Ceuma, São Luís, Maranhão, BR., Fialho MN; Universidade Ceuma, São Luís, Maranhão, BR.
Jazyk:	angličtina
Zdroj:	Dental press journal of orthodontics [Dental Press J Orthod] 2015 Jul-Aug; Vol. 20 (4), pp. 57-62.
DOI:	10.1590/2176-9451.20.4.057-062.oar
Abstrakt:	Objective: To compare shear bond strength of different direct bonding techniques of orthodontic brackets to acrylic resin surfaces. Methods: The sample comprised 64 discs of chemically activated acrylic resin (CAAR) randomly divided into four groups: discs in group 1 were bonded by means of light-cured composite resin (conventional adhesive); discs in group 2 had surfaces roughened with a diamond bur followed by conventional direct bonding by means of light-cured composite resin; discs in group 3 were bonded by means of CAAR (alternative adhesive); and discs in group 4 had surfaces roughened with a diamond bur followed by direct bonding by means of CAAR. Shear bond strength values were determined after 24 hours by means of a universal testing machine at a speed of 0.5 mm/min, and compared by analysis of variance followed by post-hoc Tukey test. Adhesive remnant index (ARI) was measured and compared among groups by means of Kruskal-Wallis and Dunn tests. Results: Groups 3 and 4 had significantly greater shear bond strength values in comparison to groups 1 and 2. Groups 3 and 4 yielded similar results. Group 2 showed better results when compared to group 1. In ARI analyses, groups 1 and 2 predominantly exhibited a score equal to 0, whereas groups 3 and 4 predominantly exhibited a score equal to 3. Conclusions: Direct bonding of brackets to acrylic resin surfaces using CAAR yielded better results than light-cured composite resin. Surface preparation with diamond bur only increased shear bond strength in group 2.
Databáze:	MEDLINE
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