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KMID : 0358920140410020125
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Journal of the Korean Academy of Pedodontics
2014 Volume.41 No. 2 p.125 ~ p.133
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Effect of Various Surface Treatment Methods on Shear Bond Strength of Orthodontic Brackets to Aged Composite Resin
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Park Jong-cheol
Park Ho-Won
Lee Ju-Hyun
Seo Hyun-Woo
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Abstract
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The purpose of this study was to investigate the effect of various surface treatment methods on the shear bond strength of orthodontic brackets in vitro. Ninety six specimens, 6 mm in diameter and 5 mm in height, were made with composite resin (Filtek[TM] Z350 XT, 3M ESPE, USA) and treated with an aging procedure. After aging, the specimens were randomly separated in six groups: (1) control with no surface treatment, (2) 37% phosphoric acid gel, (3) 4% hydrofluoric acid gel, (4) sodium bicarbonate particle abrasion, (5) diamond bur, and (6) 1 W carbon dioxide laser for 5s. The metal brackets were bonded to composite surfaces by means of an orthodontic adhesive (Transbond XT, 3M Unitek, USA). Shear bond strength values were evaluated with a universal testing machine (R&B Inc., Korea). Analysis of variance showed a significant difference between the groups. Group 5 had the highest mean shear bond strength (11.9 MPa), followed by group 6 (11.1 MPa). Among the experimental groups, group 2 resulted in the weakest mean shear bond strength (5.22 MPa). The results of this study suggest that the repair shear bond strength of the aged composite resin was acceptable by surface treatment with a carbon dioxide laser.
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KEYWORD
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Carbon dioxide laser, Surface treatment, Shear bond strength, Orthodontic bracket
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