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Abstract

The aim of this study is to evaluate the shear bond strengths of metal brackets using two different fluoridereleasing adhesives (Light bond and Enlight) activated by two photoactivation systems [a conventional halogen light-curing system (HLC), and a plasma arc light curing system (PALC)]. Methods: Forty extracted premolars were divided into four groups of ten. Stainless steel brackets were bonded to the teeth using either a halogen light with a 20-second curing time or a plasma arc light with a 4-second curing time. After being immersed in a 37°C distilled water bath for 24 hours, the brackets were debonded. The bond strengths were tested on a testing machine at a crosshead speed of 0.5 mm/minute. The bracket failure interface was observed by SEM and an adhesive remnant index (ARI) score was recorded for each tooth. Results: The bond strengths of the four groups ranged from 7.78 ± 2.01 MPa to 9.42 ± 3.12 MPa. There were no significant differences among the four groups in terms of bond strength or ARI score. Conclusions: The results indicate that plasma arc light with a 4-second curing time is able to produce a similar bond strength and bracket-failure type as a longer halogen light curing time when used with either types of fluoride-releasing orthodontic adhesive.

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