Abstract
The bond strength and the location of bond failure in the brackets bonded with a nano-composite to tooth enamel were studied and the results were compared with those of a conventional composite adhesive. Thirty human premolar teeth were divided into two groups. Composite adhesive (Transbond XT, 3M Unitek) and nano-composite (Filtek Z350 XT, 3M ESPE) adhesives were used for bonding the orthodontic brackets on the teeth in each group. The brackets were debonded with a sharp-edged debonding pliers in a universal testing machine. After debonding the brackets, the teeth surfaces under the brackets were inspected using a stereomicroscope to evaluate the adhesive remnant index (ARI). The experimental results indicated that the tensile bond strength measured by the modified diametral compression test, decreased when the brackets were bonded to tooth enamel by nano-composite instead of composite adhesive. However, the value of tensile bond strength for the bracket bonded with the nano-composite was more than the minimum value of tensile bond strength that has been recommended for successful clinical bonding. The adhesive remnant index score demonstrated that most of the bond failures in the composite adhesive and nano-composite groups were a combination of cohesive and adhesive failure at the enamel-adhesive and the bracket-adhesive interfaces. According to the ARI score, the use of the nano-composite would reduce the risk of enamel damages.
Published Version
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