Abstract
Bracket debonding strength related to diverse debonding methods and enamel demage has not been assessed in vivo. The study hypothetized a direct relationship between these three parameters. Debonding strength was measured clinically in the wings method and base method on 50 patients in a split mouth method using a calibrated debonding plier. Brackets from 30 of these patients were scanned in SEM and EDAX for adhesive remnant index and enamel calcium remnants. Base method debonding force was significantly greater than wings method (163.5±68.7N, 106.1±66.2N, respectively, p<0.001). A positive adhesive remnant index score was found in both methods (68.7%, 66.7%, respectively). Debonding strength vs. adhesive remnant index or calcium index scores were not correlated. However, the latter two were significantly correlated (0.524<R<0.895, p<0.031). Half of the debonding failures developed at the adhesive enamel interface. The results warnts the potential of enamel damage during debonding.
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