Evaluation of adhesive remnant index after metal brackets removal using AutoCAD software

Introduction After the completion of treatment with fixed orthodontic appliances, it is necessary to remove the brackets and bands from teeth using an appropriate method. The aim of this study was to determine the most common way of bond failure between teeth and metal brackets, as well as to compare bond failure between the brackets and upper and lower premolars. Material and Method Metal brackets were bonded with Aspire composite material on 154 human premolars, extracted for orthodontic purposes. After debonding, the surface of remaining adhesive on the teeth and brackets was measured. Adhesive Remnant Index (ARI) was used to estimate bond failure between teeth and metal brackets. Results The average size of remaining adhesive surface after removing brackets from the upper premolars was 12.06 mm2 , while it was 9.32 mm2 on the lower premolars. The average size of the remaining adhesive surface area on the brackets removed from the upper premolars was 0.37 mm2 , while it was 2.08 mm2 on the brackets removed from lower premolars. A statistically significant difference was found between these values. The most common score of ARIteeth was 3 (85.71%) and the most frequent score of ARIbrackets was 0 (85.71%). Conclusion The most common way of bond failure between teeth and metal brackets was between the bracket base and adhesive surface. A statistically significant difference was found between the values of the size of residual adhesive surface on the upper and lower premolars as well as on the brackets debonded from them