Comparison of Shear Bond Strength of Two Bonding Agents for Recycled Self-Ligating Brackets

Abstract

Introduction: Bracket dislodgment is a common orthodontic problem. The clinician might hasthe option of reusing the old bracket after recycling rather than replacing it with a new one.Purpose: This current invitro study was designed to compare the effect of recycling of selfligatingbrackets on shear bond strength (SBS) of both flowable composite and self-etch primer.Materials & Methods: Thirty extracted premolars were randomly divided into two groups of15 teeth per each according to the type of adhesive used. In group I, self-ligating (Damon) Bracketswere bounded with flowable composite Grandio Flow (GF) and in group II were bonded withTransbond plus self-etch primer (SEP). All the specimen were subjected to recycling by a low speedcarbide debonding burs. The Universal Testing Machine was used to measure SBS. The mode ofbond failure was evaluated by the adhesive remnant index (ARI). The data was analysed with T-testwhile ARI scores were evaluated by Wilcoxon test.Results: There was a significant difference between the two tested groups (P 0.05), for ARI, there was a nonsignificant difference between the two tested groups (P > 0.05).Conclusion: Self-ligating Damon brackets bonded with (GF) and (SEP) could be successfullyrecycled by low speed debonding bur. GF was superior in SBS.Key words: bond strength, recycling, self ligating brackets, adhesives.