Clinical Bonding Durability Assessment of Rebonded Brackets considering ARI Score

Introduction: Debonding is known as one of the main problems in orthodontics. Rebonding thesebrackets require clinical chair time and is a nuisance and costly process in the course of orthodontictreatment. Clinical bonding durability of new brackets in comparison with rebonded brackets withdifferent Adhesive Remnant Index (ARI) scores has been investigated in this study.Methods: The subjects of this study consisted of 76 debonded brackets of maxillary first and secondpremolars. According to ARI scoring after debonding, brackets were divided into two groups. 27debonded brackets with composite residual value (ARI) greater than or equal to 90% were assignedto group A (ARI≥4) and 28 brackets to group B (ARI≤2) with a composite residual value less thanor equal to 10%. The third group was used as a control group in which 21 new brackets were used.Findings: Similar bonding durability time was recorded in group A (ARI≥4) and group C (newbrackets) which was significantly higher than of group B (ARI≤2).Conclusion: Debonded brackets with high ARI score (ARI≥4) and new brackets have the sameperformance on bonding durability. Therefore, a high ARI debonded bracket can be used instead of anew bracket for rebonding.

کلیدواژه ها:

Bonding Durability ، ARI Score ، Bracket Rebonding ، Debonding