Failure site and ARI score of rebonded brackets using no-mix adhesive resins

Abstract

© 2016 Trans Tech Publications, Switzerland. To evaluate failure sites and ARI scores of re-bonded brackets after debonding of three no-mix adhesive brands. 120 teeth were divided into 2 groups for bonded and rebounded (60 teeth/group) and 3 subgroups (20 teeth/subgroup) for three no-mix adhesive, System1+, Rely-abond, and Unite. Tooth surface and bracket base were inspected by low power light microscope (10X) after debonding. The failure sites were assessed and residual adhesives was recorded using the Adhesive Remnant Index (ARI). The failure sites were expressed in percentage and Chi-square was used to determine significant differences in the ARI scores among groups (p< 0.05). After rebonding brackets, the failure site of no mix adhesive in bonding were changed to cohesive layer in rebonding group except Unite adhesive. ARI scores of all adhesive were changed from score 2 in bonding group to score 3 in rebonding group after debonding bracket. There were significant (p<0.05) differences in the ARI scores between bonded and rebonded groups except Unite and System1+ and between Unite groups. The results showed that the failure site mostly changed to cohesive layer and ARI changed to Score 3 in three no-mix adhesives after debonding in rebonding brackets.