Failure Site and ARI Score of Rebonded Brackets Using No-Mix Adhesive Resins

Abstract

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-a-bond, 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.

Shear Bond Strength of Metal and Ceramic Brackets Depending on Etching Protocol in Direct Bonding Technique

“…Moreover, the etching protocol did not influence the risk of enamel failure, although the SE technique resulted in a weaker adhesion. However, the adhesive material remaining on the tooth's surface indicates a prolonged removal time and surface polishing [2,20]. The ARI scores presented in the literature endorse the notion that the bond strength values are correlated with the amount of material left on the enamel's surface after debonding.…”

“…After 30 s of exposure to 35-37% orthophosphoric acid, the enamel gains a favourable structure. Because of the selective dissolution of enamel prism cores or their peripheries, adhesive that is subsequently applied can penetrate into surface irregularities [10,[17][18][19][20]. On the other hand, the selfetching (SE) technique in orthodontics significantly reduced the chair-side time and risk of moisture contamination of the enamel's surface during bracket placements [18].…”

Bonding performance of self adhesive flowable composite to dentin pretreated with four different natural matrix metalloproteinases inhibitors

“…Each specimen was given a score according to the (ARI) (22) with a score scale from 0 to 3. An image analysis soft ware (Olympus cell B, Version 3.3) was used to record the specimens' scores.…”