Detachment of brackets is major dilemma in orthodontic practice. With regard to spending extra time by orthodontist and also patient for replacement of debonded brackets, this study has priority and importance to find the best scientific method to perform such procedure.
Various studies have been performed for comparing and evaluating shear bond strength of reattached brackets. These studies have often similar and sometimes contradictory results.
Methods:
50 sound human premolars were selected in this study. They were mounted on the acrylic blocks. A bracket was bonded on each tooth. Samples were debonded (control group) with using Instron device. They were divided into 2 groups of 25 teeth. In one group, brackets were rebonded after sand blasting and in another; brackets were rebonded after reconditioning the base with composite.
Then all of the samples were debonded again with Instron device and their shear bond strength was recorded. Also brackets mesh base were S.E.M evaluated in new samples and recycled samples.
Results:
Based on study results, the mean shear bond strength in control group was 172.11 N and in recycled group with sand blasting method was 165.89 N and in reconditioned group with etching method was 144.23 N. There were no significant differences between 3 groups.
Conclusions:
According to the results, differences between control group and recycled group and reconditioned group were not significant. (p>0.05)