Brackets bonding failure after in-office bleaching in vivo

Abstract

The aim of this in vivo study was to determine the effect of high concentration
35% hydrogen peroxide bleaching agent on metallic brackets bonding failure. Forty
patients who received first orthodontic treatment phase, were included in this study.
A split mouth technique was used; one arch exposed to in-office bleaching gel
containing 35% hydrogen peroxide for 30 minutes, while the unbleached arch served
as the control. Patients were divided into four groups: First two groups, the brackets
bonded 48 hours after bleaching while the third and fourth groups, brackets bonded 3
weeks after bleaching. The bracket failure was computed using independent T-test.
The higher bracket failure occurs in mandibular bleached group 48 hours before
bonding (18.33%) while the lowest bracket failure occurs in unbleached groups (1.67
%). Significant differences were showed in bracket failure between the mandibular
bleached teeth 3 weeks before bonding and those 48 hours before bonding. Adhesive
Remnant Index scores revealed that the majority of failure in bleached teeth occurred
in the enamel/resin interface. The 48 hours bleached teeth before bonding
significantly had a high bracket failure. We should increase the time lapse between
bleaching and bonding procedure more than 3 weeks to improve the bracket bonding
strength.