Comparative Evaluation of Shear Bond Strength of Orthodontic Metal Bracket Bonded with the Conventional Adhesive System and Moisture Insensitive Primer System on a Tooth Surface Which has Undergone Bleaching with 35% Hydrogen Peroxide - An Study.

Background And Objectives: Today, orthodontic bracket bonding on the tooth surface is a vital phase in any orthodontic therapy as strong tooth-bracket bonding is essential for success and efficiency. Tooth whitening is popular due to tooth discolouration and patient need for esthetic changes. This study compared the shear bond strength (SBS) and adhesive remnant index (ARI) of brackets bonded with a conventional and moisture-insensitive primer system on tooth surfaces bleached with 35% hydrogen peroxide in dry and moisture conditions.

Methods: Fifty-six healthy humans with extracted maxillary first premolars were cleaned using a periodontal curette, rinsed, treated with 35% hydrogen peroxide, and kept in a 0.1% thymol aqueous solution at room temperature. These teeth were embedded in orthodontic acrylic resin in four groups: the conventional primer system in dry conditions, the conventional primer system in moist conditions using artificial saliva, the moisture insensitive primer system in dry conditions, and the moisture insensitive primer system in moist conditions. After bonding metal brackets to tooth surfaces bleached with 35% hydrogen peroxide, universal testing machine and a stereomicroscope were used to calculate SBS and ARI.

Results And Discussion: SBS and ARI values were the lowest in the conventional primer system in moist conditions, with statistically significant differences between groups. The study's findings match earlier research. research should evaluate SBS and ARI to support findings.

Conclusion: In the current study, moisture was found to be a factor affecting SBS and ARI. The moisture-insensitive bonding system was found to be resistant to effects of moisture compared with the conventional system.