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Related Experiment Videos

Can previously bleached teeth be bonded safely?

Tancan Uysal1, Faruk Ayhan Basciftci, Serdar Uşümez

  • 1Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|June 14, 2003
PubMed
Summary

Office bleaching with hydrogen peroxide does not impact the shear bond strength of orthodontic brackets. This study found no significant difference in bond strength, regardless of immediate or delayed bracket placement after bleaching.

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Area of Science:

  • Dental Materials Science
  • Orthodontic Technology
  • Biomaterials

Background:

  • In-office bleaching with 35% hydrogen peroxide is common.
  • Potential impact on dental adhesive bond strength is a concern.
  • Orthodontic bracket bonding requires reliable adhesion.

Purpose of the Study:

  • To evaluate the effect of 35% hydrogen peroxide bleaching on the shear bond strength of metallic orthodontic brackets.
  • To compare bond strength immediately after bleaching versus after a 30-day aging period.

Main Methods:

  • Sixty premolars were divided into three groups: control (no bleaching), immediate bonding post-bleaching, and bonding after 30 days post-bleaching.
  • Shear bond strength was measured in MPa using a universal testing machine.

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  • Adhesive Remnant Index (ARI) scores analyzed failure sites.

    • Main Results:

    • No statistically significant differences in shear bond strength were found between the control, immediate bonding, and delayed bonding groups (P >.05).
    • Significant differences in ARI scores were observed across all groups.
    • Failure sites differed: control group showed bracket/adhesive interface failures, while bleached groups exhibited cohesive or adhesive/enamel interface failures.

    Conclusions:

    • In-office hydrogen peroxide bleaching does not compromise the shear bond strength of metallic orthodontic brackets.
    • Bonding can be performed immediately or after 30 days post-bleaching without affecting bond strength.
    • Bleaching alters bracket failure modes, shifting from bracket/adhesive to cohesive or adhesive/enamel interfaces.