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Bond strength of metallic brackets after dental bleaching
Virna Cavalcante Patusco1, Gil Montenegro, Marcos Augusto Lenza
1Department of Orthodontics, Federal University of Goiania, Goiania, Brazil. virnapatusco@hotmail.com
The Angle Orthodontist
|January 7, 2009
Summary
At-home vital bleaching with 10% carbamide peroxide does not affect bracket bond strength. However, in-office bleaching using 35% hydrogen peroxide significantly reduces bond strength and resin remnants.
Area of Science:
- Dental Materials Science
- Orthodontic Adhesion
- Tooth Whitening Technologies
Background:
- Vital bleaching is a common cosmetic dental procedure.
- The effect of bleaching agents on the bond strength of orthodontic brackets is a critical clinical concern.
- Understanding potential impacts on adhesion is essential for successful treatment outcomes.
Purpose of the Study:
- To evaluate and compare the effects of at-home (10% carbamide peroxide) and in-office (35% hydrogen peroxide) vital bleaching on the shear bond strength of metallic orthodontic brackets.
- To determine if bleaching significantly alters the bond strength of composite resin used for bracket bonding.
Main Methods:
- Forty-five human premolars were divided into three groups: control, at-home bleaching, and in-office bleaching.
- Teeth were bleached using either 10% carbamide peroxide or 35% hydrogen peroxide.
- Metallic brackets were bonded with composite resin 24 hours after bleaching, and shear bond strength was measured.
Main Results:
- No statistically significant difference in shear bond strength was found between the control group and the at-home bleached group (10% carbamide peroxide).
- The in-office bleached group (35% hydrogen peroxide) exhibited a significantly lower mean shear bond strength compared to both the control and at-home bleached groups.
- A diminished amount of resin remnant was observed on the tooth surface after bracket debonding in the in-office bleached group.
Conclusions:
- The hypothesis that there is no difference between at-home and in-office bleaching on bracket bond strength is rejected.
- 10% carbamide peroxide at-home bleaching does not significantly impact the shear bond strength of metallic brackets.
- 35% hydrogen peroxide in-office bleaching significantly reduces bracket shear bond strength and affects resin remnant distribution.
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