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Bonding to previously bleached teeth
1The University of Melbourne, Australia.
Australian Orthodontic Journal
|August 17, 2001
Summary
Home bleaching treatments do not impact the bond strength of orthodontic brackets to enamel. This study found no significant difference in bracket adhesion to bleached versus unbleached enamel surfaces.
Area of Science:
- Dental Materials Science
- Orthodontics
- Esthetic Dentistry
Background:
- Concerns exist regarding reduced bond strength of restorative materials to bleached enamel.
- Increasing adult orthodontic treatment necessitates understanding bleaching effects on bracket adhesion.
Purpose of the Study:
- To evaluate the effect of at-home bleaching on the shear/peel bond strength of orthodontic brackets bonded to enamel.
- To compare bond strengths using light-cured composite resin and resin-modified glass-ionomer cements.
Main Methods:
- Sixty extracted premolar teeth were divided into six groups.
- Teeth were bonded with two types of cements to unbleached enamel or bleached enamel at 24 hours and 14 days post-bleaching.
- Shear/peel bond strength testing was performed to simulate clinical conditions.
Main Results:
- No statistically significant difference was observed in the shear/peel bond strength between brackets bonded to bleached and unbleached enamel.
- Both light-cured composite resin and resin-modified glass-ionomer cements demonstrated comparable bond strengths.
Conclusions:
- At-home bleaching with Nite Lite does not adversely affect the bond strength of commonly used orthodontic bonding cements.
- Clinicians can be assured that bleaching does not compromise bracket adhesion in orthodontic treatment.