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Colour assessment of bleaching effect on orthodontically treated teeth
Effimia Koumpia1, Theodore Eliades2, Michael Knösel3,4
1Department of Orthodontics, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
European Journal of Orthodontics
|March 14, 2022
Summary
External tooth bleaching is more effective in teeth previously treated with orthodontics, especially after a longer retention period. Canine color change was more pronounced than incisors, with effects diminishing over time.
Area of Science:
- Dental Aesthetics
- Orthodontics
- Tooth Whitening
Background:
- External tooth bleaching is a common cosmetic dental procedure.
- Orthodontic treatment can influence tooth color and the response to bleaching.
Purpose of the Study:
- To compare the efficacy of external tooth bleaching between untreated teeth and teeth that have undergone orthodontic treatment.
Main Methods:
- Three groups were studied: orthodontically treated (debonded and retention phases) and untreated individuals.
- Subjects received either a 38% hydrogen peroxide bleaching treatment or a placebo.
- Tooth color changes (L*, a*, b*, ΔΕ) were measured using a spectrophotometer at multiple time points.
Main Results:
- Bleaching increased L* and decreased b* and a* values in all groups.
- Statistically significant differences in ΔE, L*, and b* were observed between bleached untreated and bleached retention subgroups.
- Canines showed greater color change than incisors, with effects decreasing over time.
Conclusions:
- Previous orthodontic treatment influences external tooth bleaching efficacy.
- Bleaching is more effective in teeth after orthodontic treatment, particularly with longer retention periods.
- Canine bleaching efficacy is higher than incisors, and the effect is time-dependent.
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