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Effectiveness of dental bleaching in depth after using different bleaching agents
Maria B F D'Arce1, Débora A N L Lima2, Flávio H B Aguiar2
1DDS, MS, PhD Student. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Piracicaba, SP, Brazil.
Journal of Clinical and Experimental Dentistry
|January 24, 2014
Summary
High concentration hydrogen peroxide with calcium was less effective for deep dentin bleaching than 10% carbamide peroxide. This study compared various dental bleaching agents on enamel and dentin effectiveness.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
Background:
- Dental bleaching is a common esthetic procedure.
- The effectiveness of bleaching agents can vary based on concentration and substrate.
Purpose of the Study:
- To evaluate the efficacy of low- and high-concentration bleaching agents on enamel and deep dentin.
- To compare carbamide peroxide and hydrogen peroxide formulations with and without calcium.
Main Methods:
- Bovine incisor fragments were exposed to different bleaching agents (10% carbamide peroxide, 6%, 20%, 35% hydrogen peroxide) with varying application protocols and calcium additives.
- Sample thickness (2.0 mm or 3.5 mm) was considered.
- Color change was measured using spectrophotometry (CIE Lab values) after staining and during bleaching treatment.
Main Results:
- No significant differences in reflectance values were observed on the enamel surface among the tested bleaching agents.
- For deep dentin, 20% and 35% hydrogen peroxide with calcium exhibited the lowest reflectance values, indicating reduced effectiveness compared to 10% carbamide peroxide.
Conclusions:
- High-concentration hydrogen peroxide with calcium demonstrated lower effectiveness in bleaching deep dentin compared to 10% carbamide peroxide.
- Agent concentration and substrate depth influence dental bleaching outcomes.
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