Effectiveness of dental bleaching in depth after using different bleaching agents
- Autores: Maria Beatriz Freitas D'Arce, Débora Alves Nunes Leite Lima, Flávio Henrique Baggio Aguiar, Eduardo dos Santos Bertoldo, Gláucia María Bovi Ambrosano, José Roberto Lovadino
- Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 5, Nº. 2, 2013, págs. 100-107
- Idioma: inglés
- Enlaces
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Resumen
Objectives:
This study evaluated the effectiveness of low- and high-concentration bleaching agents on enamel and deep dentin.
Study design:
Stained bovine incisors fragments were randomized placed into 10 groups (n=5), according to the sample thicknesses (2.0 mm or 3.5 mm) and bleaching agent: 10% carbamide peroxide (CP) (4 h a day/21 days);
6% hydrogen peroxide (HP) with calcium (1:30 h a day/21 days); HP 20% with calcium (50 min a day/3 sessions with a 7-day interval); HP 35% (3 x 15 min a day/3 sessions with a 7-day interval); HP 35% with calcium (40 min a day/3 sessions with a 7-day interval). The samples were stored in artificial saliva during the experiment. The co - lor change was evaluated using a spectrophotometer at the initial analysis, after artificially staining with black tea and after each of the bleaching weeks, and data was expressed in CIE Lab System values. The L* coordinate data was submitted to analysis of variance and Tukey-Kramer test and the ?E values data was submitted for analysis of variance in a split-plot ANOVA and Tukey's test (α=0.05).
Results:
None of the bleaching agents tested differed from the reflectance values on the enamel surface. For deep dentin HP 20% and HP 35%, both with calcium, showed the lowest reflectance values, which differed from CP 10%.
Conclusion:
It is concluded that high concentration hydrogen peroxide with calcium was less effective in deep dentin than 10% carbamide peroxide.
