Effects of various hydrogen peroxide bleaching concentrations and number of applications on enamel

Brazilian Journal of Oral Sciences

Sandrine Bittencourt Berger¹  Luis Eduardo Silva Soares¹  Airton Abrahão Martin¹  Gláucia Maria Bovi Ambrosano¹  Cínthia Pereira Machado Tabchoury¹  Marcelo Giannini¹ 

关键词: dental enamel;    bleaching agents;    hydrogen peroxide;   

DOI  :  10.1590/1677-3225v13n1a05

来源: SciELO

【 摘 要 】

AIM: To evaluate the effects of three hydrogen peroxide (HP) concentrations on enamel mineral content (MC), following three peroxide applications and using three methods to measure the MC. METHODS : Forty samples were obtained from bovine incisors and randomly divided into 4 groups (n=10). The control group remained untreated, while the experimental groups were tested for three HP concentrations (10%, 35% and 50%). The HP gel was applied 3 times on the enamel surface for 30 min per application and the samples were analyzed after each application. The MC of the enamel was determined before and after bleaching using Fourier transform (FT-Raman) spectroscopy and micro energy-dispersive x-ray fluorescence spectrometry (µEDXRF). The calcium (Ca) lost from the bleached enamel was quantified with an atomic absorption spectrometer (AAS). The data were analyzed statistically by ANOVA, Tukey and Dunnett´s tests (p<0.05). RESULTS: The FT-Raman showed a decrease in MC for all bleaching treatments, without influence of the different HP concentrations or the number of applications. µEDXRF did not detect any changes in MC. CONCLUSIONS: Ca loss was observed by the AAS, with no difference among the three HP concentrations. The FT-Raman and AAS analyses detected MC reduction and Ca loss after HP bleaching.

【 授权许可】

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