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Type: Artigo de periódico
Title: Effects of various hydrogen peroxide bleaching concentrations and number of applications on enamel
Author: Berger, Sandrine Bittencourt
Soares, Luis Eduardo Silva
Martin, Airton Abrahão
Ambrosano, Gláucia Maria Bovi
Tabchoury, Cínthia Pereira Machado
Giannini, Marcelo
Abstract: 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.
Subject: dental enamel
bleaching agents
hydrogen peroxide
Editor: Faculdade de Odontologia de Piracicaba - UNICAMP
Rights: aberto
Identifier DOI: 10.1590/1677-3225v13n1a05
Date Issue: 1-Mar-2014
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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