Chemical composition and microhardness of human enamel treated with fluoridated whintening agents. A study in situ

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2017xmlui.dri2xhtml.METS-1.0.item-files-viewOpen
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Petta, Thais de Mendonça
Gomes, Yasmin do Socorro Batista de Lima
Esteves, Renata Antunes
Faial, Kelson do Carmo Freitas
Couto, Roberto Souza D'Almeida
Silva, Cecy Martins
xmlui.dri2xhtml.METS-1.0.item-abstract
Background: Dental whitening has been increasingly sought out to improve dental aesthetics, but may cause chemical and morphological changes in dental enamel surfaces.
Objective: Assess in situ the effects of high-concentration hydrogen peroxide with and without fluoride on human dental enamel using the ion chromatography test (IC) and the Knoop hardness test (KHN).
Material and Methods: Nineteen enamel specimens were prepared using third human molars. These specimens were fixed on molars of volunteers and were divided into groups: OP38-Opalescence Boost PF38%, PO37-Pola Office 37.5% and CO-Control group. For chemical analysis (n= 3), the dentin layer was removed, keeping only the enamel, which was subjected to acidic digestion by microwave radiation. It was necessary to perform sample dilutions for the elements fluorine (F), calcium (Ca) and phosphorus (P) for quantification using the IC test. The KHN (n= 5) was performed before and after the treatments. Five indentations were made, separated by 100 µm, for each specimen using a load of 25 gf for 5 seconds in the microdurometer. The data were analyzed using ANOVA with a 5% significance level.
Results: The OP38 group had the largest concentrations of F, Ca and P ions. The PO37 group showed the lowest concentrations of F and Ca ions. The average KHN was not significantly different between the OP38 and PO37 groups.
Conclusion: Enamel whitened with hydrogen peroxide containing fluoride had greater concentrations of F, Ca and P ions. The presence of fluoride in the whitening agent did not influence the enamel microhardness.
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PETTA, Thais de Mendonça et al. Chemical composition and microhardness of human enamel treated with fluoridated whintening agents. A study in situ. Open Dentistry Journal, v. 11, p. 34-40, Jan. 2017.xmlui.dri2xhtml.METS-1.0.item-decsPrimary
Clareadores Dentários / efeitos adversosEsmalte Dentário / química
Esmalte Dentário / efeitos de drogas
Peróxido de Hidrogênio / efeitos adversos
Fluoretos / efeitos adversos
Dente Molar
Teste de Materiais
Cromatografia por Troca Iônica / métodos
Testes de Dureza / métodos