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Eskelsen E, Catelan A, Hernades NMAP, et al. Physicochemical changes in enamel submitted to pH cycling and bleaching treatment. Clin Cosmet Investig Dent. 2018;10:281-286doi: 10.2147/CCIDE.S184683.
Eskelsen, E., Catelan, A., Hernades, N. M. A. P., Soares, L. E. S., Cavalcanti, A. N., Aguiar, F. H. B., & Liporoni, P. C. S. (2018). Physicochemical changes in enamel submitted to pH cycling and bleaching treatment. Clinical, cosmetic and investigational dentistry, 10281-286. https://doi.org/10.2147/CCIDE.S184683
Eskelsen, Evania, et al. "Physicochemical changes in enamel submitted to pH cycling and bleaching treatment." Clinical, cosmetic and investigational dentistry vol. 10 (2018): 281-286. doi: https://doi.org/10.2147/CCIDE.S184683
Eskelsen E, Catelan A, Hernades NMAP, Soares LES, Cavalcanti AN, Aguiar FHB, Liporoni PCS. Physicochemical changes in enamel submitted to pH cycling and bleaching treatment. Clin Cosmet Investig Dent. 2018 Dec 12;10:281-286. doi: 10.2147/CCIDE.S184683. eCollection 2018. PMID: 30588123; PMCID: PMC6296191.
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Clin Cosmet Investig Dent. 2018 Dec 12;10:281-286. doi: 10.2147/CCIDE.S184683. eCollection 2018.

Physicochemical changes in enamel submitted to pH cycling and bleaching treatment.

Clinical, cosmetic and investigational dentistry

Evania Eskelsen, Anderson Catelan, Natália Maria Aparecida Pinto Hernades, Luís Eduardo Silva Soares, Andrea Nóbrega Cavalcanti, Flávio Henrique Baggio Aguiar, Priscila Christiane Suzy Liporoni

Affiliations

  1. Department of Dentistry, University of Taubaté, Taubaté, São Paulo, Brazil, [email protected].
  2. Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil, [email protected].
  3. Laboratory of Biomedical Vibrational Spectroscopy, Research and Development Institute, University of Vale do Paraíba, São José dos Campos, São Paulo, Brazil.
  4. Department of Restorative Dentistry, School of Medicine and Public Health of Bahia and Federal University of Bahia, Salvador, Bahia, Brazil.

PMID: 30588123 PMCID: PMC6296191 DOI: 10.2147/CCIDE.S184683

Abstract

OBJECTIVE: The purpose of this study was to assess the hardness, mineral content, surface roughness, and micromorphology of sound and slightly demineralized enamels, before and after bleaching procedure using 10% carbamide peroxide.

METHODS: Sixty bovine dental blocks were randomly divided into the following two groups: 30 slabs were submitted to three cycles of pH and 30 slabs were noncycled. Hardness (n=10) was measured using the microhardness tester with Knoop indenter under a 50 g load for 5 seconds. The calcium/phosphate (Ca/P) ratio (n=10) was obtained using a micro-energy-dispersive X-ray fluorescence (μ-EDXRF) spectrometer. The measurement of roughness average (n=10) was performed using a surface roughness tester. Specimens were bleached 6 hours/day during 21 days, and then, physicochemical properties were re-evaluated. Two additional specimens were carried out to evaluate surface micromorphology using the scanning electron microscopy. Data were statistically analyzed by ANOVA and Tukey's test (α=0.05).

RESULTS: Sound and slightly demineralized enamels showed no difference in Ca/P ratio after dental bleaching according to the μ-EDXRF analysis, but the Ca/P ratio decreased after bleaching for slightly demineralized enamel. Bleaching treatment decreased the hardness and increased the surface roughness, causing micromorphology alterations.

CONCLUSION: Therefore, bleaching procedure promoted change in bovine enamel surface and increased the demineralization of slightly demineralized enamel but not affected the mineral content of sound enamel.

Keywords: chemical properties; dental enamel; microhardness; pH cycling; roughness; tooth bleaching

Conflict of interest statement

Disclosure The authors report no conflicts of interest in this work.

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