Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

Authors

  • Andréia Mara Andrade Pizani Universidade Paulista – UNIP
  • Beatriz Tholt Universidade Veiga de Almeida – UVA
  • Katia Regina Hostilio Cervantes Dias Universidade Federal do Rio de Janeiro – UFRJ
  • Pedro Paulo Albuquerque Cavacanti de Albuquerque Universidade de São Paulo – USP
  • Celso Silva Queiroz Universidade Veiga de Almeida – UVA

DOI:

https://doi.org/10.20396/bjos.v14i2.8640831

Keywords:

Bleaching agents, Calcium, Hydrogen peroxide, Dental enamel

Abstract

Aim: To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. Methods: One hundred specimens of human teeth were ground and polished and had the initial microhardness evaluated. The specimens were randomly assigned into five groups (n=20): Group 1 - Control group (no treatment); Group 2 - Home Peroxide 6% (without calcium); Group 3 - Home Peroxide 7.5% (without calcium); Group 4 - White Class 6% (with calcium); Group 5 - White Class 7.5% (with calcium). For each group, the bleaching was performed according to the manufacturer’s specifications. The specimens were bleached once a day for 5 days and subjected to pH cycling. Microhardness and scanning electron microscopy (SEM) analysis were performed before and after bleaching. Results: The results showed that groups submitted to bleaching treatment presented hardness loss compared to the control group. The group of 7.5% hydrogen peroxide with calcium showed a lower percentage of hardness loss in relation to other groups. Conclusion: Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.

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Author Biographies

Andréia Mara Andrade Pizani, Universidade Paulista – UNIP

Universidade Paulista – UNIP, School of Dentistry, Department of Restorative Dentistry, São Paulo.

Beatriz Tholt, Universidade Veiga de Almeida – UVA

Universidade Veiga de Almeida – UVA, School of Dentistry, Department of Restorative Dentistry, Rio de Janeiro.

Katia Regina Hostilio Cervantes Dias, Universidade Federal do Rio de Janeiro – UFRJ

Universidade Federal do Rio de Janeiro – UFRJ, School of Dentistry, Department of Restorative Dentistry, Rio de Janeiro.

Pedro Paulo Albuquerque Cavacanti de Albuquerque, Universidade de São Paulo – USP

Universidade de São Paulo – USP, School of Dentistry, Departament of Biomaterials and Oral Biology, São Paulo.

Celso Silva Queiroz, Universidade Veiga de Almeida – UVA

Universidade Veiga de Almeida – UVA, School of Dentistry, Department of Restorative Dentistry, Rio de Janeiro

Published

2015-07-01

How to Cite

1.
Pizani AMA, Tholt B, Dias KRHC, Albuquerque PPAC de, Queiroz CS. Dental bleaching agents with calcium and their effects on enamel microhardness and morphology. Braz. J. Oral Sci. [Internet]. 2015 Jul. 1 [cited 2022 Dec. 8];14(2):154-8. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640831

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Article