Permeability, roughness and topography of enamel after bleaching: tracking channels of penetration with silver nitrate

Authors

  • Ludmila C. Mendonça Federal University of Uberlândia
  • Lucas Zago Naves UNICAMP - University of Campinas; Federal University of Uberlândia
  • Lucas da Fonseca R. Garcia University of São Paulo
  • Lourenço Correr-Sobrinho University of Campinas
  • Carlos J. Soares Federal University of Uberlândia
  • Paulo Sérgio Quagliatto Federal University of Uberlândia

DOI:

https://doi.org/10.20396/bjos.v10i1.8641669

Keywords:

Enamel, Dentin, Silver nitrate

Abstract

Aim: This study evaluated the surface roughness, topography and permeability of bovine enamel by profilometry and scanning electron microscopy (SEM) with and without silver nitrate solution, after exposure to different bleaching agents. Methods: Fifty-two enamel samples were randomly divided into four groups (n=13): CP16% –16% carbamide peroxide - Whiteness Perfect; HP6% - 6% hydrogen peroxide - White Class; HP35% - 35% hydrogen peroxide Whiteness HP Maxx; and Control - not bleached and kept in artificial saliva. For roughness analysis, average surface roughness (Ra) and flatness coefficient (Rku) parameters were used. The topography and permeability were examined by SEM. For permeability evaluation, the samples were immersed in a 50% silver nitrate solution and analyzed using a backscattered electron and secondary electron mode. Results: For the roughness (Ra) evaluation, Kruskal-Wallis and Wilcoxon Signed Ranks Test were used, showing an increase on the surface roughness in all bleached groups. The Rku parameter suggested changes on enamel integrity. The SEM micrographs indicated changes on enamel topography and different levels of silver nitrate penetration in the samples of the bleached groups. In the overall analysis, the bleaching agents promoted surface changes and higher silver nitrate penetration when compared to the control group. Conclusions: It may be concluded that different bleaching agents might alter the topography and roughness of enamel surface. Moreover, the higher infiltration of silver nitrate suggests an easier penetration path for the oxygen molecules into the dentin substrate.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

Author Biographies

Ludmila C. Mendonça, Federal University of Uberlândia

Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia

Lucas Zago Naves, UNICAMP - University of Campinas; Federal University of Uberlândia

Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - University of Campinas. Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia

Lucas da Fonseca R. Garcia, University of São Paulo

Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo

Lourenço Correr-Sobrinho, University of Campinas

Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - University of Campinas

Carlos J. Soares, Federal University of Uberlândia

Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia

Paulo Sérgio Quagliatto, Federal University of Uberlândia

Department of Operative Dentistry and Dental Materials, Dental School,

Downloads

Published

2015-11-12

How to Cite

1.
Mendonça LC, Naves LZ, Garcia L da FR, Correr-Sobrinho L, Soares CJ, Quagliatto PS. Permeability, roughness and topography of enamel after bleaching: tracking channels of penetration with silver nitrate. Braz. J. Oral Sci. [Internet]. 2015 Nov. 12 [cited 2022 Dec. 10];10(1):1-6. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8641669

Issue

Section

Article