Effect of different concentrations of nanohydroxyapatite on tooth bleaching effectiveness and enamel bond strength

Authors

  • Laura Nobre Ferraz Department of Restorative Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.
  • Waldemir Francisco Vieira Júnior Department of Restorative Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.
  • Gláucia Maria Bovi Ambrosano Department of Social Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.
  • Maria Cecília Caldas Giorgi Department of Operative Dentistry – School of Health Sciences – Amazonas State University – Manaus – AM – Brazil.
  • Flávio Henrique Baggio Aguiar Department of Restorative Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.
  • Débora Alves Nunes Leite Lima Department of Restorative Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.

DOI:

https://doi.org/10.14295/bds.2018.v21i1.1512

Abstract

Objective: To evaluate the effect of 35% hydrogen peroxide (35% HP) combined to different concentrations of nanohydroxyapatite (nHA) on the effectiveness of dental bleaching (superficial enamel and deep dentin) and enamel bond strength. Material and Methods: Fifty bovine dental specimens (5x5x2mm) were divided into 5 groups, according to the treatments (n = 10): no bleaching (negative control); 35% HP (positive control); 35% HP+ 5% nHA; 35% HP + 10% nHa; and 35% HP + 15% nHA. Three in-office bleaching sessions were made. The color analysis was performed on the enamel surface and the opposite dentin, using a spectrophotometer. The results were expressed in the CIE L*a*b* system. After this, the adhesive system was applied to the tooth structure, and the dental specimens received a composite restoration. The microshear bond strength test was performed 24 h after the restoration. Data were submitted to ANOVA and Tukey's test (?=0.05). Results: For the enamel color analysis, all bleached groups differed statistically from the unbleached group, with increasing L* values and decreasing b* values. The addition of different concentrations of nHA did not interfere with the bleaching effectiveness for the enamel and opposite dentin. For microshear bond strength, no statistically significant differences were presented between groups. The adhesive failure rate of the 35% HP + 10% nHA group was lower than the 35% HP group and similar to the negative control. Conclusion: The addition of different concentrations of nHA in 35% of hydrogen peroxide did not interfere with the bleaching efficacy of enamel and deep dentin and did not affect the enamel bond strength after bleaching

 

Keywords

Enamel; Shear strength; Tooth bleaching.

 

Downloads

Download data is not yet available.

Author Biography

Laura Nobre Ferraz, Department of Restorative Dentistry – Piracicaba Dental School – University of Campinas – Piracicaba – SP – Brazil.

Departamento de Odontologia Restauradora, Área de Dentística

Downloads

Additional Files

Published

2018-03-28

How to Cite

1.
Ferraz LN, Vieira Júnior WF, Ambrosano GMB, Giorgi MCC, Aguiar FHB, Lima DANL. Effect of different concentrations of nanohydroxyapatite on tooth bleaching effectiveness and enamel bond strength. BDS [Internet]. 2018 Mar. 28 [cited 2025 Aug. 21];21(1):17-25. Available from: https://ojs.ict.unesp.br/index.php/cob/article/view/1512

Issue

Vol. 21 No. 1 (2018): Jan. - Mar. / 2018 - Published March 2018

Section

Clinical or Laboratorial Research

License

Brazilian Dental Science uses the Creative Commons (CC-BY 4.0) license, thus preserving the integrity of articles in an open access environment. The journal allows the author to retain publishing rights without restrictions.

=================

COPYRIGHT TRANSFER AND RESPONSIBILITY STATEMENT
 (PDF)

For all articles published in the BDS journal, copyright is retained by the authors. Articles are licensed under an open-access Creative Commons CC BY 4.0 license, meaning that anyone may download and read the paper for free. In addition, the article may be reused and quoted, provided that the original published version is cited. These conditions allow for maximum use and exposure of the work while ensuring that the authors receive proper credit. All metadata associated with published articles is released under the Creative Commons CC0 Universal Public Domain Dedication.

Before the submission, authors must obtain permission to reproduce any published material (figures, schemes, tables, or any extract of a text) that does not fall into the public domain or for which they do not hold the copyright. Permission should be requested by the authors from the copyright holder (usually the Publisher, please refer to the imprint of the individual publications to identify the copyright holder).

The authors hereby attest that the study is original and does not present manipulated data, fraud, or plagiarism. All names listed made a significant scientific contribution to the study, are aware of the presented data, and agree with the final version of the manuscript. They assume complete responsibility for the ethical aspects of the study.

This text must be printed and signed by all authors. The scanned version should be submitted as supplemental file during the submission process.

Most read articles by the same author(s)