Table of Contents
International Scholarly Research Notices
Volume 2015, Article ID 935264, 7 pages
http://dx.doi.org/10.1155/2015/935264
Research Article

Effect of Nano-Tricalcium Phosphate and Nanohydroxyapatite on the Staining Susceptibility of Bleached Enamel

1Operative Department, Shahed Dental School, Shahed University, Tehran, Iran
2Dental Research Center, Shahed Dental School, Shahed University, Tehran, Iran
3Iran Polymer and Petrochemical Institute (IPPI), Tehran, Iran
4Oral and Dental Diseases Research Center, Kerman University of Medical Sciences, Kerman, Iran

Received 7 March 2015; Revised 28 April 2015; Accepted 1 May 2015

Academic Editor: Qingling Feng

Copyright © 2015 Mohammad Bagher Rezvani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. This study was designed to evaluate the effect of nano-tricalcium phosphate (n-TCP) and nanohydroxyapatite (n-HAP) on prevention of restaining of enamel after dental bleaching. Methods. Forty bovine incisors were bleached with 20% carbamide peroxide for two weeks. Afterward, they were divided into five groups based on remineralization solution: no treatment (control), 10% n-TCP, 5% n-TCP, 10% n-HAP, and 5% n-HAP. Each group was daily immersed for 10 minutes in the restaining solution (tea) and for 3 minutes in the remineralization agent, respectively. This protocol was repeated for five days. Subsequently, three digital photographs (baseline, after bleaching, and after restaining) were analyzed by Adobe Photoshop software. The obtained , , , and parameters were compared using ANOVA and Wilcoxon and Bonferroni tests. Results. After bleaching, there were significant changes in tooth colors () while, after restaining and immersion in remineralization solutions, there were no significant differences in , , and values of different groups (). However, of 10% TCP was significantly lower than the control () while there were no significant differences between the other groups (). Conclusion. 10% n-TCP could significantly maintain the resultant color and reconstruct the enamel structure after bleaching.