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International Journal of Dentistry
Volume 2017, Article ID 1579652, 7 pages
https://doi.org/10.1155/2017/1579652
Research Article

Chlorhexidine Prevents Root Dentine Mineral Loss and Fracture Caused by Calcium Hydroxide over Time

1Post-Graduate Program of Dentistry, Federal University of Maranhão (UFMA), São Luis, MA, Brazil
2Department of Public Health, Federal University of Maranhão (UFMA), São Luis, MA, Brazil
3Department of Dental Materials, Federal University of Maranhão (UFMA), São Luis, MA, Brazil
4Department of Pediatric Dentistry, Federal University of Maranhão (UFMA), São Luis, MA, Brazil
5Department of Endodontics, Federal University of Maranhão (UFMA), São Luis, MA, Brazil

Correspondence should be addressed to Soraia De Fátima Carvalho Souza; moc.liamg@aiarosodne

Received 30 December 2016; Revised 15 March 2017; Accepted 29 March 2017; Published 30 April 2017

Academic Editor: Kee Y. Kum

Copyright © 2017 Michael Ranniery Garcia Ribeiro 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

Purpose. To evaluate the mineral ion loss of root dentine after treatment with 2% chlorhexidine solution (CHX) and to compare its yield and flexural strength (fs) after exposure to calcium hydroxide [Ca(OH)2]. Materials and Methods. Dentine bars (DB) were made from 90 roots of bovine incisors and randomized into three groups: : distilled/deionized water (DDW), : 2.5% sodium hypochlorite + 17% EDTA, and : CHX + DDW. The release of phosphate (PO4) and calcium (Ca) ions was measured by spectrophotometry. The DB were exposed to Ca(OH)2 paste for 0, 30, 90, and 180 days. DB were subjected to the three-point bending test to obtain yield and fs values. The fracture patterns were evaluated (20x). Data were analyzed using Kruskal-Wallis and Dunn’s post hoc tests or one- and two-way ANOVA followed by Tukey’s post hoc test (). Results. showed lower and Ca2+ ionic release than (). For yield and fs, in all periods (), except for yield strength values on 90 days (). A larger frequency of vertical fractures was observed in and that of oblique fractures in (). Conclusions. CHX prevented and Ca2+ loss and showed a tendency to preserve the yield and fs of root dentine over time following exposure to Ca(OH)2 paste.