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Journal of Nanomaterials
Volume 2015, Article ID 259753, 7 pages
http://dx.doi.org/10.1155/2015/259753
Research Article

Contact with Fluoride-Releasing Restorative Materials Can Arrest Simulated Approximal Caries Lesion

Department of Orthodontics and Pediatric Dentistry, University of São Paulo, Avenue Prof. Lineu Prestes, 2227 São Paulo, SP, Brazil

Received 15 June 2015; Revised 3 August 2015; Accepted 9 August 2015

Academic Editor: Tae-Yub Kwon

Copyright © 2015 Camila de Almeida Brandão Guglielmi 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

Previous studies have suggested that the presence of white-spot lesion is very probable when adjacent surface is affected by cavitated lesions. This study evaluated the potential of different fluoride-releasing restorative materials in arresting enamel white-spot lesions in approximal surface in contact with them, in vitro (I) and in situ (II). White-spot lesions were formed in 240 primary enamel specimens via pH-cycling. They were put in contact with cylindrical blocks of 6 materials (): composite resin, 2 high-viscous glass ionomer cements (HVGIC), resin-modified GIC, resin-modified nanoionomer, and polyacid-modified resin. In both studies I and II, these settings were designed to simulate the contact point between the restoration and simulated approximal lesion. For study I, they were subjected to a new pH-cycling cariogenic challenge for 7 or 14 days (). For study II, a randomized double-blind in situ design was conducted in two phases (7/14 days) to promote cariogenic challenge. At the end of both studies, specimens were collected for mineral analysis by cross-sectional microhardness. Higher mineral loss was observed for lesions in contact with resin (). HVGICs were the most efficient in preventing mineral loss, whereas other materials presented an intermediate behavior. It is concluded that fluoride-releasing materials can moderately reduce white-spot lesions progression, and HVGIC can arrest enamel lesion in approximal surface in contact with them.