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Type: Artigo de periódico
Title: Long-term TEM analysis of the nanoleakage patterns in resin-dentin interfaces produced by different bonding strategies
Author: Reis, AF
Giannini, M
Pereira, PNR
Abstract: Objectives. The aim of this study was to evaluate the ability of etch-and-rinse and self-etching adhesive systems to prevent time- and water-induced nanoleakage in resin-dentin interfaces over a 6-month storage period. Methods. Five commercial adhesives were tested, which comprise three different strategies of bonding resins to tooth hard tissues: one single-step self-etching adhesive (One-up Bond F (OB), Tokuyama); two two-step self-etching primers (Clearfil SE Bond (SE) and an antibacterial fluoride -containing system, Clearfil Protect Bond (CP), Kuraray Inc.); two two-step etch-and-rinse adhesives (Single Bond (SB), 3M ESPE and Prime&Bond NT (PB), Dentsply). Restored teeth were sectioned into 0.9 mm thick slabs and stored in water or mineral oil for 24h, 3 or 6 months. A silver tracer solution was used to reveal nanometer-sized water-filled spaces and changes that occurred over time within resin-dentin interfaces. Characterization of interfaces was performed with the TEM. Results. The two two-step self-etching primers showed little silver uptake during the 6-month experiment. Etch-and-rinse adhesives exhibited silver deposits predominantly within the hybrid layer (HL), which significantly increased for SB after water-storage. The one-step self-etching adhesive OB presented massive silver accumulation within the HL and water-trees protruding into the adhesive layer, which increased in size and quantity after water-storage. After storage in oil, reduced silver deposition was observed at the interfaces for all groups. Significance. Different levels of water-induced nanoleakage were observed for the different bonding strategies. The two-step self-etching primers, especially the antibacterial fluoride-containing system CP, showed the least nanoleakage after 6 months of storage in water. (C) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Subject: nanoleakage
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Dental Materials. Elsevier Sci Ltd, v. 23, n. 9, n. 1164, n. 1172, 2007.
Rights: fechado
Identifier DOI: 10.1016/
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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