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Resistance to Degradation of Resin-Dentin Bonds Produced by One-Step Self-Etch Adhesives

Published online by Cambridge University Press:  06 December 2012

Manuel Toledano ,
Inmaculada Cabello ,
Monica Yamauti ,
Marcelo Giannini ,
Fátima S. Aguilera ,
Estrella Osorio  and
Raquel Osorio
Manuel Toledano*
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
Inmaculada Cabello
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
Monica Yamauti
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
Marcelo Giannini
Affiliation:
Piracicaba School of Dentistry, State University of Campinas, Piracicaba, Sao Paulo, Brazil
Fátima S. Aguilera
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
Estrella Osorio
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
Raquel Osorio
Affiliation:
University of Granada, Faculty of Dentistry, Dental Materials Section, Colegio Máximo de Cartuja s/n, 18071, Granada, Spain
*
*Corresponding author. E-mail: [email protected]
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Abstract

The objective of this article is to evaluate the resistance to degradation of resin-dentin bonds formed with three one-step adhesives. Flat, mid-coronal dentin surfaces were bonded with the self-etching adhesives [Tokuyama Bond Force (TBF), One Up Bond F Plus (OUB), and G-Bond (GB)]. The bonded teeth were subjected to fatigue loading, chemical degradation, and stored in distilled water for four time periods (up to 12 months). Specimens were tested for microtensile bond strength and microleakage. Fractographic analysis was performed by scanning electron microscopy. Bonded interfaces were examined by light microscopy using Masson's trichrome staining. An atomic force microscope was employed to analyze phase separation and surface nanoroughness (Ra) at the polymers. Vickers microhardness and the degree of the conversion (DC) were also determined. ANOVA and multiple comparisons tests were performed. Bond strength significantly decreased after the chemical challenge, but not after load cycling. Aging decreased bond strength after 6 months in TBF and GB, in OUB after 12 months. An increase of the nonresin protected collagen zone occurred in all groups, after storing. TBF showed the highest roughness, microhardness, and DC values, and GB showed the lowest. Mild self-etch one-step adhesives (TBF/OUB) showed a higher degree of cure, lower hydrophilicity, and major resistance to degradation of resin-dentin bonds when compared to highly acidic self-etching adhesive (GB).

Keywords

self-etchadhesivesdentinbonding efficacymicroleakagesurface properties
Type
Biological Applications
Information
Microscopy and Microanalysis , Volume 18 , Issue 6 , December 2012 , pp. 1480 - 1493
Copyright
Copyright © Microscopy Society of America 2012

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