Effect of deproteinization and tubular occlusion on microtensile bond strength and marginal microleakage of resin composite restorations

Dentin adhesion procedure presents limitations, especially regarding to lifetime stability of formed hybrid layer. Alternative procedures have been studied in order to improve adhesion to dentin. The aim of this study was to evaluate in vitro the influence of deproteinization or dentin tubular occlu...

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Bibliographic Details
Published in:	Journal of applied oral science Vol. 17; no. 5; pp. 462 - 466
Main Authors:	Baseggio, Wagner, Consolmagno, Elaine Cristina, de Carvalho, Flávia Lunardelli Negreiros, Ueda, Julio Katuhide, Schmitt, Vera Lucia, Formighieri, Luis Alberto, Naufel, Fabiana Scarparo
Format:	Journal Article
Language:	English
Published:	Brazil Faculdade de Odontologia de Bauru da Universidade de São Paulo 01-10-2009 Faculdade De Odontologia De Bauru - USP University of São Paulo
Subjects:	Acid Etching, Dental Adhesive dentin Bisphenol A-Glycidyl Methacrylate - chemistry Coloring Agents Composite Resins - chemistry Dental Bonding Dental Cavity Preparation Dental Leakage - classification Dental Marginal Adaptation Dental Materials - chemistry Dentin - ultrastructure Dentin-Bonding Agents - chemistry DENTISTRY, ORAL SURGERY & MEDICINE Humans Methylene Blue Original Oxalates Oxalates - chemistry Oxidants - chemistry Phosphoric Acids - chemistry Silicon Dioxide - chemistry Smear Layer Sodium hypochlorite Sodium Hypochlorite - chemistry Stress, Mechanical Temperature Tensile Strength Time Factors Water - chemistry Zirconium - chemistry Sodium hypochlorite Adhesive dentin Oxalates
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Summary:	Dentin adhesion procedure presents limitations, especially regarding to lifetime stability of formed hybrid layer. Alternative procedures have been studied in order to improve adhesion to dentin. The aim of this study was to evaluate in vitro the influence of deproteinization or dentin tubular occlusion, as well as the combination of both techniques, on microtensile bond strength (microTBS) and marginal microleakage of composite resin restorations. Extracted erupted human third molars were randomly divided into 4 groups. Dentin surfaces were treated with one of the following procedures: (A) 35% phosphoric acid gel (PA) + adhesive system (AS); (B) PA + 10% NaOCl + AS; (C) PA + oxalate + AS and (D) PA + oxalate + 10% NaOCl + AS. Bond strength data were analyzed statistically by two-way ANOVA and Tukey's test. The microleakage scores were analyzed using Kruskal-Wallis and Mann-Whitney non-parametric tests. Significance level was set at 0.05 for all analyses. microTBS data presented statistically lower values for groups D and B, ranking data as A>C>B>D. The use of oxalic acid resulted in microleakage reduction along the tooth/restoration interface, being significant when used alone. On the other hand, the use of 10% NaOCl alone or in combination with oxalic acid, resulted in increased microleakage. Dentin deproteinization with 10% NaOCl or in combination with oxalate significantly compromised both the adhesive bond strength and the microleakage at interface. Tubular occlusion prior to adhesive system application seems to be a useful technique to reduce marginal microleakage.
ISSN:	1678-7757 1678-7765 1678-7765 1678-7757
DOI:	10.1590/S1678-77572009000500021