Longitudinal bond strength evaluation using the deproteinized dentin technique
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2009-07-01
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This study evaluated bond strength to dentin as a result of storage time for conventional adhesive systems (with or without collagen) that had been deproteinized with 10% sodium hypochlorite (NaOCl). For this study, 72 human molars were sectioned in a mesiodistal axial plane and embedded in acrylic resin; at that point, the vestibular and lingual surfaces were worn down with abrasive paper. Acid etching was performed for 15 seconds (using 37% phosphoric acid) and the specimens were divided into 12 groups (n = 6), depending on the adhesive system used, the dentin treatment performed, and the length of evaluation (24 hours or six months). A resin composite was inserted over the prepared area with the aid of a metal matrix. Following a mechanical shear test, fractured surfaces were analyzed by stereomicroscope and the data were submitted to ANOVA and Tukey's test. It was concluded that the dentin deproteinization treatment with 10% NaOCI improved the bond strength in five of the six groups. The bond strength after 24 hours was significantly higher than the bond strength measured after six months. Of the three adhesive systems tested in this study, DenTASTIC UNO demonstrated the lowest bond strength.
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bisphenol A bis(2 hydroxypropyl) ether dimethacrylate, Dentastic, dentin bonding agent, hypochlorite sodium, methacrylic acid derivative, phosphoric acid, polymethacrylic acid derivative, Prime and Bond NT, resin, resin cement, single bond, analysis of variance, chemistry, dental bonding, dental care, dental etching, dentin, drug effect, human, methodology, molar tooth, nonparametric test, shear strength, time, Analysis of Variance, Bisphenol A-Glycidyl Methacrylate, Composite Resins, Dental Bonding, Dental Etching, Dental Stress Analysis, Dentin, Dentin-Bonding Agents, Humans, Methacrylates, Molar, Phosphoric Acids, Polymethacrylic Acids, Resin Cements, Shear Strength, Sodium Hypochlorite, Statistics, Nonparametric, Time Factors
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General Dentistry, v. 57, n. 4, p. 328-333, 2009.