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Type: Artigo de periódico
Title: Influence Of Adhesive Systems And Flowable Composite Lining On Bond Strength Of Class Ii Restorations Submitted To Thermal And Mechanical Stresses.
Author: Cavalcanti, Andrea Nóbrega
Mitsui, Fabio Hiroyuki Ogata
Ambrosano, Gláucia Maria Bovi
Marchi, Giselle Maria
Abstract: The purpose of this study was to evaluate the effect of adhesive systems and flowable composite lining on bond strength to gingival margins of Class II restorations after thermal/mechanical stresses. Proximal cavities were prepared in 90 bovine incisors. Teeth were assigned into nine groups (n = 10), according to the combination of bonding agent [Single Bond (SB), Optibond Solo Plus (OP), Prime & Bond NT (NT)] and layer (1 mm) of flowable composite Filtek Flow (FF) [absent, one layer, two layers]. Materials were applied according to manufacturers' instructions, and FF layers were photoactivated separately. Restorations were concluded with composite resin and were submitted to thermal (1000x, 5-55 degrees C) and mechanical stresses (100,000x, 80 N). For microtensile evaluation, slabs from the gingival bonded interface were obtained, tested under tension, and their failure mode was observed by scanning electron microscopy. Bond strength data were analyzed using two-way ANOVA/Tukey's test. No interaction was observed between adhesive systems and FF lining (p = 0.89). Also, no significant difference was found between bond strength values, whether or not FF layers were used (p = 0.33). However, bonding systems demonstrated significant differences (p = 0.01). SB and NT presented means higher than those observed with OP. Fracture modes varied considerably between experimental groups, and a greater frequency of cohesive failures was noted when FF layers were used.
Subject: Adhesives
Composite Resins
Dental Restoration Failure
Dental Stress Analysis
Dentin-bonding Agents
Hot Temperature
Microscopy, Electron, Scanning
Stress, Mechanical
Rights: fechado
Identifier DOI: 10.1002/jbm.b.30567
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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