Publicação: Use of one-bottle adhesive as an intermediate bonding layer to reduce sealant microleakage on saliva-contaminated enamel
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2000-08-01
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Purpose: To evaluate the influence of three different adhesives, each used as an intermediary layer, on microleakage of sealants applied under condition of salivary contamination. Materials and Methods: Six different experimental conditions were compared, 3 with adhesives and 3 without. After prophylaxis and acid etching of enamel, salivary contamination was placed for 10 s. In Group SC the sealant was applied after saliva without bonding agent and then light-cured. In Group SCA, after saliva, the surface was air dried, and then the sealant was applied and cured. In Groups ScB, SB and PB, a bonding agent (Scotchbond Dual Cure/3M, Single Bond/3M and Prime & Bond 2.1/Dentsply, respectively) was applied after the saliva and prior to the sealant application and curing. After storage in distilled water at 37°C for 24 hrs, the teeth were submitted to 500 thermal cycles (5°C and 55°C), and silver nitrate was used as a leakage tracer. Leakage data were collected on cross sections as percentage of total enamel-sealant interface length. Representative samples were evaluated under SEM. Results: Sealants placed on contaminated enamel with no bonding agent showed extensive microleakage (94.27% in SC; 42.65% in SCA). The SEM revealed gaps as wide as 20 μm in areas where silver nitrate leakage could be visualized. In contrast, all bonding agent groups showed leakage less than 6.9%. Placement of sealant with a dentin-bonding agent on contaminated enamel significantly reduced microleakage (P< 0.0001). The use of a bonding agent as an intermediary layer between enamel and sealant significantly reduced saliva's effect on sealant microleakage.
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adhesive agent, bisphenol A bis(2 hydroxypropyl) ether dimethacrylate, Bisphenol A Glycidyl Methacrylate, dentin bonding agent, Dentin Bonding Agents, fissure sealant, polymethacrylic acid derivative, Prime & Bond, resin cement, Scotchbond Dual Cure, single bond, water, analysis of variance, cementation, chemistry, comparative study, enamel, human, molar tooth, pathology, preventive dentistry, saliva, scanning electron microscopy, silver staining, surface property, thermodynamics, time, tooth disease, ultrastructure, Acid Etching, Dental, Adhesives, Analysis of Variance, Bisphenol A-Glycidyl Methacrylate, Comparative Study, Dental Bonding, Dental Enamel, Dental Leakage, Dental Prophylaxis, Dentin-Bonding Agents, Human, Microscopy, Electron, Scanning, Molar, Third, Pit and Fissure Sealants, Polymethacrylic Acids, Resin Cements, Saliva, Silver Staining, Statistics, Support, Non-U.S. Gov't, Surface Properties, Thermodynamics, Time Factors, Water
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Inglês
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American Journal of Dentistry, v. 13, n. 4, p. 187-191, 2000.
