Use of one-bottle adhesive as an intermediate bonding layer to reduce sealant microleakage on saliva-contaminated enamel
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Abstract
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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English
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American Journal of Dentistry, v. 13, n. 4, p. 187-191, 2000.
