title: Dentine sealing provided by smear layer/smear plugs vs. adhesive resins/resin tags.
abstract: The aim of this study was to evaluate the ability of five experimental resins, which ranged from hydrophobic to hydrophilic blends, to seal acid-etched dentine saturated with water or ethanol. The experimental resins (R1, R2, R3, R4, and R5) were evaluated as neat bonding agents (100% resin) or as solutions solvated with absolute ethanol (70% resin/30% ethanol). Fluid conductance was measured at 20 cm H(2)O hydrostatic pressure after sound dentine surfaces were: (i) covered with a smear layer; (ii) acid-etched; or (iii) bonded with neat or solvated resins, which were applied to acid-etched dentine saturated with water or ethanol. In general, the fluid conductance of resin-bonded dentine was significantly higher than that of smear layer-covered dentine. However, when the most hydrophobic neat resins (R1 and R2) were applied to acid-etched dentine saturated with ethanol, the fluid conductance was as low as that produced by smear layers. The fluid conductance of resin-bonded dentine saturated with ethanol was significantly lower than for resin bonded to water-saturated dentine, except for resin R4. Application of more hydrophobic resins may provide better sealing of acid-etched dentine if the substrate is saturated with ethanol instead of with water.
authors: Department of Restorative Dentistry, Dental Materials, University of Campinas, Piracicaba School of Dentistry, Piracicaba, SP, Brazil.
authors: Marcela R
authors: MR
authors: Carrilho
authors: Franklin R
authors: FR
authors: Tay
authors: Jeremy
authors: J
authors: Sword
authors: Adam M
authors: AM
authors: Donnelly
authors: Kelli A
authors: KA
authors: Agee
authors: Yoshihiro
authors: Y
authors: Nishitani
authors: Fernanda T
authors: FT
authors: Sadek
authors: Ricardo M
authors: RM
authors: Carvalho
authors: David H
authors: DH
authors: Pashley
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003804:Dentin / Q000737:chemistry* / Q000648:ultrastructure; D003806:Dentin Permeability; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D016014:Linear Models; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D016369:Smear Layer; D014867:Water
chemical_list: D000180:Acrylic Resins; D010895:Pit and Fissure Sealants; D014867:Water