Dentine sealing provided by smear layer/smear plugs vs. adhesive resins/resin tags |
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Authors: | Carrilho Marcela R Tay Franklin R Sword Jeremy Donnelly Adam M Agee Kelli A Nishitani Yoshihiro Sadek Fernanda T Carvalho Ricardo M Pashley David H |
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Affiliation: | Department of Restorative Dentistry, Dental Materials, University of Campinas, Piracicaba School of Dentistry, Piracicaba, SP, Brazil. |
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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. |
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Keywords: | dentine permeability dentine sealing ethanol-saturated dentine resin permeability smear layer |
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