Dentine sealing provided by smear layer/smear plugs vs. adhesive resins/resin tags.
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.
Carrilho
Marcela R
MR
Department of Restorative Dentistry, Dental Materials, University of Campinas, Piracicaba School of Dentistry, Piracicaba, SP, Brazil.
Tay
Franklin R
FR
Sword
Jeremy
J
Donnelly
Adam M
AM
Agee
Kelli A
KA
Nishitani
Yoshihiro
Y
Sadek
Fernanda T
FT
Carvalho
Ricardo M
RM
Pashley
David H
DH
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
D000180:Acrylic Resins; D010895:Pit and Fissure Sealants; D014867:Water