title: Effect of an additional hydrophilic versus hydrophobic coat on the quality of dentinal sealing provided by two-step etch-and-rinse adhesives.
abstract: OBJECTIVE
  To test the hypothesis that the quality of the dentinal sealing provided by two-step etch-and-rinse adhesives cannot be altered by the addition of an extra layer of the respective adhesive or the application of a more hydrophobic, non-solvated resin.
  
  
  METHODS
  full-crown preparations were acid-etched with phosphoric acid for 15 s and bonded with Adper Single Bond (3M ESPE), Excite DSC (Ivoclar/Vivadent) or Prime & Bond NT (Dentsply). The adhesives were used according to the manufacturers' instructions (control groups) or after application to dentin they were a) covered with an extra coat of each respective system or b) coated with a non-solvated bonding agent (Adper Scotchbond Multi-Purpose Adhesive, 3M ESPE). Fluid flow rate was measured before and after dentin surfaces were acid-etched and bonded with adhesives.
  
  
  RESULTS
  None of the adhesives or experimental treatments was capable to block completely the fluid transudation across the treated dentin. Application of an extra coat of the adhesive did not reduce the fluid flow rate of adhesive-bonded dentin (p>0.05). Conversely, the application of a more hydrophobic non-solvated resin resulted in significant reductions in the fluid flow rate (p<0.05) for all tested adhesives.
  
  
  CONCLUSIONS
  The quality of the dentinal sealing provided by etch-and-rinse adhesives can be significantly improved by the application of a more hydrophobic, non-solvated bonding agent.
authors.affiliation: Department of Restorative Dentistry and Dental Materials, Dental School of Piracicaba, University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Safira Marques
authors.initials: SM
authors.lastname: de Andrade e Silva
authors.forename: Marcela Rocha de Oliveira
authors.initials: MR
authors.lastname: Carrilho
authors.forename: Luiz
authors.initials: L
authors.lastname: Marquezini Junior
authors.forename: Fernanda Cristina Pimentel
authors.initials: FC
authors.lastname: Garcia
authors.forename: Adriana Pigozzo
authors.initials: AP
authors.lastname: Manso
authors.forename: Marcelo Corrêa
authors.initials: MC
authors.lastname: Alves
authors.forename: Ricardo Marins
authors.initials: RM
authors.lastname: de Carvalho
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000269:Adhesives / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control*; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D006874:Hydrostatic Pressure; D008964:Molar, Third; D019279:Resin Cements / Q000737:chemistry; D019228:Tooth Crown; D017155:Wettability
chemical_list: D000269:Adhesives; D017220:Dentin-Bonding Agents; D019279:Resin Cements