title: Influence of a hydrophobic resin coating on the immediate and 6-month dentin bonding of three universal adhesives.
abstract: OBJECTIVE
  To test the influence of a hydrophobic resin coating (HC) on the immediate (24h) and 6-month (6m) microtensile dentin bond strengths (μTBS) and nanoleakage (NL) of three universal adhesives applied in self-etch (SE) or in etch-and-rinse (ER) mode.
  
  
  METHODS
  Sixty caries-free extracted third molars were assigned to 12 experimental groups resulting from the combination of the factors "adhesive system" (Scotchbond Universal Adhesive [SBU], 3M ESPE; All-Bond Universal [ABU], Bisco Inc.; and G-Bond Plus [GBP], GC Corporation); "adhesive strategy" (SE or ER); "hydrophobic resin coating" [HC] (with or without Heliobond, Ivoclar Vivadent); and "storage time" (24h or 6m). Specimens were prepared for μTBS testing - (24h) half of the beams were immediately tested under tension; and (6m) the other half was stored in distilled water (37°C) for 6m prior to testing. For each tooth, two beams were randomly selected for NL evaluation for both evaluation times. Data were analyzed for each adhesive system using three-way ANOVA and Tukey's post-hoc test (α=0.05).
  
  
  RESULTS
  μTBS: (24h): In SE mode, HC resulted in statistically greater mean μTBS for all adhesives. (6m): When HC was not used the mean μTBS for SBU/ER, ABU/ER, GBP/ER and SBU/SE decreased significantly. NL: (24h): SBU/ER, ABU/ER and GBP/SE resulted in a significant reduction in NL when HC was applied. (6m): No significant reduction was observed for SBU/ER or for SBU/SE regardless of the use of HC.
  
  
  CONCLUSIONS
  The application of a hydrophobic resin coating improved the 24h and the 6m performances of all three adhesives systems in SE mode.
authors.affiliation: Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Madrid, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Sezinando
authors.affiliation: Dentistry Academic Unit, Faculty of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
authors.forename: Issis
authors.initials: I
authors.lastname: Luque-Martinez
authors.affiliation: School of Dentistry, Universidad de Valparaíso, Valparaíso, Chile.
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Muñoz
authors.affiliation: School of Dentistry, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
authors.affiliation: School of Dentistry, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil.
authors.forename: Alessandro D
authors.initials: AD
authors.lastname: Loguercio
authors.affiliation: Department of Restorative Sciences, University of Minnesota, Minneapolis, MN, USA. Electronic address: perdi001@umn.edu.
authors.forename: Jorge
authors.initials: J
authors.lastname: Perdigão
mesh_terms: D000134:Acid Etching, Dental; D000179:Acrylates / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008689:Methacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000179:Acrylates; C074864:All-Bond system; D020099:Coated Materials, Biocompatible; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates; D019279:Resin Cements; C040415:heliobond; C041330:Scotchbond
keywords: Dental bonding; Hydrophobic resin coat; Microtensile bond strength; Nanoleakage; Universal adhesive systems