title: The effect of double-coating and times on the immediate and 6-month dentin bonding of universal adhesives.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the effect of double-application coats and times on microtensile bond strength (μTBS) and adhesive-dentin interfaces created by dentin adhesive systems after 6 months of storage in water.
  
  
  METHODS
  Two-hundred sixteen extracted non-carious human third molars were selected for the study. Single-Bond Universal (SU) and All-Bond Universal (AU), Adper Easy One (Eo) Self-Etch adhesive and Adper Single-Bond 2 (Sb) etch-and-rinse adhesive were applied to a flat dentin surface using three methods (1): dentin adhesives were applied as recommended by the manufacturers; (2): two consecutive coats of dentin adhesives were applied before photo-polymerization; and (3): a single coat of adhesive was applied but with twice the manufacturers recommended application time. Microtensile bond strength was determined either immediately or after 6 months of water storage. Data were analyzed using one-way analysis of variance and Tukey's post-hoc tests.
  
  
  RESULTS
  At 24 h, groups 1, 2, and 3 exhibited statistically similar results for all dentin adhesive systems. For AU-Er, group 3 showed significantly higher bond strength than all group of AU-Se after 6 months.
  
  
  CONCLUSIONS
  Universal adhesives seemed more stable against water degradation than traditional two-step etch-and-rinse and all-in-one systems within the 6-month period.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Istanbul University, Turkey.
authors.forename: Diial
authors.initials: D
authors.lastname: Pashaev
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Istanbul University, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Demirci
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Kocaeli University, Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Tekçe
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Istanbul University, Turkey.
authors.forename: Safa
authors.initials: S
authors.lastname: Tuncer
authors.affiliation: Department of Biostatistcis and Medical Informatics, Kocaeli University Faculty of Medicine, Turkey.
authors.forename: Canan
authors.initials: C
authors.lastname: Baydemir
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third / Q000737:chemistry; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013718:Tensile Strength; D014867:Water / Q000737:chemistry
chemical_list: D000269:Adhesives; C000612360:Adper Easy One; C554641:Adper single bond 2; D020099:Coated Materials, Biocompatible; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C115612:single bond; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate
keywords: Bond durability; double-application coat; double-application time; universal adhesive