title: Dentin protection by a primer-less adhesive technique.
abstract: OBJECTIVE
  To identify the remaining demineralized dentin (the permeable layer that allows leakage) when using primer-less wet bonding with a total etching period of 10 to 60 seconds compared with contemporary resin adhesives.
  
  
  METHODS
  Extracted human molars were selected and Class V cavities were prepared on the axial surfaces at the CEJ, providing margins in enamel and dentin for leakage testing using a basic dye (n = 10). Seven groups of conditioned teeth [1-1 etched for 10, 30, and 60 seconds (primer-less wet), All-Bond 2 and Single-Bond 2 (wet), AQ-Bond (self-etched), Super-Bond C&B (dry)] were used as bonding systems for resin composite restoration. All specimens were stored in water at 37 degrees C for 24 hours before soaking in a 0.5% basic fuchsin solution for 24 hours. The distance of dye penetration was measured using stereomicroscopy.
  
  
  RESULTS
  No leakage at the enamel- and dentin-resin interfaces was found for all etching periods of 1-1 primer-less, Super-Bond C&B, and AQ-Bond specimens. However, leakage was observed at dentin margins in two wet with primer systems, All-Bond 2 (1.31 +/- 1.39 mm) and Single-Bond 2 (0.37 +/- 0.28 mm), which required phosphoric etching to remove a weak smear layer on prepared dentin.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Patumwon, Bangkok 10330, Thailand. tmorakot@chula.ac.th
authors.forename: Morakot
authors.initials: M
authors.lastname: Piemjai
authors.forename: Onusa
authors.initials: O
authors.lastname: Waleepitackdej
authors.forename: Franklin
authors.initials: F
authors.lastname: García-Godoy
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nakabayashi
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods*; D003763:Dental Leakage / Q000209:etiology / Q000473:pathology / Q000517:prevention & control*; D003804:Dentin / Q000473:pathology; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008963:Molar; D019279:Resin Cements / Q000737:chemistry; D017001:Tooth Demineralization / Q000150:complications*
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements