title: Effect of different bonding strategies on adhesion to deep and superficial permanent dentin.
abstract: OBJECTIVE
  To evaluate the effect of different bonding strategies on the microtensile bond strength to deep and superficial permanent dentin.
  
  
  METHODS
  Forty-eight teeth were randomly flattened according to the dentin depth: superficial dentin (SD) and deep dentin (DD). Subsequently, three adhesive systems were applied (n=8): an etch-and-rinse (Adper Single Bond 2 - SB), a "mild" two-step self-etching (Clearfil SE Bond - SE) and a one-step self-etching adhesive system (Futurabond - FB). Each specimen was restored with a composite resin and sectioned into 1.0-mm(2) thick slabs. After 24 hours, resin-dentin sticks were submitted to tensile stress in a universal testing machine (0.5 mm/min). Data were submitted to two-way ANOVA and Tukey's test at a level of 0.05%.
  
  
  RESULTS
  Superficial dentin showed the highest microtensile bond strength values, which differed statistically from those obtained in the deep dentin, irrespective of the adhesive system used. FB yielded the highest bond strength values, which were statistically similar to the bond strength values of SE, but statistically different from those obtained when the SB adhesive was used.
  
  
  CONCLUSIONS
  Bond strength obtained in superficial dentin was significantly higher than in deep dentin, for all adhesive systems tested. Adhesion was affected by the different bonding strategies: the one-step, low pH, acetone-based self-etching adhesive promoted the higher bond strength values, which were statistically similar to those obtained with the two-step, water-based self-etching adhesive.
authors.affiliation: DDS, Faculdade de Odontologia e Centro de Pesquisas Odontológicas São Leopoldo Mandic, Campinas, São Paulo, Brazil.
authors.forename: Rafael Eduardo Fernandes
authors.initials: RE
authors.lastname: Pegado
authors.forename: Flávia Lucisano Botelho
authors.initials: FL
authors.lastname: do Amaral
authors.forename: Flávia Martão
authors.initials: FM
authors.lastname: Flório
authors.forename: Roberta Tarkany
authors.initials: RT
authors.lastname: Basting
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