title: Effect of cleaning methods on bond strength of self-etching adhesive to dentin.
abstract: OBJECTIVE
  The aim of this study was to investigate the influence of cleaning methods to remove zinc oxide-eugenol-based root canal sealer (Endomethasone) on the bond strength of the self-etching adhesive to dentin.
  
  
  METHODS
  Twenty crowns of bovine incisors were cut to expose the pulp chamber. A zinc oxide- and eugenol-based sealer was placed for 10 min in contact with the pulp chamber dentin. Specimens were divided into four groups according to the cleaning method of dentin used: G1, no root canal sealer (control); G2, 0.9% sodium chlorite (NaCl); G3, ethanol; and G4, followed by diamond drill. After cleaning, the teeth were restored with composite resin and Clearfil SE Bond. All specimens were sectioned to produce rectangular sticks and dentin/resin interface was submitted to microtensile bond testing. The mean bond strengths were analyzed using ANOVA/Tukey (α = 0.05).
  
  
  RESULTS
  G3 and G4 showed bond strengths similar to the G1 (P > 0.05). A significant decrease in the bond strength in the G2 was observed (P < 0.05). G1, G3, and G4, the predominant failure mode was the mixed type. The prevalence of adhesive failure mode was verified in the G2.
  
  
  CONCLUSIONS
  The cleaning methods affected the bond strength of the self-etching adhesive to dentin differently.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Juliana Delatorre
authors.initials: JD
authors.lastname: Bronzato
authors.affiliation: Department of Restorative Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil.
authors.forename: Doglas
authors.initials: D
authors.lastname: Cecchin
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Daniela Cristina
authors.initials: DC
authors.lastname: Miyagaki
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: José Flávio Affonso
authors.initials: JF
authors.lastname: de Almeida
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
authors.forename: Caio Cezar Randi
authors.initials: CC
authors.lastname: Ferraz
keywords: Composite resins; dentin bonding agents; endodontics