title: Effect of different concentrations of chlorhexidine on bond strength of primary dentin.
abstract: OBJECTIVE
  The purpose of this study was to assess the effect of different concentrations of chlorhexidine digluconate on the bond strength to primary tooth dentin immediately and after 12 months.
  
  
  METHODS
  Twenty-one sound primary molars were assigned to 3 groups (N=7). The bonding procedure  was performed in control group (A) using 37% phosphoric acid gel (15 seconds), then washed (15 seconds), dried with air (30 seconds), and rehydrated with water. Groups B and C had the rewetting procedure performed, respectively, with 0.5% and 2% chlorhexidine for 30 seconds. The tensile bond  strength was tested immediately (IM) or after storage in artificial saliva for 12 months (12M). Data were evaluated by 2-way repeated measures analysis of variance and Tukey's post-hoc test.
  
  
  RESULTS
  There was no significant reduction in bond strength values when chlorhexidine was used at  concentrations of 0.5% (IM=49.3/2.6 and 12M=32.3/7.9) and 2% (IM=44.0/8.7 and 12M=34.6/5.1). Conversely, a significantreduction in bond strength was observed in the control group (IM=50.8/12.8 and 12M=20.4/3.7).
  
  
  CONCLUSIONS
  The study validates the concept that chlorhexidinesolution, at different  concentrations, may prevent the degradation of the adhesive interface in primary teeth.
authors.affiliation: Universidade Cruzeiro do Sul, São Paulo, Brazil.
authors.forename: Aline Rosler Grings
authors.initials: AR
authors.lastname: Manfro
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
authors.forename: Alessandro Dourado
authors.initials: AD
authors.lastname: Loguercio
authors.forename: José Carlos Pettorossi
authors.initials: JC
authors.lastname: Imparato
authors.forename: Daniela Prócida
authors.initials: DP
authors.lastname: Raggio
mesh_terms: D002710:Chlorhexidine / Q000008:administration & dosage* / Q000494:pharmacology; D001840:Dental Bonding; D003804:Dentin / Q000378:metabolism*; D006801:Humans; D013048:Specimen Handling; D013718:Tensile Strength
chemical_list: D002710:Chlorhexidine