title: Exposed collagen in resin bonds to caries-affected dentin after dentin treatment with aqueous and alcoholic chlorhexidine solutions.
abstract: OBJECTIVE
  To evaluate the effect of saturation of demineralized dentin with aqueous and alcoholic excipients of chlorhexidine (CHX) on the exposure of collagen fibrils in resin-dentin bonds in sound and caries-affected dentin.
  
  
  METHODS
  Flat midcoronal dentin surfaces were prepared from 24 noncarious molars, and artificial caries was induced in half of the sample. For each substrate, the surfaces were assigned to 4 groups (n = 3) according to the saturation solution of the dentin: water, ethanol, 1% CHX aqueous or alcoholic solution. Infected dentin was removed by abrasive papers. After acid etching, the dentin surface was saturated with each solution for 60 s followed by application of Single Bond. The specimens were processed for Goldner's trichrome staining and the thickness of the exposed collagen zone (ECZ) at the resin/dentin interfaces was measured under optical microscopy. Data were analyzed statistically by Kruskal-Wallis and Mann-Whitney tests (α = 0.05).
  
  
  RESULTS
  Regardless of the saturation solution, caries-affected dentin presented a thicker ECZ at the bottom of the hybrid layer than did sound dentin. For both substrates, 100% ethanol had a negative influence on collagen exposure in comparison with water, but the same was not observed for the CHX alcoholic solution. CHX solutions did not differ significantly from each other or from their respective solvents.
  
  
  CONCLUSIONS
  The saturation of phosphoric acid-demineralized dentin with either CHX aqueous or alcoholic solutions did not affect the exposure of collagen fibrils in the resin-dentin bonds produced in sound and caries-affected dentin. A thicker zone of exposed collagen was found in hybridized caries-affected dentin compared to noncarious dentin.
authors.forename: Hérica Adad
authors.initials: HA
authors.lastname: Ricci
authors.forename: Débora Lopes
authors.initials: DL
authors.lastname: Scheffel
authors.forename: Matheus Racy
authors.initials: MR
authors.lastname: Mariusso
authors.forename: Denise Madalena
authors.initials: DM
authors.lastname: Spolidorio
authors.forename: Carlos Alberto
authors.initials: CA
authors.lastname: de Souza Costa
authors.forename: Josimeri
authors.initials: J
authors.lastname: Hebling
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D001391:Azo Compounds; D002710:Chlorhexidine / Q000737:chemistry*; D003094:Collagen / Q000648:ultrastructure*; D004396:Coloring Agents; D001840:Dental Bonding; D003731:Dental Caries / Q000473:pathology*; D003738:Dental Cements / Q000737:chemistry; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004801:Eosine Yellowish-(YS); D000431:Ethanol / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008739:Methyl Green; D010756:Phosphoric Acids / Q000737:chemistry; D016369:Smear Layer; D012997:Solvents / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: C554641:Adper single bond 2; D001391:Azo Compounds; D004396:Coloring Agents; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D012997:Solvents; C017768:trichrome stain; D014867:Water; D000431:Ethanol; D008739:Methyl Green; D003094:Collagen; C030242:phosphoric acid; D002710:Chlorhexidine; D004801:Eosine Yellowish-(YS)