title: Influence of chlorhexidine and ethanol on the bond strength and durability of the adhesion of the fiber posts to root dentin using a total etching adhesive system.
abstract: BACKGROUND
  The aim of this study was to investigate the effects of pretreatment of gel chlorhexidine (CHX) and ethanol (EtOH) on the bond strength and durability of the adhesion of the fiber post relined with resin composite to the root dentin using a total etch adhesive system.
  
  
  METHODS
  Forty bovine incisor roots were divided into four groups after phosphoric acid etching: irrigation with physiologic solution (control), 5 minutes with CHX, 1 minute with EtOH, and 5 minutes with chlorhexidine followed by 1 minute with EtOH. Fiber posts relined with resin composite were cemented with either RelyX ARC (3M ESPE, St Paul, MN) and a total etch adhesive system Scotchbond Multi-Purpose (3M ESPE). Each group was randomly divided into two subgroups: 24 hours of storage and 12 months of storage. All roots were sectioned transversely, and the push-out test was performed. Failure modes were observed, and the bond strength means were analyzed by analysis of variance and the Tukey test (α = 0.05).
  
  
  RESULTS
  CHX irrigation resulted in homogeneous bond strength values at 24 hours and 12 months of storage (P < .05). A significant bond strength decrease was noticed after 12 months of storage when irrigations were performed with physiologic solution and EtOH application only or associated with CHX (P < .05).
  
  
  CONCLUSIONS
  The use of CHX pretreatment could preserve the bond strength of the fiber post relined with resin composite to root dentin for 12 months. The use of EtOH and CHX followed by EtOH did not preserve the bond strength of the total etch adhesive system Scotchbond Multi-Purpose.
authors.affiliation: Endodontics, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil. dgscecchin@yahoo.com.br
authors.forename: Doglas
authors.initials: D
authors.lastname: Cecchin
authors.forename: José Flávio Affonso
authors.initials: JF
authors.lastname: de Almeida
authors.forename: Brenda P F A
authors.initials: BP
authors.lastname: Gomes
authors.forename: Alexandre Augusto
authors.initials: AA
authors.lastname: Zaia
authors.forename: Caio Cesar Randi
authors.initials: CC
authors.lastname: Ferraz
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate; D002417:Cattle; D002710:Chlorhexidine; D003188:Composite Resins; D001840:Dental Bonding / Q000379:methods; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D000431:Ethanol; D005898:Glass; D057927:Hydrophobic and Hydrophilic Interactions; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D011176:Post and Core Technique; D019279:Resin Cements; D012388:Root Canal Irrigants
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; D012388:Root Canal Irrigants; C084018:Scotchbond Multi-Purpose; C009753:fiberglass; D000431:Ethanol; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D002710:Chlorhexidine