title: Comparison of different dentin pretreatment protocols on the bond strength of glass fiber post using self-etching adhesive.
abstract: BACKGROUND
  This study compared the influence of different irrigants with and without ultrasound or laser irradiation on the bond strength of glass fiber posts using a self-etching adhesive in a supplementary dentin pretreatment.
  
  
  METHODS
  Ninety bovine incisor roots were divided into 3 groups according to the irrigant tested: 2% chlorhexidine (CHX) (n = 30); 2.5% sodium hypochlorite (NaOCl) (n = 30), and saline solution (control) (n = 30). Each group was randomly divided into 3 subgroups according to the supplementary dentin pretreatment: ultrasound, Nd:YAG laser, and nonsupplemented (control). A self-etching adhesive system (Futurabond DC; VOCO GmbH, Cuxhaven, Germany) was used, and the glass fiber posts were cemented with dual-cure epoxy-based luting agent (Bifix QM, VOCO GmbH). All roots were sectioned transversely, and the push-out test was performed. Failure mode analysis was also evaluated.
  
  
  RESULTS
  Bond strength decreased significantly after the use of 2.5% NaOCl in all root thirds (P < .05). CHX showed no difference in the mean bond strength value compared with saline solution (P > .05). The supplementary dentin pretreatment using the Nd:YAG laser or ultrasound did not improve the bond strength values for both NaOCl and CHX (P > .05). Moreover, the apical third exhibited the lowest mean bond strength values (P < .05). Analysis indicated that the predominant failure mode was the mixed type.
  
  
  CONCLUSIONS
  Regardless of the irrigant used, the supplementary dentin pretreatment with ultrasound or laser irradiation showed no improvement in bond strength. Also, the use of NaOCl decreased the bond strength of glass fiber posts using a self-etching adhesive system, whereas CHX preserved it.
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil. Electronic address: Frederico.martinho@fosjc.unesp.br.
authors.forename: Frederico C
authors.initials: FC
authors.lastname: Martinho
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Claudio Antonio Talge
authors.initials: CA
authors.lastname: Carvalho
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Luciane D
authors.initials: LD
authors.lastname: Oliveira
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Ana Júlia Farias
authors.initials: AJ
authors.lastname: de Lacerda
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Ana Cláudia Carvalho
authors.initials: AC
authors.lastname: Xavier
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Marina Gullo
authors.initials: MG
authors.lastname: Augusto
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Rayssa Ferreira
authors.initials: RF
authors.lastname: Zanatta
authors.affiliation: Endodontic Division, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, São Paulo, Brazil.
authors.forename: Cesar Rogerio
authors.initials: CR
authors.lastname: Pucci
mesh_terms: D000818:Animals; D002417:Cattle; D002710:Chlorhexidine / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003737:Dental Cavity Preparation / Q000379:methods; D003786:Dental Pulp Cavity; D003804:Dentin / Q000737:chemistry* / Q000000981:diagnostic imaging; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000494:pharmacology; D004708:Endodontics / Q000379:methods; D005898:Glass / Q000737:chemistry*; D007180:Incisor; D028022:Low-Level Light Therapy / Q000379:methods; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D012388:Root Canal Irrigants / Q000737:chemistry* / Q000494:pharmacology; D012965:Sodium Chloride / Q000737:chemistry; D012973:Sodium Hypochlorite / Q000737:chemistry; D014092:Tooth Root; D000069453:Ultrasonic Waves
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012388:Root Canal Irrigants; C009753:fiberglass; D012965:Sodium Chloride; D012973:Sodium Hypochlorite; D002710:Chlorhexidine
keywords: Chlorhexidine; endodontics; irrigants; lasers; sodium hypochlorite