title: Influence of calcium hydroxide dressing and two irrigants on the filling of artificial lateral canals.
abstract: BACKGROUND
  This study was carried out on the assumption that calcium hydroxide [Ca(OH) 2 ] dressing and irrigants may influence the obturation of lateral canals.
  
  
  OBJECTIVE
  To evaluate the influence of 2.5% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX) gel and Ca(OH) 2 on the filling of artificial lateral canals.
  
  
  METHODS
  Ex vivo quantitative laboratory study.
  
  
  METHODS
  Forty-two human mandibular premolars were selected. After cavity access, six lateral canals were performed, two in each root section, one mesial and one on the distal root surface. After preparation, the specimens were randomly divided into four groups: Group I: Under irrigation with 2% CHX and saline solution and with intracanal dressing Ca(OH) 2 paste; Group II: The same preparation as Group I, but without Ca(OH) 2 ; Group III: Under irrigation with 2.5% NaOCl without Ca(OH) 2 ; and Group IV: The same preparation as Group III, but with Ca(OH) 2 . Two teeth without intracanal dressing were used as negative controls. Lateral condensation technique was performed. Then, digital radiographic images were obtained.
  
  
  METHODS
  Data were analyzed using SPSS 17.0, submitted to Kappa (reliability between examiners) and Kruskal-Wallis test.
  
  
  RESULTS
  No statistical difference was registered between Groups II and III in all root sections (P > 0.05), but it was observed between Groups I and IV (P < 0.05), except on the apical section (P > 0.05). In all sections, the Group I filled more artificial lateral canals than in Group IV.
  
  
  CONCLUSIONS
  The irrigants tested had no influence on the filling of artificial lateral canals. Nevertheless, intracanal dressing of Ca(OH) 2 influenced this filling.
authors.affiliation: Department of Restorative Dentistry and Endodontics, Federal University of Paraná, Curitiba, Brazil.
authors.forename: Marili Doro Andrade
authors.initials: MD
authors.lastname: Deonizio
authors.forename: Betânia Drummond Duarte
authors.initials: BD
authors.lastname: Teixeira
authors.forename: Marilisa Carneiro Leão
authors.initials: MC
authors.lastname: Gabardo
authors.forename: Antonio
authors.initials: A
authors.lastname: Batista
authors.forename: Alexandre
authors.initials: A
authors.lastname: Kowalczuck
authors.forename: Gilson Blitzkow
authors.initials: GB
authors.lastname: Sydney
mesh_terms: D001641:Bicuspid; D002126:Calcium Hydroxide / Q000737:chemistry*; D002710:Chlorhexidine / Q000737:chemistry*; D003786:Dental Pulp Cavity; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012388:Root Canal Irrigants / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods*; D018915:Root Canal Preparation / Q000379:methods; D012973:Sodium Hypochlorite / Q000737:chemistry*
chemical_list: D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite; D002126:Calcium Hydroxide; D002710:Chlorhexidine