title: Microbial Flora of Root Canals of Pulpally-infected Teeth: Enterococcus faecalis a Prevalent Species.
abstract: OBJECTIVE
  The aim of this study was to determine the microorganisms prevalent in the necrotic dental pulp and root canals of unsuccessfully treated teeth.
  
  
  METHODS
  The present study was conducted on 150 single-rooted teeth of patients referring to a dental clinic. Sampling was performed by placing a sterile paper point in the canal for 60 s. Bacterial samples were evaluated by a microbiological technique specific for anaerobic species, used for isolation and identification of sampled strains.
  
  
  RESULTS
  From the 150 samples taken, 101 were from necrotic pulps (primary infection) and 49 were from the teeth with an unsuccessful endodontic treatment (secondary infection).
  
  
  CONCLUSIONS
  Enterococcus faecalis was a prevalent species in the failed root canals evaluated.
authors.affiliation: Lecturer, Department of Community Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Esrafil Balaei
authors.initials: EB
authors.lastname: Gajan
authors.forename: Mohammad
authors.initials: M
authors.lastname: Aghazadeh
authors.forename: Rahib
authors.initials: R
authors.lastname: Abashov
authors.forename: Amin
authors.initials: A
authors.lastname: Salem Milani
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Moosavi