title: Prevalence of apical periodontitis and factors associated with the periradicular status.
abstract: OBJECTIVE
  The present study aimed at assessing the prevalence of apical periodontitis and identifying the factors associated with apical periodontitis, particularly the influence of the quality of root canal fillings and coronal restorations on the periradicular status.
  
  
  METHODS
  The study population consisted of adult patients, men and women, seeking routine dental care at the Endodontic Clinic in the school teaching hospital between September 2006 and July 2008. For each patient complete oral examination and periapical radiographs were made for pathological teeth. All teeth were assessed individually. AP was diagnosed according to defined criteria, other variables were root fillings, coronal fillings, trauma and caries. The odds ratio and 95% confidence interval were used to calculate the risk of apical periodontitis related to tooth-specific risk indicators on the presence of apical periodontitis. A multiple logistic regression model to control for confounders and to determine their independent association with apical periodontitis was used also.
  
  
  RESULTS
  AP was detected on teeth (63.79%). The prevalence of apical periodontitis in root canal-treated teeth was 39.5%. Of the dental variables caries, trauma, inadequate root fillings and inadequate restoration were significantly associated with AP.
  
  
  CONCLUSIONS
  The prevalence of AP in this study group was higher than in other populations. The probability of AP increased significantly after root canal treatment and coronal filling and was closely associated with the quality of the filling.
authors.affiliation: Department of Endodontics and Restorative Dentistry, Faculty of Dentistry, University Mohammed V Souissi Rabat, Morocco. dr_chala@yahoo.fr
authors.forename: Sanaa
authors.initials: S
authors.lastname: Chala
authors.forename: Redouane
authors.initials: R
authors.lastname: Abouqal
authors.forename: Faïza
authors.initials: F
authors.lastname: Abdallaoui
mesh_terms: D000328:Adult; D003731:Dental Caries / Q000453:epidemiology; D018772:Dental Marginal Adaptation / Q000592:standards; D003793:Dental Restoration, Permanent / Q000592:standards / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D009018:Morocco / Q000453:epidemiology; D010485:Periapical Periodontitis / Q000453:epidemiology*; D015995:Prevalence; D011671:Pulpitis / Q000453:epidemiology; D016300:Radiography, Bitewing / Q000706:statistics & numerical data; D012307:Risk Factors; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000592:standards; D012390:Root Canal Therapy / Q000592:standards / Q000706:statistics & numerical data; D018677:Tooth Injuries / Q000453:epidemiology; D019553:Tooth, Nonvital / Q000453:epidemiology; D014504:Urban Health / Q000706:statistics & numerical data
chemical_list: D012387:Root Canal Filling Materials