title: Assessment of possible risk indicators for apical periodontitis in root-filled teeth in an adult Turkish population.
abstract: OBJECTIVE
  The objective of this study was to determine possible independent risk indicators of apical periodontitis (AP) in root-filled teeth in an adult Turkish population.
  
  
  METHODS
  This study included subjects older than 15 years who had 1 or more root-filled teeth examined at the Baskent University Faculty of Dentistry. A total of 812 root-filled teeth were evaluated in 425 individuals. AP was the dependent variable and age, gender, length and density of root fillings, presence of periodontal problems, posts, localization of tooth, and tooth type were identified as independent variables. Generalized Estimating Equation (GEE) models were used in statistical analysis.
  
  
  RESULTS
  AP was detected on 148 teeth (18.2%) in 812 root-filled teeth. According to multiple GEE model, males were more likely to have AP than females. Of the dental variables, length of root fillings, periodontal problems and tooth type were significantly associated with AP.
  
  
  CONCLUSIONS
  The present study indicates that to be male and dental variables including length of root fillings, periodontal problems, and molar teeth were significantly associated with AP.
authors.affiliation: Department of Biostatistics, Faculty of Medicine, Ankara University, Ankara, Turkey.
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Genc
authors.forename: Kamran
authors.initials: K
authors.lastname: Gulsahi
authors.forename: Ayse
authors.initials: A
authors.lastname: Gulsahi
authors.forename: Yalcin
authors.initials: Y
authors.lastname: Yavuz
authors.forename: Aysun
authors.initials: A
authors.lastname: Cetinyurek
authors.forename: Mete
authors.initials: M
authors.lastname: Ungor
authors.forename: Meltem
authors.initials: M
authors.lastname: Col
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D008963:Molar; D010485:Periapical Periodontitis / Q000209:etiology*; D010510:Periodontal Diseases / Q000150:complications; D012307:Risk Factors; D012389:Root Canal Obturation / Q000009:adverse effects*; D012737:Sex Factors; D014421:Turkey; D055815:Young Adult