title: Prevalence of intrabony defects in a Swedish adult population. A radiographic epidemiological study.
abstract: OBJECTIVE
  The purpose of this radiographic study was to evaluate the prevalence of intrabony defects and to study the correlation between these defects and clinical variables in a Swedish adult population. Another aim was to study the combined relationship of intrabony defects and furcation involvement with clinical variables.
  
  
  METHODS
  The present study was performed using bitewing and apical radiographs from 329 subjects. The clinical and radiographic data were collected from the study that was carried out in Jönköping 2003. Intrabony defects were measured from the bottom of the pocket to the highest point of alveolar bone crest. Furcations were considered healthy if the furcation was filled with bone up to the fornix. SPSS was used to analyze the results.
  
  
  RESULTS
  2014 molars and 5898 non-molars were included in the study. The prevalence of intrabony defects was 2.2% in the whole population. Multivariate analysis showed that periodontal pockets (p < 0.0001), plaque (p < 0.001), age (p < 0.02) and gender (p < 0.03) had a significant relationship with the occurrence of intrabony defects. On the other hand, gingivitis, smoking habits and education level were not associated with intrabony defects. Multivariate analysis showed that the only variable associated with presence of intrabony defects and furcation involvement was presence of periodontal pockets (p < 0.0001). Whilst, gingivitis, education level, plaque, gender, age and smoking habits were not associated with the outcome.
  
  
  CONCLUSIONS
  Mandibular second molars were most likely to display intrabony defects, whilst mandibular incisors were the least likely to do so.
authors.affiliation: a Department of Periodontology , The Institute for Postgraduate Dental Education , Jönköping , Sweden.
authors.forename: Uday
authors.initials: U
authors.lastname: Najim
authors.affiliation: a Department of Periodontology , The Institute for Postgraduate Dental Education , Jönköping , Sweden.|b Faculty of Odontology , Malmö University , Malmö , Sweden.
authors.forename: Ola
authors.initials: O
authors.lastname: Norderyd
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging* / Q000453:epidemiology* / Q000601:surgery; D016021:Epidemiologic Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010510:Periodontal Diseases / Q000000981:diagnostic imaging* / Q000453:epidemiology* / Q000601:surgery; D010512:Periodontal Index; D015995:Prevalence; D013548:Sweden / Q000453:epidemiology
keywords: Prevalence; intrabony defects; periodontitis; tooth furcation