title: Tooth-related risk factors for periodontal disease in community-dwelling elderly people.
abstract: OBJECTIVE
  While most previous epidemiological studies have focused on subject-level risk factors for periodontal destruction, tooth-related factors have not been fully explored. The purpose of this study was to evaluate both tooth-related and subject-related factors affecting periodontal disease progression using a two-level multilevel model.
  
  
  METHODS
  A longitudinal survey over a period of 10 years was carried out on 286 community-dwelling elderly subjects aged 70 years at baseline. Clinical attachment level (CAL) was measured at six sites per tooth on all teeth present and periodontal disease progression was defined as CAL> or =3 mm.
  
  
  RESULTS
  Periodontal disease progression was found in 79% of the subjects and most frequently in maxillary molars. Multilevel logistic regressions revealed that subjects wearing removable dentures were significantly at risk for periodontal disease progression. Abutment teeth for removable/fixed dentures were also significantly more likely to suffer periodontal breakdown. Furthermore, the following tooth-related variables were found to be possible risk factors for periodontal disease progression: maxillary and multirooted teeth.
  
  
  CONCLUSIONS
  Multirooted teeth and abutments for a fixed denture were possible risk factors for periodontal disease progression.
authors.affiliation: Department of Oral Health Science, Niigata University, Niigata City, Niigata, Japan. hirotomi@dent.niigata-u.ac.jp
authors.forename: Toshinobu
authors.initials: T
authors.lastname: Hirotomi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Yoshihara
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ogawa
authors.forename: Hideo
authors.initials: H
authors.lastname: Miyazaki
mesh_terms: D000368:Aged; D003442:Crowns / Q000706:statistics & numerical data; D000044:Dental Abutments / Q000706:statistics & numerical data; D003729:Dental Care / Q000706:statistics & numerical data; D003742:Dental Devices, Home Care / Q000706:statistics & numerical data; D003828:Denture, Overlay / Q000706:statistics & numerical data; D003830:Denture, Partial, Fixed / Q000706:statistics & numerical data; D003832:Denture, Partial, Removable / Q000706:statistics & numerical data; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008137:Longitudinal Studies; D008297:Male; D008437:Maxilla; D008963:Molar / Q000473:pathology; D017622:Periodontal Attachment Loss / Q000453:epidemiology; D010510:Periodontal Diseases / Q000453:epidemiology*; D010514:Periodontal Pocket / Q000453:epidemiology; D012111:Residence Characteristics; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology; D014070:Tooth / Q000473:pathology*; D016388:Tooth Loss / Q000453:epidemiology