title: Longitudinal study of periapical and endodontic status in a Danish population.
abstract: OBJECTIVE
  To describe and discuss changes in periapical and endodontic status in a general Danish population.
  
  
  METHODS
  In 1997, 616 randomly selected individuals had a full-mouth radiographic survey taken. In 2003, 77% of the participants attended for a new full-mouth radiographic examination. Information on endodontic treatment and periapical status was obtained. The periapical index (PAI) was used to assess apical periodontitis (AP).
  
  
  RESULTS
  More participants had root filling(s) and AP in 2003 than in 1997. More teeth had AP and/or root fillings in 2003. Fewer of the root-filled teeth (RFT) had AP in 2003. Less than 3% of the teeth without root fillings (NRFT) that in 1997 had no AP, developed AP and/or received a root filling. Of the NRFT which in 1997 had AP, more than 35% still had AP and no root filling in 2003. Approximately, 30% of the NRFT with AP in 1997 received a root filling. Of the teeth that received a root filling, 40% had healed, whereas 60% had not. Approximately, 25% of the NRFT that in 1997 had AP had been extracted. In 1997 there were 618 RFT, 314 of the RFT had no AP in 1997. Almost 20% of the RFT that in 1997 were periapically sound, developed AP. Of the 304 RFT with AP in 1997, approximately 30% had healed, in 60% AP persisted, and 10% were extracted.
  
  
  CONCLUSIONS
  The present study indicates that caution must be exercised when statements on the outcome of root canal treatment are made based on the cross-sectional studies.
authors.affiliation: Department of Oral Radiology, School of Dentistry, Royal Dental College, University of Aarhus, Vennelyst Boulevard, DK-8000 Aarhus C, Denmark. llkirkevang@odont.au.dk
authors.forename: L-L
authors.initials: LL
authors.lastname: Kirkevang
authors.forename: M
authors.initials: M
authors.lastname: Vaeth
authors.forename: P
authors.initials: P
authors.lastname: Hörsted-Bindslev
authors.forename: A
authors.initials: A
authors.lastname: Wenzel
mesh_terms: D000328:Adult; D003718:Denmark / Q000453:epidemiology; D003788:Dental Pulp Diseases / Q000453:epidemiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D010483:Periapical Diseases / Q000453:epidemiology*; D010485:Periapical Periodontitis / Q000453:epidemiology; D015995:Prevalence; D016300:Radiography, Bitewing / Q000706:statistics & numerical data; D011861:Radiography, Dental / Q000706:statistics & numerical data; D019233:Retreatment / Q000706:statistics & numerical data; D012390:Root Canal Therapy / Q000706:statistics & numerical data; D014081:Tooth Extraction / Q000706:statistics & numerical data; D019553:Tooth, Nonvital / Q000453:epidemiology