title: A prospective longitudinal study on periodontal bone height changes in a Swedish population.
abstract: OBJECTIVE
  This investigation was performed to assess longitudinal changes in periodontal bone height in an adult population over a period of 17 years.
  
  
  METHODS
  In 1973, a random sample of 1000 individuals aged 3-70 years in the city of Jönköping, Sweden, was examined clinically and radiographically to assess dental status and treatment needs. Out of the 574 dentate individuals 15-60 years, 433 accepted the invitation and were re-examined in 1989-91, 4 were edentulous and the study therefore finally included 429 dentate individuals. The examination included full mouth plaque and gingivitis scores and bone height measurements on full mouth intra-oral radiographs. All age groups except the youngest had very good oral hygiene with 50% or more having plaque and gingivitis scores below 20%.
  
  
  RESULTS
  From the age of 20, there was a general pattern of bone height reduction over time corresponding to an annual loss of around 0.1 mm. From the age of 30 years, about 80% of the population had one or more sites with bone loss of 10% or more. Very few individuals, about 5%, exhibited an individual mean bone loss of 2 mm or more. 17% had > or =6 such sites indicating destructive periodontal disease. These individuals and sites could not be identified in advance based only on previous disease experience.
authors.affiliation: Department of Periodontology, The Institute for Postgraduate Dental Education, Jönköping, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Hugoson
authors.forename: L
authors.initials: L
authors.lastname: Laurell
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000539:Alveolar Process / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D003773:Dental Plaque / Q000453:epidemiology; D005891:Gingivitis / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D010512:Periodontal Index; D010519:Periodontium / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D011446:Prospective Studies; D016300:Radiography, Bitewing; D013548:Sweden / Q000453:epidemiology; D013997:Time Factors; D014505:Urban Population / Q000706:statistics & numerical data