title: Trends over 30 years, 1973-2003, in the prevalence and severity of periodontal disease.
abstract: OBJECTIVE
  The present investigation presents findings of the prevalence and distribution of gingivitis and periodontitis in a Swedish population over the 30 years 1973-2003.
  
  
  METHODS
  Four cross-sectional epidemiological studies in 1973, 1983, 1993, and 2003 were performed in Jönköping, Sweden. Random samples of individuals aged 20, 30, 40, 50, 60, 70, and 80 years were examined clinically and radiographically. Diagnostic criteria were edentulousness, number of teeth, plaque, gingival status, probing pocket depth, gingival recession, alveolar bone level, and classification according to periodontal disease status.
  
  
  RESULTS
  In all age groups, the number of edentulous individuals decreased dramatically and the number of teeth increased. Oral hygiene improved considerably. Over the 30 years, the proportion of periodontally healthy individuals increased from 8% in 1973 to 44% in 2003 and the proportion of individuals with gingivitis and moderate periodontitis decreased. There was a non-significant trend for the proportion of individuals with severe periodontal disease experience (Group 4) to decrease, while the proportion of individuals with advanced periodontitis (Group 5) remained unchanged.
  
  
  CONCLUSIONS
  Oral hygiene and periodontal health improved significantly in the 20-80-year age groups over the 30 years 1973-2003.
authors.affiliation: Department of Natural Science and Biomedicine, School of Health Science, Jönköping University, Jönköping, Sweden. anders.hugoson@hhj.hj.se
authors.forename: Anders
authors.initials: A
authors.lastname: Hugoson
authors.forename: Bengt
authors.initials: B
authors.lastname: Sjödin
authors.forename: Ola
authors.initials: O
authors.lastname: Norderyd
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D003430:Cross-Sectional Studies; D006801:Humans; D008875:Middle Aged; D009066:Mouth, Edentulous / Q000453:epidemiology*; D009910:Oral Hygiene / Q000639:trends*; D010510:Periodontal Diseases / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology*; D010517:Periodontics / Q000639:trends*; D015995:Prevalence; D012494:Sampling Studies; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D013548:Sweden / Q000453:epidemiology