title: Computed online determination of life-long mean index values for carious, extracted, and/or filled permanent teeth.
abstract: OBJECTIVE
  The purpose of this study was to develop and test a data-mining system for the online determination of mean DS, M, and FS or DMFS values per subject at different ages from electronic patient records at two health centers to see if there are north-south differences in oral health in Finland.
  
  
  METHODS
  The mean index values were determined at two health centers using the codes of dental charts and progress notes of electronic dental records during the digital era of more than 10 years in a total of 153,619 subjects of all ages. Extracted teeth, as well as sound, carious, and restored tooth surfaces, were recorded from the dental charts. Treatments were then additionally registered from progress notes of the records when performed.
  
  
  RESULTS
  The cumulative DS and FS values were similar in subjects under the age of 20 years at both health centers. In adults, caries was more abundant in northern Finland, where there was a higher number of restored surfaces (>40) registered, compared to only 30 in southern Finland at the age of 40 years. A high increase in the number of extractions began at age 45 in the north compared to age 70 in the south. These changes were clearly reflected in the DMFS index.
  
  
  CONCLUSIONS
  Online determination of health parameters is a feasible methodology. The results revealed that north-south regional differences in dental health still occur in adults in Finland, but not in subjects younger than 20 years of age.
authors.affiliation: Institute of Dentistry, University of Oulu, Oulu, Finland.
authors.forename: Marjut
authors.initials: M
authors.lastname: Korhonen
authors.forename: Sinikka
authors.initials: S
authors.lastname: Salo
authors.forename: Jorma
authors.initials: J
authors.lastname: Suni
authors.forename: Markku
authors.initials: M
authors.lastname: Larmas
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D004245:DMF Index; D003731:Dental Caries / Q000453:epidemiology*; D003792:Dental Records / Q000706:statistics & numerical data*; D003793:Dental Restoration, Permanent / Q000706:statistics & numerical data*; D004812:Epidemiologic Methods; D005260:Female; D005387:Finland; D006801:Humans; D008297:Male; D016347:Medical Records Systems, Computerized; D008875:Middle Aged; D017678:Sex Distribution; D014081:Tooth Extraction / Q000706:statistics & numerical data