title: Caries experience in 7-, 12-, and 15-year-old schoolchildren in the canton of Basel-Landschaft, Switzerland, from 1992 to 2011.
abstract: OBJECTIVE
  To investigate the changes in caries experience and prevalence among schoolchildren of the canton of Basel-Landschaft, Switzerland, over the course of 20 years.
  
  
  METHODS
  A random sample of either schoolchildren aged 7, 12, and 15 years (in 1992) or aged 12 and 15 years (in 1997) or their respective school classes (2001, 2006 and 2011) was selected so that approximately 10% of schoolchildren could be examined. The children's dmft and DMFT scores were determined according to the WHO methodology and analyzed using cluster-adjusted ordinary multiple linear regression modeling.
  
  
  RESULTS
  For all age groups, the respective dmft/DMFT values decreased steadily from 1992 to 2006 but increased again in 2011. However, the observed differences were not statistically significant over the examination years from 2001 to 2011. Schoolchildren with a migrant background had approximately two- to threefold higher dmft/DMFT values.
  
  
  CONCLUSIONS
  In the years from 1992 to 2001, a steady decline in caries was observed in all age groups of schoolchildren examined in the canton of Basel-Landschaft. However, in the subsequent 10 years, this decline has leveled off. The mean dmft/DMFT values are comparable to those in other parts of Switzerland. Migrants are a caries-risk group; the mean dmft/DMFT values were higher in schoolchildren with a migrant background than in the comparable Swiss children.
authors.affiliation: Department for Preventive Dentistry and Oral Microbiology, School of Dental Medicine, University of Basel, Basel, Switzerland.
authors.forename: Tuomas
authors.initials: T
authors.lastname: Waltimo
authors.affiliation: Clinic for Preventive Dentistry, Periodontology and Cariology, Center for Dental Medicine, University of Zurich, Zurich, Switzerland.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Menghini
authors.affiliation: Department for Preventive Dentistry and Oral Microbiology, School of Dental Medicine, University of Basel, Basel, Switzerland.
authors.forename: Catherine
authors.initials: C
authors.lastname: Weber
authors.affiliation: Department for Preventive Dentistry and Oral Microbiology, School of Dental Medicine, University of Basel, Basel, Switzerland.
authors.forename: Eva M
authors.initials: EM
authors.lastname: Kulik
authors.affiliation: Department of Health and Economics, Canton of Basel-Landschaft, Liestal, Switzerland.
authors.forename: Samuel
authors.initials: S
authors.lastname: Schild
authors.affiliation: Department for Preventive Dentistry and Oral Microbiology, School of Dental Medicine, University of Basel, Basel, Switzerland.
authors.forename: Jürg
authors.initials: J
authors.lastname: Meyer
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D004245:DMF Index; D003731:Dental Caries / Q000453:epidemiology*; D054242:Emigrants and Immigrants / Q000706:statistics & numerical data; D006801:Humans; D015995:Prevalence; D013557:Switzerland / Q000453:epidemiology
keywords: DMFT/dmft; caries experience; epidemiology