title: Prevalence of enamel fluorosis in 12-year-olds in two Swiss cantons.
abstract: The neighbouring cantons Basel-Stadt and Basel-Landschaft had introduced different fluoridation schemes for caries prevention: Basel-Stadt provided drinking water fluoridated at 0.8-1 ppm F since 1962, while Basel-Landschaft introduced fluoridated domestic salt (250 ppm F since 1983). Representative samples of 12-year-old schoolchildren (6th-graders) were studied to evaluate the prevalence of (I) dental fluorosis (FOP) using the Thylstrup-Fejerskov (TF) index, (II) non fluoride-associated enamel opacities (non-FOP), and (III) hypoplasia of the incisors. Standardised frontal colour photographs were taken and assessed by four examiners after projection. Of 373 schoolchildren studied in 1999 in Basel-Stadt 119 (31.9%) showed fluoride-associated enamel opacities, i. e. 66 (17.7%) a very mild form (TF score 1), 47 (12.6%) a mild form (TF score 2), five scored TF3 and one TF5. In addition, non-FOP were diagnosed in 115 (30.8%) and hypoplasia in 47 (12.6%) children. Among the 448 children evaluated in 2001 in Basel-Landschaft 143 (31.9%) showed FOP, namely 74 (16.5%) scored TF1, 54 (12.2%) scored TF2, 12 (2.7%) scored TF3, and three (0.7%) scored TF5. Non-FOP were found among 93 (20.8%) and hypoplasia among 56 (12.5%) children. Thus, in spite of different fluoridation schemes in the two cantons, the prevalences of FOP were identical. Most fluoride-associated enamel opacities were mild or very mild. They did not represent an aesthetic problem and certainly not a public health concern.
authors.affiliation: Institute of Preventive Dentistry and Oral Microbiology, University of Basel, Dental School, Basel, Switzerland.
authors.forename: Kathrin
authors.initials: K
authors.lastname: Büchel
authors.forename: Patric
authors.initials: P
authors.lastname: Gerwig
authors.forename: Catherine
authors.initials: C
authors.lastname: Weber
authors.forename: Peter
authors.initials: P
authors.lastname: Minnig
authors.forename: Peter
authors.initials: P
authors.lastname: Wiehl
authors.forename: Samuel
authors.initials: S
authors.lastname: Schild
authors.forename: Jürg
authors.initials: J
authors.lastname: Meyer
mesh_terms: D000293:Adolescent; D016009:Chi-Square Distribution; D002648:Child; D003744:Dental Enamel Hypoplasia / Q000453:epidemiology*; D005457:Fluoridation; D009050:Fluorosis, Dental / Q000453:epidemiology*; D006801:Humans; D015588:Observer Variation; D023861:Photography, Dental; D015995:Prevalence; D012424:Rural Population; D012571:School Dentistry; D017673:Sodium Chloride, Dietary; D013557:Switzerland / Q000453:epidemiology; D014505:Urban Population
chemical_list: D017673:Sodium Chloride, Dietary