Changes in dental fluorosis following the cessation of water fluoridation.

OBJECTIVES: To determine changes in the prevalence of dental fluorosis, and in perceptions of aesthetic concerns due to dental fluorosis after water fluoridation ceased. METHODS: Schoolchildren in second and third grades were examined in 1993-94, 1996-97 and 2002-03 to determine changes in the prevalence of dental fluorosis following fluoridation cessation of the public water supplies in 1992. The Thylstrup-Fejerskov Index (TFI) was used to quantify dental fluorosis. Perceptions of aesthetics were assessed by questionnaires which were sent home to parents. Residence and dental histories were confirmed on all children to determine the extent of exposure to all types of fluorides. Comparisons between the three surveys were used to establish the influence of fluoridated water and other fluoride sources on the occurrence and severity of dental fluorosis. Aesthetic ratings from parents were used to assess the aesthetic conditions of maxillary anterior teeth across the three surveys. RESULTS: When fluoride was removed from the water supply in 1992, the prevalence and severity of TFI scores decreased significantly from the 1993-94 survey cycle when compared with the 1996-97 and 2002-03 survey cycles. The use of fluoride supplements and fluoride dentifrice also decreased during this study period. Analyses were unable to determine the influence of these different fluoride exposures on the changes in TFI scores over time. Comparisons of aesthetic ratings from parents between survey cycles failed to show any significant differences.

Perceptions of desirable tooth color among parents, dentists and children.

BACKGROUND: As part of a large-scale fluoridation cessation study, standardized examiners assessed 8,281 school-aged children for dental fluorosis using the Thylstrup Fejerskov index, or TFI, in which scores range from 0 (no fluorosis) to 9 (severe loss of enamel with change of anatomical appearance). METHODS: Dentists, parents and children were asked to respond to a statement, "The color of these teeth (mine or my child's) is pleasing and looks nice." Agreement or disagreement with the statement was indicated on a five-level scale, with a rating of 1 representing total agreement with the reference statement. The authors used repeated-measures analysis of variance to ascertain differences in satisfaction with the esthetic appearance of the subject's tooth color across dentists', parents' and subjects' perceptions. RESULTS: Girls were more critical of their tooth color than were boys; however, parents and dentists were more critical of boys' tooth color than of girls'. While younger subjects were more critical than older subjects, parents of younger subjects were less critical than those of older subjects. Dentists' ratings were not significantly associated with subjects' age group. Subjects with a TFI score of 1 or 2 were not significantly more critical than subjects with a TFI score of 0, while those with a TFI score of 3 of higher were. Similarly, only parents of subjects with a TFI score of 3 of higher had significantly different ratings. CONCLUSIONS: The three stakeholders in the esthetic treatment of children-parents, dentists and patients-appear to see the potential outcome of such treatment differently. CLINICAL IMPLICATIONS: Dentists should ensure that parents and children agree about the course of treatment, the rationale for undertaking it and the results that could reasonably be expected.