Caries status in 16 year-olds with varying exposure to water fluoridation in Ireland

J. Mullen, J. McGaffin, N. Farvardin, S. Brightman, C. Haire, R. Freeman

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    Most of the Republic of Ireland’s public water supplies have been fluoridated since the mid-1960s while Northern Ireland has never been fluoridated, apart from some small short-lived schemes in east Ulster. Objective: This study examines dental caries status in 16 year-olds in a part of Ireland straddling fluoridated and non-fluoridated water supply areas and compares two methods of assessing the effectiveness of water fluoridation. The cross-sectional survey tested differences in caries status by two methods: 1, Estimated Fluoridation Status as used previously in national and regional studies in the Republic and in the All-Island study of 2002; 2, Percentage Lifetime Exposure, a modification of a system described by Slade in 1995 and used in Australian caries research. Methods: Adolescents were selected for the study by a two-part random sampling process. Firstly, schools were selected in each area by creating three tiers based on school size, and selecting schools randomly from each tier. Then random sampling of 16-year-olds from these schools, based on a pre-set sampling fraction for each tier of schools. Results: With both systems of measurement, significantly lower caries levels were found in those children with the greatest exposure to fluoridated water when compared to those with the least exposure. Conclusions: The survey provides further evidence of the effectiveness in reducing dental caries experience up to 16 years of age. The extra intricacies involved in using the Percentage Lifetime Exposure method did not provide much more information when compared to the simpler Estimated Fluoridation Status method.
    Original languageEnglish
    Pages (from-to)293-296
    Number of pages4
    JournalCommunity Dental Health
    Issue number4
    Publication statusPublished - Dec 2012


    • Unemployment
    • Humans
    • Water Supply
    • Ireland
    • Northern Ireland
    • Pit and Fissure Sealants
    • Dental Caries
    • Dental Restoration, Permanent
    • Cross-Sectional Studies
    • Cariostatic Agents
    • Fluoridation
    • Environmental Exposure
    • Residence Characteristics
    • Occupations
    • Adolescent
    • Fluorides
    • DMF Index
    • Tooth Loss
    • Female
    • Male


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