Biomonitoramento da ingestão de fluoretos em pré-escolares residentes de zona rural com teores residuais de flúor na água

Abstract

This work aimed biomonitoring intake of fluoride in preschool rural residents with residual fluoride levels and non-fluoridated city, estimating the risk of fluorosis and correlating exposure biomarkers. Thirty preschoolers 24-71 months, divided into two groups, one with residents of a rural area with a high concentration of fluoride in the water supply (G1-Brejo das Freiras/ São João do Rio do Peixe-PB) and another representing a city without fluoridation (G2-João Pessoa-PB). The volunteers were monitored for intake (water, solid and liquid diet, and dentifrice) and fluorine retention. The fluorine excretion in 24 hours, and samples fingernails served as biomarker. Comparative analysis, regression and correlation were significant when p ≤ 0.05. The average fluoride intake was 0.18 ± 0.14 (G1) and 0.05 ± 0.04 (G2) mg/kg/day, p <0.05. In G1 there were water contribution in daily intake (0.07 ± 0.1 mg/kg/day), as opposed to G2 determined according to the dentifrice (0.04 ± 0.04 mg/kg/day). Retention was directly proportional to the concentration of fluoride in the water in G1, following the trend of Urinary Excretion Fraction (FUFE), similar in both groups. A correlation between fluoride in the fingernails and toes, and the nails of the feet more sensitive to differences between the groups. It was concluded that there is a high intake of fluoride in the region with residual fluoride levels correlated with sensitivity of biomarkers.