NAIL AS A BIOMARKER OF CHRONIC FLUORIDE EXPOSURE FROM THE DIET IN FLUORIDATED AND NON-FLUORIDATED COMMUNITIES. / Unha como biomarcador de exposição crônica ao flúor a partir da dieta em comunidades fluoretada e não fluoretada

AUTOR(ES)

Flávia Mauad Levy

DATA DE PUBLICAÇÃO

2003

RESUMO

The aim of the present study was to verify if nails can be used as biomarkers of chronic fluoride (F) exposure from the diet in children living in fluoridated and non-fluoridated communities. Fluoride intake frorm the diet was also evaluated. Fifteen 2-6-year-old children living in the fluoridated (0.6 -0.8 ppm) Bauru-SP and 15 living in the non-fluoridated Itápolis-SP participated in the study. Fluoride concentrations in nails, plasma and duplicate diet were analyzed with the ion-specific electrode, following HMDS-facilitated diffusion. Data were analyzed by Student’s t test and by linear regression (p<0.05). Mean plasma F concentration (µg/mL) found in Itápolis (0.024 ± 0.020) was slightly higher than in Bauru (0.019 ± 0.011), but this difference was not significant. Mean F concentrations (µg/g) in fingernails and toenails were: 3.557±1.297 and 2.815±1.288, respectively, for Bauru and 2.292±1.250 and 1.580±0.589, respectively for Itápolis. The differences between Bauru and Itápolis, as well as between F concentrations in fingernails and toenails were statistically significant. The estimated fluoride intake from the diet was significantly higher for the children living in Bauru (0.551±0.610 mg), when compared to those living in Itápolis (0.088±0.056 mg). This corresponds to a total daily F intake of 0.028 and 0.003 mg/Kg body weight for children living in Bauru and Itápolis, respectively. A significant positive correlation was found between nail F concentrations and estimated F intake from the diet (r=0.566, p=0.00112). It was concluded that nails can be used as biomarkers of chronic F exposure from the diet to differentiate children at the age of risk for dental fluorosis living in fluoridated and non-fluoridated communities.

ASSUNTO(S)

fluoração das águas flúor dieta biomarcadores

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