Abstract
The absolute concentrations of these elements were obtained by calibration with the animal-bone standard of the International Atomic Energy Agency. From exfoliated deciduous incisors and canines of 193 6- and 9-year-old children living in four Finnish towns, 77 enamel samples from subjects with low and high caries (dmfs = 0 and 6, respectively) were analysed. There were no statistically significant correlations between Zn and caries, or Pb and caries, but a weak positive correlation existed between Sr and caries ( r = 0.341; p < 0.001). The lead concentration in incisors (8.1 ± 5.3 parts/10 6) was twice as high as in canines (4.1 ± 2.6 parts/10 6), whereas the Sr concentration was lower (63 ± 18 and 85 ± 13 parts/10 6, respectively) emphasizing the importance of relating such analysis to the tooth type.
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