Abstract
Previously, S. Kumasaka reported on an experiment in which the metal chromatography for the separation of trace elements was employed by using a gradient mixture of a volatile solution of hydrochronic acid and acetone (0.64MHC1,40-86 % acetone). Macroporous cation exchange resin amberlite-200 was used as a filler. Also it was shown that this method was an extremely effective means for the quantitative determination of Cd, Zn, Pb and Cu in deciduous teeth, particularly by utilizing the flameless atomic absorption spectrophotometry method.
The author, then, measured variations in Cd, Zn, Pb and Cu content in the enamel and dentine of the various types of deciduous teeth.
Cd, Zn, Pb and Cu values of the enamel and dentine were obtained by analyzing 100 deciduous teeth using the flameless atomic absorption spectrophotometry method. The following results were obtained:
1)The mean values (μg/g) of trace elements in the enamel and dentine were determined as 0.97±0.422 and 0.60±0.225 for Cd,179.78±29.450 and 151.23±20.502 for Zn,18.01±5.575 and 29.59±8.601 for Pb,7.51±2.163and 4.55±1.542 for Cu, rcspectively.
2) The mean concentrations of Cd, Zn, Pb and Cu in the enamel of all the teeth were significantly higher than those in the dentin, while the mean concentration of Pb in the enamel was significantly less than that in the dentin.
3) In comparison among the tooth types, the mean concentrations of the four metals in both the enamel and dentin decreased from incisors to molars.
