tailieunhanh - Báo cáo vật lý: "Analysis of Trace Elements in Teeth by ICP-MS: Implications for Caries"

Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Analysis of Trace Elements in Teeth by ICP-MS: Implications for Caries | Journal of Physical Science Vol. 21 2 1-12 2010 1 Analysis of Trace Elements in Teeth by ICP-MS Implications for Caries Mohamed A. Amr and Abdul Fattah I. Helal Nuclear Physics Department NRC Atomic Energy Authority Cairo 13759 Egypt Corresponding author amrewis@ Abstract Teeth are good indicators of environmental exposure to heavy metals and of nutritional status. Inductively coupled plasma-mass spectrometry ICP-MS was used to compare the content of trace elements in primary and permanent teeth. For this purpose primary teeth were collected from 64 children and 112 permanent teeth were collected from 40- to 60-year-old adults. The data were assessed statistically using t-tests. We found that in comparison to primary teeth permanent teeth contained significantly higher concentrations of Na Mg Al Fe Ni Cu Sr Cd Ba Pb and U and significantly lower concentrations of Mn Co As Se Mo and Bi. In addition a comparison of the concentrations of trace elements in the pulps of individuals with healthy vs. carious teeth showed that the mean concentrations of Na Al Cr Mn Co Cu Zn Mo Ag Bi and U were lower in those with carious teeth. However the concentrations of Mg Cd and Pb in the pulps were higher in individuals with carious teeth than in those with healthy teeth. Keywords ICP-MS teeth trace elements caries teeth pulps 1. INTRODUCTION Biomonitoring of trace elements in human teeth has become an important tool to evaluate an individual s nutritional and environmental Primary teeth are easily obtained because they naturally exfoliate as the permanent teeth erupt. Variations in the content of trace elements in the teeth have been previously Trace elements can be ingested by humans via different routes including ingestion in the food and water or by deliberate consumption of soil and by dermal absorption. The presence and or absence of trace elements in the environment influences their availability to For example in the rural areas of