人歯牙の含有水銀およびカドミウム量に関する研究
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概要
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The metabolism of heavy metal has been investigated by atomic absorption spectrophotometry but the quantity of mercury and cadmium, which are frequent causes of pollution, in human teeth has not been determined well. For this research, therefore, measurements were taken of mercury and cadmium levels through precise basic researches. Mercury was measured by non-flame circulation vapor caused by reagent and cadmium by acetylene-air combustion. The teeth, obtained randomly from three different geographic areas, were defined as dry weight and were ashed by perchloric acid. Then the mercury and cadmium contents were determined. 1. The average mercury level in normal fifty seven teeth was 0.055μg/g. The normal teeth had no significant differeneces among sex, age, type of teeth and geographic regions. 2. Eight normal deciduous teeth had 0.057μg/g of mercury level and fourty nine permanent teeth had 0.055μg/g. There were no significant differences between the two groups. 3. The carious teeth were divided into C_2 (6 cases), C_3 (34) and C_4 (66) and the averages of mercury concentration were 0.081μg/g, 0.069μg/g and 0.075μg/g respectively. The four degree of caries group contained significantly heigher level than the normal teeth. The mercury levels in carious teeth require further examination. 4. The amalgam filling and endodontically treated teeth which were excluded from statistical dealing indicated more than 0.4μg/g of mercury level. 5. The cadmium concentration in twenty five of normal teeth was 0.52μg/g on the average. 6. The mercury and cadmium levels in enamel tissue were apparently higher than those of dentine. The fundamental study made it possible to determine the concentration of mercury and cadmium burden in teeth and to obtain statistical data attributable to region, sex, year, carious degree and tissue from the standpoint of enviromental health. The findings on mercury in this study, in particular, presented base levels expected to be found in general population.
- 九州歯科学会の論文
- 1975-03-31
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