アブストラクト(27巻1号:神奈川歯学)

神奈川歯学

Japanese

Title : 乳歯の微量金属に関する研究 - 細分化による微量金属の分布について -
Subtitle : 原著
Authors : 清水貴代美1),2), 檜垣旺夫1), 斎藤滋2)
Authors(kana) :
Organization : 1)神奈川歯科大学小児歯科学教室, 2)神奈川歯科大学口腔生化学教室
Journal : 神奈川歯学
Volume : 27
Number : 1
Page : 1-17
Year/Month : 1992 / 6
Article : 原著
Publisher : 神奈川歯科大学学会
Abstract : 「緒言」近年, 微量で人体に影響を与える物質の報告が多い. 地球は閉鎖系であり, 人類が長年かかって現代まで進化してきた過程を考えると, 時代時代で生物および無生物が作り上げてきた環境に調和し, 自然と共に適応進化してきている. すなわち, 人間社会が健全な発展を遂げるためには, 自然と調和した良好な環境を創造してゆくことが必須条件であり, 生態系を考慮した環境の十分な把握と的確な評価が常に必要となってくる. さて, 現在, 環境を評価する方法は, 多岐多様で, 各分野において研究課題となっている. しかし, 人体に対する評価法は, その環境変化が生じた後に後向きに研究されることが一般的であり, また, 環境と人体の関わりについても, 過去の試料および研究材料が乏しいため系統的で一定した見解を得ておらず, その環境基準でさえ現段階においては漠然としたものになっている.
Practice : 歯科学
Keywords : 微量金属, 乳歯, カドミウム, 亜鉛, 鉛, 銅

English

Title : A Study of Trace Elements in Deciduous Teeth - Distribution Patterns of Trace Elements in Enamel and Dentin of Deciduous Teeth -
Subtitle :
Authors : Kiyomi SHIMIZU1), Morio Higaki1), Shigeru Saito2)
Authors(kana) :
Organization : 1)Department of Pediatric Dentistry, Kanagawa Dental College, 2)Department of Oral Biochemistry, Kanagawa Dental College
Journal : Kanagawa Shigaku
Volume : 27
Number : 1
Page : 1-17
Year/Month : 1992 / 6
Article : Original article
Publisher : Kanagawa Odontological Society
Abstract : Abstract: Trace elements in human deciduous teeth apear to be of value for an index of body burden, since trace elements in teeth are considered virtually permanent. Previously, we reported an accurate measurement of the trace elements Cd, Zn, Pb and Cu in small pieces of deciduous teeth performed using flameless atomic absorption spectrophotometry after each element was separated by ion chromatography with cation exchange resin. The purpose of this study was to investigate the distribution of the trace elements Cd, Zn, Pb and Cu in enamel and dentin of deciduous tooth which was divided into 24 particles. Samples were prepared from human deciduous second molars which were separated into three layers (curpid layer, middle layer, cervical layer) and each layer was divided into four parts (mesial, distal, buccal and lingual part) respectively. For each tooth, a total of 12 particles were analyzed after divided being into enamel and dentin. The resultant findings were as follows: 1) The concentration of trace elements in deciduous teeth has various values among each part, respectively. 2) The content of Cd, Zn and Pb in the cervical layer of deciduous teeth showed significantly higher than the other layers in enamel. Meanwhile, in dentin, the concentration of Cd, Zn and Pb showed a tendency of high values in the cuspid layer. However, Cu levels in both hard tissues were comparatively regular among the three leyers. 3) In enamel, the content of Cd, Zn and Cu in the mesial part was significantly higher than those in other parts. Meanwhile, in dentin, the gradients were not smooth for Cd, Zn and Cu. However, Pb levels in both hard tissues were comparatively regular among the four parts. 4) As compared with the concentration of trace elements in enamel and dentin, the mean concentration of each element in enamel was significantly higher than those in dentin. Based on the above findings, the distribution patterns obtained which provided useful information about the relationship between the concentration of trace elements in deciduous teeth and the effect of exposure by multiple sources.
Practice : Dentistry
Keywords :