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目的:检测牙本质龋中化学成分的空间分布。方法:应用电子探针微区分析(EPMA)技术对牙本质龋中化学成分的空间分布进行检测。结果:牙本质龋中除含有主要的Ca、P、O元素外,尚含有Mg、Cl、Na、Al等微量元素;定点分析及面扫描分析显示,所形成的牙本质裂隙内Mg原子百分比、Mg/Ca摩尔比及Mg浓度均高于裂隙外,而其它微量元素含量在裂隙内、外无明显差异。结论:Mg是牙本质龋病变中优先丢失的成分之一,可能参与牙本质龋的脱矿和再矿化过程。
Objective: To detect the spatial distribution of chemical components in dentine caries. Methods: The spatial distribution of chemical components in dentine caries was detected by electron probe microanalysis (EPMA). Results: Dentin caries contained trace elements such as Mg, Cl, Na and Al in addition to the main Ca, P and O elements. The results of site-specific analysis and surface scan analysis showed that the percentage of Mg atoms in the formed dentin fissures, The Mg / Ca molar ratio and Mg concentration were higher than that of the fissures, while the contents of other trace elements in the fissures were not significantly different. Conclusion: Mg is one of the preferential lost components in dentine caries lesions and may participate in the demineralization and remineralization of dental caries.