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目的研究乳牙釉质和牙本质中钙含量及分布,探讨其与龋患状况之间的关系。方法运用电子探针显微分析仪测定40颗离体下颌乳中切牙纵剖面上不同深度的钙含量,并以标本所在个体的龋患状况分组,分别进行统计学分析。结果 40例下颌乳中切牙标本的总计钙含量均值为37.13±1.10(wt%)。其中,牙釉质钙含量均值为38.31±0.94(wt%),牙本质钙含量均值为36.66±1.38(wt%);牙釉质表层下50μm、100μm处钙含量高于250μm处钙含量;牙本质釉牙本质界下50μm、100μm处钙含量分别低于450μm、500μm、550μm、600μm处钙含量。正常乳牙钙含量在无龋组、龋病低危组、龋病高危组间未见统计学差异。正常乳牙钙含量与龋补牙数、龋补牙面、龋蚀指数之间均无相关关系。结论正常乳牙中钙元素分布呈非均质状态。牙釉质钙含量从表层向釉牙本质界方向呈逐渐下降趋势;牙本质钙含量从釉牙本质界向髓腔侧呈逐渐上升趋势。发育正常的乳牙钙含量不能作为反映个体龋患状况的单一指标。
Objective To study the calcium content and distribution in primary enamel and dentin of deciduous teeth and to explore its relationship with caries status. Methods Electron probe microanalyzer was used to measure the calcium content in different depths of 40 mandibular incisors. The caries were divided into groups and analyzed statistically. Results The total calcium content in 40 cases of mandibular central incisors was 37.13 ± 1.10 (wt%). The mean calcium content of enamel was 38.31 ± 0.94 (wt%) and the average content of dentin calcium was 36.66 ± 1.38 (wt%). The content of calcium at 50μm and 100μm of enamel surface was higher than that at 250μm. The dentin boundary 50μm, 100μm calcium content below 450μm, 500μm, 550μm, 600μm calcium content. The calcium content of normal deciduous teeth in caries-free group, caries low risk group, caries risk groups no significant difference. Normal deciduous calcium content and dental caries, dental caries, dental caries index no correlation between. Conclusion The calcium distribution in normal deciduous teeth is inhomogeneous. Enamel calcium content from the surface to enamel dentin bound to a downward trend; dentin calcium content from enamel dentin bound to the medullary cavity was gradually increased. Normal deciduous calcium content can not be used as a single indicator of individual caries status.