下颌乳中切牙釉质表层钙含量分析  

Analysis of the calcium content in enamel surface layer of mandibular deciduous central incisor

作　　者：刘芸[1] 石四箴[2] 

机构地区：[1]南方医科大学附属深圳市妇幼保健院口腔病防治中心,广东深圳518048 [2]同济大学儿童口腔医学研究所,上海200032

出　　处：《口腔医学》2014年第5期375-378,共4页Stomatology

摘　　要：目的研究正常下颌乳中切牙釉质表层50μm内钙含量及分布,探讨其与年龄、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釉质表层50μm内不同深度钙含量,并以标本所在个体的年龄、龋患状况分组,对于不同深度钙含量差异、钙含量与年龄及龋患状况之间的关系分别进行统计学分析。结果下颌乳中切牙釉质表层50μm内钙含量均值为(38.39±0.92)%,不同深度、不同年龄、不同龋患状况组间钙含量均无统计学差异。仅下颌乳中切牙釉质表面下40μm处钙含量与龋补牙数之间呈低度负相关关系(r=-0.3573,P<0.05),其余相关分析结果均无统计学意义。结论正常下颌乳中切牙釉质表层50μm内钙分布呈均质状态,其钙含量与年龄无明显相关关系,发育正常的下颌乳中切牙釉质表层钙含量不能作为反映个体龋患状况的单一指标。Objective To study the content and distribution of calcium 50 μm inside down from the enamel surface of normal mandibular deciduous central incisor as well as its correlation with age and caries status in children. Methods Calcium content of 40 mandibular deciduous central incisors was measured at different depths 50 μm inside down from the enamel surface with the Electron Probe X-ray Microanalysis. The specimens were divided into groups according to their hosts＇age and caries status respectively. The differences of calcium content at different depths and the correlation between calcium content and age as well as between calcium content and caries status were all analyzed statistically. Results Average calcium content of 40 mandibular deciduous central incisors 50μm inside down from the enamel surface was 38.39 ± 0.92 （wt%） and there was no statistical difference at different depths, among different age groups and caries status groups respectively. There was low negative correlation between decayed-filled tooth and the calcium content at 40 μm depth beneath enamel surface （r = -0. 3573 ,P 〈 0.05） ,but no other correlations were discovered. Conclusions Calcium content 50 μm inside down from the enamel surface of normal mandibular deciduous central incisors is distributed homogeneously, which has no significant correlation with the age and cannot be used as the single indicator of caries status.

关 键 词：乳中切牙 牙釉质 钙 龋 电子探针显微分析 

分 类 号：R780.1[医药卫生—口腔医学]