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A three-dimensional analysis of enamel thickness and enamel-dentine junction form in permanent human teeth

人类恒牙牙釉质厚度和牙釉质-牙本质连接形态的三维分析

基本信息

批准号：
14540657
负责人：
SUWA Gen
金额：
$ 2.24万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540657/
关键词：
human permanent teeth enamel thickness enamel-dentine junction micro-CT エナメル質厚さ

项目摘要

In the present study, 318 permanent human tooth crowns were micro-CT scanned and thigh resolution volume data sets obtained. Data analysis focussed primarily on enamel thickness measurements taken in the mesial cusp section of 167 unworn molars. We obtained the following results. Enamel thickness at the cusp tips and occlusal basin in sections slightly offset from the mesial cusp section was found to be inaccurate by up to about 0.5 to 1 mm. We also found that maximum 'radial' thickness of the lateral crown face was least affected by section position, usually with discrepancies of less than about 0.1-0.2 mm. Mid-lateral crown thickness was found to vary by definition of the horizontal reference plane, and thus less useful in evaluating enamel distribution patterns than maximum lateral thickness. In all serial positions in both upper and lower molars, a 'functional' to 'non-functional' side gradient in enamel thickness was observed in cusp tip, occlusal basin, and lateral crown face enamel, with the exception of the characteristically thin enamel at the protoconid and paracone cusp tips. Serial differences in thickness were seen between the thinner M1 and the two posterior molars in many but not all measures of thickness, the pattern of which appears to be influenced by the thin M1 mesiobuccal cusp enamel. Individual variation of maximum lateral thickness, the least variable measure of thickness, was found to be substantial even with serial and buccolingual positions controlled. Correlation between whole crown average enamel thickness and maximum lateral thickness was high, indicating that the latter is a potentially useful predictor of overall enamel thickness of the molar crown.

在本研究中，对 318 个人类恒牙牙冠进行了显微 CT 扫描，并获得了大腿分辨率体积数据集。数据分析主要集中于在 167 颗未磨损磨牙的近中牙尖部分进行的牙釉质厚度测量。我们得到了以下结果。发现牙尖尖和咬合盆部分的牙釉质厚度与近中牙尖部分稍微偏移，误差高达约 0.5 至 1 毫米。我们还发现，侧冠面的最大“径向”厚度受截面位置的影响最小，通常差异小于约 0.1-0.2 毫米。发现中外侧牙冠厚度根据水平参考平面的定义而变化，因此在评估牙釉质分布模式方面不如最大外侧厚度有用。在上磨牙和下磨牙的所有连续位置中，在牙尖尖、咬合盆和侧冠面牙釉质中观察到牙釉质厚度的“功能性”到“非功能性”侧梯度，但原圆锥尖和旁锥尖尖处的特征性薄牙釉质除外。在许多（但不是所有）厚度测量中，较薄的 M1 和两颗后磨牙之间的厚度存在系列差异，其模式似乎受到较薄的 M1 近颊尖牙釉质的影响。研究发现，即使控制连续和颊舌位置，最大横向厚度（厚度变化最小的测量值）的个体差异也很大。全牙冠平均牙釉质厚度与最大横向厚度之间的相关性很高，表明后者是磨牙牙冠整体牙釉质厚度的潜在有用预测因子。