The density and branching of dentinal tubules in human teeth
The density and branching of dentinal tubules in human teeth
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DOI：
10.1016/0003-9969(96)00008-8
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发表时间：
1996-05-01
影响因子：
3
通讯作者：
Nordahl, I
中科院分区：
文献类型：
--
作者：
Mjor, IA;Nordahl, I
详细了解牙本质结构，特别是牙本质小管的结构，对于了解牙本质渗透性和解释牙本质粘合材料的调查数据是必不可少的。本研究的目的是通过光镜和扫描电镜观察人牙本质小管的密度和分支。研究了染色和未染色的脱矿切片和未矿化的骨折标本。根据位置的不同，发现小管密度存在统计学显著差异。在周围和内部方面之间的小管密度的差异更显着的冠比根。牙根中部牙本质小管的平均数量显著低于牙冠中部。牙尖部外牙本质小管的密度与牙合裂旁牙本质小管的密度也有显著性差异。牙本质小管的分支数量在小管密度低的位置特别丰富。分支模式显示了一个复杂而丰富的小管，封闭系统，纵横交错的管间牙本质。三种类型的分支，主要的，罚款和微分支，确定的基础上的大小，方向和位置。主枝，直径0.5-1.0 μ m，是在周边发现的典型三角洲分支。细分支，直径300-700 nm，呈45度分叉，在小管密度相对较低的根部等区域丰富。微分支，直径25-200 nm，从牙本质的各个部分的小管以直角延伸。研究结果强调，需要详细表征牙本质基质的粘合剂测试和渗透性研究中使用的样品。版权所有（C）1996 Elsevier Science Ltd.
Detailed knowledge of dentine structure, and especially that of the dentinal tubules, is essential in order to understand dentine permeability and to interpret data from investigations on dentine adhesive materials. The aim here was to examine the density and branching of dentinal tubules in human teeth by light and scanning electron microscopy. Stained and unstained demineralized sections and undemineralized fractured specimens were studied. Statistically significant differences in the density of tubules were found depending on location. Differences in density of tubules between the peripheral and inner aspects were more marked in the crown than in root. The mean number of dentinal tubules in the middle part of the root was significantly lower than in the middle part of the crown. The density of the tubules in the outer dentine at the cusp location was also significantly different from that subjacent to the occlusal fissure. The number of branches of dentinal tubules was particularly abundant in locations where the density of tubules was low. The branching patterns revealed an intricate and profuse canalicular, anastomosing system, criss-crossing the intertubular dentine. Three types of branches, major, fine and microbranches, were identified on the basis of size, direction and location. Major branches, 0.5-1.0 mu m dia., were the typical delta branchings found peripherally. Fine branches, 300-700 nm dia., forked off at 45 degrees and were abundant in areas such as in the root where the density of the tubules was relatively low. Microbranches, 25-200 nm dia., extended at right angles from the tubules in all parts of the dentine. The findings emphasize the need for detailed characterization of dentine substrates for adhesive testing and of samples used in permeability studies. Copyright (C) 1996 Elsevier Science Ltd.