Fogel H M, Marshall F J, Pashley D H
Oregon Health Sciences University, School of Dentistry, Portland 97201.
J Dent Res. 1988 Nov;67(11):1381-5. doi: 10.1177/00220345880670110401.
The purposes of this study were: (1) to measure the effect of distance from the pulp on the hydraulic conductance of human radicular dentin; (2) to determine the influence of dentin thickness on the rates of fluid flow; and (3) to attempt to correlate dentinal tubule densities and diameters with root dentin hydraulic conductance. Dentin slabs prepared from extracted, unerupted, human third molar teeth were placed in a split-chamber device to permit quantitation of fluid filtration rate (hydraulic conductance). In the SEM portion of the study, dentinal tubule numbers and diameters were recorded. The results indicated that radicular dentin hydraulic conductance decreased with distance from the pulp and with increasing dentin thickness. Tubule density and diameter correlated well with the measured hydraulic conductances. The relatively low hydraulic conductance of outer root dentin makes it a significant barrier to fluid movement across root structure.
（1）测量距牙髓的距离对人牙根牙本质水力传导性的影响；（2）确定牙本质厚度对流体流速的影响；（3）尝试将牙本质小管密度和直径与牙根牙本质水力传导性相关联。从拔除的、未萌出的人类第三磨牙制备的牙本质薄片被放置在一个分隔腔装置中，以定量流体过滤速率（水力传导性）。在该研究的扫描电子显微镜部分，记录了牙本质小管的数量和直径。结果表明，牙根牙本质的水力传导性随着距牙髓距离的增加和牙本质厚度的增加而降低。小管密度和直径与测量的水力传导性密切相关。牙根外层牙本质相对较低的水力传导性使其成为流体穿过牙根结构的一个重要屏障。
