(1)牙本质(Dentin)：构成牙的主体,包绕着牙髓腔.牙本质主要由牙本质小管(dentinal tubule)与间质构成.牙本质小管从牙髓腔面向周围呈放射状走行,愈向周边愈细,且有分支吻合.
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Furthermore, friction and wear behaviors of tooth depend strongly on microstructure orientations. A tooth shows better wear-resistance along the occlusal section than along the axial section due to the orientation of the enamel rods and the dentinal tubule.2.
此外，牙齿微观结构取向会显著影响牙齿的摩擦磨损行为，鉴于釉柱和牙本质小管的取向，同一颗牙齿在(牙合)向截面上的耐磨性优于轴向截面。
参考来源 - 牙齿的摩擦学特性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
It was testified by sem that the dentinal tubule was sealed by semiconductor laser irradiation.
扫描电镜显示，用半导体激光仪照射后，牙本质小管口被封闭。
There were significant differences ( P< 0.05) in the relative area of the dentinal tubule orifices between two groups.
牙本质小管口的相对面积各组之间的差异均有显著性（P<0.05）。
Conclusions Applying 30% supersaturated potassium oxalate to block dentinal tubule could prevent or reduce crown surface discoloration effectively after front teeth canal therapy.
结论使用30%草酸钾封闭牙本质小管可有效防止及减少前牙根管治疗后牙冠变色。
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