Komatsu K, Viidik A
Department of Pharmacology, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Arch Oral Biol. 1996 Feb;41(2):147-59. doi: 10.1016/0003-9969(95)00114-x.
The relationship between the fibre arrangement of the periodontal ligament and the load-deformation behaviour was investigated at various loading levels. Transverse sections of the rat incisor were loaded in the eruptive direction in vitro and the deformation fixed at predetermined loads. Sections were prepared at these deformation levels. The periodontal ligaments were examined by polarized-light and scanning-electron microscopy. At the initial ("toe') part of the load-deformation curve, the periodontal fibres were gradually pulled and bent towards the direction of loading; their wavy pattern and periodic dark and bright bands became indistinct. At the next, linear part of the curve, the running direction of the fibres changed gradually until they were straightened and stretched. At the yielding part of the curve, the periodontal fibres began to rupture. Ruptured fibres adhering to the bone surface returned to their original obliquity and showed periodic dark and bright bands. The fibrous components of the rat incisor periodontal ligament thus transmit forces to bone at the linear part of the curve when the tooth is axially loaded.
在不同加载水平下，研究了牙周膜纤维排列与负荷 - 变形行为之间的关系。将大鼠切牙的横切片在体外沿萌出方向加载，并在预定负荷下固定变形。在这些变形水平下制备切片。通过偏光显微镜和扫描电子显微镜检查牙周膜。在负荷 - 变形曲线的初始（“趾”）部分，牙周纤维逐渐被牵拉并向加载方向弯曲；它们的波浪状形态以及周期性的明暗带变得不清晰。在曲线的下一个线性部分，纤维的走向逐渐改变，直到它们变直并伸展。在曲线的屈服部分，牙周纤维开始断裂。附着在骨表面的断裂纤维恢复到原来的倾斜度，并显示出周期性的明暗带。因此，当牙齿受到轴向负荷时，大鼠切牙牙周膜的纤维成分在曲线的线性部分将力传递至骨。
