The responses of the microvasculature of the periodontal ligament to horizontal force
He, Y.; Xu, J.; Deng, Y.
Zhonghua Kou Qiang Yi Xue Za Zhi 33(5): 309-311
1998
ISSN/ISBN: 1002-0098 PMID: 11774665 Document Number: 490341
The purpose of this study is to examine the responses of the microvasculature in periodontal ligament(PDL) to horizontal force. Using ink injections and celloidin embed, serial sections were cut, then observed by light micrascope, quantitative analysis was conducted by the picture-analysis instrument. Vascular corrosion casts were prepared and examined by scanning electron microscopy. The forth premolars of dogs were pulled by 200 g force in a mesial direction for two hours, and the pressure effects in different positions were demonstrated. The section area of the microvasculature per unit PDL area is obvious larger on the tension sides than on the pressure sides. There is not an obvious distinction on the pressure sides between the experiment groups and control groups. However, there are clear distinctions in the one-third of cervical, and apical segment on the tension sides between the experiment groups and control groups. The microvascular changes in PDL had importance to the cushioning effect of PDL when a teeth received a kind of force in a short-time.