猫尖牙受扭转力后牙周膜微血管改变的实验研究

目的研究猫尖牙牙周膜微血管正常结构及其受正畸扭转力1周后牙周膜微血管的改变。方法5只雄性恒牙列早期家猫，上颌左侧尖牙施加约50g扭转力，右侧作对照。1周后进行动脉墨汁血管灌注，火棉胶连续切片，光镜下观察猫尖牙正常牙周膜微血管结构及受力后改变，并利用图像分析仪牙周膜进行定量分析。结果受正畸扭转力作用1周后，牙周膜宽度在张力区明显变宽，在压力区牙周膜唇侧区域受正畸力作用后血管活化较差，颈部张力区局部出现无细胞区及无血管区，表现出较剧烈变化，根尖区则表现微血管活化。结论猫恒尖牙施加扭转力1周时间，牙周膜的微血管即发生改变；受扭转力的猫尖牙牙周膜不同部位的微血管床的改变不同；正畸力作用后的唇侧接近颈部的牙周膜微血管活化较差。

Changes in the Microvascular Bed of the Periodontal Ligament in an Experimental Cat Canine Rotation

Objective To study the normal microvascular bed of the periodontal ligament of the cat canine and its changes induced by orthodontically rotated force. Methods Five young male cats were used.A 50g rotated force was applied to the maxillary right canine, and the left side were served as the contrast.Seven days later the cats were vascular-perfused and the canines were decalcified, cellidin embedded, serially sectioned and stained with eosin.The sections were then observed under light microscopy and the data was analyzed with Image Analyser. Results The experimental periodontal ligament in tension area was widened and narrowed in pressure area.The changes in apical 1/3, middle 1/3 and cervical 1/3 of periodontal ligament were different.Vascularization was low in buccally cervical periodontal ligament.The cell and vascular disappeared in locally cervical tension areas.The vascularization was showed in root apex. Conclusions The periodontal ligament of cat canine was changed after one week's rotated force.The experimental rotated force induced different changes in different area of cat periodontal ligament.The vascularization in buccal area approximately cervical periodontal ligament was low.