【摘要】 目的　为研究牙齿在压低力作用下牙周膜 (PDL)微循环的变化情况。方法　本研究采用成年雄性杂种犬为实验对象 ,建立牙齿压低移动动物实验模型 ,利用计算机图象分析系统定量研究牙齿压低 2 1天后以血管墨汁灌注标记的牙周膜微循环的变化。结果　大小不同的压低力作用于切牙 ,可引起不同程度的PDL血管化反应 :实验组血管化反应增强 ,且实验组与对照组及实验组间的微血管数量、管径、体密度均存在显著差异。结论　压低力是引起PDL微循环发生适应性变化的根本原因 ,本研究认为犬切牙压低力以 30gm/cm2 左右最为合适 ;牙周膜血管化反应的强弱反映了正畸牙周组织改建的好坏 ,是评价牙周组织改建好坏的指标更多还原

【Abstract】 Objective To investigate the changes in periodontal ligament’s (PDL’s) microcirculation incident to the incisor intrusion. Method An experimental animal model for incisor intrusion was established using adult hybrid dogs and the vasculature was perfused with the ink. Results There are different degrees of vascularization when different magnitude forces was used to intrude the experimental teeth for 21 days. The activity of the vasculature was increased, Also there were statistical significance in micro blood vessel number? diameter and volume density between the treatment and control group and among the treatment groups. Conclusion The Intrusive force is the main cause of the adaptive changes of the PDL’s microcirculation. We think that the optimal intrusive force of the dog’s incisor was 30gm/cm 2 or so. The degrees of the PDL’s microcirculation shows the avtivity of the orthodontical PD tissue remodeling, which is also an indicator to envaluate the remodeling of the PD tissue.更多还原