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Microcirculatory change of periodontal ligament incident to incisor intrusion on dog

Shi Jianlu, Cheng Xiangrong, He Hong, et al. Stomatology Institute of Wuhan University, Wuhai 430079  
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.
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