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牙齿施力与牙周膜(PDL)的血液循环关系密切。我们知道,正畸施力以不影响PDL毛细血管的血液循环为原则。20-26g/cm~2施力标准一直被视为不可愈越的界限。施力过大,势必造成压力侧血流障碍,使PDL缺血缺氧,变性而坏死。 Gianelly(1966)用狗的牙齿作试验,使用墨汁灌注法发现,当力超过50g时,血流有减少,超过100g,血流明显减少,但仍有部分血管是张开的。当力超过150g,PDL的血流阻塞。他还发现,力超过了100g后,组织变化是以潜行性骨吸收为主的。本实验是给猫牙施力后,持续2小时作
Teeth force and the periodontal ligament (PDL) blood circulation is closely related. We know that orthodontic force does not affect the blood circulation of PDL capillaries. 20-26g / cm ~ 2 force standard has always been regarded as the threshold of unmanageable. Forces too large, is bound to cause pressure-side blood flow disorders, so that PDL hypoxia, degeneration and necrosis. Gianelly (1966) tested the dog's teeth using ink-perfusion and found that when the force exceeded 50 g, blood flow decreased more than 100 g, blood flow was significantly reduced, but still some blood vessels were open. When the force exceeds 150g, PDL's blood flow is blocked. He also found that, after more than 100g of force, the organizational change is based on the sneaky bone resorption. This experiment is to force the cat teeth, sustained 2 hours for