Abstract
For the purpose of studying the vascular permeability of periodontal membranes in relation to tooth movement, monophasic stimuli were provided by putting 0. 20, 0.13 and 0.08 mm thick bands on the upper first molars of rats. Horseradish peroxidase was used as a tracer to examine the permeability histochemically.The results are as follows:1. In periodontal membrane compressed to less than 2/3 of the original width:1) The permeability increased immediately after tooth movement and reached its maximum after 3 and 6 hours.2) After one day the area with the increased permeability was observed at the periphery of the so-called anoxia tissue. After 5 days it appeared at the periphery of the necrotic tissue and the granulation-like tissue.3) On the control side the permeability also increased in the first 6 hours.2. In the periodontal membrane not compressed to less than 2/3 of the original width faint and transient increment of the permeability appeared, and no remarkable tissue changes were noted.3. On the tension side the permeability was always weaker than that of the pressure side.4. The mechanism of the enhancement of the permeability during the first 6 hours seemed different from that of one and 5 days.
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