Tissue fluid pressure in the periodontal ligament was measured in dog canine teeth placed in traumatic occlusion for 48 hours. The pressure in experimental teeth was 19 mm Hg, which is significantly higher than the 10 mm Hg recorded for contralateral control teeth.
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Petrakis, N.L. : Bone Marrow Pressures in Leukemic and Non-Leukemic Patients, J Clin Invest33:27, 1954.
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