Tønder K J, Naess G
Acta Odontol Scand. 1979;37(3):161-8. doi: 10.3109/00016357909004691.
Pressure in selected microvessels was measured directly on the exposed coronal or apical pulp in one of the upper canine teeth or on the gingiva in a total of 36 cats. The vessels were punctured with glass micropipettes, diameter 1-4 micrometer, and the pressure measured with a modified Wiederhielm servocontrolled counter-pressure technique. Pressures in corresponding vessels in coronal and apical pulp were similar. The pressure in pulpal arterioles, diameter 10-70 micrometer averaged 43 mm Hg, or 36% of mean systemic arterial pressure (PA), while pressure in the pulpal venules, diameter 10-80 micrometer, was on an average 19 mm Hg or 16% of PA. Capillary pressure measured in the coronal pulp averaged 35 mm Hg. Mean arterial systemic pressure was 124 mm Hg. The total vascular pressure drop within the pulp was only 20% of the total systemic arteriovenous pressure difference. Accordingly, only one fifth of the vascular resistance governing pulpal blood flow is situated within the pulp itself. This means that blood flow in the dental pulp in cats may be influenced by mechanisms located extrapulpally. In gingiva only venular pressure was measured, which averaged 19 mm Hg.
在总共36只猫的上颌尖牙之一的暴露的冠髓或根尖牙髓或牙龈上，直接测量选定微血管的压力。用直径为1 - 4微米的玻璃微量移液器穿刺血管，并用改良的维德海姆伺服控制反压技术测量压力。冠髓和根尖牙髓中相应血管的压力相似。直径为10 - 70微米的牙髓小动脉中的压力平均为43毫米汞柱，占平均体循环动脉压（PA）的36%，而直径为10 - 80微米的牙髓小静脉中的压力平均为19毫米汞柱，占PA的16%。在冠髓中测量的毛细血管压力平均为35毫米汞柱。平均体循环动脉压为124毫米汞柱。牙髓内的总血管压力降仅占体循环动静脉总压力差的20%。因此，控制牙髓血流的血管阻力只有五分之一位于牙髓本身内部。这意味着猫牙髓中的血流可能受牙髓外机制的影响。在牙龈中仅测量了小静脉压力，其平均为19毫米汞柱。
