Aars H
Arch Oral Biol. 1983;28(6):497-500. doi: 10.1016/0003-9969(83)90180-2.
The influence of the sympathetic innervation of periodontal blood vessels on the responses of the upper incisor tooth to sudden changes in mean arterial pressure was studied in 15 anaesthetized rabbits. Changes in axial position of the tooth were measured by ultrasonic transit time technique. With intact sympathetic nerves, the tooth showed small, if any, intrusive movements in response to 6-42 mm Hg reductions in arterial pressure evoked by stimulation of the aortic baroreceptor nerve. When exposed to similar periods of hypovolaemic hypotension, the intrusions were, on an average, 1 micron larger (p less than 0.01). After bilateral sectioning of the cervical sympathetic nerves, tooth intrusions in response to both types of pressure reduction became more marked, as did the extrusive movements evoked by abrupt increases in aortic pressure (produced by inflation of intra-aortic balloon). After sympathectomy, a 19 +/- 6 mm Hg rise in pressure caused extrusions of 6 +/- 3 microns, or 2 microns more than before the sympathectomy (p less than 0.01). The results suggest that the activity in sympathetic nerves to periodontal blood vessels may be inhibited by central nervous mechanisms and that the sympathetic innervation of the periodontal vasculature serves to minimize changes in tooth position brought on by sudden alterations in arterial pressure.
在15只麻醉兔身上研究了牙周血管的交感神经支配对上门齿对平均动脉压突然变化反应的影响。采用超声渡越时间技术测量牙齿轴向位置的变化。在交感神经完整的情况下，牙齿对刺激主动脉压力感受器神经引起的动脉压降低6 - 42毫米汞柱的反应，如果有反应的话，表现为微小的侵入性运动。当暴露于类似的低血容量性低血压时期时，侵入平均增加1微米（p小于0.01）。双侧切断颈交感神经后，对两种类型的压力降低的牙齿侵入以及主动脉压力突然升高（通过主动脉内球囊充气产生）引起的突出运动都变得更加明显。交感神经切除术后，压力升高19±6毫米汞柱会导致6±3微米的突出，比交感神经切除术前多2微米（p小于0.01）。结果表明，牙周血管交感神经的活动可能受到中枢神经机制的抑制，并且牙周血管系统的交感神经支配有助于最小化动脉压突然变化引起的牙齿位置变化。
