Influence of changes in microcirculation on the excitability of the sensory unit in the tooth of the cat.
Influence of changes in microcirculation on the excitability of the sensory unit in the tooth of the cat.
复制标题
微循环变化对猫牙齿感觉单元兴奋性的影响。
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
D. Scott
中科院分区：
文献类型：
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作者：
L. Edwall;D. Scott
对麻醉猫的犬齿同时测定放射性碘化物消失率（k 值）和牙本质腔的感觉神经脉冲频率。通过直接交感神经刺激或热刺激获得反映牙髓微循环变化的k值变化。交感神经刺激降低了 k 值并诱导神经脉冲频率的初始增加。在最大交感神经刺激期间，脉冲频率最初增加，随后明显降低。加热会增加 k 值和脉冲频率，而冷会降低 k 值并导致神经脉冲频率最初增加，然后减少。当 k 值降低时，在最大交感神经刺激期间叠加的热刺激不足以引起感觉神经脉冲频率的明显增加。有人建议，牙齿中感觉单元的兴奋性受到牙髓微循环变化的强烈调节，牙髓微循环的变化是由例如交感血管收缩纤维的刺激引起的。
Simultaneous determinations of radioactive iodide disappearance rate (k-value) and sensory nerve impulse frequency from dentinal cavities were performed on canine teeth of anesthetized cats. Changes in k-value reflecting changes in pulpal microcirculation were obtained by direct sympathetic nerve stimulation or by thermal stimulation. Sympathetic nerve stimulation re duced the k-value and induced an initial increase in nerve impulse frequency. During maximal sympathetic nerve stimulation this initial increase was followed by a marked depression in impulse frequency. Application of heat increased k-value as well as impulse frequency, while cold reduced k-value and induced an initial increase in nerve impulse frequency followed by a decrease. Thermal stimulation superimposed during maximal sympathetic stimulation, when k-value was depressed, was inadequate to evoke an appreciable increase in sensory nerve in pulse frequency. It is suggested that the excitability of sensory units in the tooth is strongly modulated by changes in pulpal microcirculation induced by, for example, stimulation of sympathetic vasoconstrictor fibres.