Manns A E, Garcia C, Miralles R, Bull R, Rocabado M
Department of Physiology and Biophysics, Faculty of Medicine, University of Chile.
Cranio. 1991 Jul;9(3):212-9. doi: 10.1080/08869634.1991.11678369.
The effect of anesthetic blocking of the periodontal afferents of the canine teeth was studied in order to determine its influence on any changes in the jaw elevation activity. Unilateral integrated EMG recordings were made of the masseter and anterior temporal muscles during maximal voluntary clenching in centric occlusion and laterotrusive position with canine contact. After anesthetic blocking of the periodontal afferents of one or both ipsilateral canines, a significant increase was observed of the EMG activity of both jaw elevator muscles studied, in centric occlusion as well as with canine contact. The elevator activity increase was of a greater magnitude when antagonistic canines were anesthetized. These findings thus support the hypothesis that high threshold periodontal receptors exert an inhibitory effect on jaw elevator muscular activity.
为了确定麻醉阻断犬齿牙周传入神经对下颌抬高活动变化的影响，对其进行了研究。在正中咬合和有犬齿接触的侧方运动位进行最大自主紧咬时，对咬肌和颞前肌进行单侧肌电图综合记录。在同侧一颗或两颗犬齿的牙周传入神经被麻醉阻断后，发现在正中咬合以及有犬齿接触时，所研究的两块下颌升肌的肌电图活动均显著增加。当拮抗侧犬齿被麻醉时，升肌活动增加的幅度更大。因此，这些发现支持了高阈值牙周感受器对下颌升肌活动具有抑制作用这一假说。
