Brodin P, Fløystrand F, Orstavik J
Department of Physiology and Biochemistry, University of Oslo, Norway.
J Oral Rehabil. 1991 Jul;18(4):327-35. doi: 10.1111/j.1365-2842.1991.tb00064.x.
The characteristics of the masseter reflex evoked by tapping a maxillary incisor were compared with the reflex pattern evoked by tapping a corresponding denture tooth after insertion of an immediate denture. Up to three inhibitory phases (I-1, I-2 and I-3), followed by excitation, were found on an averaged EMG. The tapping force threshold for the early inhibitory phase was lower than for the late phases. The pattern of the reflex was generally the same before and after insertion of the denture, but the threshold values increased. After insertion of the denture, the threshold for I-1 increased from 1 +/- 0.3N to 2.2 +/- 0.4N, the threshold for I-2 increased from 2.4 +/- 0.8N to 3.8 +/- 0.9N, and the threshold for I-3 increased from 5.1 +/- 0.6N to 8.3 +/- 0.9N. The latency period for I-1 also increased from 12.3 +/- 0.5 ms to 13.1 +/- 0.3 ms after insertion of the denture. After relining, the threshold for evoking I-1 decreased from 2.7 +/- 1.2N to 1.2 +/- 0.6N. It was assumed that the mechanoreceptors situated in the mucosa under the denture base could take over the functional role of the periodontal mechanoreceptors for evoking the masseter reflex during tapping, and that these afferents probably had connections to the same interneurones.
比较了轻敲上颌切牙诱发的咬肌反射特征与即刻义齿戴入后轻敲相应义齿牙诱发的反射模式。在平均肌电图上发现，多达三个抑制期（I-1、I-2和I-3），随后是兴奋期。早期抑制期的轻敲力阈值低于后期。义齿戴入前后反射模式总体相同，但阈值升高。义齿戴入后，I-1的阈值从1±0.3N增加到2.2±0.4N，I-2的阈值从2.4±0.8N增加到3.8±0.9N，I-3的阈值从5.1±0.6N增加到8.3±0.9N。义齿戴入后，I-1的潜伏期也从12.3±0.5毫秒增加到13.1±0.3毫秒。重衬后，诱发I-1的阈值从2.7±1.2N降至1.2±0.6N。据推测，位于义齿基托下方黏膜中的机械感受器在轻敲过程中可以取代牙周机械感受器在诱发咬肌反射中的功能作用，并且这些传入神经可能与相同的中间神经元有联系。
