Tryde G, Tallgren A, Mizutani H
Institute of Dental Prosthetics, Royal Dental College, Copenhagen, Denmark.
J Oral Rehabil. 1989 Mar;16(2):193-201. doi: 10.1111/j.1365-2842.1989.tb01333.x.
A longitudinal electromyographic (EMG) investigation was performed on thirty subjects provided with an immediate complete upper and a partial lower denture. Electromyographic recordings in maximal clench, light tapping and postural position were obtained from the anterior temporal and masseter muscles before final extractions and 7 weeks, 6 months, 1 year and 2 years after denture insertion. The maximal clench activity of the jaw closing muscles showed an average tendency to decrease upon insertion of the dentures, but thereafter significant increases in mean voltages were observed during the first year of denture wear. During the second year no significant changes in EMG clenching force were noted. At the 2-year stage most of the muscles showed significantly greater clench activity than at the post-insertion stage, but did not exceed the pre-extraction level. The jaw muscle activity in light tapping showed no significant mean changes during the observation period. The postural activity tended to decrease during the period of denture wear, the decrease being significant for some of the muscles at the 2-year stage.
对30名佩戴即刻全口上颌义齿和部分下颌义齿的受试者进行了纵向肌电图（EMG）研究。在最终拔牙前以及义齿植入后7周、6个月、1年和2年，从前颞肌和咬肌获取最大紧咬、轻叩和姿势位时的肌电图记录。义齿植入后，颌骨闭合肌的最大紧咬活动平均有下降趋势，但在义齿佩戴的第一年期间，观察到平均电压显著增加。在第二年，肌电图紧咬力没有显著变化。在2年阶段，大多数肌肉的紧咬活动比义齿植入后阶段显著增强，但未超过拔牙前水平。在观察期内，轻叩时的颌肌活动平均无显著变化。姿势活动在义齿佩戴期间有下降趋势，在2年阶段，部分肌肉的下降具有显著性。
