Raustia A M, Oikarinen K S
Department of Prosthetic Dentistry and Stomatognathic Physiology, University of Oulu, Finland.
Int J Oral Maxillofac Surg. 1994 Jun;23(3):180-4. doi: 10.1016/s0901-5027(05)80297-8.
The functioning of the masseter and anterior temporal muscles was assessed by electromyography in 18 patients before orthognathic surgery and 6 weeks, 3 months, 1 year, and 2 years afterwards. Electromyogram (EMG) recordings were made during maximal bite in intercuspal position and chewing. The mean electric activity in the masseter and anterior temporal muscles decreased markedly 6 weeks after surgery but increased clearly for 1 year in both functions. Only a slight further increase was observed at 2-year follow-up during chewing, but not during maximal bite in intercuspidation. The mean changes in electric activity increased more clearly in patients with hyperplastic mandible than in patients with hypoplastic mandible and in those with long shift of the mandible. The same finding was also more visible in men and older patients than in women and younger patients.
通过肌电图对18例正颌手术患者术前以及术后6周、3个月、1年和2年时的咬肌和颞前肌功能进行评估。在牙尖交错位最大咬合力和咀嚼过程中进行肌电图（EMG）记录。术后6周时，咬肌和颞前肌的平均电活动明显下降，但在两种功能中均在1年内明显增加。在2年随访时，咀嚼过程中仅观察到轻微进一步增加，但在牙尖交错位最大咬合力时未观察到。与下颌发育不全患者以及下颌移位较长的患者相比，下颌增生患者的电活动平均变化增加更为明显。在男性和老年患者中这一发现也比女性和年轻患者中更明显。
