Yamaguchi T, Komatsu K, Yura S, Totsuka Y, Nagao Y, Inoue N
Department of Special Clinic for Specific Disorders, Hokkaido University School of Dentistry, Sapporo, Japan.
Cranio. 1998 Oct;16(4):275-82. doi: 10.1080/08869634.1998.11746068.
There have been few reports analyzing the activity of the jaw-closing muscles after coronoidectomy performed on a patient with coronoid hyperplasia. This paper presents a case study using electromyograms (EMGs) to evaluate the effects of unilateral coronoidectomy on the activity of masseter and temporal muscles. The patient was a 25-year-old male whose maximal range of jaw opening was 24 mm. After coronoidectomy of the left region, the range improved to 43 mm. EMGs were recorded in the center of the masseter muscles and the anterior part of the temporal muscles during gum chewing. Preoperatively, no abnormal EMG activity was observed. Eight months after surgery, increase in the ratio of the bilateral temporal muscle activity and a decrease in the ratio of the right masseter muscle activity were observed, and the proportion of activity of jaw closing muscles was out of the normal range. Eighteen months after surgery, there was slight return to the preoperative EMG activity. It was concluded that unilateral coronoidectomy could result in EMG changes of masseter and temporal muscles with a gradual return.
关于对患有冠状突增生的患者进行冠状突切除术后，分析咬肌活动情况的报告很少。本文介绍了一项病例研究，该研究使用肌电图（EMG）来评估单侧冠状突切除术对咬肌和颞肌活动的影响。该患者为一名25岁男性，其最大张口范围为24毫米。左侧区域进行冠状突切除术后，张口范围改善至43毫米。在咀嚼口香糖期间，于咬肌中部和颞肌前部记录肌电图。术前，未观察到异常肌电图活动。术后八个月，观察到双侧颞肌活动比例增加，右侧咬肌活动比例降低，且咬肌活动比例超出正常范围。术后18个月，肌电图活动略有恢复至术前水平。得出的结论是，单侧冠状突切除术可导致咬肌和颞肌的肌电图变化，并会逐渐恢复。
