Özen Ali Kağan, Ceylan İsmail
Department of Orthodontics, Kafkas University Faculty of Dentistry, Kars, Türkiye.
Department of Orthodontics, Atatürk University Faculty of Dentistry, Erzurum, Türkiye.
Acta Odontol Scand. 2025 Apr 22;84:182-190. doi: 10.2340/aos.v84.43408.
The aim of this study is to investigate short-term changes in the electromyographic (EMG) activity of masticatory muscles in individuals with skeletal Class III malocclusion undergo double-jaw orthognathic surgery.
In patients with skeletal Class III anomaly, EMG activity changes in the anterior temporalis and masseter muscles were measured before T0 and at 3 (T1) and 6 (T2) months after bimaxillary orthognathic surgery. Recordings were obtained using the 'MP100' device and circular Ag-AgCl electrodes during closure, clenching, chewing and swallowing. Data from 26 individuals (12 males, 14 females) with a mean age of 21.7 years were analysed using the Friedman test.
A significant decrease was observed in the right/left masseter muscles during clenching/chewing from T1 to T0 (right and left masseter clenching: p < 0.001, left masseter chewing: p < 0.01, right masseter chewing: p < 0.05), while a significant increase was noted in the right masseter's clenching function from T2 to T1 (p < 0.01). The EMG activity of the right anterior temporal muscle decreased during clenching at T1-T0 (p < 0.001), increased at T2-T1 (p < 0.05), and decreased during chewing/swallowing at T1-T0 (chewing: p < 0.001, swallowing: p < 0.05) and T2-T0 (p < 0.05). The left anterior temporal muscle showed decreased EMG activity during clenching at T1-T0 (p < 0.001), increased at T2-T1 (p < 0.05), and decreased during chewing at T1-T0 (p < 0.001). During swallowing, a decrease was observed at T2-T0 (p < 0.001).
Partial changes in EMG activity were observed during some functions in the 3-month period; however, no significant overall change was recorded in the 6-month period.
本研究旨在调查接受双颌正颌手术的Ⅲ类骨性错牙合患者咀嚼肌肌电图（EMG）活动的短期变化。
对于Ⅲ类骨性错牙合畸形患者，在双颌正颌手术前（T0）、术后3个月（T1）和6个月（T2）测量颞肌前束和咬肌的肌电图活动变化。在闭口、紧咬、咀嚼和吞咽过程中，使用“MP100”设备和环形银-氯化银电极进行记录。采用Friedman检验分析了26名平均年龄为21.7岁的个体（12名男性，14名女性）的数据。
从T1到T0，紧咬/咀嚼时双侧咬肌肌电图活动显著降低（右侧和左侧咬肌紧咬：p < 0.001，左侧咬肌咀嚼：p < 0.01，右侧咬肌咀嚼：p < 0.05），而从T2到T1，右侧咬肌的紧咬功能显著增强（p < 0.01）。右侧颞肌前束在T1 - T0紧咬时肌电图活动降低（p < 0.001），在T2 - T1时升高（p < 0.05），在T1 - T0咀嚼/吞咽时降低（咀嚼：p < 0.001，吞咽：p < 0.05）以及在T2 - T0时降低（p < 0.05）。左侧颞肌前束在T1 - T0紧咬时肌电图活动降低（p < 0.001），在T2 - T1时升高（p < 0.05），在T1 - T0咀嚼时降低（p < 0.001）。在吞咽时，T2 - T0时降低（p < 0.001）。
在3个月期间，某些功能中观察到肌电图活动有部分变化；然而，在6个月期间未记录到显著的总体变化。
