肌功能训练对高角开患者的咬肌肌电影响

Electromyography Changes of Massetermuscle in Adolescents with High Angle and Open Bite after Myofunctional Therapy

目的:研究青少年肌功能训练前后高角开咬肌在息止紧咬、吞咽和咀嚼运动中的肌电活动变化。方法:应用肌电图仪测量32例高角开青少年在单纯进行肌功能训练3个月前后的咬肌肌电活动,并进行比较分析。结果:训练后在最大紧咬和吞咽时,咬肌肌电活动均高于训练前(P<0.05或P<0.01),而且咬肌咀嚼周期总时程缩短(P<0.01),闭口相至食物粉碎相咬肌活动增强(P<0.01)。结论:经过3个月的咀嚼肌功能训练,在不同下颌运动状态下,高角开青少年咬肌收缩和咀嚼功能均有改善,提示肌功能训练有利于高角开患者的正畸治疗。

Objective： To investigate the electromyography changes of the massetermuscle （MM） after myofunctional therapy （MFT） during mandibular movement in adolescents with high angle and open bite. Methods： The electromyography activities of MM were recorded before and after 3 months MFT during mandibular movement in 32 open bite adolescents with high angle. Results： Muscular activity of MM in open bite adolescent with high angle was significantly stronger after MFT than that before MFT in maximum clenching and swallowing （P 〈 0.05 or P 〈 0.01 ）.The total duration of mastication cycle was decreased and the activity of MM was enhanced from closing phase to food comminuting phase after MFT （P 〈 0.01 ）. Conclusion： The electromyography activities of the MM during mandibular movement in adolescents with high angle and open bite are significantly improved after 3 months MFT. The myofunctional therapy has advantage for adolescents with high angle and open bite.