摘要目的 探讨肌电生物反馈与固定功能矫正在下颌后缩畸形的生长改良治疗中的作用.方法 选取30例青少年患者作为研究对象,随机分为实验组和对照组进行对比研究.两组患者均采用Forsus固定功能矫正与MBT直丝弓矫正联合应用,两组均对治疗前、中、后期各种状态下咀嚼肌群的肌电活动进行记录,应用肌电图评价其治疗效果.实验组的患者在功能治疗期间进行生物反馈治疗,将咀嚼肌群的肌电活动转变为患者可觉察到的视听信号,让患者在仪器的帮助下通过训练能在一定的范围内调节肌电活动,维持肌电活动的平衡.实验组的患者在进行固定功能矫正6周后开始进行生物反馈治疗,在仪器的帮助下对咀嚼肌进行10次的生物反馈治疗并在随后的时间让患者自行进行每天20 min的训练以有效维持咀嚼肌的肌电活动.结果 在功能治疗期间和治疗结束后进行持续的肌电生物反馈训练能调节咀嚼肌的肌电活动,能有效维持治疗期间和治疗后咀嚼肌的肌电活动的平衡,防止肌电活动的恢复引起髁突向后回位,维持治疗效果,反馈治疗前后咀嚼肌肌电活动维持不变(P＞0.05).结论 肌电生物反馈治疗能有效维持咀嚼肌的肌电活动,提高功能矫正的治疗效果和维持治疗效果的稳定.

abstractsObjective To study the effects of biofeedback combined with the fixed functional appliance in the modification of mandible in patients with Angle Class Ⅱ malocclusion and retruded mandible.Methods A Iotal of 30 orthodontic patients were divided into two groups,all patients with retruded mandible and normal maxilla,ANB>6°,aged from 9 years and three months to 14 years and 11 months.All patients were treated with Forsus fixed functional appliance combined with MBT straight-wire appliance.Muscular activity of the superficial masseter muscle before,during,and after treatment.was evaluated by assessing the average integrated eleetromyogram (EMG) .The biofeedback was performed during functional treatment in the study group,the muscular activity of the superficial masseter muscle was turned into the signal which can be read and seen by patients,and the patient can control the muscular activity of the superficial masseter muscle in a certain extent under the help of instrument.After 6 weeks fixed functional appliance treatment,the biofeedback treatment was performed in the study group with the help of instrument and trained for 10 times,and the patients could trained by themselves for 20 minutes everyday.Results The biofeedback treatment was able to regulate the muscular activity of the masseter muscle and prevent the return of muscle function and the tendency to seat the condyle back toward the fossa,maintain the treatment effect;after biofeedback treatment the decreased postural EMG activity in the masseter muscle was steady,but without statistical significance (P>0.05).Conclusion The biofeedback treatment can maintain the muscular activity of the masseter muscle effectively,enhance the effect of functional treatment and keep the stability of the mandibular position.