Sood Sankalp, Kharbanda Om P, Duggal Ritu, Sood Mangla, Gulati Sheffali
Department of Orthodontics and Dentofacial Orthopedics, H.P. Government Dental College & Hospital, 171001, Shimla, H.P., India.
J Orofac Orthop. 2011 Nov;72(6):434-45. doi: 10.1007/s00056-011-0048-x. Epub 2011 Nov 30.
To evaluate long-term neuromuscular adaptation with the flexible fixed functional appliance.
Electromyography (EMG) was performed on 15 young, growing females with Class II Division 1 malocclusion treated with a flexible fixed functional appliance. Bilateral EMG activity from the anterior temporalis and masseter muscles was monitored longitudinally to determine changes in posture, swallowing, and maximum voluntary clenching during a 24-month observation period.
There was a significant decrease in EMG activity during saliva swallowing (p < 0.05) and maximum clenching (p < 0.05 at 3 months and p < 0.01 at 1 month after treatment); this persisted for up to 1 month but gradually returned to pre-appliance levels near the end of 6 months. It remained stable from then on until the end of the observation period (24 months).
The anterior temporalis and masseter muscles clearly responded to appliance therapy. The neuromuscular adaptation documented after 6 months of treatment remained stable over a 24-month observation period.
评估使用灵活固定功能矫治器后的长期神经肌肉适应性。
对15名使用灵活固定功能矫治器治疗的生长发育期Ⅱ类1分类错牙合年轻女性进行肌电图（EMG）检查。在24个月的观察期内，纵向监测颞肌前束和咬肌的双侧肌电图活动，以确定姿势、吞咽和最大自主紧咬时的变化。
唾液吞咽时肌电图活动显著降低（p < 0.05），最大紧咬时也显著降低（治疗后3个月时p < 0.05，1个月时p < 0.01）；这种情况持续长达1个月，但在6个月末逐渐恢复到矫治器治疗前的水平。从那时起直至观察期结束（24个月），其保持稳定。
颞肌前束和咬肌对矫治器治疗有明显反应。治疗6个月后记录到的神经肌肉适应性在24个月的观察期内保持稳定。
