Sessle B J, Woodside D G, Bourque P, Gurza S, Powell G, Voudouris J, Metaxas A, Altuna G
University of Toronto, Ontario, Canada.
Am J Orthod Dentofacial Orthop. 1990 Sep;98(3):222-30. doi: 10.1016/S0889-5406(05)81599-9.
The electromyographic (EMG) activity of masticatory muscles was monitored longitudinally with chronically implanted EMG electrodes to determine whether functional appliances produce a change in postural EMG activity of the muscles. Preappliance and postappliance EMG levels in four experimentals that had been fitted with functional appliances were compared against the background of EMG levels in controls without appliances. The insertion of two types of functional appliance to induce mandibular protrusion was associated with a decrease in postural EMG activity of the superior and inferior heads of the lateral pterygoid, superficial masseter, and anterior digastric muscles; the decrease in the first three muscles was statistically significant. This decreased postural EMG activity persisted for approximately 6 weeks, with a gradual return toward preappliance levels during a subsequent 6-week period of observation. Progressive mandibular advancement of 1.5 to 2 mm every 10 to 15 days did not prevent the decrease in postural EMG activity.
采用长期植入的肌电图（EMG）电极纵向监测咀嚼肌的肌电活动，以确定功能性矫治器是否会引起肌肉姿势性肌电活动的变化。将佩戴功能性矫治器的4名受试者矫治前和矫治后的肌电水平，与未佩戴矫治器的对照组的肌电水平背景进行比较。插入两种类型的功能性矫治器以诱导下颌前突，与翼外肌上下头、咬肌浅层和二腹肌前腹的姿势性肌电活动降低有关；前三块肌肉的降低具有统计学意义。这种姿势性肌电活动的降低持续约6周，在随后6周的观察期内逐渐恢复到矫治前水平。每10至15天渐进性下颌前伸1.5至2毫米并不能阻止姿势性肌电活动的降低。
