Woźniak Krzysztof, Piątkowska Dagmara, Szyszka-Sommerfeld Liliana, Buczkowska-Radlińska Jadwiga
Department of Orthodontics, Pomeranian Medical University of Szczecin, Szczecin, Poland.
Department of Conservative Dentistry, Pomeranian Medical University of Szczecin, Szczecin, Poland.
Med Sci Monit. 2015 Jan 20;21:246-53. doi: 10.12659/MSM.893111.
Electromyography (EMG) is the most objective tool for assessing changes in the electrical activity of the masticatory muscles. The purpose of the study was to evaluate the tone of the masseter and anterior temporalis muscles in growing children before and after 6 months of treatment with functional removable orthodontic appliances.
MATERIAL/METHODS: The sample conisted of 51 patients with a mean age 10.7 years with Class II malocclusion. EMG recordings were performed by using a DAB-Bluetooth instrument (Zebris Medical GmbH, Germany). Recordings were performed in mandibular rest position, during maximum voluntary contraction (MVC), and during maximum effort.
The results of the study indicated that the electrical activity of the muscles in each of the clinical situations was the same in the group of girls and boys. The factor that determined the activity of the muscles was their type. In mandibular rest position and in MVC, the activity of the temporalis muscles was significantly higher that that of the masseter muscels. The maximum effort test indicated a higher fatigue in masseter than in temporalis muscles.
Surface electromyography is a useful tool for monitoring muscle activity. A 6-month period of functional therapy resulted in changes in the activity of the masticatory muscles.
肌电图（EMG）是评估咀嚼肌电活动变化最客观的工具。本研究的目的是评估在使用功能性可摘矫治器治疗6个月前后，生长发育期儿童咬肌和颞肌前束的肌张力。
材料/方法：样本包括51例平均年龄10.7岁的安氏II类错牙合患者。使用DAB蓝牙仪器（德国Zebris Medical GmbH公司）进行肌电图记录。记录在下颌休息位、最大自主收缩（MVC）和最大用力时进行。
研究结果表明，在每种临床情况下，女孩组和男孩组肌肉的电活动相同。决定肌肉活动的因素是其类型。在下颌休息位和MVC时，颞肌的活动明显高于咬肌。最大用力测试表明，咬肌比颞肌更容易疲劳。
表面肌电图是监测肌肉活动的有用工具。6个月的功能治疗导致咀嚼肌活动发生变化。
