Tosello D O, Vitti M, Berzin F
Department of Morphology, Faculty of Odontology, Campinas University--Piracicaba, S.P., Brazil.
J Oral Rehabil. 1998 Nov;25(11):838-46. doi: 10.1046/j.1365-2842.1998.00322.x.
The function and the level of activity of the orbicularis oris (upper and lower), and of the mentalis muscles were verified electromyographically in resting position and in several movements and carried out in 18 children aged 8-12 years, divided into three groups: one with normal occlusion, and two with Class II division 1, with atypical swallowing and/or incompetent lips, who had received no orthodontic treatment. It was observed that, in a resting position with the lips separated, there was no activity in any of the muscles. When there was a contact of the lips, action potentials were recorded in the muscles studied, in those individuals with incompetent lips. In the movements of sucking either through a straw or a pacifier and the thumb, there were no differences among the groups. The incompetent lips group presented very marked muscle activity of the lower orbicularis oris and mentalis in the movement of sucking a lollipop. In deglutition of saliva, the orbicularis oris presented slight activity, and the mentalis, moderate. In deglutition of water, the mentalis presented very marked activity, whereas, the upper and lower orbicularis oris presented moderate and marked activities, respectively.
对18名8至12岁儿童的口轮匝肌（上、下）和颏肌的功能及活动水平进行了肌电图检查，这些儿童处于静息位以及进行多种动作时的情况，他们被分为三组：一组为正常咬合，两组为安氏II类1分类错牙合，伴有非典型吞咽和/或唇部功能不全，且未接受过正畸治疗。观察到，在唇部分开的静息位时，所研究的任何肌肉均无活动。当唇部接触时，在唇部功能不全的个体中，所研究的肌肉记录到动作电位。在通过吸管、安抚奶嘴或拇指吸吮的动作中，各组之间没有差异。唇部功能不全组在吸吮棒棒糖的动作中，口轮匝肌下部和颏肌呈现出非常明显的肌肉活动。在吞咽唾液时，口轮匝肌呈现轻微活动，颏肌呈现中度活动。在吞咽水时，颏肌呈现非常明显的活动，而上、下口轮匝肌分别呈现中度和明显的活动。
