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目的探讨安氏Ⅱ1类错畸形垂直颅面结构变化与嚼肌肌电活动的关系。方法选取31例安氏Ⅱ1类错女大学生(高角8例、均角13例、低角10例)和5例正常均角型女大学生。用Keypoint四道数字化肌电图仪同步记录姿势位、最大紧咬位、最大前伸位时嚼肌的肌电活动,比较嚼肌肌电活动差异。结果姿势位时,嚼肌肌电活动均无明显差别;最大紧咬位时安氏Ⅱ1类错均角组肌电活动低于正常(t=2.38,P<0.05),最大前伸位时安氏Ⅱ1类错均角组的嚼肌的肌电活动显著高于正常(t=2.51,P<0.05);最大紧咬位时安氏Ⅱ1类错高角组嚼肌的肌电幅值低于均角组和低角组(F=7.19,q=5.35、3.47,P<0.05);最大前伸位时安氏Ⅱ1类错高角组嚼肌肌电活动较低角组弱(F=9.83,q=4.78,P<0.05)。结论不同垂直颅面结构安氏Ⅱ1类错的嚼肌肌电活动有所不同;嚼肌的肌电活动与颅面结构有关。
Objective To investigate the relationship between the changes of vertical craniofacial structure and the myoelectric activity of Class Ⅱ division 1 malocclusion. Methods 31 female college students with Class Ⅱ 1 malocclusion (8 cases with high angle, 13 cases with average angle, 10 cases with low angle) and 5 normal-angle female college students were selected. Keypoint four digitized electromyographs were used to record the myoelectric activity of the chewing muscles synchronously, and to compare the difference of electromyographic activities of the chewing muscles. Results There was no significant difference in the myoelectric activities between the position of posture and the position of maxillary cleft. The myoelectric activity of Angle Ⅱ 1 group was lower than that of normal group (t = 2.38, P <0.05) The myoelectric activity of the chewing muscle of classⅡ1 was significantly higher than that of the normal group (t = 2.51, P <0.05); the EMG amplitude of chewing muscle of class Ⅱ 1 malocclusion was lower than that of the maxillary clenching position (F = 7.19, q = 5.35, 3.47, P <0.05). In the maximal extensional position, the EMG activity in the Angle Ⅱ 1 malocclusion group was weaker (F = 9.83, q = 4.78, P <0.05). Conclusions The myoelectric activities of different types of malocclusion in Class Ⅱ 1 malocclusion with different vertical craniofacial structures are different. The myoelectric activities of the chewing muscles are related to the craniofacial structures.