摘要
目的 研究下颌功能对头颈肩部功能的影响 ,比较正常人和下颌偏斜错者下颌息止位及下颌运动时头颈肩部肌的活动情况。方法 用肌电积分值记录分析正常人和下颌偏斜错者各10例的下颌息止位和各种运动时颞肌前后腹 ,胸锁乳突肌 ,斜方肌的肌电活动情况。结果 息止位时各肌均有持续肌电活动。下颌运动时 ,颞肌前后腹和胸锁乳突肌活动增加。在不伴随咬合的下颌运动时 ,下颌偏斜者的颞肌前后腹肌电活动强度大于正常人 (15 0 % ) ,而在伴有咬合运动时 ,小于正常人 (5 0 % )。各咬合状态下肌电活动和息止位时肌电活动的差异率小于正常人。斜方肌无论在何种状态下均有持续的肌电活动 ,活动量是正常人的 171% ,在伴随咬合时兴奋性增强。除下颌侧方运动外 ,患者同名称肌的左右侧活动的平均差异率 (2 1% )大于正常人 (8% )。结论 颞肌前后腹 ,胸锁乳突肌和斜方肌均参与了下颌息止位的维持和下颌运动的实现。下颌偏斜畸形者的肌活动较正常人有改变 ,协调性和可调性较正常人差 ,斜方肌等头颈肩部肌持续兴奋 ,容易引起肌疲劳。
Objective To study the activities of head, neck and upper trunk muscles during mandibular movements in healthy adults and mandibular asymmetry patients. Methods Electromyographic integrogram was used to record and analyze the electromyographic activities of the anterior temporal (Ta), posterior temporal (Tp), sternocleidomastoid (SCM), and trapezius (TRAP) muscles in rest position and during mandibular movement among 10 normal adults and 10 mandibular asymmetry patients. Results All the four muscles showed constant electromyographic activities when the mandible was in the rest position. The activities of Ta, Tp, and SCM muscles increased with protrusion of mandible, mouth opening, tapping, maximum clenching, and chewing. The activities of Ta and Tp muscles of the patients were 1.7 times greater than that of the normal adults during mandibular movement without occlusion, and were weaker by 50% during mandibular movement with occlusion. The difference between electromyographic activities during mandibular movement and in rest position was less among patients than among normal adults. The TRAP muscle of the patients showed constant electromyographic activities with the activity volume nearly 1.8 times that of the normal adults. The difference between the muscle and its namesake at the opposite side was greater among the patients (21%) than among the normal adults (8%). Conclusion All the four muscles participate in the maintenance of rest position of mandible and the realizatiobn of mandibular movements. The coordination of muscular activities among mandibular asymmetry patients is poorer than that among normal adults.
出处
《中华医学杂志》
CAS
CSCD
北大核心
2002年第6期403-406,共4页
National Medical Journal of China
基金
中华医学基金专项人才基金资助项目 (CMB)
