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本实验研究了咀嚼过程中,从矢状方向上作用于切牙上的(牙合)力的方向对下颌运动和闭颌肌肉活动可能产生的影响。共选择10名有1～2个右上切牙反(牙合)的健康儿童作为研究对象(男4女6,治疗前平均年龄10岁5个月,标准差18个月)。每一受试者均接受平均疗程11.1月的正畸治疗。在矫治切牙反(牙合)前后,每一受试对象均在右侧咀嚼一片口香糖,并用K-5(InC)下颌运动描记仪及肌电仪同时记录下颌的运动及同侧颞肌后份和浅层嚼肌的肌电信号(用Beckman型成对的银表面电极,间隔10mm,沿肌纤维方向固定于肌肉表面,地线电极连干右腕部)。这些信号从5个信号通道
This study investigated the effect of the direction of the occlusal force acting on the incisors in the sagittal direction during mastication on mandibular and closed jaw muscle activity. A total of 10 healthy children with 1-2 upper right posterior incisors were enrolled in this study (4 males and 6 females, with an average age of 10 years and 5 months before treatment and a standard deviation of 18 months). Each subject received an average of 11.1 months of orthodontic treatment. Before and after orthodontic treatment, each subject chewed a piece of chewing gum on the right side. K-5 (InC) jaw motion recorder and electromyography were used to record the movement of the jaw and the ipsilateral temporalis muscle The EMG signals of the massecuite and shallow masseter muscle (silver surface electrodes paired with Beckman type, 10 mm apart, fixed to the muscle surface in the muscle fiber direction, and the ground electrode connected to the right wrist). These signals are from 5 signal channels