Mongini F, Tempia-Valenta G, Benvegnu G
J Prosthet Dent. 1986 May;55(5):638-49. doi: 10.1016/0022-3913(86)90047-8.
A computer-based system to assess mandibular movements and EMG masseter and temporal muscle activity during habitual mastication was applied to 12 healthy subjects and the chewing performance was tested with a standardized bolus of crisp bread. A Siemens Sirognatograph instrument was used to record mandibular movements while EMG signals were recorded with surface silver-silver electrodes. Software provided data of single chewing cycles in space and versus time, of mean mandibular displacement during opening and closing, mean velocity, and EMG activity. Clockwise and counterclockwise cycles were computed separately. The data obtained allow the following conclusions: Habitual mastication is a rhythmic event with different envelopes of motion that alternate characteristically in each subject. Each chewing cycle accomplishes several tasks but, depending on its envelope, is probably more oriented to a specific performance. A mean chewing cycle can be constructed for each individual. Its pattern depends on the distribution of different envelopes of motion that alternate during the masticatory sequence. During closure, a prevalently isotonic and a prevalently isometric phase of muscle contraction can be distinguished. Mean movement and EMG data for the whole group are not distributed at random, but according to a typical pattern. The system seems to be finalized to a well-balanced function and distribution of loads.
一种基于计算机的系统被应用于12名健康受试者，用于评估习惯性咀嚼过程中的下颌运动以及咬肌和颞肌的肌电图活动，并使用标准化的脆饼团测试咀嚼性能。使用西门子Sirognatograph仪器记录下颌运动，同时用表面银-银电极记录肌电图信号。软件提供了单个咀嚼周期在空间和时间上的数据、开合过程中的平均下颌位移、平均速度以及肌电图活动。顺时针和逆时针周期分别计算。所获得的数据得出以下结论：习惯性咀嚼是一种有节奏的活动，具有不同的运动包络，在每个受试者中交替出现具有特征性。每个咀嚼周期完成多项任务，但根据其包络，可能更侧重于特定的表现。可以为每个个体构建一个平均咀嚼周期。其模式取决于在咀嚼序列中交替出现的不同运动包络的分布。在闭合过程中，可以区分出肌肉收缩的主要等张相和主要等长相。整个组的平均运动和肌电图数据不是随机分布的，而是根据一种典型模式分布。该系统似乎最终实现了功能的良好平衡和负荷的分布。
