Measurement of jerk-cost using a triaxial piezoelectric accelerometer for the evaluation of jaw movement smoothness
Measurement of jerk-cost using a triaxial piezoelectric accelerometer for the evaluation of jaw movement smoothness
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DOI：
10.1111/j.1365-2842.2010.02085.x
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发表时间：
2010-08-01
影响因子：
2.9
通讯作者：
Wakabayashi, N.
中科院分区：
文献类型：
--
作者：
Minami, I.;Oogai, K.;Wakabayashi, N.
Jerk-cost作为评价颌骨运动平稳性的指标，已被用于评价牙缺失和错牙合畸形患者的咀嚼功能。因此，急动成本测量系统不能确定每个咀嚼阶段随时间的急动成本。本研究的目的是（i）开发一种新的方法，用于测量瞬时的冲击成本的下颌运动使用一个小型的三轴压电加速度计和（ii）测试的假设，即最低的平滑度是在下颌打开阶段。将加速度计贴在每个受试者的颏部皮肤上。分析了5名正常有齿受试者（n = 5）在咀嚼口香糖期间的下颌垂直位移、加速度、急动和急动成本的时间差随时间的变化。该系统揭示了相当高的值（0中心点80-0中心点88）的组内相关系数的内部检查者，内部检查者，和测试-重测的一致性。在所有受试者中，在每个咀嚼周期的开口阶段，当牙龈与牙齿分离时，观察到最高的急动成本;在整个咀嚼周期的牙尖交错阶段，观察到最低的急动成本，从而证实了假设。在打开、闭合和牙尖交错咀嚼阶段之间观察到显著差异（N = 5，P = 0，中心点007）。在这项研究中使用的平滑度测量系统评估咀嚼周期中每个咀嚼阶段的瞬时平滑度。该系统可以作为一种诊断工具，以评估在一般牙科实践中的下颌运动的平滑度。
P>Jerk-cost as a measure of jaw movement smoothness has been used to evaluate the masticatory function of patients with tooth loss and malocclusion. Jerk-cost measuring systems have thus far been unable to determine the jerk-cost of each chewing phase over time. The purposes of this study were (i) to develop a new method for measuring momentary jerk-cost of the jaw movement using a small triaxial piezoelectric accelerometer and (ii) to test the hypothesis that the lowest smoothness is seen during jaw-opening phase. The accelerometer was attached to the skin of the mentum of each subject. Vertical jaw displacement, acceleration, the jerk, and the time differential of jerk-cost during gum chewing were analysed as a function of time in five normal dentate subjects (n = 5). The system revealed intra-class correlation coefficients of intra-examiner, inter-examiner, and test-retest consistency of substantially high values (0 center dot 80-0 center dot 88). In all subjects, the highest jerk-cost was observed in the opening phase of each chewing cycle when the gum was parting from the teeth; the lowest jerk-cost was observed in the intercuspal phase throughout the chewing cycle, thus confirming the hypothesis. Significant differences were observed between the opening, closing, and intercuspal chewing phases (N = 5, P = 0 center dot 007). The smoothness measurement system used in this study evaluated the momentary smoothness of each chewing phase in the masticatory cycle. The system may serve as a diagnostic tool to evaluate the smoothness of the jaw movement in general dental practice.