Predicting masticatory jaw movements from chin movements using multivariate linear methods.
Predicting masticatory jaw movements from chin movements using multivariate linear methods.
复制标题
使用多元线性方法根据下巴运动预测咀嚼下颌运动。
DOI：
10.1016/j.jbiomech.2004.09.013
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Lin,Dennis
中科院分区：
文献类型：
--
作者：
Gerstner,GeoffreyE;Lafia,Carmen;Lin,Dennis
之前，我们使用最大和最小位移、速度和加速度变量的双变量相关性来比较咀嚼下巴和下颌运动（J. Prosthet. Dent. 81 (1999) 179）。先前的这项研究代表了探索下巴包含有关下巴运动学的有用信息这一假设的第一步。目前的研究通过以下方式扩展了我们对咀嚼下巴和下巴运动之间关系的理解：（1）重建和评估下巴和下巴运动的更连续的轨迹，以及（2）执行多变量相关性比较沿着轨迹的离散点的下巴和下巴运动，以便深入了解咀嚼周期中下巴和下巴运动的耦合。结果表明，下巴和下颌的运动轨迹在横向、纵向和前后轴上视觉上相似。调整后的 R2 结果在横向、垂直和前后尺寸上的平均值分别为 0.74、0.78 和 0.89。在咀嚼周期内，下巴和下颌在横向和垂直维度上的运动之间的相关性最低发生在下颌相对闭合时，而下巴和下颌在前后维度上的运动之间的最低相关性发生在下颌从闭合位置打开时。结果表明，下巴和下巴的运动在质量上是相似的，并且下巴运动的多元线性模型可以解释至少 74% 的下巴运动变化。
Previously, we have used bivariate correlations of maximum and minimum displacement, velocity and acceleration variables to compare masticatory chin and jaw movements (J. Prosthet. Dent. 81 (1999) 179). This previous study represented a first step in exploring the hypothesis that the chin contained useful information regarding jaw kinematics. The current study extends our understanding of the relationship between masticatory chin and jaw movements by: (1) reconstructing and evaluating a more continuous trajectory of chin and jaw movements, and (2) performing multivariate correlations comparing chin and jaw movements at discrete points along the trajectory in order to gain insight into the coupling of chin and jaw movements during a chewing cycle. Results indicated that chin and jaw movement trajectories were visually similar in the lateral, vertical, and anteroposterior axes. The adjusted R2results in the lateral, vertical, and anteroposterior dimensions averaged 0.74, 0.78, and 0.89, respectively. Within chewing cycles, the lowest correlations between chin and jaw movements in the lateral and vertical dimensions occurred when the jaw was relatively closed, whereas the lowest correlations between chin and jaw movements in the anteroposterior dimension occurred while the jaw was opening from a closed position. The results indicated that jaw and chin movements were qualitatively similar and that at least 74% of the variation in jaw movements could be accounted for by multivariate linear models of chin movement.