Effect of the Shortened Dental Arch on movement smoothness during chewing

本研究的目的是确定是否实验差异的食物团的位置有咀嚼效率和下颌运动的平滑度的影响。用加速度计测量咀嚼过程中的急动速度，评价下颌运动的平滑性，并记录咀嚼双色口香糖时的加速度，以此评价咀嚼效率。咀嚼在两种条件下进行：后咀嚼和前咀嚼。使用Wilcoxon符号秩检验（双尾）比较前后咀嚼的Jerk成本和咀嚼效率。受试者在前咀嚼期间的咀嚼效率显著低于后咀嚼期间（P =0.0051）。在开放期（P = 0.25）或闭合期（P = 0.42），前后位条件之间的颠簸成本无显著差异。

The aim of this study was to determine whether experimental differences in food bolus location had an effect on masticatory efficiency and jaw movement smoothness. Jaw movement smoothness was evaluated by measuring jerk-cost with an accelerometer, and acceleration was recorded during chewing on two-colour chewing gum, which was used to assessed masticatory efficiency. Chewing was performed under two conditions: posterior chewing and anterior chewing. Jerk-cost and masticatory efficiency were compared between anterior and posterior chewing with the Wilcoxon signed rank test (two-tailed). Subjects chewed significantly less efficiently during anterior chewing than during posterior chewing (P =0.0051). There was no significant difference in jerk-cost between anterior and posterior conditions in the opening phase (P = 0.25), or closing phase (P = 0.42).