Time series analyses on the mandibular and perioral soft tissue movement during the mastication

虽然对咀嚼运动的研究很多，但对下颌运动的研究最多。伴随着咀嚼运动的是舌和颊粘膜的运动，它们与下颌的运动是相互配合的。因此，我们分析了咀嚼过程中皮肤的运动，以便利用皮肤的运动来评价咀嚼功能。我们得出以下结论：(L)使用前三个PC，95%以上的口周软组织运动可以通过PCA表达。(2)下颌软组织与口周软组织的运动在第一、三个牙周区密切相关。(3)口周软组织在咀嚼过程中的运动是空间上和时间上等重复的稳定运动，其运动节奏与下颌运动一致，在时间上与下颌运动相互配合。(4)健康受试者在咀嚼过程中，双侧咀嚼时面下部皮肤运动的周期节律无显著差异。此外，这些运动的咀嚼路径和运动方向在每个咀嚼侧上的相似性在空间上是稳定的，并且在个体中两个咀嚼侧之间呈现镜像关系。

Though the research on the chewing movement is large in number, the most is the research on the jaw movement. The movement of tongue and buccal mucosa that cooperated for the lower jaw movement accompanies the mastication. So, we analyzed that movement in order to utilize the movement of the skin for the mastication function evaluation during mastication.We concluded the followings;(l) Over 95 % of perioral soft tissue movements can be expressed by PCA using the first three PCs. (2) The movements of mandibular and perioral soft tissue were closely related in the first and third PC. (3) The movements of perioral soft tissue during mastication are the equal repetition spatially and temporally stable movements, and move in the same accurate rhythm as mandibular movements and cooperate with mandibular movements temporally. (4) For movements of the lower face skin during mastication there were no significant differences in the cycle rhythms between the two chewing sides in individual healthy subjects. Moreover, the similarity of the chewing paths and motion directions of those movements were spatially stable on each chewing side and showed mirror-image relationships between the two chewing sides in individuals.