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，但最多的是对下颚运动的研究。在咀嚼过程中，舌头和颊粘膜的运动配合下颚的运动。因此，我们分析了这种运动，以便利用咀嚼过程中皮肤的运动来评估咀嚼功能。我们得出以下结论：(l)超过95%的口腔周围软组织运动可以通过PCA通过前三个PCs表达。(2)第1、3期牙周软组织与下颌骨的运动密切相关。(3)咀嚼过程中口腔周围软组织的运动是空间上、时间上等重复的稳定运动，与下颌运动的节奏相同，在时间上与下颌运动配合。(4)健康个体咀嚼时下面部皮肤运动的周期节律在咀嚼侧和咀嚼侧之间无显著差异。此外，咀嚼路径和运动方向的相似性在每个咀嚼侧都是空间稳定的，并且在个体中两个咀嚼侧之间表现出镜像关系。

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.