协调咀嚼下颌运动的舌侧推运动的运动学：前-后投影视频透视研究。
Kinematics of lateral tongue-pushing movement in coordination with masticatory jaw movement: An anteroposterior projection videofluorographic study.
机构信息
Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America; Division of Dysphagia Rehabilitation, Department of Human Biology and Pathophysiology, School of Dentistry, Health Sciences University of Hokkaido, Tobetsu, Ishikari, Hokkaido, Japan; Department of Speech-Language-Hearing therapy, School of Rehabilitation Sciences, Health Sciences University of Hokkaido, Tobetsu, Ishikari, Hokkaido, Japan.
Department of Oral Health Sciences for Community Welfare, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima, Tokyo, Japan.
出版信息
Physiol Behav. 2023 Oct 15;270:114315. doi: 10.1016/j.physbeh.2023.114315. Epub 2023 Aug 1.
OBJECTIVE
During the mastication of solid food, the tongue pushes the bolus laterally to place it onto occlusal surfaces as the jaw is opened. This movement is referred to as tongue-pushing (TP). TP has an important role in efficient chewing, but its kinematic mechanisms remain unclear. The present study quantified the kinematics of TP and its coordination with masticatory jaw movements.
METHODS
Videofluorography (VFG) in anteroposterior projection was recorded while 14 healthy young adults ate 6 g each of cookies and meat. Small lead markers were glued to the tongue surface (left, right, and anterior) and buccal tooth surfaces (upper molars and lower canines). The position of the tongue and lower canine markers relative to the upper occlusal plane was quantified with Cartesian coordinates, using the right upper molar as the origin. Jaw motion during chewing was divided into TP and Non-TP cycles, based on the lateral movement of the food and tongue markers. The side of the jaw that compressed food particles was defined as the working side, while the other side was termed the balancing side. Horizontal and vertical displacements of tongue and jaw markers were compared between TP and Non-TP cycles, as well as between food types.
RESULTS
The mediolateral displacement of all tongue markers was significantly larger in TP than in Non-TP cycles. Vertical displacement was also significantly greater in TP than in Non-TP cycles for the anterior and working side tongue markers. TP cycles occurred more frequently with meat-chewing than with cookie-chewing.
CONCLUSION
TP is accomplished by rotation and lateral movements of the tongue surface on the working side and the anterior tongue blade, along with medial movement on the balancing side. These movements produce lateral shift and rotation of the tongue surface toward the working side in concert with jaw opening. Designing exercises to improve the strength of the lateral motion and rotation of the tongue body may be useful for individuals with impaired tongue function for eating and swallowing.
目的
在咀嚼固体食物时，舌头将食团推向侧面，以便在开口时将其置于咬合面上。这种运动称为舌推（TP）。TP 在有效咀嚼中起着重要作用，但其运动学机制尚不清楚。本研究量化了 TP 的运动学及其与咀嚼下颌运动的协调性。
方法
在前后位进行视频荧光透视（VFG）记录，14 名健康年轻成年人分别咀嚼 6 克饼干和肉。将小的铅标记粘贴到舌表面（左侧、右侧和前侧）和颊侧牙齿表面（上颌磨牙和下颌尖牙）上。使用右上颌磨牙作为原点，通过笛卡尔坐标量化舌和下颌标记相对于上咬合面的位置。根据食物和舌标记的侧向运动，将咀嚼过程中的下颌运动分为 TP 和非 TP 循环。被食物颗粒压缩的颌侧定义为工作侧，另一侧称为平衡侧。比较了 TP 和非 TP 循环以及不同食物类型之间舌和颌标记的水平和垂直位移。
结果
与非 TP 循环相比，所有舌标记的横向位移在 TP 中均显著更大。在前部和工作侧舌标记中，TP 中的垂直位移也明显大于非 TP 循环。与咀嚼饼干相比，咀嚼肉时 TP 循环更频繁。
结论
TP 通过工作侧舌表面和前舌叶的旋转和侧向运动以及平衡侧的内侧运动来完成。这些运动使舌表面向工作侧产生侧向移动和旋转，与下颌开口协同作用。设计锻炼以改善舌体侧向运动和旋转的强度可能对因进食和吞咽而受损的舌功能的个体有用。
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