权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The influence of clenching on head posture and body equilibrium

紧握对头部姿势和身体平衡的影响

基本信息

批准号：
13672048
负责人：
ISHIJIMA Tsutomu
金额：
$ 2.37万
依托单位：
HEALTH SCIENCES UNIVERSITY OF HOKKAIDO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13672048/
关键词：
Clenching Head Posture Body Sway Occlusion Body Equilibrium 頚部筋咬合支持

项目摘要

The purpose of this study was to elucidate the relationship among teeth clenching, head posture and body equilibrium.Results were as follows,In comparison to the rest mandibular position, neck was flexed anteriorly in the VMC condition. In the condition of unilateral occlusal support, neck was bent laterally to the occlusal support side. Positive correlation was found between the asymmetry index of the jaw closing muscles and the sternocleidomastoid muscle under both the eyes-closed condition (r=0.57, p<0.05) and the eyes-opened condition (r=0.78, p<0.05). Positive correlation was found between the asymmetry index of the sternocleidomastoid muscle and the angle of the lateral bending (r=0.43, p<0.05). From these results, it was suggested that there is a close relationship between occlusion and head posture.Against the impact load disturbing the body balance, cooperative movement between the head and body was observed during the dynamic event in 10%, 50%, and 100%VMC and RP. From the analysis of head movement, the maximum angle of lateral bending and rotation in RP was statistically greater than those in 10%, 50% and 100%VMC (p<0.05). From the analysis of head movement and body sway, total locus length in RP was statistically greater than those in 10%, 50% and 100%VMC (p<0.05). From the analysis of EMG activity, as the clenching force increased, the measurement of sternocleidomastoid muscle activity statistically increased (p<0.05). It is speculated from these results that the teeth clenching suppresses the head movement and body sway during the dynamic event. This speculation is supported by previous studies that activities of sternocleidomastoid muscles are synchronized to activities of jaw closing muscles during VMC.It is concluded that stomatognathic function and body equilibrium have an interdependent relationship.

本研究的目的是阐明咬牙、头部姿势和身体平衡之间的关系。结果如下，与休息下颌位置相比，VMC 状态下颈部向前弯曲。在单侧咬合支撑的情况下，颈部向咬合支撑侧横向弯曲。无论是闭眼状态（r=0.57，p<0.05）还是睁眼状态（r=0.78，p<0.05），闭颌肌和胸锁乳突肌的不对称指数均呈正相关。胸锁乳突肌不对称指数与侧弯角度呈正相关（r=0.43，p<0.05）。从这些结果来看，表明咬合和头部姿势之间存在密切关系。针对扰乱身体平衡的冲击载荷，在 10%、50% 和 100%VMC 和 RP 的动态事件期间观察到头部和身体之间的协作运动。从头部运动分析来看，RP组的最大侧弯和旋转角度统计上大于10%、50%和100%VMC组（p<0.05）。从头部运动和身体摇摆的分析来看，RP 中的总轨迹长度在统计上大于 10%、50% 和 100%VMC 中的总轨迹长度（p<0.05）。从肌电图活动分析来看，随着握紧力的增加，胸锁乳突肌活动的测量值统计上增加（p<0.05）。从这些结果推测，咬紧牙关抑制了动态事件期间的头部运动和身体摇摆。这一推测得到了先前研究的支持，即VMC期间胸锁乳突肌的活动与下颌闭合肌的活动同步。得出的结论是，口颌功能和身体平衡具有相互依赖的关系。