Effect of posture and head position on mandibular position and jaw function

姿势和头部位置对下颌位置和颌功能的影响

• 批准号: 15592170
• 负责人: IKEDA Koichi
• 金额: $ 1.86万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15592170/
• 关键词: Head posture; Mandibular position; Suprahyoid muscles; Electromyogram; Biting force; 姿勢; 前方頭位

Introduction : Head posture effects on craniofacial morphology, and it is hypothesized that soft-tissue stretching by changes in head posture effects on neuromuscular system in jaw and head-neck regions. In this study, effect of head posture on mandibular rest position, jaw-neck muscles' activity and position of chin's skin was investigated.Subjects and methods : The subjects (ten adult males) sat on the chair, and head was held extended, protracted and rotated to right side for 3 seconds respectively after natural head position for 3 seconds keeping mandibular rest position. The head position, madibular rest position, electromyograms in right and left sides of sternocleidomastoid, anterior digastric and masseter muscles and position of chin's skin were recorded.Results : Postural activity was small during natural head position. When head was held extended keeping mandibular rest position, postural activity significantly increased in sternocleidomastoid, anterior digastric and right ma … More sseter muscles, and mandibular rest position and position of chin's skin inferiorly sifted compared with those during natural head position.When head was held protracted keeping mandibular rest position, postural activity significantly increased in left masseter muscle, and mandibular rest position scarcely sifted compared with those during natural head position.When head was held rotated to right side keeping mandibular rest position, postural activity significantly increased in sternocleidomastoid and left anterior digastric muscles, and mandibular rest position sifted to left side and upward compared with those during natural head position.Discussions : These findings indicate that head posture effects on mandibular position, jaw-neck muscles' activity and position of chin's skin. The results of postural muscle activity suggest that neuromuscular system in jaw and head-neck regions is modulated to keep mandibular rest position according to head position. The increased postural activity in anterior digastric muscle may cause the sift of mandibular rest position to opposite direction to that of head movement. Less

简介：头位对颅面形态有影响，并推测头位改变所引起的软组织牵拉对颌部和头颈部的神经肌肉系统有影响。本研究旨在探讨头部姿势对下颌静息位、颌颈部肌肉活动和颏部皮肤位置的影响，对象和方法：受试者（10名成年男性）坐在椅子上，自然头位保持下颌静息位3s后，分别保持头伸直、头伸直和头向右旋转3s。记录头位、下颌静息位、左右两侧胸锁乳突肌、二腹肌前肌、咬肌电及颏部皮肤位置。当头部保持下颌静止位时，胸锁乳突肌、二腹肌前肌和右侧肌群的姿势活动显著增加 ...更多信息 结果表明，在头位时，左咬肌的姿势活动明显增加，而下颌静息位时左咬肌的姿势活动与头位时相比无明显变化，头位时左咬肌的姿势活动与头位时左咬肌的姿势活动相比无明显变化。结论：头位对下颌骨位置、颌颈部肌肉活动和颏部皮肤位置有影响。姿势性肌肉活动的结果表明，下颌和头颈部的神经肌肉系统是根据头部位置来调节的，以保持下颌的休息位置。二腹肌前肌的姿势性活动增加可能导致下颌静止位向与头部运动方向相反的方向偏移。少