The relation between equilibrium function and masticatory activity and neck muscle activity.

本研究的目的是探讨咬合状态的改变是否会对身体平衡产生影响。首先，研究了无牙颌患者在使用和不使用义齿时咬合支持的效果。第二，在正常牙合受试者中研究正畸分离弹性体对急性牙周疼痛的影响，并通过计算机动态姿势图评估身体平衡调节能力。1)感觉组织测试：通过系统系统地改变体感和视觉环境，并记录受试者的反应。在该测试期间，测力板和/或视觉环境可能会摇摆，从而使其移动以跟随患者的前后摇摆运动（摇摆参考系统）。摇摆参考系统将不准确的方向信息传递到眼睛、脚、关节和内耳以取消参考。2)运动控制测试：一系列的力板运动激发自动姿势反应。该测试包括负重对称性、反应速度（潜伏期）、反应强度和对称性，无牙颌患者戴全口义齿后，感觉组织平衡能力增强。这表明义齿支持对无牙颌患者感觉组织功能的维持具有重要作用。分离弹力带诱发牙周疼痛后，动态平衡功能无明显变化。

The Purpose of this study is to examine whether there exists any effect of alteration in occlusal condition on the body balance. First, the effect of occlusal support with and without prosthetic appliance in edetulous patients was examined. Second, the effect of acute periodontal pain derived by placing orthodontic separating elastics was investigated in human subjects with normal occlusion.Body balance adjustment capability was evaluated by means of computerized dynamic posturography. 1) Sensory Organization Test : Somatosensory and visual environments were altered systematically by the system, and the subject responses were recorded. During this test, force plate and/or visual environment may sway so that they move to follow the patient's anteroposterior sway movements(sway-referencing system). Sway-referencing system delivers inaccurate orientation information to the eye, feet and joints and inner ear to cancel the reference. 2) Motor Control Test : A series of force plate movement elicits automatic postural responses. This test includes the symmetry of weight bearing, the reaction speed(latency), the strength and symmetry of response.In edentulous patients, the capability of maintaining equilibrium about Sensory Organization Test increased when they were tested with complete dentures. This indicates contribution of occlusal support with prosthetic appliance to maintain sensory organization function in edentulous patients. Dynamic equilibrium function did not change after inducing periodontal pain by separating elastics.