Influence of alteration of occlusal relationship on activity of jaw closing muscles and mandibular movement during submaximal clenching.
Influence of alteration of occlusal relationship on activity of jaw closing muscles and mandibular movement during submaximal clenching.
复制标题
咬合关系改变对下颌闭合肌活动和次最大咬紧过程中下颌运动的影响。
DOI：
10.1046/j.1365-2842.2000.00587.x
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发表时间：
2000
影响因子：
2.9
通讯作者：
Minoru Ai
中科院分区：
文献类型：
--
作者：
Kazuyoshi Baba;S. Akishige;T. Yaka;Minoru Ai
这项研究的目的是调查在模拟咬合过程中，咬合接触、肌肉反应和下颌运动之间的关系。7名健康男性，拥有完整的天然牙弓，咬合正常，年龄从24岁到29岁，自愿参加这项研究。为了模拟不同的咬合条件，制作了亚克力咬合止血器。用四套线性可变差动变压器测量下颌骨的垂直运动。同时，测量双侧咬肌和前颞肌的肌电活动。在实验改变的咬合条件下，受试者以其最大自愿收缩水平的50%进行咬合任务。对肌电反应的分析表明，咬合支撑一侧往往会引起同侧颞前肌的单侧活动。移动幅度分析显示，实验咬合条件下的移动幅度有显著差异(P<；0.05)。咬合单侧咬合止点引起对侧更大的上移。在没有磨牙支撑的情况下，双侧第一前磨牙咬合导致下颌后移较大，而双侧第二磨牙咬合不会引起明显的上移。
The aim of this study was to investigate the relationships between occlusal contacts, responses of muscles, and jaw movements during simulated clenching. Seven healthy human males who possessed complete natural dental arches with normal occlusion, ranging from 24 to 29 years of age, volunteered for this study. Acrylic occlusal stops were fabricated for the lower jaw to simulate various occlusal conditions. Vertical movements of the lower jaw were measured by four sets of linear variable differential transformers. Simultaneously, electromyographic (EMG) activity from the bilateral masseter and anterior temporal muscles was measured. Under experimentally altered occlusal conditions, the subjects performed clenching tasks at 50% of their maximal voluntary contraction level. Analysis of EMG responses revealed clenching on the unilateral occlusal support tended to cause a unilateral activity of the ipsilateral anterior temporalis. Analysis of the movement amplitude revealed a significant difference between the experimental occlusal conditions (P < 0.05). Clenching on unilateral occlusal stops caused a larger upward movement on the contralateral side. Bilateral first premolar clenching without molar support caused a larger upward movement of the mandible in the posterior region, whereas bilateral second molar clenching did not cause a significant upward movement.