Gurdsapsri W, Ai M, Baba K, Fueki K
The First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
J Oral Rehabil. 2000 Mar;27(3):239-44. doi: 10.1046/j.1365-2842.2000.00527.x.
The purpose of this study was to evaluate the relationship between the clenching level and the intercuspal contact area in different regions of the dental arch. Twenty-five healthy subjects with natural normal dentitions and good occlusal support performed clenching tasks in the intercuspal position at four different levels (10, 30, 70 and 100% levels of maximum voluntary contraction) through EMG visual feedback from bilateral masseter and anterior temporal muscles. Simultaneously, the occlusal contacts were recorded with a silicone occlusal contact checking material (Black Silicone, GC Dental Industrial Corp., Tokyo, Japan). The occlusal records were analysed by an image analyser. Every area of the thickness less than 50 microm was determined to be an occlusal contact area. The occlusal contact areas on the anterior teeth (incisors and canines), the premolars (first and second premolars) and the molars (first and second molars) were calculated separately. The posterior occlusal contact area increased with an increase in the clenching levels but that of the anterior did not. The results of this study indicate that the increase in clenching forces affects the anterior and posterior occlusal contact areas differently.
本研究的目的是评估牙弓不同区域的紧咬程度与牙尖交错接触面积之间的关系。25名拥有天然正常牙列且咬合支持良好的健康受试者，通过双侧咬肌和颞前肌的肌电图视觉反馈，在牙尖交错位以四个不同水平（最大自主收缩的10%、30%、70%和100%水平）进行紧咬任务。同时，使用硅橡胶咬合接触检查材料（黑色硅橡胶，日本东京GC牙科工业公司）记录咬合接触情况。通过图像分析仪对咬合记录进行分析。厚度小于50微米的每个区域被确定为咬合接触面积。分别计算前牙（切牙和尖牙）、前磨牙（第一和第二前磨牙）和磨牙（第一和第二磨牙）的咬合接触面积。后牙咬合接触面积随紧咬程度的增加而增加，但前牙的咬合接触面积则不然。本研究结果表明，紧咬力的增加对前牙和后牙咬合接触面积的影响不同。
