The use of traditional finite element method (FEM) in occlusal stress analysis is limited due to the complexity of musculature simulation. The present purpose was to develop a displacement boundary condition (DBC)-FEM, which evaded the muscle factor, to predict the dynamic occlusal stress. The geometry of the DBC-FEM was developed based on the scanned plastic casts obtained from a volunteer. The electrognathographic and video recorded jaw positional messages were adopted to analyze the dynamic occlusal stress. The volunteer exhibited asymmetrical lateral movements, so that the occlusal stress was further analyzed by using the parameters obtained from the right-side eccentric movement, which was 6.9 mm long, in the stress task of the left-side eccentric movement, which was 4.1 mm long. Further, virtual occlusion modification was performed by using the carving tool software aiming to improve the occlusal morphology at the loading sites. T-Scan Occlusal System was used as a control of the in vivo detection for the location and strength of the occlusal contacts. Data obtained from the calculation using the present developed DBC-FEM indicated that the stress distribution on the dental surface changed dynamically with the occlusal contacts. Consistent with the T-Scan recordings, the right-side molars always showed contacts and higher levels of stress. Replacing the left-side eccentric movement trace by the right-side one enhanced the simulated stress on the right-side molars while modification of the right-side molars reduced the simulated stress. The present DBC-FEM offers a creative approach for pragmatic occlusion stress prediction.

由于肌肉组织模拟的复杂性，传统有限元法 (FEM) 在咬合应力分析中的使用受到限制。目前的目的是开发一个位移边界条件 (DBC)-FEM，它避开了肌肉因素，以预测动态咬合应力。DBC-FEM 的几何形状是根据从志愿者那里获得的扫描塑料模型开发的。采用颌骨电图和视频记录下颌位置信息来分析动态咬合应力。志愿者表现出不对称的横向运动，因此通过使用从长 6.9 毫米的右侧偏心运动获得的参数，在左侧偏心运动的压力任务（长 4.1 毫米）中进一步分析咬合应力长的。更远，通过使用雕刻工具软件进行虚拟咬合修改，旨在改善加载部位的咬合形态。T-Scan 咬合系统用作咬合接触位置和强度的体内检测的对照。使用目前开发的 DBC-FEM 从计算中获得的数据表明，牙齿表面的应力分布随着咬合接触而动态变化。与 T-Scan 记录一致，右侧臼齿始终显示出接触和更高水平的压力。用右侧偏心运动轨迹代替左侧偏心运动轨迹增强了右侧磨牙的模拟应力，而右侧磨牙的修改降低了模拟应力。目前的 DBC-FEM 为实用的咬合应力预测提供了一种创造性的方法。