Effects of Changes in Oro-facial Structures and Occlusal Contacts upon Temporomandibular Joint Loading During Dynamic Occlusion : Comparison of Jaw Biomechanics between Pre- and Post Surgical-Orthodontic Treatment by Dynamic Modeling

（1）建立了能够预测颞下颌关节（TMJ）载荷动态变化的多牙接触模拟人颌骨动态模型。（2）建立的模型模拟了前牙开、安氏Ⅱ类磨牙和下颌磨牙缺失时颞下颌关节载荷的差异。最大的颞下颌关节负荷预测模型与损失的下磨牙。（3）咬合力、关节力和肌力之间存在复杂的关系。动态关系依赖于牙周膜TMJ盘的粘弹性特性。（4）单侧种植体的粘弹性模型预测种植体对侧TMJ的载荷更大。（5）咬合过程中，上下第一前磨牙缺失的模型比第一前磨牙全部缺失的模型预测的颞下颌关节负荷高8.5%，提示颞肌主动收缩30%可使颞下颌关节负荷降低8.5%。（6）利用逆运动学建模的方法，对牙周膜的初始响应进行解析描述。结果表明，逆运动学模型是能够分析文件的牙齿位移是独立的力的大小。

(1)Dynamic human jaw model with analogues for multiple tooth contact that can predict dynamic changes in temporomandibular joint(TMJ) loading has been developed.(2)The newly developed model simulated difference between the TMJ loadings when biting with anterior open bite, Angle Class II molar occlusion and loss of lower molars. The greatest TMJ loading were predicted in the models with loss of the lower molars.(3)Complex relationships were predicted between occlusal, articular and muscle forces. The dynamic relationships depended on visco-elastic properties in periodontium TMJ discs.(4)The model with analogues for visco-elasticity of dental implant at the unilateral side of the mandible predicted greater TMJ loading at the contra-lateral side of the implant.(5)The model with loss of upper/lower first premolars predicted 8.5% greater TMJ loading during biting as compared to those by the model for the occlusion with all the first premolars, suggesting that 30% voluntary reduction of the anterior tempolaris muscle enables the 8.5% reduction of the TMJ loading.(6)The initial response of periodontal ligament was to analytically describe by means of inverse kinematic modeling. The results demonstrate that the inverse kinematic model is capable of analytical documentation of tooth displacement that is independent of the force magnitude.