Institute of Applied Mechanics (CE), Universität Stuttgart, Stuttgart, Germany.
J Prosthodont. 2009 Dec;18(8):703-10. doi: 10.1111/j.1532-849X.2009.00510.x. Epub 2009 Sep 14.
One of the current limitations of computer software programs for the virtual articulation of the opposing teeth is the static nature of the intercuspal position. Currently, software programs cannot identify eccentric occlusal contacts during masticatory cyclic movements of the mandible.
Chewing trajectories with six degrees of freedom (DOF) were recorded and imposed on a computer model of one subject's maxillary and mandibular teeth. The computer model was generated from a set of high-resolution micro-CT images. To obtain natural chewing trajectories with six DOF, an optoelectronic motion-capturing system (VICON MX) was used. For this purpose, a special mandibular motion-tracking appliance was developed for this subject.
Mandibular movements while chewing elastic and plastic food samples were recorded and reproduced with the computer model. Examples of mandibular movements at intraoral points are presented for elastic and plastic food samples. The potential of such a kinematic computer model to analyze the dynamic nature of an occlusion was demonstrated by investigating the interaction of the second molars and the direction of the biting force during a chewing cycle.
The article described a methodology that measured mandibular movements during mastication for one subject. This produced kinematic input to 3D computer modeling for the production of a virtual dynamic articulation that is suitable for incorporation into dental CAD/CAM software.
目前用于虚拟对颌牙齿的计算机软件程序的一个局限性在于正中牙合位的静态性质。目前，软件程序无法在咀嚼下颌的循环运动期间识别非正中牙合接触。
记录了具有六个自由度 (DOF) 的咀嚼轨迹，并将其施加到一个受试者上颌和下颌牙齿的计算机模型上。该计算机模型是由一组高分辨率微 CT 图像生成的。为了获得具有六个自由度的自然咀嚼轨迹，使用了光电运动捕捉系统 (VICON MX)。为此，为该受试者开发了一种特殊的下颌运动跟踪器具。
记录并通过计算机模型再现了咀嚼弹性和塑性食物样本时的下颌运动。呈现了弹性和塑性食物样本在口内点的下颌运动示例。通过研究咀嚼周期中第二磨牙的相互作用和咬合力的方向，展示了这种运动学计算机模型分析咬合动态性质的潜力。
本文描述了一种针对一个受试者测量咀嚼时下颌运动的方法。这为 3D 计算机建模提供了运动学输入，以生成适合纳入牙科 CAD/CAM 软件的虚拟动态咬合。
