Böröcz Z, Dirksen D, Thomas C, Runte C, Bollmann F, von Bally G
Universitätsklinikum Münster, Labor für Biophysik.
Biomed Tech (Berl). 2004 May;49(5):111-6. doi: 10.1515/BMT.2004.023.
In dentistry, mechanical articulators with which mandibular movements can be reproduced in dentals casts play a major role. Commonly used semiadjustable articulators, however, have major limitations: On the one hand, the movement of the mandible is not reproduced exactly, on the other, they do not provide time-related information on jaw movement. Both problems can be solved by replacing the mechanical articulator by a digital simulation ("virtual articulator") based on digitized plaster casts and electronically recorded masticatory movements. We present a system for the 3D measurement of plaster casts in a skull-related, anatomical coordinate system using the fringe projection technique, and electronically recorded condylar movements. Using numerical algorithms, the contacts between upper and low jaw, and the angle of rotation of the temporomandibular joint can be computed for each movement in dynamic occlusion. Taking the data recorded from a patient as an example, the influence of the accuracy of the digitization of plaster casts on the computation of the rotation of the temporomandibular joint is discussed in relation to the anatomy of the masticatory apparatus.
在牙科领域，能够在石膏模型上重现下颌运动的机械咬合架起着重要作用。然而，常用的半可调式咬合架存在重大局限性：一方面，下颌运动无法精确重现；另一方面，它们无法提供与时间相关的下颌运动信息。通过基于数字化石膏模型和电子记录的咀嚼运动，用数字模拟（“虚拟咬合架”）取代机械咬合架，这两个问题都可以得到解决。我们展示了一种系统，该系统使用条纹投影技术，在与颅骨相关的解剖坐标系统中对石膏模型进行三维测量，并记录髁突的电子运动。利用数值算法，可以计算出动态咬合中每次运动时上下颌之间的接触以及颞下颌关节的旋转角度。以从患者记录的数据为例，结合咀嚼器官的解剖结构，讨论了石膏模型数字化精度对颞下颌关节旋转计算的影响。
