Development of stomatognathic function diagnostic system by using a compact 6 degree of freedom jaw tracking device

本项目的目的是开发一种新型的紧凑型6自由度磁相空间控制的颌骨跟踪装置。在新设备之前，没有使用面部弓的颌骨跟踪设备已经被制造成该项目的开发模型。此外，还对颌骨功能进行了分析，以开发高可靠性的口腔颌面功能诊断系统。主要研究结果如下：1.通过改变线圈和线圈驱动方式，改善了宽磁相空间内的低信噪比。在模拟电路中安装了低应变振荡器和低噪声放大器，以实现精确的颌骨运动记录。根据开发模型的标定，尝试了一种在磁相空间中校正数据的方法。然而，由于几个非线性因素的存在，需要更精确的数据校正。利用6自由度数字颌面跟踪器，分析咬合时头部与上下牙弓之间的关系。研究了咬合过程中口腔颌面系统的变形情况及其对颌骨运动分析的影响。将高分辨率6自由度颌骨运动数据与颞下颌关节三维重建图像、上下颌牙弓数字图像相连接。所得到的空间耦合的图形图像可以在PS 390图形终端上可视化。对功能性下颌运动中的咬合牙合接触和关节间隙进行评估。由6自由度数字颌面跟踪器、多通道肌电记录装置和颞颌关节录音装置组成的口腔颌面功能诊断系统正在研制中。

The aim of this project was to develop a new compact 6 degree of jaw tracking device which is controlled in the magnetic phase space. Prior to the new device, the Jaw tracking device without the use of face bow has been fabricated as a developmental model of this project. Moreover, the analysis of Jaw function has been advanced in order to develop a highly reliable stomatognathic function diagnostic system. The results were as follows :1. Low signal-to-noise ratio in the wide magnetic phase space was improved by changing the coil and coil driving method.2. Low strained oscillator and low noise amplifier was installed in the analogue circuit for precise jaw movement recording.3. According to the calibration of developmental model, a method of correcting data in the magnetic phase space was attempted. However, there is a need for more precise data correction due to the presence of several nonlinear factors.4. The relationships among head, upper and lower dental arches in clenching were analyzed by using the 6 degree of freedom digital jaw tracking device. As a result, the distortion of stomatognathic system in tooth clenching was detected as well as its influences to the analysis of jaw movement.5. The high resolution 6 degree of freedom jaw movement data were linked to the 3 dimensional reconstructed images of the temporomandibular joint, digital images of maxillary and mandibular arches. The resulting spatially coupled graphic images can be visualized on a PS 390 graphic terminal. The occlusal tooth contacts and the joint space in functional jaw movements were evaluated.6. Stomatognathic function diagnostic system, which consists of a 6 degree of freedom digital jaw tracking device, multichannel EMG recording device and temporomandibular joint sound recording unit is in the process of development.