Development of occulusel treatment supporting system in patients with temporomandibular disorders

颞下颌关节紊乱病（TemporomandibularDisorders，TMD）患者的治疗效果如何，颞下颌关节X线片上髁突位置的评估是重要因素之一。因此，本研究的目的是发展一种方法来量化髁突的位置变化的侧TMJ断层图像，使用数字减影。该方法允许髁突参考点的旋转和平移变化，以便于测量。准确性进行了评价，在体外使用两个TMJ的两个干燥的人类头骨和在体内与7名志愿者。体外旋转角度的平均绝对误差为0.67 °。前后平移元件的平均绝对误差为0.07 mm，上下平移元件的平均绝对误差为0.06 mm。根据这些结果，我们可以得出结论，该方法提供了临床可接受的测量准确度。为了验证该方法的有效性，使用了一个临床病例和16名志愿者的实验咬合条件。并研制了一套简便、准确的咬合位置记录系统。

To achieve good occlusal treatment results in patients with temporomandibular disorders (TMD), evaluation of the condyle position on the radiographs of temporomandibular joint (TMJ) is one of the important factor. Therefore, purpose of this study is to develop a method for quantifying positional change of the condyle on lateral TMJ tomograms by use of digital subtraction. This method permits rotational and translational changes of condylar reference points for easy measurement. Accuracy was evaluated in vitro using the two TMJs of two dry human skulls and in vivo with seven volunteers. The average absolute error of the angle of rotation in vitro was 0.67 degrees. For the anterior-posterior element of translation the average absolute error was 0.07mm, and for the superior-inferior element of translation it was 0.06mm. From these results, we could conclude that this method provides clinically acceptable measurement accuracy. To verify the usefulness of the method, one clinical case and l6 volunteers with were experimental bite conditions used. An easy and accurate recording system of occlusal position were also developed.