DEVELOPMENT OF THREE DIMENSIONAL SOFTTISSUE ANALYSIS SOFTWARE FOR ORTI-IOGNATHIC SURGERY

通过正颌外科手术，在不拍摄X线片的情况下，对颌骨运动后面部形态变化的基础研究进行了研究。在制作三维分析软件之前，我们观察了配备定头器的非接触式三维光学扫描系统(SURFLACER VMH-300F)的可靠性和稳定性。利用该系统和逆向工程软件Imageware9，对10名日本成年人的面部形态进行了测量和分析。矫正位置的操作可将误差减小到0.63 mm±0.15 mm。使用定头器可以进行高精度的测量，而不需要矫正位置，但是，通过矫正可以进一步提高精度。测量基准点的平均误差为2.68±0.89 mm，偏视区基准点具有较高的重复性，口角和下颌角基准点的重复性较低。以头臼为中心旋转而形成的头部缺口的位置。根据正颌手术后面部软组织的变化，判断面部形态的测量误差较小，是临床上有用的面部软组织分析系统。本研究提出如下建议：制作软件分析软件，需要新的摇号耳机自动调整头位方法模块。

We were researched the basic study which were facial form change following the jaw movement by orthognathic surgery without taking a X-ray photograph. Before making three dimensional analysis software, we observed the reliability and stability of non-contacting 3D-optic scanning system(SURFLACER VMH-300F) which equipped cephalostats. We measured and analyzed the facial configurations of 10 adult Japanese by 5 times per one subject with using this system and reverse engineering software (Imageware9).The results were as follows.1. Operation of rectifying a position was able to be reduced the error to 0.63mm±0.15mm.2. Measurement with high precision was able to be performed by using cephalostats, without rectifying a position However, it was possible to have raised the accuracy more by rectifying.3. About the measurement datum point, the mean error was 2.68±0.89mm, the datum point of the metopic area had high reproducibility, and the datum point of angle of mouth and angle of mandible had low reproducibility.4. The position of head gapped by rotation centering on the earlod of cephalostats. It has been judged that there were few measurement errors of a face form, and they were useful system at clinical application for analysis of facial softtissue by the changes after orthognathic surgery. This study suggested us following, we making the softtisue analysis software, it is need the new module of automatic adjusting head positioning method with lotating earlod.