新型层析反求测量系统牙颌建模的应用研究

目的对新型层析反求测量系统的断层图像获取及定位精度等进行评估,并进行上下牙颌的建模应用。方法使用新型层析反求测量系统获取同心圆测量标定板图像,通过5次模拟层析及图像获取过程,测量圆心及四个不同方向的圆形半径变化,分析图像变形率,评估图像重复定位精度。并应用该系统对具有咬合关系的上下颌牙列模型进行逐层切削,数据运算,重建牙颌数字模型。结果新型层析测量系统各个方向上5次测量结果间无统计学差异P>0.05,在距离上测量结果存在显著性差异P<0.05,Student-Newman-Keuls两两对比统计发现,5mm到25mm距离变形差异不显著P>0.05,25mm和30mm时距离变形有统计学差异。重复定位测量表明,最大误差小于0.026mm。通过层析测量数据,可以建立具有咬合关系的牙颌数字模型。结论新型层析反求测量系统具有较高的图像获取及定位精度,能够适用于口腔牙颌的三维建模。

An application study of dental modeling by a novel reverse engineering system based on layer cutting and scanning

Objective To evaluate accuracy of registration and anamorphose of cross-sectional imaging, and to reconstruct the teeth with occlusion by a novel reverse engineering system based on layer cutting and scanning.Methods The images of cocenric citcle were obtained by the system , the registration and anamorphose of cross-sectional imaging were analyzed by measuring variances of circle center and radius in four different directions. The tooth model with occluding relation was then cutting layer by layer; data were processing and using to reconstruct the digital model.Results The data of different directions were not significantly different (P>0.05) in five measurements, but measurements in different distance were significantly different (P<0.05). Deep study using Student-Newman-Keuls statistics showed that there were no significantly different from 5mm to 25mm (P>0.05), there were significantly different from 25mm to 30mm (P<0.05). Maximum error of center positions in five measurements were lower than 0.026mm.The digital dental model with occlusion was made by this novel system.Conclusion The novel reverse system has the high accuracy of registration and lower anamorphose, and it can be fit for the 3D reconstruction of stomatognathic system with high precision.