一种适用于口腔三维建模的层析测量法的可靠性研究

目的　应用改进的层析测量法进行无牙颌的三维建模,并对其建模精度进行分析研究。方法　采用改进 的层析测量系统对无牙颌模型逐层切削,进行数据运算,重建无牙颌数字模型。用该方法对10个立方体模型分别 重建数字模型,测量建模前后各条边长的数据,对测量结果进行统计分析。结果　对无牙颌模型逐层切削后获得 完整无牙颌数字模型;10个立方体建模前后的总体误差间无显著性差异(P>0·05);在水平方向建模前后的测量数 据间无显著性差异(P>0·05);在高度方向建模前后的测量数据间存在显著性差异(P<0·01),建模后的小于建模 前(0·09±0·08)mm。结论　改进的层析测量法能够适用于口腔高精度的三维建模。

Reliability of an Improved Measurement System Used in Three-dimensional Reconstruction of Stomatognathic System by Cutting and Scanning Layer-by-layer

OBJECTIVE: To reconstruct 3D shape of edentulous jaw by using improved measurement system and to analyze the precision of this method. METHODS: Standard edentulous jaw models were measured with a improved measurement system by cutting and scanning layer-by-layer, and the 3D shape of the models was reconstructed by image processing with specialty software. Ten cubic plaster modes were reconstructed by the same way, data of every border before and after reconstruction were measured and analyzed. RESULTS: Data of edentulous jaw models were obtained. The errors in ten cubic before and after reconstruction were not significantly different (P > 0.05), data measured in horizontal plane were not significantly different (P > 0.05), and data measured in altitude direction were significantly different (P < 0.01), data measured after reconstruction were less than before, the error was (0.09 +/- 0.08) mm. CONCLUSION: The improved cutting and scanning measurement system can be fit for the 3D reconstruction of stomatognathic system with high precision.