分段取模计算机配准组合获取完整牙列模型的方法建立

Establishing a method for composing sectional models into a complete dental cast by computer registration

目的 :通过口内分段取模再由计算机完成配准组合,建立一种获取完整牙列模型的新方法 ,初步验证其精度,评价其可行性。方法:对10个完整石膏牙列模型按照临床操作要求进行分段取模,对分段模型进行三维扫描,基于逆向工程软件建模技术,在计算机软件中将分段模型配准组合,获得完整牙列,并与原完整模型进行三维比较。采用SPSS 21.0软件包对数据进行统计学分析,验证其精度。结果 :建立了分段取模再由计算机配准组合获取完整牙列模型的方法,通过比较组合模型与原模型的牙列面形态特征,得到最小观测误差为(0.046±0.055)mm,最大观测误差为(0.032±0.115)mm,3种建模方法间无显著差异(P>0.05)。结论:计算机配准组合分段牙列模型可获得准确的、满足临床应用的完整牙列模型,本方法有望解决开口受限患者采集完整牙列模型中存在的问题。

PURPOSE： The goal of this study was to get some sections of a dental cast in the mouth and combine them through computer to get the whole image of the dental cast, then test the accuracy and feasibility of the new method.METHODS： The bite tray impressions of the sections of 10 dental casts were obtained and the impressions were scanned by computer. All the digital image data from three-dimensional optical scanning of a dental cast were combined to get the whole image of the dental cast. The image was used to compare with the dental cast to determine the accuracy. The data were analyzed using SPSS 21.0 software package. RESULTS： The new method to get the whole image of the dental cast by combining the 3D-scanned digital image data through computer was successfully established. By comparing the combined model with initial model, the smallest error observed was（0.046 ±0.055） mm and the biggest error observed was（0.032±0.115） mm. No significant difference between 3 methods was observed（P〈0.05）. CONCLUSIONS： The accuracy of dental cast can be obtained by combination of the images of sections of the dental cast through computer. This method can solve the problem in patients who have restriction of mouth opening and difficulty to get the whole dental cast.