目的：利用光栅投影技术采集数字化牙颌模型并用逆向工程分析测量模型特征，为建立正常牙列数字化模型数据库奠定基础。方法在计算机控制下将光栅投影在正常牙颌模型上，通过多角度拍摄模型获得三维数据外形轮廓，利用逆向工程重建数字化模型和测量分析牙列形态特征，并与石膏模型测量结果进行对比分析。结果重建的三维数字化模型结构清晰。数字化模型的两次测量结果无统计学差异（P>0.05）；数字化模型与石膏模型的测量指标中，牙冠长度和牙弓宽度均无统计学差异（P>0.05），而牙冠宽度和牙弓长度均有统计学差异（P<0.05）。结论通过光栅投影技术以及逆向工程重建数字化模型，可用于临床、科研中的牙颌模型测量，为建立正常牙颌数字化模型数据库提供科学方法。%Objective This work lays the foundation for establishing a digital model database with normal occlusion. A digital dental cast is acquired through grating projection, and model features are measured through reverse engineering. Methods The grating projection system controlled by a computer was projected onto the surface of a normal dental model. Three-dimensional contour data were obtained through multi-angle shooting. A three-dimensional model was constructed, and the model features were analyzed by using reverse engineering. The digital model was compared with the plaster model to deter-mine the accuracy of the measurement system. Results The structure of three-dimensional reconstruction model was clear. The digital models of two measurements exhibited no significant difference (P>0.05). When digital and plaster models were measured, we found that the crown length and arch width were not statistically different (P>0.05), whereas the difference between the crown width and arch length was statistically significant (P<0.05). Conclusion The reconstruction of a digital model by using the grating projection technique and reverse engineering can be used for dental model measurement in clinic al and scientific research and can provide a scientific method for establishing a digital model database with normal occlusion.
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