间接法数字化印模及3D数据偏差对比实验研究

针对口腔数字化诊疗中的牙植入体逆向建模过程利用光栅3维扫描的曲面拟合误差影响建模精度，传统漏洞修补重构的点云数据拼合失真等问题；通过对间接牙模型进行逆向建模及拼接误差对比实验，找出数字化印模重构特征曲面与有效降噪的曲面重构平顺性弥补方法；得出了优化的实验流程，通过3D数据对比验证不同扫描方式优劣的3D分析结果，研究结果表明改进的实验对比方法有效找出了间接数字化印模的3DP植入体在临床应用中存在误差的原因，并验证了提高3维扫描精度的有效方法，降低了逆向建模中点云数据漏洞修补畸变率. 

Experimental Comparison of Indirect Digital Impression and 3D Data Deviation

In the process of dental implant reverse modeling in digital dental diagnosis and treatment, the surface fitting error of three-dimensional raster scanning was used to influence modeling accuracy, and the point cloud data of traditional hole repair and reconstruction was distorted. Through the reverse modeling of indirect dental model and the comparison experiment of splicing error, a method to make up for the smoothness of digital impression reconstruction characteristic surface and effective noise reduction surface reconstruction was obtained, the optimized experimental process was obtained, and the 3D analysis results of different scanning methods were verified by 3D data comparison. The research results show that the improved experimental comparison method effectively finds out the causes of errors in clinical application of 3DP implants with indirect digital impression, and verifies the method for effectively improving 3D scanning accuracy, reducing the distortion rate of point cloud data vulnerability repair in reverse modeling.