Abstract: 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.