Method and system for managing multiple impressions of a patient's jaw for an orthodontic treatment is provided. The method includes scanning at least a first impression and a second impression of same jaw for the orthodontic treatment； determining if the first jaw impression and the second jaw impression have distortion in different areas； selecting the first jaw impression or the second jaw impression as a base impression； and replacing a distorted tooth data from the base impression with data for the same tooth from a non-base impression. The method also includes scanning at least a first jaw impression for the orthodontic treatment； scanning a bite impression for the orthodontic treatment； matching the scanned first jaw impression with the scanned bite impression； comparing bite information with a tooth occlusal surface； and determining if reconstruction is to be performed on the tooth occlusal surface.
