1. A method for managing multiple impressions of a patient's jaw for an orthodontic treatment, comprising: scanning a first impression and a second impression of the patient's jaw to create a first digital image of the first impression and a second digital image of the second impression; digitally processing the first digital image into a first plurality of digital objects, each representing a single tooth in the jaw, and digitally processing the second digital image into a second plurality of digital objects, each of the second plurality of digital objects corresponding to one of the first plurality of digital objects; storing each of the first and second pluralities of digital objects obtained by digitally processing the first and second digital images; determining if the first jaw impression and the second jaw impression have distortion in non-corresponding ones of the first and second pluralities of digital objects; if the first and second jaw impressions have distortion in non-corresponding ones of the first and second pluralities of digital objects, selecting a base impression and a non-base impression from the first jaw impression and the second jaw impression; and correcting a distorted digital object from the base impression using a corresponding digital object from the non-base impression.