Why is the lab analog for the digital and conventional impression different?

Why is the lab analog for the digital and conventional impression different?

Editor note: Aside from the initial question, on the general subject of digital impressions, we also are interested in comments on your experience vis a vis accuracy. See: Digital Impressions in Implant Dentistry: A Literature Review, The accuracy of digital impressions in implant dentistry depends on several aspects. The depth/angulation of the implant, the experience of the operator, the intra-oral scanner used, and environmental conditions may influence the accuracy of digital impressions in implant dentistry.