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Types of Digital Impression Technology. There are two types of digital impression technology currently available for dentists to use. One type captures the images as digital photographs, providing dentists and dental laboratories with a series of images; the other type captures images as digital video. The images can be captured using lasers or digital scanning.
An alginate impression is used in dentistry to make an exact replica of the patientâs teeth, gingiva, and surrounding tissues in the mouth. The alginate dental impression forms an imprint (i.e. a ânegativeâ mould) of those teeth and gums, which can then be used to make a cast or âpositiveâ model of the patientâs dentition. Alginate impression material begins as a powder. When mixed with water, a thick pasty material, similar to cake frosting, appears.