![]() Many dentists are reluctant to become involved with newer technologies in impression making because they either mistakenly believe that the elastomeric technique and materials have been around since time immemorial and are immutable, or that 3D digital scanners are too new a technology that is not yet “ready for prime time.” In fact, elastomeric impression materials, with their many inherent problems, 2,3 have only been in use in dentistry for 72 years.ģD digital dental impression scanning systems actually were introduced to the profession in the mid-1980s and have advanced to the degree that, at a meeting of the New England Academy of Cosmetic Dentistry held in Boston in October 2007, master dental technician Lee Culp predicted that most dentists would be using digital scanners for impression making “within 5 years.” 1 The first elastomeric material specifically produced for the purpose of dental impression-making was Impregum™, a polyether material introduced by ESPE, GmbH in 1965. The widely used techniques currently employed for obtaining elastomeric impressions and for creating gypsum models from those impressions have only been in use since 1937, when Sears introduced agar as an impression material for crown preparations. The acquisition of an accurate negative copy of a prepared tooth or teeth and of the adjacent and opposing teeth and the establishment of a correct interocclusal relationship, as well as the conversion of this information into precise replicas of the dentition on which indirect restorations can be made, are the ultimate goals of the impression process in restorative dentistry. A Paradigm Shift in the Concept for Making Dental Impressions Several of the leading 3D dental digital scanning systems are presented and discussed in this article. The use of these products presents a paradigm shift in the way dental impressions are made. ![]() These systems are capable of capturing three-dimensional (3D) virtual images of tooth preparations from which restorations may be directly fabricated (CAD/CAM systems) or can be used to create accurate master models for the restorations in a dental laboratory (dedicated impression scanning systems). Aaronson, DMD Chris Stevens, DDS Bob Cohen, CDTĮver since the introduction of the first digital scanner for making dental impressions in the 1980s, development engineers at a number of companies have enhanced the technologies and created in-office scanners that are increasingly user-friendly and produce precisely fitting dental restorations. 3D Digital Scanners: A High-Tech Approach to More Accurate Dental Impressions Nathan S.
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