However, other studies into the scanning of impression materials report different and even contradictory results. affirm that scannable impressions made from vinyl siloxanether can be digitalised with greater overall accuracy than those made from conventional elastomer materials. One study demonstrates that scans of implant impressions are more accurate than those taken of stone models made from pick-up or conventional impressions. The elimination of stone models permitted by the use of scannable impression materials could prove especially advantageous with prosthetic implants, since analogue impression abutments can move as a result of expansion in the stone, leading to complications with the prostheses. Though materials of this kind are not yet widely utilised, many dentists and lab technicians coul d benefit from their use and even improve the accuracy of their digital impressions in certain clinical cases. In this context, the use of impression materials made scannable by specific industrial processes may maintain the benefits of conventional materials while simultaneously avoiding the need to produce stone models, a process that can easily introduce errors, leading to longer times and increased costs for the dental lab. It is nevertheless undeniable that digital workflows offer many advantages in time and quality for the dental laboratory. Learning to use the technologies and instruments involved requires a significant effort, especially for older dentists. The digitalisation of dental practice and laboratory procedures is still very costly and has a relatively steep learning curve. Nevertheless, in certain clinical cases, such as those involving completely or partly edentulous patients, and complete arch rehabilitations on natural teeth or implants, conventional impression materials still provide more reliable results. they do not require physical storage space.they eliminate the risk of cross-infection between dental practice and dental laboratory.they allow models to be evaluated immediately in positive form. ![]() they do not require the casting of stone models. ![]() ĭigital impressions offer well-known advantages and also avoid many of the limitations intrinsic to analogue workflows : Dentists are making an increasing use of intraoral scanners, which produce STL files and generate three-dimensional (3D) images of scanned objects, to obtain digital impressions of dental arches. ![]() Over the last decade, the spread of Computer Aided Design and Computer Aided Manufacturing (CAD/CAM) has led to the development of digital technologies and new workflows in the field of dentistry.
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