Intraoral scanners are extremely expensive, not only at the time of purchase, but also afterwards, as they often entail annual costs for upgrades and assistance. The reasons for this lie, first and foremost, in the fact that the cost of analogical impressions is far lower than the cost of digital impressions (regardless of whether the impression is taken using materials like alginate or whether elastomers are used). On a technical level, digital impressions are taken more quickly by dentists, especially when compared with impressions taken using manually-mixed materials, although the result is very operator-dependent.ĭigital impression compared to a scanned gypsum model obtained using an analogical impression The advantages of analogical impressionsĪnalogical impressions are still the impression type most commonly used in the majority of dental practices 5. It also affords extremely direct access to the digital work-flow, and to CAD/CAM systems with subtractive and additive technologies, which are now always used by dental technicians to materially produce prostheses and mesostructures.ĭigital impressions also avoid the discomfort that impression materials can cause patients, such as bouts of vomiting and the unpleasant taste, simultaneously also eliminating the risk of presenting allergies to the impression material 3,4. As a matter of fact, digital impressions allow, for example, faster and, in some cases, better communication with dental technicians and patients 2.ĭigital impressions do away with the gypsum model-making step, which involves possible errors in analogical impression casting and the impression can be kept as an STL file for an unlimited period of time. Optical impression-taking using an intraoral scanner (IOS) presents a series of advantages and resolves certain issues that characterise conventional impression-taking 1. The digital impression systems now used in daily clinical practice afford higher performance in terms of accuracy and precision, although in some cases analogical impressions remain irreplaceable and decisive for giving the technician the correct clinical information. This process involves the use of a scanner that acts as a tool for acquiring data in order to produce three-dimensional (3D) images of the structures (teeth, dental arches and tissues) scanned, in the same way as with an analogical impression. More specifically, the advent of CAD-CAM (computer-aided design/computer-assisted manufacturing) systems has led to the development of digital technologies for intraoral impression-taking. In recent years there has been an increase in the interest in digital technologies that has impacted various sectors worldwide, from defence to engineering, and even the health sector, including dentistry.
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