The studies indicated variable outcome of the different IOS systems. However, for whole arch scanning, the IOS is susceptible for more deviation. In comparison to conventional impressions, the IOS systems can be reliably used for diagnostic purposes and short-span scanning. The following systems were included in the review: Cerec Bluecam, Cerec Omnicam, Cadent iTero, Lava C.O.S, Lava True Definition, TRIOS, TRIOS Color, E4D, Planscan, MHT, Carestream 3500 and Zfx IntraScan. After applying the inclusion criteria, 32 studies were suitable for the analysis. A total of 2305 studies were initially obtained. The literature search was completed to retrieve all the studies that investigated the IOS accuracy when used to scan teeth. This systematic review aimed to evaluate the accuracy of the available IOS systems for dental impression, and identify the influencing factors on accuracy. Digital impressions by intraoral scanning (IOS) have become an increasingly popular alternative to conventional impressions.
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