14 According to the International Organization for Standardization, digital impression accuracy is defined in terms of trueness and precision. 13 The E3 device (3Shape, Copenhagen, Denmark) is a laboratory scanner used for scanning working casts to design computer-assisted design/manufacturing restorations. 12 Lastly in 2019, the Trios 4 emerged as a tool to identify possible future caries due to its built-in fluorescence technology. 11 In March 2017, a wireless model of Trios 3 was introduced where the scanner is connected to a laptop via Wi-Fi, eliminating the need for cables connecting the computer and scanner.
The USB model allows the dentist to use a laptop. In May 2015, 3 different Trios 3 models were introduced to the dental world: a touch-screen trolley model, a model built in the dental unit, and a USB model. Later in 2013, they developed the Trios Color (Trios 2) with multi-chromatic images. 10 In 2011, the 3Shape company (Copenhagen, Denmark) released the Trios Standard (Trios 1), which has monochromatic images. The most recent Cerec system is the Primescan AC scanner (Dentsply-Sirona, Bensheim, Germany), launched in 2019 using the new Cerec 5 software. Dental Systems GmbH, Bensheim, Germany), 9 followed by the CEREC Bluecam intraoral camera in Cerec 2, while the Cerec Omnicam was an evolution of the CEREC Bluecam with video-photometry technology. 7, 8 In 1987, the first intraoral scanner used by the dental community was Cerec 1 (Sirona. 2, 3, 4, 5, 6 Three types of intraoral scanners are available: mechanical scanners with a touch probe, white-light scanners, and laser scanners. However, digital impressions require an initial investment in intraoral scanners, and they depend on the clinician's skill to ensure a successful scan. 1 The advantages of digital impressions include the absence of a gag reflex in response to the impression materials, controlled impression quality, efficiency in terms of saving money and time, the possibility of sending an impression via the internet to the lab, and utility as a marketing method to attract patients.
Many dentists now use intraoral scanners to capture digital impressions instead of conventional impressions.
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