![]() On the other hand, E4D dentist does not require powder in most cases and iTero, PlanScan, Trios and Zfx Intrascan do not require the application of reflective agent. CEREC AC Bluecam, Fastscan and Lava COS always require powder. The powder is used to enhance scanner's recognition rate and shorten scan time by reducing reflection on the tooth surface with various materials. The depth of field depends on these scanning technologies and has an influence on the learning curve of the device. Also, active triangulation is applied for CEREC AC Bluecam, Fastscan and Lava COS while confocal microscopic technology is adopted in iTero, Trios and Zfx Intrascan. ![]() For instance, E4D is operated by optical coherence tomography. Due to its nature that the scanner itself has to move in the narrow oral cavity as compared with the desktop scanner, there are various scanning technologies. Of the IOS distributed currently in use, CEREC AC Bluecam, E4D dentist and iTero (first generation) adopted the former method while the latter is adopted by E4D NEVO, Fastscan, Lava COS, Trios and Zfx Intrascan. and Schaefer et al., 2 3 IOS can be classified into the still image acquisition and video acquisition methods according to the image recombination.
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