Passive fit is a primary factor for long term clinical success and survival of an implant-supported restoration. The precise transfer of three-dimensional intraoral implant relationship to the master cast is a critical step to achieve a passive fit. Advancements of 3D technology and digitalization enabled the development of dental scanners (IOS), which offer the possibility to replace conventional impression methods with optical impressions. Dental scanners are an integral part of CAD/CAM systems and are divided into intraoral scanners, which are used in-office, and laboratory scanners, which are used extra-orally for scanning the impression or master casts. Working principles most commonly used for intraoral scanners are triangulation, active wavefront sampling and parallel confocal laser scanning, and the most important characteristics of dental scanners, for verification of the reproducibility of an impression, are trueness and precision. In implant-prosthodontics, digital impressions are used for therapy planning, computer guided implant surgery, making impressions and presenting 3D location of implants as the first step of digital workflow in restoration making. Being compared with conventional impressions, digital impressions taken by dental scanners show numerous advantages. The time needed for impressions-making is significantly reduced and the number of work phases shortened, which greatly decreases the possibility of errors. Apart from reduced time consumption, digital impressions also provide the possibility of easy archiving, as well as improved communication between the office and the laboratory. Single crowns and smaller prosthetic restorations, made by IOS, achieve better fit and precision than classical impressions, however they are not recommended for scanning of implant-supported restorations with large range and small number of implants. Accuracy of optical impression increases as the number of placed implants increases and the distance between implant decreases. Key