Prosthetic restorations are therapeutic agents whose purpose is to establish and maintain proper oral function and aesthetic appearance. Prosthetic restorations must fit perfectly on the prepared teeth. Therefore, the situation in the patient's mouth must be transferred perfectly to the model on which the prosthesis will be made. Impression materials are used for this purpose and today the digital impression technique, i.e. scanning, is being used more and more. First of all, impression materials must be precise, elastic, dimensionally stable, non-toxic, compatible with plaster and they must provide the possibility of disinfection. They are divided into elastic and inelastic, but today only elastic materials, which include synthetic elastomers and hydrocolloids, are used as impression materials. Impression techniques are divided into one-stage and two-stage methods. The first step is to select an adequate stock tray with which the material is introduced into the patient's mouth. If the one-stage impression method is carried out with an individual stock tray, one material is used, and if it is carried out with a metal stock tray, two materials of different consistency are used. Two-stage impression procedures are always performed with two materials of different consistency on two occasions, and they differ in that the first impression in the case of the refill impression method is taken before preparing the teeth, and in the case of the correction impression after preparing. The digital impression method is performed by an intraoral scanner, which converts the data from the patient's mouth into a digital three-dimensional form which is then processed by computer software. The main advantage of this method is the speed of scanning and making a prosthetic restoration, whereas the main disadvantage is the high cost of the equipment.