Abstract
The accuracy of obtaining negatives of preparation region directly affects the success of the restoration in fixed prosthetic tooth treatment. Therefore, impression materails and techniques should be taken into consideration as much as sensibility of preparation. Over the years, impressions materials have undergone change in order to provide most accurate and precise detail. Physical and chemical properties like dimensional stability, tear strength and biocompatibility have been tried to increase by conducting new studies. However, presence of numerous external factors such as ability of the clinician, environmental conditions, storage conditions of impression metarials should not be forgetten while taking an impression. The use of Computer Aided Manufacturer And Design (CAD/CAM) technologies in dentistry are increased by the development of this systems. Digital scanner is one of the reforms of CAD/CAM systems. Digital scanner which extinguish unwanted properties of conventional impression tecniques provides possibility of taking easy impression for dentist and patients. In dental market multiple companies aim to minimalize the problem that might happen in clinic or laboratory by adding intraoral or extraoral digital scanner to CAD/CAM systems. The aim of this rewiev is to evaluate the populer impression tecniques, to compare them with old techniques and examine the novelty of impression in wide aspects
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