Abstract
The dimensional changes of the materials used for bite registrations are critical for the accuracy of the records meant for programming the dental articulators. The purpose of this study was to determine the long-term dimensional changes of three bite registration materials. We selected two polyvinyl siloxanes and a bis acrylate-based material. The study was carried out in a semi-adjustable articulator. The data were collected by a photo camera in standardized conditions and then analyzed using an appropriate program and statistical analysis. We did not find significant long-term dimensional changes of the used materials. In the limits of this study we concluded that the polyvinyl siloxane, as well as the bis acrylate based bite registration materials are accurate enough to provide reliable records to program the semi-adjustable articulators. Keywords: polyvinyl siloxane, bis acrylate, bite registration, dimensional changes