Abstract: Dental impression trays for obtaining an impression of an arch by using the impression material according to this invention are characterized by comprising: a maxillary tray (10), which is adjustable according to the arch size by forming a U-shaped stray curved in the arch form for receving the impression material with resprectively extended hinge plates (12) being fixed to its center where the tray is divided into two and with fastening pants being engaged with said hinge plates (12), and a mandibular tray (20), which is adjustable according to the arch size by forming a U-shaped tray curved in teh arch form for receiving the impression material with respectively extended hinge plates (12) being fixed to its center where the tray is divided into two and with fastening parts being engaged with said hinge plates (12).