A dental impressiontray assembly includes an upper trayand a lower tray operable with theupper tray, and the lower trayin-cludes a first piece configured tomeasure jaw relations of a patient'smouth and a pair of second piecesde-tachably attachable to the first piece.The first piece of the lower tray is in-sertedinto the patient's mouth inde-pendentlyof the pair of second piecesof the lower tray to measure the jawrelations and to obtain a bite registra-tion.After the first piece is connectedto the pair of second pieces, the as-semblyallows a final gum impressionof the patient's lower gum to beob-tained.
