An impression device of the type used in simultaneous recording of the upper and lower jaw positions relative to each other. Also disclosed are methods of manufacturing of types of individual appliance for patients using the impression device. The impression device comprises a tray capable of accepting impression material for use in recording an occlusion between an upper and lower jaw, whereby, when inserted in a subject's mouth. A locator is adapted to displace relative to the upper and lower jaws thereby obtaining a measurement of misalignment of the upper jaw with respect to the lower jaw.
