Dental face bow and hinge axis locator

967,117. Dentistry. MEDICAL ELECTRONICS & RESEARCH CORPORATION. Sept.27, 1962, No. 36696/62. Heading A5R. A device for locating the cardylar axis of the natural jaw comprises a mouthpiece 14 carrying a cross-bar 10 for extending horizontally in front of the patient's face, a rearwardly extending cardyle locating arm 62, means for connecting the arm to the cross-bar comprising a first part 84 fixed to the crossbar, a second part 100 movable about an axis 98 parallel to the cross-bar and in which the cardyle arm is slidable and means 110 for selectively varying the angular distance between the first and second parts. Cardyle locating pins 74 are adjustably carried at the free ends of two cardyle locating arms. The first connecting part 84 is releasably clamped around the cross-bar 10 and pivotally mounts the movable part 100 in which the cardyle locating arm is axially adjustable on rotating a nut 78. The angular distance between the parts is adjustable against a leaf spring 102 by turning a nut 110, which abuts the first connecting part, on a threaded pin 109, which is pivotal on the movable part. A post 34 is adjustably clamped on the cross-bar. In use the mouthpiece is connected to the mandibular teeth and the length and inclination of the cardyle locating arms and the position of the cardyle pins are adjusted until movement of the pins as the patient chews is imperceptible. The points of the pins then indicate the desired candylar axis.