Estimation of the Temporomandibular Joint Position ∗

Abstract. In dentistry there is a problem of measuring temporomandibular joint head (condyle) trajectory relative to the skull. In this paper we propose a noninvasive photogrammetric method for this measurement. A camera is aimed at two known targets, the first is attached to the upper teeth (that is on the skull), the second is mounted on the lower teeth (on the jawbone). The relative position of the targets is estimated by a camera autocalibration procedure using known points on the targets. The position and trajectory of the condyle, which is not directly measured, is calculated from the sequence of images.