Abstract
In order to obtain a better understanding of jaw movement and its relationship to other parameters such as muscle activity or noises from the temporomandibular joint, it is necessary to correlate these activities. A digital optoelectronic method was therefore designed to record these activities simultaneously. It uses a closed-circuit television camera to view the movement of a light source attached to the patient's lower jaw; this is then discriminated and provides an analogue or digital output (x and y axes) based on a matrix of 300 vertical division and 400 horizontal divisions covering an area of 60×80 mm in the recording plane. The recording error for static or dynamic movement is ±2·5% and movement in the z axis increases this by an additional 2·0% per cm z axis movement. Electromyograms or temporomandibular joint noises are related using adjacent channels on a recording polygraph.
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