A new audio-visual education system was devised for the demonstration and simultaneous recording of the details of tha dental operation. The system consists of the following three parts, namely, a specially designed camera and control unit, adjustable supporting unit on which hangs the camera unit and a video monitor-recorder unit.
Firstly, a dentist who sits behind the patient in the supine position properly places the camera unit in the position and controls the operation field through a glass half-mirror attached to the camera unit. The half-mirror enables one to project the view image on a color television monitor as just seen through the operator's eye.
The process of the treatment in the mouth can be recorded on the video tape or photographed or both, with the desired magnification (original magnification : 0.3-1.2) at any time without interrupting the operation.
By actually using this system it was found to be useful for the detailed demonstration of the mouth and also advantageous for preparing the audio-visual teaching aids.
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