Abstract
During this century, many sorts of recording apparatus have been developed for the study of mandibular movement. Main principle of these recorders is mechanical, photographic or electric. The electric recorder has many advantages over the photographic recorder or the mechanical recorder. For example, the electric recorder can amplify the micro portion of mandibular movement and makes possible an observation of the time-course changes in mandibular movement and also a simultaneous operation of another kind of biological signal recorder like electromyograph. The conventional electric recorders, however, must be improved further because they have a disadvantage concerning accurate recording of the physiological mandibular movement. For these reasons, the author developed a new type apparatus of the mandibular movement recorder appling the semiconductor position sensitive detector (PSD). This new recording apparatus consists of the amplification circuit and the analogue computer. The principle of this recorder is that the physiological mandibular movement is converted to the secondary dimensional output voltage and recorded. The results of the experiment with this new developed recording apparatus were as follows : 1. The output voltage of this apparatus showed the position linearity following to the movement of the target. 2. The output voltage error on the observing area (10×10cm) was limited to 2 percent. 3. The minimum distance of resolution was 0.1mm. 4. The displacement of vertical direction against the observing facet was stable within ±1.5cm. 5. The output voltage of PSD was most stable at 40mA forward current of light emitting diode (LED). On the other hand, the larger, effective aperture of lens gave higher output voltages of PSD. 6. The relationship beween the distance of LED and sensor, and the output voltage of PSD was in inverse proportion to a square of the distance between LED and sensor. 7. This new recording apparatus can be operated with electromyograph at the same time without trouble. From these results, it may be concluded that this recording apparatus is the most suitable apparatus for the further research of physiological movement of the mandible.
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