Dental stethoscope
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United States of America Patent
Stats
-
Nov 24, 1981
Grant Date -
N/A
app pub date -
Apr 28, 1980
filing date -
Aug 9, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A measurement channel oscillator and a reference channel oscillator are provided in combination, a measurement probe and a mouth mucose lead element are respectively connected to the measurement channel oscillator, while one of a plurality of equivalent circuits each consisting of a pair of equivalent capacitor and equivalent resistor connected in parallel is selectively connected to the reference channel oscillator, the respective equivalent circuits corresponding to different stages of a decayed tooth, and the outputs of the measurement channel oscillator and the reference channel oscillator are respectively connected through the respective channels of a 2-channel stereo amplifier to a stereo head-phone, whereby an erosion stage of a decayed tooth can be correctly examined even if it is located at a hardly visible position in the mouth.
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