FIELD: medicine; dentistry.
SUBSTANCE: on the base of measured voltage amplitudes between terminals of measuring circuit, formed by apical electrode, resistance of tooth tissues and base electrode, which is connected to outputs of generator, the complex resistance of measuring circuit is measured at any frequency. Experimental dependence of complex resistance on distance of end of apical electrode on apical narrowing of channel is found. Distance is found from the mentioned dependence. As generator the pulse oscillator is used. Pulses are applied to terminal of measuring circuit through multiplexer to any of terms in turn to have time lapse. Pulses are formed in packages. Amplitude and duration of pulses in one package are equal. Pulse duration in any other package differs from previous one.
EFFECT: improved reliability of measurement.
10 cl, 4 dwg
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