Method and apparatus for apical detection with complex impedance

Details Method and apparatus for apical detection with complex impedance Method and apparatus for apical detection with complex impedance

1996-09-25

1998-06-02

Jaworski, Francis

Surgery

Diagnostic testing

Measuring electrical impedance or conductance of body portion

600590, A61B 505

Patent

active

057591598

ABSTRACT:
An apical position detector for use in dental endodontics includes an electronic controller coupled to a conductive probe and a lip electrode. The probe is positioned in a root canal and the lip electrode contacts another location on the patient's body. The controller produces a test signal as a combination of signals at selected frequencies. The controller then monitors a voltage of the probe and extracts the amplitude and phase of each of the frequency components of the voltage at the probe. Test scores are generated from summations of the amplitudes and/or phases of the various frequency components to determine when the impedance between the probe and the lip electrode changes from a primarily reactive impedance to a primarily resistive impedance. A first test score is displayed to indicate when the impedance changes from a reactive to a resistive impedance. The second test score indicates when the measurement conditions are unsatisfactory. The test scores are displayed in bar graph or similar form.

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