Dentistry – Apparatus – Having condition sensor to transmit signal to regulate...
Patent
1990-02-16
1991-09-17
Cohen, Lee S.
Dentistry
Apparatus
Having condition sensor to transmit signal to regulate...
128776, 128777, A61C 1904
Patent
active
050490699
ABSTRACT:
The digital apical foramen locating apparatus of the present invention utilizes the recognized fact that the conductance from the apical foramen to a patient's lip is not only equal to the conductance from the sulcus to the lip but is also constant from patient to patient. It further utilizes the recognition that there is a linear correspondence in the change of the conductance as the apical foramen is approached in root canal therapy. Utilizing this knowledge, the present invention employs a pair of fixed resistors to calibrate a single oscillator. This same oscillator is then used in the actual measurement and a comparison is made between the measured values and the stored reference values. In addition to a digital readout in 0.1 mm increments, there is an audible display whose cadence increases as the apex is approached and a graphical display which graphically illustrates to the dentist the location of the reamer in the canal and also the status of the probe's reliability.
REFERENCES:
patent: 4353693 (1982-10-01), Dery et al.
patent: 4526179 (1985-07-01), Salesky
Cohen Lee S.
Farber Phyllis S.
Lehrer Norman E.
Pontius Kevin
Salesky Leonard
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