Dentistry – Apparatus – Having gauge or guide
Patent
1998-11-12
2000-05-09
Lucchesi, Nicholas D.
Dentistry
Apparatus
Having gauge or guide
128776, A61C 1904
Patent
active
060595698
ABSTRACT:
The present invention provides an apical position detection apparatus for accurately detecting the fact that a measuring electrode arrives at the apical position. The apparatus has a first current value measuring means for measuring a first frequency value by supplying a first frequency signal between the measuring electrode and the oral electrode, a second current value measuring means for measuring a second frequency value by supplying a second frequency signal between the measuring electrode and the oral electrode, arithmetic means for obtaining logarithmically converted calculation value by using a first measurement signal and a second measurement signal, and position signal formation means for obtaining an apical position detecting signal by addition or subtraction of the first measurement signal and the arithmetic value.
REFERENCES:
patent: 5017134 (1991-05-01), Saito et al.
patent: 5096419 (1992-03-01), Kobayashi et al.
patent: 5211556 (1993-05-01), Kobayashi et al.
Lucchesi Nicholas D.
Toei Electric Co., Ltd.
Whitesel J. Warren
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