Digital apical foramen locating apparatus

Details Digital apical foramen locating apparatus Digital apical foramen locating apparatus

1983-01-28

1985-07-02

Cohen, Lee S.

Surgery

Truss

Pad

433 27, 128777, A61C 1904, A61B 505

Patent

active

045261792

ABSTRACT:
A numeric readout device is provided to display the distance of an instrument in a tooth from the peridontal membrane surrounding the tooth, including a pair of oscillator circuits with a numerical relationship determinator reading a distance measurement depended upon the impedance between the instrument and the gingival sulcus.

REFERENCES:
patent: 3058225 (1962-10-01), Ward
patent: 3993044 (1976-11-01), McGuffin
patent: 4083366 (1978-04-01), Gombrich et al.
patent: 4192321 (1980-03-01), Korber et al.
patent: 4193408 (1980-03-01), Fujino
patent: 4273531 (1981-06-01), Hasegawa
patent: 4353693 (1982-10-01), Dery et al.

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