Dentistry – Miscellaneous
Patent
1987-03-11
1989-01-10
Jones, Larry
Dentistry
Miscellaneous
433215, A61C 500
Patent
active
047971010
ABSTRACT:
A recess is drilled into the buccal face of a tooth of a human subject, and a microdot having identifying information thereon is placed at the bottom of said recess whereafter the recess is filled with a transparent bonding material. When identification of the subject is desired, the microdot is photographed through the transparent filler material to provide a photographic print which contains the identifying information. The camera employed includes a fixture extending forwardly of the lens for accurately locating the camera lens relative to the microdot, the camera having a fixed focus lens whose focal length corresponds to the distance between the lens and the buccal face of the tooth plus the depth of the recess containing the microdot. A special technique, and an associated calibration instrument, are used for drilling the recess in the subject's tooth to a precise depth to assure that a sharp image of the microdot is obtained when the microdot is photographed by the fixed focus camera.
REFERENCES:
patent: Re30594 (1977-06-01), Samis
patent: 3925896 (1975-12-01), McDowell
patent: 4208795 (1980-06-01), Muhlemann et al.
patent: 4239261 (1980-12-01), Richardson
patent: 4306866 (1981-12-01), Weissman
patent: 4439154 (1984-03-01), Mayclin
patent: 4512744 (1985-04-01), Michnick et al.
patent: 4557693 (1985-12-01), Elggren
Promotional Literature of Micro I/D Inc., Peoria, Ill., distributed 1985 (?).
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