Dentistry – Apparatus – Hand manipulatable implement
Patent
1982-09-24
1984-12-04
Wilson, John J.
Dentistry
Apparatus
Hand manipulatable implement
433218, 29239, A61C 300
Patent
active
044861770
ABSTRACT:
A crown removal tool comprising an elongated hollow cylindrical body having at one end perpendicularly protruding tangs and a slot opening formed therebetween, the tangs adapted to engage one side of a groove formed in a patient's tooth crown, the device additionally comprising an inner rod slidable in the central elongated opening of the hollow cylindrical body, the inner rod having at one end a perpendicularly protruding tang slidably residing in the slot formed between the pair of tangs attached to the hollow cylindrical body, the inner rod tang adapted to engage the other side of the groove formed in a patient's tooth crown, the other end of the inner rod being threaded and having a rotatable nut thereon, the nut adapted to be screwed against the end of the hollow cylindrical body whereby rotation of the nut while engaging the end of the hollow cylindrical body draws the tang attached to the inner rod away from the tangs attached to the hollow cylindrical body. A cap unit resides on the end of the inner body threaded end to limit movement of the threaded nut so that when the threaded nut is against the cap end, the tang of the inner rod aligns with the tangs of the cylindrical hollow body and the tool tangs may be placed in the crown groove whereupon by screwing of the rotatable nut, the tangs are forced apart and the crown fractured which permits its removal.
REFERENCES:
patent: 425650 (1890-04-01), Bing
patent: 606460 (1898-06-01), Ivory
patent: 1349464 (1920-08-01), Lancit et al.
patent: 1357870 (1920-11-01), Hume
patent: 2220103 (1940-11-01), Hanssen
patent: 3426752 (1969-02-01), Laico
patent: 4179816 (1979-12-01), Anderson
patent: 4196520 (1980-04-01), Hoffman
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