Dentistry – Apparatus – Hand manipulatable implement
Patent
1948-01-10
1990-02-27
Wilson, John J.
Dentistry
Apparatus
Hand manipulatable implement
433 81, 433102, A61C 308
Patent
active
049041851
ABSTRACT:
In one embodiment, a condenser instrument for thermomechanically condensing a thermoplastic material, such as gutta percha, in the extirpated root canal of a tooth through rotation of the instrument is disclosed. The condenser instrument includes a shank having a tapered working portion along part of its length. The working portion includes a single, continuous helical flute defining a continuously helical shoulder having a negative rake angle. The shoulder is generally directed downwardly toward the tip end of the shank. A wide land is formed at the periphery of the shoulder. In a second embodiment, a remover instrument for removing a thermoplastic material, such as gutta percha, from a previously obturated root canal of a tooth through rotation of the remover instrument is disclosed. The remover instrument includes a shank having a tapered working portion along part of its length. The working portion includes a single, continuous helical flute defining a continuous helical shoulder having a negative rake angle. The shoulder is generally directed upwardly away from the tip of the shank. A wide land is formed at the periphery of the shoulder.
REFERENCES:
patent: 498554 (1893-05-01), Johanson
patent: 1307446 (1919-06-01), Kerr
patent: 1694857 (1928-12-01), Kulik
patent: 4538989 (1985-09-01), Apairo, Jr. et al.
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