Dentistry – Apparatus – Having intra-oral dispensing means
Patent
1981-03-03
1982-12-07
Peshock, Robert
Dentistry
Apparatus
Having intra-oral dispensing means
433 40, 433220, 433224, A61C 502
Patent
active
043625088
ABSTRACT:
For the production of a core for a root-filled prepared tooth the root canal (11) of the prepared tooth (10) is filled with an impression material (27) which is injected at the bottom of the root canal to successively fill the root canal from the bottom thereof and outwardly under expulsion of air therefrom. The injection is carried out with the aid of an injection needle (23) with an injection syringe cylinder (24) with piston (25) attached thereto, the cylinder being filled with said impression material and the injection needle serving as reinforcing element for the impression material, permitting extraction of the cast from the root canal after the impression material has set. In addition to the injection needle with the syringe cylinder and piston attached thereto the apparatus may comprise a mould (13, 14) formed as a guide for the injection needle (23) and adapted to be applied to the prepared tooth (10) for taking a simultaneous cast of the root canal (11) and the free prepared tooth surface (12) of the tooth.
REFERENCES:
patent: 2349607 (1944-05-01), Berger
patent: 3949748 (1976-04-01), Malmin
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