Contra-angle head for endodontic instrument

Details Contra-angle head for endodontic instrument Contra-angle head for endodontic instrument

1994-03-24

1995-09-26

Lucchesi, Nicholas D.

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

433118, A61C 107, A61C 303, A61C 308

Patent

active

054530083

ABSTRACT:
A dental handpiece head comprises a tool holder (17) driven by an eccentric crankpin (10) engaged in a vertical groove (18) of the tool holder. The axial displacement of the tool holder is limited by a finger (13) engaged in a transverse cutting (12) of the tool holder, the walls of which cutting define two axial limit stops. The relative position of these limit stops and of the groove (18) is such that when the tool holder is pushed back by the reaction to the penetration of the tool into the dental canal, the tool holder is driven only in alternating rotation, whereas it is driven in a combined rotational and translational movement when a traction force is exerted on the tool.
This construction has the effect of suppressing the percussions of the tool in the tooth.

REFERENCES:
patent: 610987 (1898-09-01), Hendrickson et al.
patent: 3073031 (1963-01-01), Brenman et al.
patent: 4175324 (1979-11-01), Arai
patent: 4460341 (1984-07-01), Nakanishi
patent: 4544356 (1985-10-01), Gardella et al.
patent: 4834653 (1989-05-01), Edwardson
International Search Report of Counterpart Swiss Application 1105/93.

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