Importance

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Abstract

The invention relates to a device for holding a dental instrument in the head of a contra-angle, an instrument of the type comprising, in its upper part which is inserted into the head of the contra-angle, a lateral flat for rotating it and an annular groove for axially retaining it, characterized in that the shank receiving the handle of the instrument, comprises a transverse cutback (7d), offset with respect to the longitudinal axis (7e) of the shank, made in the end of the shank and emerging in the bore (7b), the width (1) of the cutback being such that it allows the handle of the instrument to be engaged so that, on the one hand, the lateral flat of the handle is in contact with the wall (7f) of the cutback, closest to the longitudinal axis (7c), so as to ensure rotational coupling, and that, on the other hand, the shoulder of the flat of the handle abuts against the bottom (7c) of the longitudinal bore (7b) of the shank, in order to act as an axial stop in the direction of insertion. Preferably, the device is in the form of a cartridge comprising, already assembled, a shank (7), a shank bearing (10), a resilient ring (8), a push-button (13) with a spring (12), and optionally a ball bearing (11).

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First Claim