Dentsply Sirona Inc.

Maillefer Instruments Holding Sarl

Gilbert Rota

Paul-Henri Vallotton

Francois Aeby

An endodontic instrument that includes a tapered rod, the rod including an active portion and a distal end, the active portion defining an envelope having a longitudinal axis that coincides with an axis of rotation of the instrument.

Instrument for drilling dental root canals

An endodontic instrument comprising a tapered rod, the rod comprising an active portion, the active portion terminating at a distal tip end of the rod and defining a conical envelope, the conical envelope having a longitudinal axis that coincides with an axis of rotation of the instrument.

An instrument for drilling dental root canals includes a tapered rod having over at least a part of its length&#x2014;the active part&#x2014;a polygonal cross-section forming at least two cutting edges, the active part terminating by a point and being defined by an envelope of cylindrical or conical shape, whose longitudinal axis coincides with the instrument's axis of rotation. The active part has a first portion extending from the point and a second portion extending following the first portion towards the rear of the active part. At least one cross-section of the first portion has a center of mass located on the axis of rotation and the cutting edges are located on the envelope. Any cross-section of the second portion has a center of mass offset with respect to the axis of rotation and at least one cutting edge defined by the cross-section is located set back.

An instrument for drilling dental root canals, includes a tapered rod having on at least an active part of its length, at least one helical flute defining at least one helical cutting edge. The instrument also has a helical hollow on a portion of the active part extending as far as the point of the rod. At least one of the edges defined by the helical hollow is coincident with the cutting edge, the hollow reducing the cutting angle of the cutting edge. Any cross-section of the active part has at least one convex side belonging to the helical flute. The closer the cross-section in question is to the point of the rod, the more the curvature at any point of the convex side increases and tends to approximate the curvature of the circumscribed circle of the cross-section and passing via the cutting edge defined by the helical flute.

A dental instrument for the extraction of an object from a root canal, comprising a shaft () having an open-end part () designed to receive at least a part of object (), this open-end part () able to be deformed to permit seizing object () by clamping and then extracting it from the root canal, is characterized in that open-end part () is tubular and is able to plastically deform, in a manner that involves a reduction of its inner section, under the effect of a given stress.

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Vaux et Chantegrue, France

Gilbert Rota