Endodontic instrument for drilling the root canals of a tooth

An endodontic instrument, particularly an instrument for drilling a root canal in a patient's tooth, the instrument (10) defining a longitudinal axis and comprising:

• a working area (11) for at least one of forming, shaping, and cutting a wall of a root canal (21) of a tooth (20), and the working area (11) being equipped with a supporting end piece (13) that is attachable to a mounting (14),
• at least the working area (11) having a retracted configuration that is at least partially rectilinear in shape,
• when the instrument (10) is in an inoperative position, the instrument being in a martensitic phase,
• when the instrument is in a working position, an expanded structured configuration of the working area (11) adapting to a shape of the root canal with the instrument then being in an austenitic phase, and
• passage from the martensitic phase to the austenitic phase being triggered by a first predetermined variation in a temperature of the instrument, and a return of the instrument, from the austenitic phase to the martensitic phase, being triggered by a second predetermined variation in the temperature of the instrument.

An endodontic instrument for drilling a root canal in a tooth of a patient, the instrument (10) defining a longitudinal axis and comprising:

• a working area (11) for at least one forming, shaping, and cutting a wall of the root canal (21) of the tooth (20), and the working area (11) being connected to a supporting end piece (13);
• a mounting couples the supporting end piece which supports the working area;
• the working area (11) having both a martensitic phase and an austenitic phase depending on a temperature of the instrument;
• the instrument, in the martensitic phase, being in an inoperative position in which the working area assumes a retracted configuration and is at least partially rectilinear in shape;
• the instrument, in the austenitic phase, being in a working position in which the working area assumes an expanded structured configuration and being shaped in a shape of the root canal;
• and
• once the temperature of the instrument experiences a first predetermined variation, the working area transitions from the martensitic phase to the austenitic phase, and once the temperature of the instrument experiences a second predetermined variation the working area transitions from the austenitic phase to the martensitic phase.