IMPROVEMENTS INTRODUCED IN DRILL FOR CERVICAL PREPARATION OF RADICLE CHANNELS

摘要

Improvements introduced in a drill for cervical root canal preparation. more precisely, these are improvements in the field of endodontics or prosthesis, which is sized, treated and shaped to present a cutting profile suitable for working laterally dentin of the root canals, reducing accidents during the operation; the drill (1) is formed by the tapered sector (s) and cutting sector (p) with smaller initial diameter (a) and larger final diameter (b), besides a cutting length (c), and the sector (p) is preferably formed with 04 (four) cutting edges (2) and inactive (non-cutting) tip (3) for root canal treatment and optionally with active (cutting) tip (4) for retraction or removal of obturator materials from previous endodontic treatments; Completing the conformation of the drill, the cutting sector (p) develops into the tapered sector (s) that interconnects with the cylindrical base (d) on the micro motor assembly; the cutting edges (2) are preferably positioned 900 ° from the center of rotation, axially aligned with respect to the taper and axis of rotation (e) of the instrument (1); the cutting edges (2) have two cutting directions, namely: a) direction in the lateral cut, that is, in the direction of the radius of the instrument, both in advance and in return and b) cut in the longitudinal direction of the turning axis (e ), promoted by the larger taper diameter of the cutting area forming sharp corners (q).