公开(公告)号：US20240341919A1

公开(公告)日：2024-10-17

申请号：US18494987

申请日：2023-10-26

Applicant: NOVABRUSH LTD.

Inventor： Vasily Olegovich VDOVIN

IPC: A61C5/42

CPC classification number: A61C5/42 ,  A61C1/12 ,  A61C2201/00

Abstract: The present invention relates to dentistry, and particularly, to a rotary endodontic finishing file used for root canal treatment. The endodontic finishing file comprises a shank for inserting in an endodontic motor handpiece, and a core of twisted metal braids secured in the shank, the said core being provided with an outer braid made of wire wound over the core. The length of the braid is less than the length of the core. At the braid-free end of the core, a brush of the core braids is formed. The winding of the wire of the outer braid is made in four layers, the winding of the first and third layers is made in the direction from the shank to the brush without a gap between the adjacent coils in each layer, the winding of the second and fourth layers is made in the opposite direction, providing the possibility of securing both ends of the braid wire in the shank. The winding pitch in the second and fourth layers is 8 to 10 times greater than the winding pitch in the first and third layers of the braid, the winding length of the third and fourth layers in the direction from the shank to the brush is less than the winding length of the first and second layers. The core is made of three twisted elastic tungsten wires, the open ends of which, located in the braid-free portion of the core, are of a cylindrical helix shape and curved in the form of a conical helix with an increasing pitch of turns for each strand of the core, whereby the curved ends of the brush wires are inserted into the canal separately and sequentially one after another with the motor turned off, each inserted wire being pressed against the walls of the canal during the insertion of the file. The proposed technical solution allows to provide high-quality and safe treatment, reduce the risk of injury during treatment, and also increase the service life of the endodontic file.