Patent ID: 9155595
Filing Date: 2015-10-13
Classification: A61C

Abstract:
1. An endodontic file for root canal treatment, the endodontic file comprising an elongated body having a length and having a distal end configured to first penetrate into the root canal when in use, and a proximal end to which a force is applied to allow penetration of the distal end into the root canal when in use, said elongated body being configured as a rotatable screw member made of a shape memory and superelastic material composition, and having helical screw cutting blades arranged with core spaces between the blades, wherein the helical screw cutting blades and the core spaces therebetween, within a proximal portion of the elongate body, are coated with a friction-reducing coating comprising nanostructures of (a) metal or metal alloy and (b) inorganic fullerene-like (IF) nanoparticles or a composite containing such IF nanoparticles, while the helical screw cutting blades of the elongated body are uncoated within a distal portion of the elongate body, wherein said distal portion is distal to said proximal portion, the elongated body thereby having a non-uniform distribution of the friction-reducing coating.