Gutta-percha remover

摘要

A gutta-percha remover suitable for removing a gutta-percha and having flexibility with good compliancy to curvature of a root canal and a superior removing capability for forming a sufficient gap bet the gutta-percha and the root canal wall is provided. The gutta-percha remover includes a shaft, a tapered working portion connected to the shaft, and one, two, or more screw-shaped grooves formed in the working portion. The cross-sections of a base end and a tip of the working portion are such that the tip of the working portion is greater in rate of the area of each cross-section to a corresponding circle circumscribing the cross-section.

主权项

1. A gutta-percha remover comprising:
a gripper to be attached to a rotational tool; a shaft connected to the gripper; a tapered working portion connected to the shaft; and one, two, or more screw-shaped grooves formed in the working portion, wherein the working portion comprises a base end and a tip, with the one, two, or more screw-shaped grooves having a gradually reducing depth from the base end toward the tip of the working portion, wherein tapering of the working portion is from 3/100 to 10/100, wherein an area of a cross-section of the tip divided by an area of a circle circumscribing the cross-section of the tip is greater than an area of a cross-section of the base end divided by an area of a circle circumscribing the cross-section of the base end, wherein the circumference of the cross-section of the tip of the working portion is formed from an arc having a length of 50% or more of the circle circumscribing the cross-section of the tip and a convex curve connecting a first end of the arc and a second end of the arc in a convex shape, wherein said convex shape extends from the first end of the arc to the second end of the arc, and the circumference of the cross-section of the base end of the working portion is formed from an arc having a length of at least 40% of the circle circumscribing the cross-section of the base end and a curve connecting both ends of the arc of the cross-section of the base in a substantially S-shaped wave that has a convex portion and a concave portion, wherein the working portion has a negative rake angle, and points where the arc and the curve of the base end meet on the circle circumscribing the cross-section of the base end, and points where the arc and the curve of the tip meet on the circle circumscribing the cross-section of the tip, are rounded, wherein the gutta-percha remover lacks a cutting blade and does not function as a cutting blade.