Instrument for drilling dental root canals

Patent metadata

Field	Value
Publication number	US-11523880-B2
Application number	US-202117161111-A
Country	US
Kind code	B2
Filing date	Jan 28, 2021
Priority date	Jan 30, 2013
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

An endodontic instrument that includes a tapered rod, the rod including an active portion and a distal end, the active portion defining an envelope having a longitudinal axis that coincides with an axis of rotation of the instrument.

First claim

The invention claimed is:

1. An endodontic instrument comprising:
a tapered rod, the rod comprising an active portion and a distal end, the active portion defining an envelope having a longitudinal axis that coincides with an axis of rotation of the instrument;
the active portion comprising a plurality of helical flutes disposed along at least a segment of the active portion, the plurality of helical flutes comprising a first flute, a second flute, a third flute, and a fourth flute;
the active portion comprising a plurality of edges, the plurality of edges comprising a first edge intersecting the first flute and the second flute, a second edge intersecting the second flute and the third flute, a third edge intersecting the third flute and the fourth flute, and a fourth edge intersecting the first flute and the fourth flute;
the active portion comprising a first cross-section, each of the first edge, the second edge, the third edge, and the fourth edge intersecting the first cross-section;
the first cross-section being a first parallelogram such that the intersections of the first and third edges with the first cross-section are disposed opposite one-another in the first parallelogram, and the intersections of the second and fourth edges with the first cross-section are disposed opposite one-another in the first parallelogram;
the active portion comprising a second cross-section, each of the first edge, the second edge, the third edge, and the fourth edge intersecting the second cross-section;
the second cross-section being a second parallelogram such that the intersections of the first and third edges with the second cross-section are disposed opposite one-another in the second parallelogram, and the intersections of the second and fourth edges with the second cross-section are disposed opposite one-another in the second parallelogram;
wherein the intersections of the first cross-section with the first and third edges are both located on the envelope, and the intersections of the first cross-section with the second and fourth edges are both located within the envelope; and
wherein the intersection of the second cross-section with the first edge is located on the envelope, and the intersections of the second cross-section with the second, third, and fourth edges are each located within the envelope.

2. The endodontic instrument of claim 1 , wherein a center of mass of the second cross-section is offset from the axis of rotation.

3. The endodontic instrument of claim 2 , wherein a center of mass of the first cross-section is centered on the axis of rotation.

4. The endodontic instrument of claim 3 , wherein the first cross-section is disposed within a first portion of the active portion, wherein every cross-section of the first portion is a centered on the axis of rotation.

5. The instrument of claim 4 , wherein the first cross-section is disposed between the distal end and the second cross-section, and the first portion has a length between 1 and 3 millimeters.

6. The instrument of claim 5 , wherein the first portion extends from a tip at the distal end of the rod.

7. The endodontic instrument of claim 1 , wherein the active portion further comprises a third cross-section, each of the first edge, the second edge, the third edge, and the fourth edge intersecting the third cross-section:
the third cross-section being a third parallelogram such that the intersections of the first and third edges with the third cross-section are disposed opposite one-another in the third parallelogram, and the intersections of the second and fourth edges with the third cross-section are disposed opposite one-another in the third parallelogram;
wherein the intersections of the third cross-section with the first and third edges are both located on the envelope, and the intersections of the third cross-section with the second and fourth edges are both located within the envelope; and
wherein the second cross-section is disposed between the first cross-section and the third cross-section along a length of the active portion.

8. The endodontic instrument of claim 7 , wherein the active portion further comprises a fourth cross-section, each of the first edge, the second edge, the third edge, and the fourth edge intersecting the fourth cross-section;
the fourth cross-section being a fourth parallelogram such that the intersections of the first and third edges with the fourth cross-section are disposed opposite one-another in the fourth parallelogram, and the intersections of the second and fourth edges with the fourth cross-section are disposed opposite one-another in the fourth parallelogram;
wherein the intersection of the fourth cross-section with the third edge is located on the envelope, and the intersections of the fourth cross-section with the first, second, and fourth edges are each located within the envelope; and
wherein the third cross-section is disposed between the second cross-section and the fourth cross-section along the length of the active portion.

9. The endodontic instrument of claim 8 , wherein a center of mass of the first cross-section is centered on the axis of rotation, a center of mass of the second cross-section is offset from the axis of rotation, a center of mass of the third cross-section is centered on the axis of rotation, and a center of mass of a fourth cross-section is offset from the axis of rotation.

10. The endodontic instrument of claim 7 , wherein the first cross-section is disposed within a first portion of the active portion, every cross-section of the first portion being a parallelogram in which two opposed edges are located on the envelope, and two opposed edges are located within the envelope.

11. The instrument of claim 10 , wherein the first cross-section is disposed between the distal end and the second cross-section, and the first portion has a length between 1 and 3 millimeters.

12. The instrument of claim 11 , wherein the first portion extends from a tip at the distal end of the rod.

13. The endodontic instrument of claim 1 , wherein the first cross-section is disposed within a first portion of the active portion, every cross-section of the first portion being a parallelogram in which two opposed edges are located on the envelope, and two opposed edges are located within the envelope.

14. The instrument of claim 13 , wherein the first cross-section is disposed between the distal end and the second cross-section, and the first portion has a length between 1 and 3 millimeters.

15. The instrument of claim 14 , wherein the first portion extends from a tip at the distal end of the rod.

16. The endodontic instrument of claim 1 , wherein the first cross-section is disposed within a first portion of the active portion, wherein every cross-section of the first portion is a centered on the axis of rotation.

17. The instrument of claim 16 , wherein the first cross-section is disposed between the distal end and the second cross-section, and the first portion has a length between 1 and 3 millimeters.

18. The instrument of claim 17 , wherein the first portion extends from a tip at the distal end of the rod.

Assignees

• Dentsply Sirona Inc

Inventors

• Rota Gilbert
• Vallotton Paul-Henri

Classifications

• A61C5/40 Primary

  Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots · CPC title

• A61C5/42 Primary

  Files for root canals; Handgrips or guiding means therefor · CPC title