Endodontic instruments

Patent metadata

Field	Value
Publication number	US-10966801-B2
Application number	US-201815871523-A
Country	US
Kind code	B2
Filing date	Jan 15, 2018
Priority date	Jun 20, 2013
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A rotatable endodontic file for cleaning/shaping a tooth root canal that includes an elongated shaft having a proximal end portion, a distal end and a tapered working portion having a rotational axis, the working portion extending from the proximal portion to the distal end; the external surface of the shaft working portion having a plurality of parallelogram-shaped cross sections along the working portion.

First claim

The invention claimed is:

1. A rotatable endodontic file for cleaning/shaping a tooth root canal, comprising:
an elongated shaft having a proximal end, a proximal end portion, a distal end and a tapered working portion having a file axis, the working portion extending from said proximal end portion to said distal end;
an external surface of said shaft working portion being defined mat least two spirals that define at least two opposing side walls of a plurality of parallelogram-shaped cross sections along the working portion, at least one of the plurality of parallelogram-shaped cross sections has a C-shaped or concave geometry along two side walls or along all four side walls,
wherein an acute angle of a first parallelogram-shaped cross section of the plurality of parallelogram-shaped cross sections is different or the same as an acute angle of a second parallelogram-shaped cross section of the plurality of parallelogram-shaped cross sections; and
wherein the acute angle of the first parallelogram-shaped cross section is larger towards the proximal end portion than the acute angle of the second parallelogram-shaped cross section towards the distal end.

2. An endodontic file according to claim 1 , wherein the acute angles of the first and second parallelogram-shaped cross sections range between 50 degrees and 85 degrees.

3. An endodontic file according to claim 1 , wherein the file is composed of a material selected from the group consisting of a Nitinol based material, Cu based material, titanium based material and a stainless steel based material.

4. An endodontic file according to claim 3 , wherein the material is processed by high temperature, cold temperatures and/or strain.

5. A rotatable endodontic file for cleaning/shaping a tooth root canal, comprising:
an elongated shaft having a proximal end, a proximal end portion, a distal end and a tapered working portion having a rotational axis, the working portion extending from said proximal end portion to said distal end;
an external surface of said shaft working, portion being defined by at least two spirals that define at least two opposing side walls of a plurality of parallelogram-shaped cross sections that extend along the working portion, at least one of the plurality of the parallelogram-shaped cross sections has a C-shaped or concave geometry along one, two, three, or four side walls, wherein an acute angle of a first parallelogram-shaped cross section of the plurality of parallelogram-shaped cross sections is different or the same as an acute angle of a second parallelogram-shaped cross section of the plurality of parallelogram-shaped cross sections; and
wherein the acute angle of the first parallelogram-shaped cross section is larger towards the proximal end than the acute angle of the second parallelogram-shaped cross section towards the distal end.

6. An endodontic file according to claim 5 wherein the acute angles of the first and second parallelogram-shaped cross sections range between 50 degrees and 85 degrees.

7. An endodontic file according to claim 5 , wherein the file is composed of a material selected from the group consisting of a Nitinol based material, Cu based material, titanium based material and a stainless steel based material.

8. An endodontic file according to claim 7 wherein the material is processed by high temperature, cold temperatures and/or strain.

9. A rotatable endodontic file for cleaning/shaping a tooth root canal, comprising:
an elongated shaft having a proximal end, a proximal end portion, a distal end and a tapered working portion having a file axis, the working portion extending from said proximal end portion to said distal end;
an external surface of said shaft working portion being defined by at least two spirals that define at least two opposing side walls of a plurality of parallelogram-shaped cross sections along the working portion, at least two of the plurality of parallelogram-shaped cross sections having an acute angle and an axis of rotation that is asymmetric such that a center of mass is not located along the file axis;
wherein a first parallelogram-shaped cross section of the at least two of the plurality of parallelogram-shaped cross sections has a first center of mass and a second parallelogram-shaped cross section of the at least two of the plurality of parallelogram-shaped cross sections has a second center of mass being different from the first center of mass of said first parallelogram-shaped cross section; and
wherein both the first center of mass of the first parallelogram-shaped cross section and the second center of mass of the second parallelogram-shaped cross section are not located along the file axis.

10. An endodontic file according to claim 9 , wherein the first parallelogram-shaped cross section has an acute angle that is larger towards the proximal end portion than an acute angle of the second parallelogram-shaped cross section towards the distal end.

11. An endodontic file according to claim 10 , wherein the acute angles of the first and second parallelogram-shaped cross sections range between 50 degrees and 85 degrees.

12. An endodontic file according to claim 9 , wherein the acute angles of the first and second parallelogram-shaped cross sections range between 50 degrees and 85 degrees.

13. An endodontic file according to claim 9 , wherein the file is composed of a material selected from the group consisting of a Nitinol based material, Cu based material, titanium based material and a stainless steel based material.

14. An endodontic file according to claim 13 , wherein the material is processed by high temperature, cold temperatures and/or strain.

Assignees

• Dentsply Sirona Inc

Inventors

• Shotton Vincent
• Ammon Dan

Classifications

• A61C5/42 Primary

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