Variable heat-treat endodontic file

Patent metadata

Field	Value
Publication number	US-10716645-B2
Application number	US-201715789130-A
Country	US
Kind code	B2
Filing date	Oct 20, 2017
Priority date	Oct 22, 2016
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

The present disclosure relates to the field of endodontic instrumentation, and more particularly to apparatus and methods for manufacturing that include applying a variable heat-treat to an endodontic file blank based on geometric parameters that will be formed in the blank.

First claim

What is claimed is:

1. A heat-treatment for a set of Nickel-Titanium (NiTi) endodontic files, wherein for each file in the set, a heat-treatment is applied to a file blank based on a mass of a file that will be fabricated using the file blank.

2. The heat-treatment of claim 1 wherein the heat treatment is applied to the file blank based on one or more geometric parameters that will be fabricated in the file blank, the one or more geometric parameters comprising:
a) a volume of each file in the set;
b) a cross-sectional area of each file in the set;
c) a taper of each file in the set; or
d) a tip size of each file in the set.

3. The heat-treatment of claim 1 , wherein the heat-treatment customizes flexibility of each file in the set based on the mass.

4. The heat-treatment of claim 3 wherein at least one file in the set comprises a constant taper and a maximum flute diameter.

5. The heat-treatment of claim 3 wherein for each file in the set of files, the heat-treatment provides a threshold resistance of each file to torsional stress and cyclic fatigue.

6. The heat-treatment of claim 5 wherein the heat-treatment reduces a risk that any file in the set will fracture during operation.

7. A method for manufacturing an endodontic file, the method comprising applying a heat-treatment to a file blank based on a mass of the endodontic file that will be formed using the file blank after applying the heat-treatment to the file blank.

8. The method of claim 7 wherein the heat-treatment defines a percentage of superelasticity and a percentage of control memory in the endodontic file.

9. The method of claim 7 wherein, the heat-treatment provides the endodontic file with a threshold resistance to torsional stress.

10. The method of claim 7 wherein, the heat-treatment provides the endodontic file with a threshold resistance to cyclic fatigue.

Assignees

• Ormco Corp

Inventors

• Aloise Carlos A

Classifications

• C22C19/007

  with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent · CPC title

• A61C2201/007

  using shape memory effect · CPC title

• A61C5/42 Primary

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

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title

• C22F1/00

  Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title