Electro-conductive and anti-bacterial composite material, for endodontic use

Patent metadata

Field	Value
Publication number	US-11484476-B2
Application number	US-201616339961-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Oct 6, 2016
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

A gutta-percha-silver composite with determined weight percentage and particle size, is provided. The composite exhibits electro-conductivity greater than the standard gutta-percha composites. The new material simplifies root canal treatments, shortens the times both for clinician and patients, and reduces the exposure to patients from X-rays. The material is not only electro-conductive; it is anti-bacterial, which improves the outcomes of the procedures. Also, it has improved thermal conductivity, and mechanical properties.

First claim

The invention claimed is:

1. An endodontic filling material for root canal treatment, comprising:
a gutta-percha-based material; and
a metallic powder having particles greater than 10 μm, wherein at least 70% by weight of the metallic powder is mixed with the gutta-percha-based material so as to form a mixture exhibiting electro-conductivity that is detectable with an electronic apex-locator.

2. The endodontic filling material of claim 1 , wherein the metallic powder is a powder of at least one of silver, titanium, stainless steel, graphite, aluminium, copper, and gold, or mixtures thereof.

3. The endodontic filling material of claim 2 , wherein the metallic powder is a silver powder.

4. The endodontic filling material of claim 1 , wherein the amount of the metallic powder in the mixture is 70-80% by weight.

5. The endodontic filling material of claim 1 , wherein the metallic powder particles have an elongated shape.

6. The endodontic filling material of claim 1 , wherein the gutta-percha-based material includes one paste and one powder material comprising more than 20% gutta-percha.

7. An endodontic filling material for root canal treatment comprising:
a gutta-percha-based material; and
a metallic powder, wherein the metallic powder is mixed with the gutta-percha-based material in sufficient quantity to form a mixture exhibiting electro-conductivity that is detectable with an electronic apex-locator, and
wherein the gutta-percha-based material includes one paste and one powder material comprising 20% gutta-percha, 66% zinc oxide and 11% heavy metals powder.

8. The endodontic filling material of claim 1 , wherein the gutta-percha-based material includes an anti-bacterial powder component.

9. The endodontic filling material of claim 8 , wherein the anti-bacterial powder is selected from the group consisting of silver, titanium, iron, gold, copper, platinum, aluminum, molybdenum, zinc, tungsten, brass, carbon, nickel, palladium, tin, carbon steel, stainless steel, mercury, and their alloys, and mixtures thereof.

10. The endodontic filling material of claim 1 , wherein the endodontic filling material has antibacterial properties and assists in infection control after an endodontic procedure.

11. The endodontic filling material of claim 1 , wherein the endodontic filling material has X-ray radiopacity.

12. An endodontic point for root canal treatment, comprising:
the endodontic filling material of claim 1 , wherein the mixture formed from the gutta-percha-based material and the metallic powder is formed into a point.

13. A method for performing root canal treatment, the method comprising the steps of:
forming an opening in a crown of a tooth;
removing tissue in a root canal system of the tooth;
shaping the root canal;
placing the endodontic point of claim 12 into the root canal;
determining when the endodontic point is at the root canal apex with an electronic apex-locator;
stabilizing the endodontic point in place in the root canal; and
filling the opening.

14. The method of claim 13 , wherein the method further includes the step of taking an X-ray of the tooth after the point is placed in the root canal so as to view the location of the point due to its radiopacity.

15. The method of claim 13 , wherein the method further includes the step of adding an anti-bacterial powder component to the gutta-percha-metal powder material of the endodontic point.

16. The method of claim 15 , wherein the anti-bacterial powder is selected from the group consisting of silver, titanium, iron, gold, copper, platinum, aluminum, molybdenum, zinc, tungsten, brass, carbon, nickel, palladium, tin, carbon steel, stainless steel, mercury, and their alloys, and mixtures thereof.

17. The method of claim 13 , wherein the metallic powder of the endodontic point is a silver powder, and the composition of silver powder in the mixture of the endodontic filling material is greater than 50% by weight.

18. The method of claim 17 , wherein the silver powder is comprised of particles that are elongated in shape and have a size greater than 0.1 micrometers.

Assignees

• Univ Hong Kong

Inventors

• Savoldi Fabio
• Matinlinna Jukka Pekka
• Tsoi Kit Hon James
• Paganelli Corrado
• Visconti Luca
• Rasia Dal Polo Giovanni

Classifications

• A61K33/38

  Silver; Compounds thereof · CPC title

• A61K6/54

  Filling; Sealing · CPC title

• A61K6/56

  Apical treatment · CPC title

• A61K6/52 Primary

  Cleaning; Disinfecting · CPC title

• A61K6/842

  Rare earth metals · CPC title