Liquid-gas interface plasma device

• US 9,028,656 B2
• Filed: 03/31/2010
• Issued: 05/12/2015
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Colorado State University Research Foundation
• Original Assignee: Colorado State University Research Foundation
• Inventors: Koo, Il-Gyo, Choi, Myeong Yeol, Collins, Jeremiah H., Moore, Cameron A., Rahman, Abdur, Collins, George J.
• Primary Examiner(s): Tai, Xiuyu
• Application Number:
  US13/637,340
• Publication Number:
  US 20130059273A1
• Time in Patent Office: 1,868 Days
• Field of Search: 204/164, 433/86, 433/125, 433/126
• US Class Current: 204/164
• CPC Class Codes: A61C 19/06 Implements for therapeutic treatment radiation therapy A61N5/00
• CPC Class Codes: A61C 19/066 Bleaching devices; Whitening agent applicators for teeth, e.g. trays or strips
• CPC Class Codes: H05H 1/2406 using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes

Abstract

A method for whitening teeth is disclosed. The method includes supplying a liquid sufficient to at least partially submerge a portion of a tooth; positioning a plasma device adjacent to the submerged portion of the tooth; supplying ionizable media to the plasma device; and igniting the ionizable media at the plasma device sufficient to form a plasma effluent in the presence of the liquid at the distal portion, whereby the plasma effluent reacts with the liquid to form at least one reactive species that interacts selectively with foreign matter disposed on the tooth.

Claims

1. A method for whitening teeth, comprising:

supplying a liquid sufficient to at least partially submerge a portion of a tooth;

positioning a plasma device adjacent to the submerged portion of the tooth, the plasma device including an electrode formed from a metal alloy and a dielectric layer covering the electrode, wherein the dielectric layer is slidably disposed over the electrode;

supplying ionizable media to the plasma device;

igniting the ionizable media at the plasma device sufficient to form a plasma effluent in the presence of the liquid at a distal portion of the plasma device, whereby the plasma effluent reacts with the liquid to form at least one reactive species that interacts selectively with foreign matter disposed on the tooth; and

sliding the dielectric layer to adjust an exposure distance of the plasma device.

2. A method according to claim 1,

wherein the liquid includes at least one precursor feedstock having a higher chemical reactivity with the foreign matter than with the enamel of the tooth.

3. A method according to claim 2, wherein the liquid is deionized water.

4. A method according to claim 3, wherein the at least one reactive species is selected from the group consisting of hydroxide and hydrogen radicals.

5. A method according to claim 1, wherein the dielectric layer includes a distal portion extending distally past a distal end of the electrode by a predetermined distance.

6. A method according to claim 5, further comprising:

submerging the distal portion in the liquid to a desired submersion distance.

7. A method according to claim 6, further comprising:

adjusting the submersion distance to regulate temperature of the plasma effluent.

8. A method for whitening teeth, comprising:

supplying a liquid sufficient to at least partially submerge a portion of a tooth;

positioning a plasma device adjacent to the submerged portion of the tooth, the plasma device including an electrode formed from a metal alloy and a dielectric layer covering the electrode, wherein the dielectric layer is slidably disposed over the electrode;

supplying ionizable media and at least one precursor feedstock to the plasma device;

igniting the ionizable media and the at least one precursor feedstock at the plasma device sufficient to form a selectively reactive plasma effluent in the presence of the liquid at a distal portion of the plasma device, whereby the plasma effluent reacts with the liquid to form at least one reactive species that interacts selectively with foreign matter disposed on the tooth; and

sliding the dielectric layer to adjust an exposure distance of the plasma device.

9. A method according to claim 8,

wherein the at least one precursor feedstock has a higher chemical reactivity with the foreign matter than with enamel of the tooth.

10. A method according to claim 8, further comprising:

supplying a hydrophobic compound and the ionizable media to the plasma device; and

igniting the ionizable media and the hydrophobic compound at the plasma device sufficient to form the plasma effluent for depositing the hydrophobic compound on the tooth to form a hydrophobic coating thereon.

11. A method according to claim 8, wherein the dielectric layer includes a distal portion extending distally past a distal end of the electrode by a predetermined distance.

12. A method according to claim 11, further comprising:

submerging the distal portion in the liquid to a desired submersion distance.

13. A method according to claim 12, further comprising:

adjusting the submersion distance to regulate temperature of the plasma effluent.

14. A method for whitening teeth, comprising:

supplying deionized water sufficient to at least partially submerge a portion of a tooth, the plasma device including an electrode formed from a metal alloy and a dielectric layer covering the electrode, wherein the dielectric layer is slidably disposed over the electrode;

positioning a plasma device adjacent to the submerged portion of the tooth;

supplying ionizable media and at least one precursor feedstock to the plasma device; and

igniting the ionizable media and the at least one precursor feedstock at the plasma device sufficient to form a plasma effluent in the presence of the deionized water at a distal portion of the plasma device, whereby the plasma effluent reacts with the deionized water to form at least one of hydroxide and hydrogen radicals that interacts selectively with foreign matter disposed on the tooth; and

sliding the dielectric layer to adjust an exposure distance of the plasma device.

15. A method according to claim 14, wherein the dielectric layer includes a distal portion extending distally past a distal end of the electrode by a predetermined distance.

16. A method according to claim 15, further comprising:

submerging the distal portion in the deionized water to a desired submersion distance.

17. A method according to claim 16, further comprising:

adjusting the submersion distance to regulate temperature of the plasma effluent.

18. A method according to claim 14, further comprising:

supplying a hydrophobic compound and the ionizable media to the plasma device; and

igniting the ionizable media and the hydrophobic compound at the plasma device sufficient to form the plasma effluent for depositing the hydrophobic compound on the tooth and form a hydrophobic coating thereon.