# US 11,026,765 B2 · Stabilized, water-jet slurry apparatus and method

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- Number: US 11,026,765 B2
- Document ID: US11026765B2
- Status: Granted
- Kind: B2
- Application number: 13/938,385
- Filed: 2013-07-10
- Published: 2015-01-15
- Granted: 2021-06-08
- Earliest claimed: 2013-07-10
- Assignees: H2O Tech, Inc.
- Applicants: H2O Tech, Inc.
- Inventors: Timothy D. Nelson; Daren N. Heaton
- Web page: https://patentgrep.com/patent/US11026765B2

## CPC

- A61C 3/025: Instruments acting like a sandblast machine, e.g. for cleaning, polishing or cutting teeth
- B24C 1/045: {for cutting (energy dissipating devices therefor B26F3/008)}
- B24C 11/00: Selection of abrasive materials {or additives} for abrasive blasts (polishing compositions C09G)
- C09K 3/1463: {Aqueous liquid suspensions}
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A method for removing dental material is disclosed. The method may include suspending, by a hydrated polymeric material, a quantity of abrasive media. The hydrated polymeric material and suspended abrasive media may then be pressurized. Accordingly, an abrasive stream may be formed by expelling, under pressure, the hydrated polymeric material and suspended abrasive media from a nozzle. The abrasive stream may be precisely applied to a tooth to abrade the enamel or dentin thereof as a drilling instrumentality.

## Claims

### Claim 1

A method for cutting a dental material, comprising:
forming a hydrated polymerized acrylic acid by mixing water and a polymerized acrylic acid;
neutralizing the hydrated polymerized acrylic acid with a base to ionize and uncoil the polymer chains of the polymerized acrylic acid to obtain a neutralized polymerized acrylic acid solution for use in the mouth of a patient;
mixing an abrasive media with the neutralized polymerized acrylic acid to make a slurry comprising 5 to 30 wt % abrasive media and 0.05 to 0.5 wt % of the polymerized acrylic acid, wherein the abrasive media is mechanically suspended by polymer chains of the neutralized polymerized acrylic acid for at least one month;
delivering the slurry to a nozzle, wherein the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid; and
expelling the slurry through the nozzle onto the dental material in the mouth of a patient with sufficient force so that the polymer chains of the neutralized polymerized acrylic acid are sheared, thereby reducing buildup of the neutralized polymerized acrylic acid on the dental material.

### Claim 2 (depends on 1)

The method of claim 1, wherein the abrasive media comprises a plurality of particles having an effective diameter in the range of from 20 to 30 microns.

### Claim 3 (depends on 2)

The method of claim 2, wherein the plurality of particles has an effective diameter of 25 microns.

### Claim 4 (depends on 1)

The method of claim 1, wherein the nozzle comprises an aperture having a width in the range of from 50 to 250 microns.

### Claim 5 (depends on 4)

The method of claim 4, wherein the aperture has a width ranging from 140 to 165 microns.

### Claim 6 (depends on 1)

The method of claim 1, wherein the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid for six months.

### Claim 7 (depends on 1)

The method of claim 1, wherein the slurry is delivered to the nozzle at a pressure ranging from 250 psi to 17,000 psi.

### Claim 8 (depends on 7)

The method of claim 7, wherein the pressure ranges from 500 psi to 2500 psi.

### Claim 9

A method for cutting a tooth, comprising:
forming a hydrated polymerized acrylic acid by mixing water and a polymerized acrylic acid;
neutralizing the hydrated polymerized acrylic acid with a base to ionize and uncoil the polymer chains of the polymerized acrylic acid to obtain a neutralized polymerized acrylic acid solution for use in the mouth of a patient;
mixing an abrasive media with the neutralized polymerized acrylic acid to make a slurry comprising 5 to 30 wt % abrasive media and 0.05 to 0.5 wt % of the polymerized acrylic acid, wherein the abrasive media is mechanically suspended by polymer chains of the neutralized polymerized acrylic acid;
storing the slurry so that the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid for at least one month;
delivering the slurry to a nozzle, wherein the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid; and
expelling the slurry through the nozzle onto the tooth in the mouth of a patient with sufficient force so that the polymer chains of the neutralized polymerized acrylic acid are sheared, thereby reducing buildup of the neutralized polymerized acrylic acid on the tooth.

### Claim 10 (depends on 9)

The method of claim 9, wherein the abrasive media comprises a plurality of particles having an effective diameter ranging from 20 to 30 microns.

### Claim 11 (depends on 9)

The method of claim 9, wherein the nozzle comprises an aperture having a width ranging from 50 to 250 microns.

### Claim 12 (depends on 9)

The method of claim 9, wherein the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid for six months.

### Claim 13 (depends on 9)

The method of claim 9, wherein the slurry is delivered to the nozzle at a pressure ranging from 250 psi to 17,000 psi.

### Claim 14

A method for cutting a tooth, comprising:
forming a hydrated polymerized acrylic acid by mixing water and a polymerized acrylic acid;
neutralizing the hydrated polymerized acrylic acid with a base to ionize and uncoil polymer chains of the polymerized acrylic acid and form a neutralized polymerized acrylic acid;
mixing an abrasive media with the neutralized polymerized acrylic acid to make a slurry comprising 5 to 30 wt % abrasive media and 0.05 to 0.5 wt % of the polymerized acrylic acid, wherein the abrasive media is substantially evenly distributed throughout the slurry and mechanically suspended by polymer chains of the neutralized polymerized acrylic acid so the neutralized polymerized acrylic acid mechanically blocks particles of the abrasive media from migrating within liquid of the slurry;
storing the slurry in a reservoir so that the abrasive media remains fully suspended by the polymer chains of the neutralized polymerized acrylic acid for at least six months;
pressurizing the slurry to a pressure ranging from 500 psi to 2500 psi using a pressurizing device;
delivering the pressurized slurry through a conduit to an applicator containing a nozzle, wherein the abrasive media remains suspended by the polymer chains of the neutralized polymerized acrylic acid; and
expelling the pressurized slurry through the nozzle onto the tooth in the mouth of a patient with sufficient force so that the polymer chains of the neutralized polymerized acrylic acid are sheared, thereby reducing buildup of the neutralized polymerized acrylic acid on the tooth.