Dental abutment screw extractor

Patent metadata

Field	Value
Publication number	US-10537410-B2
Application number	US-201515500467-A
Country	US
Kind code	B2
Filing date	Aug 11, 2015
Priority date	Aug 12, 2014
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

Described herein are systems and methods for extracting a broken fragment of a dental abutment screw from a dental implant. One system includes an extractor tool having a tubular outer body and a conductor positioned within the tubular outer body, and an applicator that receives and end of the extractor tool and also includes a heating element that converts electrical energy into heat that is conducted to the extractor tool to melt a thermoplastic adhesive in a cavity at the distal end of the extractor tool, such that the melted thermoplastic adhesive can conform to and engage with a broken fragment of a dental abutment screw within a dental implant when the adhesive cools. The extractor tool can then be rotated to unscrew the broken fragment from the dental implant.

First claim

The invention claimed is:

1. A method for extracting a broken fragment of a dental abutment screw from a dental implant in a patient's mouth, the method comprising:
mounting a proximal end of an extraction tool in a hand-held applicator, prior to positioning the extraction tool in the patient's mouth, wherein mounting a proximal end of the extraction tool in the hand-held applicator comprises:
opening a collet of the hand-held applicator;
inserting the proximal end of the extraction tool into the collet; and
closing the collet to secure the extraction tool to the hand-held applicator;

applying heat to a thermoplastic adhesive in a distal end portion of the extraction tool via the hand-held applicator to melt the thermoplastic adhesive;
positioning the extraction tool in the patient's mouth such that the thermoplastic adhesive in the distal end portion of the extraction tool contacts the broken fragment of the dental abutment screw that is mounted within the dental implant in the patient's mouth;
wherein the application of heat to the thermoplastic adhesive occurs before or after the extraction tool is positioned in the patient's mouth;
allowing the melted thermoplastic adhesive to conform to surfaces of the broken fragment;
allowing the thermoplastic adhesive to cool such that it solidifies around the broken fragment; and
rotating the extraction tool to unscrew the broken fragment from the dental implant;
detaching the extraction tool from the hand-held applicator after applying heat to the thermoplastic adhesive and prior to rotating the extraction tool.

2. The method of claim 1 , wherein applying the heat to the thermoplastic adhesive comprises supplying power to a heating element in the hand-held applicator while it is coupled to the proximal end of the extraction tool.

3. The method of claim 2 , wherein supplying the power to the heating element in the hand-held applicator comprises pressing a button on the hand-held applicator to provide a predetermined level of electrical power to the heating element for a predetermined period of time.

4. The method of claim 1 , wherein allowing the thermoplastic adhesive to cool comprises blowing air on the extraction tool to cause conduction of heat from the thermoplastic adhesive into the extraction tool.

5. The method of claim 1 , wherein opening the collet comprises depressing a plunger at a proximal end of the hand-held applicator and closing the collet comprises releasing the plunger.

6. The method of claim 1 , further comprising urging the distal end portion of the extraction tool toward the broken fragment while the thermoplastic adhesive is at least partially melted to cause a portion of the broken fragment to move into a cavity in the distal end portion of the extraction tool.

7. A method for extracting a broken fragment of a dental abutment screw from a dental implant in a patient's mouth, the method comprising:
positioning an extraction tool in the patient's mouth such that a thermoplastic adhesive in a distal end portion of the extraction tool contacts the broken fragment of the dental abutment screw that is mounted within the dental implant in the patient's mouth;
applying heat to the thermoplastic adhesive to melt the thermoplastic adhesive via a hand-held applicator, wherein the application of heat to the thermoplastic adhesive occurs before or after the extraction tool is positioned in the patient's mouth;
allowing the melted thermoplastic adhesive to conform to surfaces of the broken fragment;
allowing the thermoplastic adhesive to cool such that the thermoplastic adhesive solidifies around the broken fragment;
rotating the extraction tool to unscrew the broken fragment from the dental implant;
wherein the method further comprises:
mounting a proximal end of the extraction tool in the hand-held applicator, prior to positioning the extraction tool in the patient's mouth, and
applying the heat to the thermoplastic adhesive via the hand-held applicator to melt the thermoplastic adhesive; and

wherein mounting the proximal end of the extraction tool in the hand-held applicator comprises:
opening a collet of the hand-held applicator,
inserting the proximal end of the extraction tool into the collet, and
closing the collet to secure the extraction tool to the hand-held applicator.

8. The method of claim 7 , wherein applying the heat to the thermoplastic adhesive comprises supplying power to a heating element in the hand-held applicator while it is coupled to the proximal end of the extraction tool.

9. The method of claim 8 , wherein supplying the power to the heating element in the hand-held applicator comprises pressing a button on the hand-held applicator to provide a predetermined level of electrical power to the heating element for a predetermined period of time.

10. The method of claim 7 , wherein allowing the thermoplastic adhesive to cool comprises blowing air on the extraction tool to cause conduction of heat from the thermoplastic adhesive into the extraction tool.

11. The method of claim 7 , wherein opening the collet comprises depressing a plunger at a proximal end of the hand-held applicator and closing the collet comprises releasing the plunger.

12. The method of claim 7 , further comprising urging the distal end portion of the extraction tool toward the broken fragment while the thermoplastic adhesive is at least partially melted to cause a portion of the broken fragment to move into a cavity in the distal end portion of the extraction tool.

Assignees

• Univ Of Pittsburgh—Of The Commonwealth System Of Higher Education

Inventors

• Kukunas Steve J
• Smoots Ashley
• Smith Hannah M
• Kukunas Paul
• Sun Fanying
• Hughes Tyler

Classifications

• A61C8/00 Primary

  Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools (fastening of peg-teeth in the mouth A61C13/30) · CPC title

• A61B2017/00955

  thermoplastic · CPC title

• A61C8/0089 Primary

  Implanting tools or instruments · CPC title

• A61B17/92

  Impactors or extractors, e.g. for removing intramedullary devices {(insertion or extraction of artificial joints A61F2/4603)} · CPC title

• A61C3/16

  Dentists' forceps {or clamps} for removing crowns · CPC title