Impression and foundation system for implant-supported prosthesis

• US 6,056,547 A
• Filed: 03/05/1997
• Issued: 05/02/2000
• Est. Priority Date: 03/05/1997
• Status: Expired due to Fees

• Current Assignee: Medentech, Inc.
• Original Assignee: Medentech, Inc.
• Inventors: Names, Curtis D.
• Primary Examiner(s): Lucchesi, Nicholas D.
• Application Number:
  US08/811,494
• Time in Patent Office: 1,154 Days
• Field of Search: 433/172, 433/173, 433/213, 433/214
• US Class Current: 433/173
• CPC Class Codes: A61C 8/0001 Impression means for implants, e.g. impression coping
• CPC Class Codes: A61C 8/0048 Connecting the upper structure to the implant, e.g. bridging bars A61C8/0028 takes precedence
• CPC Class Codes: A61C 9/0006 Impression trays

Abstract

A system and method for forming a framework of foundation elements as a component of and foundation for an impression and to support a prosthesis to form a final restoration in a patient. The foundation elements and the prosthesis may be made of the same or similar prosthetic material, or of a metallic or metal alloy material. Each foundation element includes a base member defining a bore therethrough and at least one elongate member extending from the base member. To form the framework, each foundation element is attached to an implant in a patient and a free end of the elongate member is oriented and cut such that it optimally contacts a base member of an adjacent foundation element and is rigidly bonded thereto. A rigid framework is thereby produced which is used to produce the impression. The impression is removed from the patient and a master model is made therefrom. The rigid framework is removed from the impression material and placed along with the master model in an articulator. A prosthesis is molded or sculpted onto the rigid framework and the prosthesis is then attached to the implants in the patient. Gaps in the prosthesis are then sealed.

Claims

1. A method for forming a final biocompatible implant supported restoration comprising a framework and a prosthesis, wherein'"'"'said framework comprises foundation elements used for taking an impression of implants in a patient and the same framework is used as a component of the final restoration, said method comprising the steps of:

attaching a foundation element via guide pins to at least two implants fixed in the bone of a patient, each foundation element having a base member having first and second ends defining an aperture for insertion of a guide pin therethrough for attaching said base member to an implant; and

at least one elongate member extending from the base member, having a first end at a point of attachment to the base member and a second free end that can be cut to optimally contact the base member of an adjacent foundation element;

connecting said free end of each of said elongate members of each foundation element to said base member of an adjacent foundation element thereby forming a framework;

taking an impression of said framework on the implants in the patient;

removing said impression and framework from said implants in the patient;

forming a rigid master mold from said impression and framework and containing said impression and framework;

removing said impression material from said framework on said master mold; and

attaching a biocompatible prosthesis onto said framework to form the final restoration.

2. The method of claim 1, wherein said elongate member has a generally trapezoidal cross-section.

3. The method of claim 1, wherein said implants are dental implants located in the jawbone of a patient.

4. The method of claim 1, further comprising the step of cutting said free end of said elongate member and orienting said foundation element such that said elongate member optimally contacts said base member of said adjacent foundation element prior to said step of connecting.

5. The method of claim 1, further comprising the step of extending said free end of said elongate member and orienting said foundation element such that said elongate member optimally contacts said base member of said adjacent foundation element prior to said connecting step.

6. The method of claim 1, further comprising the steps of cutting said elongate member from said base member at said first end of elongate member and reconnecting said first end of the elongate member to said base member such that the free end of said elongate member optimally contacts the adjacent base member.

7. The method of claim 1, further comprising the step of molding a strong and flexible prosthetic material onto said framework, thereby forming a biocompatible implant supported prosthesis, said prosthesis comprising said framework.

8. The method of claim 7 wherein said step of molding prosthetic material further comprises shaping replacement teeth out of said prosthetic material.

9. The method of claim 1, wherein said foundation elements are comprised of a material that is compatible with the material of the prosthesis supported on the framework.

10. The method of claim 1, wherein said foundation elements are comprised of a material that can be removed by evaporation or melting, and said method before the step of attaching the biocompatible prosthesis further comprises the steps of:

removing said framework from said master mold to cast a metallic framework; and

attaching said biocompatible prosthesis to said metallic framework.

16. The method of claim 1, wherein said foundation element is constructed of a biocompatible composite material.

17. The method of claim 1, wherein said foundation element is incorporated into a prosthesis mounted on said foundation element.

18. The method of claim 1, wherein said foundation element and prosthesis are formed of the same material.

19. The biocompatible implant-supported restoration formed by the method of claim 1.

11. A method for taking an implant impression in a patient using a framework made of a non-metallic material, comprising the steps of:

attaching foundation elements comprised of a non-metallic material to at least two implants fixed in a patient via guide pins, each foundation element having a base member having first and second ends defining an aperture for insertion of a guide pin therethrough for attaching said base member to an implant; and

at least one elongate member extending from the base member, having a first end at a point of attachment to the base member and a second free end that can be cut to optimally contact the base member of an adjacent foundation element;

connecting said free end of each of said elongate members of each foundation element to said base member of an adjacent foundation element thereby forming a framework;

taking an impression of said framework on the implants in the patient;

removing said impression and framework-from said implants in the patient;

forming a rigid master mold from said impression and framework and containing said impression and framework; and

removing said impression material from said framework on said master mold.

12. The method according to claim 11, wherein the elongate member has a generally trapezoidal cross-section.

13. The method according to claim 11, wherein the base member of said foundation element has a seat around the first end of the base member, configured and dimensioned to optimally support a prosthesis supported on said foundation element.

14. The method according to claim 11, wherein said base member and elongate member are made of a material that is compatible with the material of a prosthesis to be supported on said foundation elements.

15. The method of claim 11, wherein said guide pin has a tapered upper end and a threaded lower end for attachment to said implant.