Apparatus for forming dental prosthesis

• US 4,744,756 A
• Filed: 10/20/1986
• Issued: 05/17/1988
• Est. Priority Date: 10/20/1986
• Status: Expired due to Fees

• Current Assignee: Ross Systems Corporation
• Original Assignee: Ross Systems Corporation
• Inventors: Ross, Stanley E.
• Primary Examiner(s): Wilson, John J.
• Application Number:
  US06/920,796
• Time in Patent Office: 575 Days
• Field of Search: 433/173, 433/174, 433/175, 433/176, 433/220, 433/221, 433/193, 433/201.1, 433/210, 433/213, 433/214, 433/223, 433/195, 264/16, 264/19
• US Class Current: 433/173
• CPC Class Codes: A61C 8/00 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 Class Codes: A61C 8/0039 in the form of hollow cylinder with an open bottom

Abstract

A titanium pin is adapted to be formed with a dental prosthesis and mounted within a preinstalled dental anchor in a patient'"'"'s jaw. The pin is of one-piece construction and comprises a flange, an externally threaded stem, and a post. The stem is externally threaded and projects from a first side of the flange. The post is of non-circular cross-section and longitudinally irregular profile and projects from a second side of the flange. The stem is adapted to be threaded into an anchor, and the post is adapted to be properly shaped and then receive a cast body. An overlay is releasably mountable upon the cast body by means of a removable screw.

Claims

1. A combination of a dental anchor securable within a patient'"'"'s jaw and a dental prosthesis mountable within said anchor,

said anchor formed of a biocompatible material and configured as a circular cylindrical sleeve for installation in a circular cylindrical hole in a patient'"'"'s jaw bone, an internally threaded opening formed at a circular end of said anchor and arranged to open into the patient'"'"'s mouth,

said dental prosthesis comprising a pin and a dental body disposed on said pin, said pin being of one piece construction comprising:

a circular flange having first and second sides, and a straight cylindrical outer periphery, the diameter of said periphery being equal to that of said circular end of said anchor,

an externally threaded stem projecting integrally from said first side of said flange and threadedly receivable in said threaded hole of said anchor, said stem being of smaller width than said flange, and

a post projecting integrally from said second side of said flange and including a portion of non-circular cross-section and longitudinally irregular profile, said post being of less width than said flange, such that a portion of said second side of said flange disposed between an outer periphery of said flange forms a shelf,

said dental body being case in situ on said post and said shelf.

2. A combination according to claim 1, wherein said post is of rounded cross-section with a longitudinal flat on one side thereof for defining said non-circular cross-sectional shape.

3. A combination according to claim 1, wherein said post includes at least one generally circumferentially extending groove in its outer periphery for defining said longitudinally irregular profile.

4. A combination according to claim 3, wherein said post includes a plurality of said grooves, one of said grooves disposed closer to said flange than said other grooves and being deeper than said other grooves.

5. A combination according to claim 1, wherein said second side of said flange includes a pedestal, said post projecting from said pedestal.

6. A combination according to claim 1, wherein said pin is formed of titanium.

7. A combination according to claim 1, wherein said non-circular portion of said pin is of non-symmetrical cross-sectional shape.

8. A combination of a dental anchor securable within a patient'"'"'s jaw and a dental prosthesis adapted to be mounted within said anchor,

A. said anchor formed of a biocompatible material and configured for installation in a generally cylindrical hole in a patient'"'"'s jaw bone, an internally threaded opening formed at one end of said anchor and arranged to open into the patient'"'"'s mouth,

B. said dental prosthesis comprising:

(1) a pin of one-piece construction and comprising;

(i) a flange having first and second sides,

(ii) an externally threaded stem projecting integrally from said first side of said flange and threadedly receivable in said threaded hole of said anchor, said stem being of smaller width than said flange, and

(iii) a post projecting integrally from said second side of said flange and including a portion of non-circular cross-section and longitudinally irregular profile, said post being of less width than said flange,

(2) a cast body disposed on said second side of said flange with said post embedded therein, said body being fixed against rotation and longitudinal movement relative to said post due to said non-circular cross-sectional shape and said irregular longitudinal profile,

(3) a sleeve disposed within said body, said sleeve including an internally threaded hole which is exposed and opens outwardly of said body,

(4) an overlay removably disposed atop said body, and

(5) a screw extending through said overlay and threadedly disposed in said sleeve to secure said overlay to said body.

9. A combination according to claim 8, wherein said flange is circular and engages a circular end of said anchor, said flange being of equal diameter with said circular anchor end.

10. A combination according to claim 8, wherein said post is of rounded cross-section with a longitudinal flat on one side thereof for defining said non-circular crosssectional shape.

11. A combination according to claim 8, wherein said post includes at least one generally circumferentially extending groove in its outer periphery for defining said longitudinally irregular profile.

12. A combination according to claim 11, wherein said post includes a plurality of said grooves, one of said grooves disposed closer to said flange than said other grooves and being deeper than said other grooves.

13. A combination according to claim 8, wherein said second side of said flange includes a pedestal, said post projecting from said pedestal.

14. A combination according to claim 8, wherein said pin is formed of titanium. PG,28

15. A combination according to claim 8, wherein said non-circular portion of said pin is of non-symmetrical cross-sectional shape.

16. A pin adapted to carry a dental prosthesis and a preinstalled dental anchor in patient'"'"'s jaw, said pin being of one-piece construction and comprising:

a circular flange having first and second sides, and a straight cylindrical outer periphery,

an externally threaded stem projecting integrally from said first side and adapted to be threadedly received in the dental anchor, said stem being of smaller width than said flange, and

a post projecting integrally from said second side, said post having a longitudinal flat formed thereon which extends from a free end of said post and terminates short of said flange such that said post includes a first portion of circular cross-section disposed adjacent said flange and a second portion having a cross-section shaped as a circular segment bordered on one side by said flat, said second portion having circumferential grooves formed therein, said post being of less width than said flange such that a portion of said second side of said flange disposed between an outer periphery of said post and said outer periphery of said flange forms a shelf adapted to carry a dental prosthesis.

17. A pin according to claim 16, wherein said pin is formed of titanium.