Endosseous dental implant system

• US 5,435,723 A
• Filed: 08/18/1993
• Issued: 07/25/1995
• Est. Priority Date: 08/18/1993
• Status: Expired due to Term

• Current Assignee: Collaborative Enterprises Incorporated
• Original Assignee: Gary R O'Brien
• Inventors: O'Brien, Gary R.
• Primary Examiner(s): O'Connor, Cary E.
• Application Number:
  US08/108,869
• Time in Patent Office: 706 Days
• Field of Search: 433/173, 433/174, 433/175, 433/176, 606/65
• US Class Current: 433/174
• CPC Class Codes: A61C 8/0001 Impression means for implants, e.g. impression coping
• CPC Class Codes: A61C 8/0018 characterised by the shape
• CPC Class Codes: A61C 8/0022 Self-screwing A61C8/0028 takes precedence
• 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 8/005 Connecting devices for joining an upper structure with an implant member, e.g. spacers
• CPC Class Codes: A61C 8/0066 with positioning means A61C8/006 takes precedence
• CPC Class Codes: A61C 8/0069 tapered or conical connection
• CPC Class Codes: A61C 8/0086 with shock absorbing means
• CPC Class Codes: A61C 8/0087 Means for sterile storage or manipulation of dental implants
• CPC Class Codes: A61C 8/0089 Implanting tools or instruments
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30836 knurled
• CPC Class Codes: A61F 2002/3085 with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0067 conical

Abstract

An endosseous dental implant system comprises a root formed, mechanically retained base and an intimate, inter-locking threaded coronal attachment. The root formed base is comprised of a self-locking, externally threaded, tapered shell, and an anti-rotational internally threaded, countersunk plug which is permanently attached below the coronal surface of the shell, thus forming a single unit. Internally, the coronal portion of the shell has a downward tapered bevel for locking the anti-rotational coronal attachment to the base once attached via the internal threads of the permanently connected countersunk plug. Self-tapping threads are incorporated into the apex of the root formed base for easy insertion and immediate locking with the osteotomy. Downward from the coronal portion through the midsection of the root formed base is a specially designed stress distributing thread for uniform loading through the implant site. Finally, to simulate the physiological conditions, the implant system is manufactured from a material that closely replicates the natural dentition.

Claims

1. An endosseous dental implant for implanting into bone comprising:

a fixture having a elongate shape along a longitudinal axis;

an implant body;

a first series of cones in helical pattern provided over the first portion of said implant body, said first series of cones having a large surface area and an angle of incidence relative to a perpendicular to said longitudinal axis of said fixture to introduce tension, said cones being defined as tension cones, said first series of cones being located at a coronal portion of said implant, said tension providing a significant decrease in the vector force distributed into said bone; and

a second series of cones with a lower angle of incidence than said first series of cones and a reduced the volume of said cones compared to said first series of cones to transfer the majority of said stress to said second series of cones, said second series of cones to produce compression and being defined as compression cones,

whereby stress is evenly distributed and diverted over a larger volume thereby minimizing the initial incidence of trauma at the first point of contact.

2. The implant of claim 1 wherein said first and second series of cones are alternated to provide cones of tension and compression over a selected portion of said implant length to decrease the surface area and decrease the angle of incidence of said tension cones, and increase the surface area and increase the angle of incidence of the compression cones.

3. The implant of claim 1 wherein said implant has a decreasing diameter toward its bottom and comprises anchor threads gradually defined in its lower portion.

4. An endosseous dental implant for disposition in an implant for disposition in an implant site comprising:

a longitudinally extended shell having a longitudinally directed bore formed in one end thereof and a screw-type thread helically formed on an external surface thereof, said helical screw-type thread being defined by threads having at least two different thread angles for providing a uniform distribution of stress to the implant site; and

an internally threaded anti-rotational plug disposed within said bore of said shell and affixed to said shell for securing prosthetic attachments.

5. The implant of claim 4 further comprising an abutment for affixation to said plug wherein said plug is rotationally fixed to said abutment by splines

6. The implant of claim 4 further comprising an abutment for affixation to said plug wherein said plug is rotationally fixed to said abutment by a flat defined in said plug and abutment.

7. The implant of claim 4 wherein said helical screw-type thread includes:

a first series of cones disposed in a helical pattern provided over a first portion of said external surface of said shell, said first series of cones having a large surface area and an angle of incidence relative to a perpendicular to said longitudinal direction of said shell to introduce tension, said cones being defined as tension cones, said first series of cones being located at a coronal portion of said shell, said tension providing a significant decrease in a vector force distributed into said implant site; and

a second series of cones with a lower angle of incidence than said first series of cones and a reduced the volume of said second series of cones compared to said first series of cones to transfer a majority of said stress to said second series of cones, said second series of cones producing compression and being defined as compression cones.

8. The implant of claim 7 wherein said first and second series of cones are alternated to provide cones of tension and compression over a selected portion of said implant length to decrease the surface area and decrease the angle of incidence of said tension cones, and increase the surface area and increase the angle of incidence of the compression cones.

9. The implant of claim 8 wherein said implant has a decreasing diameter toward its bottom and comprises anchor threads gradually defined in its lower portion.

10. The implant of claim 4 wherein said plug is disposed within said bore of said shell with a main body portion of said plug disposed below an upper ridge of said shell.

11. The implant of claim 4 wherein said plug is affixed within said bore of said shell by welding.

12. The implant of claim 11 further comprising an abutment secured to a coronal end of said plug.

13. The implant of claim 12 wherein said plug is disposed within said bore of said shell with a main body portion of said plug disposed below an upper ridge of said shell to form an annular recess for receiving a portion of said abutment therein.

14. The implant of claim 4 wherein said plug has an external surface contour defined by a predetermined taper for forming a taperlock connection with said shell.

15. The implant of claim 4 wherein said shell further includes a self-tapping thread formed on said external surface thereof adjacent a distal end of said shell.