Dental implant with interlocking and centering threads

• US 8,337,205 B2
• Filed: 06/22/2009
• Issued: 12/25/2012
• Est. Priority Date: 06/22/2009
• Status: Active Grant

• Current Assignee: Rtg Scientific Inc.
• Original Assignee: Nspired Ideas
• Inventors: Reed, Gary
• Primary Examiner(s): Rodriguez, Cris L
• Assistant Examiner(s): ROSEN, ERIC J
• Application Number:
  US12/489,274
• Publication Number:
  US 20100323326A1
• Time in Patent Office: 1,282 Days
• Field of Search: 433/174, 411/16, 411/17, 411/39, 411/387, 411/394, 411/395
• US Class Current: 433/174
• 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 8/005 Connecting devices for joining an upper structure with an implant member, e.g. spacers
• CPC Class Codes: A61C 8/0068 with an additional screw
• CPC Class Codes: A61C 8/0074 with external threads
• CPC Class Codes: A61C 8/0075 Implant heads specially designed for receiving an upper structure if separable from the implant A61C8/005
• CPC Class Codes: A61C 8/0086 with shock absorbing means
• CPC Class Codes: Y10T 29/49567 Dental appliance making

Abstract

A dental implant device for insertion into a bore defined in bone for use with a prosthetic tooth or dental appliance includes an abutment with a plurality of male keys disposed about the distal end of the abutment capable of being affixed to the prosthetic tooth or dental appliance, an implantable anchor having a proximal and distal end, a plurality of female keyways defined into the proximal end of the anchor, the keyways capable of coupling to the male keys of the abutment and thereby preventing relative rotation of the abutment and anchor; an interlocking thread helically defined around a longitudinal axis of the anchor, the thread being adapted to couple to the bore defined in the bone and elements for coupling the abutment to the implant anchor.

Claims

1. A dental implantable device for insertion into bone for use with a prosthetic tooth, wherein the dental implantable device comprises:

an abutment with a plurality of male keys disposed symmetrically about the distal end of the abutment, the prosthetic tooth configured to be coupled to the abutment;

an implantable anchor with a proximal and distal end and having a plurality of female keyways disposed symmetrically about the proximate end of the implantable anchor capable of coupling to the male keys of the abutment and an interlocking thread helically defined around a longitudinal axis, the thread being adapted to thread into a bore in the bone and comprising;

a first superior contact surface having a first angle relative to the longitudinal axis greater than 90 degrees;

a second superior contact surface extending radially outward from the first contact surface and having a second acute angle relative to the longitudinal axis;

an inferior flank surface having a third angle relative to the longitudinal axis, wherein the first angle is larger than the second angle such that the first contact surface and the second contact surface form an approximate longitudinally cross-sectional V-shape; and

an inferior relief surface having a fourth angle relative to the longitudinal axis, wherein all of the angles relative to the longitudinal axis are unequal to each other and are arranged such that each thread continuously narrows in size as it becomes more radially distant from the longitudinal axis;

wherein the dental implantable device further comprises means for coupling the abutment to the implantable anchor; and

a self-tapping repository bore defined in a distal portion of the implantable anchor.

2. The dental implantable device of claim 1 wherein the repository bore defined in the distal portion of the implantable anchor is elliptical in shape.

3. The dental implantable device of claim 1 wherein the abutment and the implantable anchor each have a corresponding central hollow bore defined along their respective longitudinal axes.

4. The dental implantable device of claim 3 wherein the means for coupling the abutment to the implantable anchor comprises a threaded bolt arranged and configured to fit through the central hollow bore defined through the longitudinal axis of the abutment and to thread into the central hollow bore defined through the implantable anchor.

5. The dental implantable device of claim 1 wherein the means for coupling the abutment to the implantable anchor comprises means for maintaining the male keys disposed on the distal end of the abutment angularly fixed relative to the female keyways disposed on the proximal end of the implantable anchor.

6. An anchor screw for embedment into bone, comprising:

a screw body comprising a distal end for leading into the bone and a stem end opposite said distal end;

a thread helically circumscribing said screw body between said stem end and said distal end spaced from a central longitudinal axis of said screw body;

said thread having a chevron shape when viewed in section along a plane passing vertically through said longitudinal axis;

said chevron shape having a first side defining first and second contact surfaces and,

a second side defining first and second inferior surfaces; and

both said contact surfaces and said inferior surfaces defining said chevron shape;

wherein said first contact surface and said first inferior surface slope away from each other as said surfaces extend towards said longitudinal axis wherein said second contact surface and said second inferior surface slope away from each other as said surfaces extend towards said longitudinal axis, wherein said first and second contact surfaces are straight and meet at an angle when viewed in said section and wherein said first and second inferior surfaces are straight and meet at an angle when viewed in said section.

7. The screw of claim 6, wherein one of said first and second inferior surface defines an interlocking flank surface;

another of said first and second inferior surface defines an inferior relief surface; and

said interlocking flank surface is located closer to said longitudinal axis than said inferior relief surface.

8. The screw of claim 7, wherein said first contact surface is located closer to said longitudinal axis than said second contact surface.

9. The screw of claim 6, wherein said contact surfaces face said stem end.

10. The screw of claim 9, wherein said contact surfaces form a V-shape at their juncture.

11. The screw of claim 10, wherein said inferior surfaces form a V-shape at their juncture.

12. The screw of claim 11, wherein said inferior surfaces face said distal end.

13. The screw of claim 11, wherein said screw defines an implantable anchor having a plurality of female keyways defined into said stem end of said anchor, said keyways capable of coupling to male keys of an abutment which supports a prosthetic tooth and thereby preventing relative rotation of said abutment and said anchor.

14. The screw of claim 13, wherein the screw further comprises a repository bore defined in said distal end of said anchor.

15. The screw of claim 14 wherein said repository bore comprises a bore defined transversely into said anchor and having an elliptical shape.

16. The screw of claim 13 wherein said anchor has a central longitudinal bore defined at least partially through its respective longitudinal axis.

17. The screw of claim 16 wherein said central bore defined through said longitudinal axis of said anchor comprises a threaded blind bore with an inner female threaded surface.