Components for threading of bone

Patent metadata

Field	Value
Publication number	US-9259299-B2
Application number	US-201013394532-A
Country	US
Kind code	B2
Filing date	Sep 6, 2010
Priority date	Sep 7, 2009
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

In certain embodiments, a combination of a thread forming tool and an implant is disclosed. The thread forming tool can have a thread forming section with a helical thread having at least one cutting surface for cutting a thread in bone. The implant can include a bone apposition surface having at least one helical thread for position at least partially in the thread of the bone. A longitudinal cross-sectional shape of at least a portion of the helical thread of the thread forming section in certain embodiments, substantially corresponds to a longitudinal cross-sectional shape of at least a portion of the helical thread of the implant.

First claim

What is claimed is:

1. A combination of a thread forming tool and an implant for placing the implant in a jawbone or for oral or cranio-maxillofacial implant placement, the combination comprising:
the thread forming tool comprising, at an apical end of the tool, a thread forming section with a helical thread having at least one cutting surface for cutting a thread in bone, the helical thread of the thread forming section comprising a plurality of crests and roots;
the implant comprising a bone apposition surface having at least one helical thread for position at least partially in the thread of the bone, the helical thread of the bone apposition surface comprising a plurality of crests and roots, wherein a longitudinal cross-sectional shape of at least a portion of the helical thread of the thread forming section substantially corresponds to a longitudinal cross-sectional shape of at least a portion of the helical thread of the implant;
a drill; and
a guide sleeve for a surgical template,
wherein a dimension of said cross-sectional shape of the helical thread of the thread forming section is smaller than a corresponding dimension of said cross-sectional shape of the helical thread of the implant,
wherein the crests or the roots of the thread forming section are tapering outwardly relative to the central longitudinal axis of the tool from an apical end of the thread forming section towards a coronal end for substantially all of the thread forming section, and the crests or the roots of the bone apposition surface of the implant are tapering outwardly relative to the central longitudinal axis of the implant from an apical end of the implant towards a coronal end for substantially all of the bone apposition surface of the implant,
wherein a maximum diameter of an apical portion at one of the plurality of crests of the bone apposition surface is larger than a maximum diameter of an apical portion at one of the plurality of crests of the thread forming section of the thread forming tool, and smaller than a coronal portion of the thread forming section of the thread forming tool,
wherein the guide sleeve has a guide surface on an inner surface of the guide sleeve for guiding the thread forming tool,
wherein the drill has at least one cutting edge on an apical section and a coronal section,
wherein the thread forming tool has a guide section for guidance by the guide surface of the guide sleeve, and
wherein the maximum diameter of the apical portion of the thread forming section is smaller than or equal to a maximum diameter of the cutting edge of the drill.

2. The combination according to claim 1 , wherein said dimension of the thread forming section is the radius from the central longitudinal axis of the thread forming tool to an external surface of a crest of its thread, and said dimension of the thread of the implant is the radius from the central longitudinal axis of the implant to an external surface of a crest of its thread.

3. The combination according to claim 1 , wherein said dimension of the thread forming section is the radius from the central longitudinal axis of the thread forming tool to an external surface of a root of its thread, and said dimension of the thread of the implant is the radius from the central longitudinal axis of the implant to an external surface of a root of its thread.

4. The combination according to claim 1 , wherein a pitch of the helical thread of the thread forming section is substantially equal to a pitch of the helical thread of the implant.

5. The combination according to claim 1 , wherein a maximum diameter of at least the apical portion of the bone apposition surface is smaller than or equal to a maximum diameter of the thread forming section of the thread forming tool.

6. The combination according to claim 1 , wherein a maximum diameter of a coronal portion of the bone apposition surface is larger than a maximum diameter of the coronal portion of the thread forming section of the thread forming tool.

7. The combination according to claim 1 , wherein a position of the maximum diameter of the apical portion of the thread forming section is located offset from the apical end of the thread forming section and at a first distance from an apical end of the guide section, wherein the combination is configured to have said first distance being substantially equal to a second distance from said position to a coronal end of the guide surface when the thread forming tool is partially inserted into the guide sleeve such that the guide sleeve provides guidance before the thread forming section engages the bone.

8. The combination according to claim 7 , wherein the offset is at least about 1 mm.

9. The combination according to claim 1 , wherein the apical end of the thread forming section is larger than a maximum diameter of the apical section of the drill, the apical section of the drill smaller than a maximum diameter of the coronal section of the drill.

10. The combination according to claim 8 , wherein the offset is at least about 2 mm.

11. The combination according to claim 10 , wherein the offset is in a range of about 2 mm to about 3 mm.

12. The combination according to claim 1 , wherein the level of taper as indicated by straight lines interconnecting a number of the crests or a number of the roots of the bone apposition surface relative to the central longitudinal axis of the implant at the coronal end of the implant compared to the apical end of the implant is less for both the crests and the roots of the bone apposition surface.

13. A method of placing an implant in a threaded recess in bone, the method comprising:
providing the combination according to claim 1 ;
drilling a recess in the bone with the drill;
forming with the thread forming tool, a thread in the recess having a shape which at least partially corresponds to a shape of the helical thread of the implant; and
inserting said implant in said threaded recess.

Assignees

• Jörneus Lars
• Petersson Henrik
• Nobel Biocare Services Ag

Inventors

• Jörneus Lars
• Petersson Henrik

Classifications

• A61C8/0089 Primary

  Implanting tools or instruments · CPC title

• A61B17/1655

  for tapping · CPC title

• A61C1/084

  of implanting tools · CPC title

• A61C8/0022

  Self-screwing (A61C8/0028 takes precedence) · CPC title

• A61C1/08

  Machine parts specially adapted for dentistry · CPC title