Dentistry tool

Patent metadata

Field	Value
Publication number	US-11045287-B2
Application number	US-201716073281-A
Country	US
Kind code	B2
Filing date	Jan 30, 2017
Priority date	Jan 29, 2016
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A drill bit and method for normalizing bone is provided. The drill bit has a non-round drill bit core that is adapted to cut hard bone and to not cut soft bone. The drill bit has a cutting edge which may be positioned within a compression zone of the non-round drill bit core. The rotational speed of the drill bit and the profile of the drill bit core are tuned so that hard bone recovers into a cutting zone defined by the cutting edge while soft bone remains outside of the cutting zone. The insertion torque of the drill bit can be measured to determine when the normalization is adequate.

First claim

What is claimed is:

1. A drill bit comprising:
an apical end, a coronal end, and a longitudinal axis extending between the apical end and the coronal end;
a drill bit core circumferentially surrounding the longitudinal axis and having at least a portion with a non-round profile when viewed in a plane perpendicular to the longitudinal axis, the portion with a non-round profile forming a plurality of lobes, each of the plurality of lobes forming at least one first compression zone, the drill bit core having a maximum radii at each of the plurality of lobes, wherein the drill bit core comprises a no-cutting zone at the maximum radii at each of the plurality of lobes;
a plurality of flutes, each of the plurality of flutes corresponding with one of the plurality of lobes, each of the plurality of flutes positioned on a circumference of the drill bit core and at a circumferential distance away from the maximum radii of a corresponding one of the plurality of lobes, wherein each of the plurality of flutes comprises a first cutting edge formed on the drill bit core and positioned inwardly from the maximum radii of the corresponding one of the plurality of lobes of the drill bit core;
a cutting zone extending inwardly from at least one of the cutting edges, wherein a position of the at least one cutting edge allows a hard bone to be positioned within the cutting zone and allows a soft bone to be positioned within the no-cutting zone, in use; and
a guide thread which extends radially outward from the drill bit core.

2. The drill bit of claim 1 wherein each cutting edge of the plurality of flutes is disposed within the at least one compression zone of the corresponding one of the plurality of lobes.

3. The drill bit of claim 1 wherein the drill bit core tapers toward the apical end.

4. The drill bit of claim 1 wherein the maximum radii of at least one of the plurality of lobes circumferentially shifts about the longitudinal axis as the drill bit core extends toward the apical end.

5. The drill bit of claim 1 wherein the non-round profile forming the plurality of lobes is tri-lobed.

6. The drill bit of claim 1 wherein each of the plurality of flutes wraps circumferentially around the longitudinal axis as each of the plurality of flutes extends between the apical end and the coronal end of the drill bit.

7. The drill bit of claim 1 wherein the first cutting edge is a first radial distance from the longitudinal axis and the maximum radii of the drill bit core is a second radial distance from the longitudinal axis, the no-cutting zone defined as a difference between the second radial distance and the first radial distance.

8. The drill bit of claim 7 , wherein the no-cutting zone remains constant between the apical and coronal ends of the drill bit.

9. A kit of parts comprising a drill bit of claim 1 and an implant.

10. The kit of parts of claim 9 wherein the implant comprises a thread, the guide thread of the drill bit differs from the thread of the implant in pitch and/or height and/or width.

11. A drill bit comprising:
an apical end, a coronal end, and a longitudinal axis extending between the apical end and the coronal end;
a drill bit core circumferentially surrounding the longitudinal axis and having at least a portion with a non-round profile when viewed in a plane perpendicular to the longitudinal axis, the portion with a non-round profile forming at least one compression zone;
a cutting edge disposed within the at least one compression zone of the drill bit core,
wherein the cutting edge is a first radial distance from the longitudinal axis and a maximum outer dimension of the drill bit core is a second radial distance from the longitudinal axis, the second radial distance being larger than the first radial distance, wherein the drill bit core comprises a no-cutting zone at the maximum outer dimension, and wherein the no-cutting zone at the maximum outer dimension spirally wraps circumferentially around the longitudinal axis as the no-cutting zone at the maximum outer dimension extends between the apical portion and the coronal portion of the drill bit such that the maximum outer dimension shifts circumferentially along the length of the drill bit;
a cutting zone extending inwardly from the cutting edge, wherein a position of the cutting edge allows a hard bone to be positioned within the cutting zone and allows a soft bone to be positioned within the no-cutting zone, in use; and
a guide thread which extends radially outward from the drill bit core.

12. The drill bit of claim 11 , wherein the drill bit core further comprises a cutting flute, wherein the cutting flute comprises the cutting edge.

13. The drill bit of claim 12 wherein the cutting flute wraps circumferentially around the longitudinal axis as the cutting flute extends between the apical portion and the coronal portion of the drill bit.

14. A kit of parts comprising a drill bit of claim 11 and a dental implant.

15. The kit of parts of claim 14 wherein the dental implant comprises a thread, the guide thread of the drill bit differs from the thread of the dental implant in pitch and/or height and/or width.

16. The drill bit of claim 11 wherein the non-round profile forming the plurality of lobes is tri-lobed.

Assignees

• Nobel Biocare Services Ag

Inventors

• Burke Edmund
• Sollberger David
• Nussbaumer Silvio
• Holst Stefan
• Geiselhoringer Hans
• Quarry Antony
• Weitzel Jorg

Classifications

• A61C8/0089 Primary

  Implanting tools or instruments · CPC title

• A61C3/02 Primary

  Tooth drilling or cutting instruments; Instruments acting like a sandblast machine · CPC title

• A61B17/1673 Primary

  for the jaw · CPC title

• A61B17/1655

  for tapping · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title