Endosseous implant drill
AssigneeNobel Biocare AB
InventorsAjay Kumar, Steven M. Hurson
Life of this patent
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Abstract
The invention provides a dental drill comprising a plurality of blades each distally terminating in an end cutting edge having a positive rake angle. Advantageously, this allows for efficient, accurate and safe formation of an endosseous implant-receiving osteotomy in a patient's jawbone. Desirably, any patient trauma or discomfort during the procedure is substantially eliminated or reduced and a precision-sized osteotomy for receiving an implant of a predetermined size is created.
Claims55
A drill bit for preparing surgical sites for placement of endosseous dental implants, comprising:
- a mounting shank having a chuck at a proximal end sized and configured to interface with a rotation providing hand-piece;
- a distal cutting head comprising a plurality of end blades each having an end cutting edge with a positive rake angle converging radially from substantially an outer-most diameter of said cutting head to substantially a distal-most point of said cutting head;
- and
- a plurality of side blades intermediate said mounting shank and said distal cutting head, each of said side blades being substantially straight and extending radially to a distance about the same as said outer-most diameter, each of said side blades having a side edge which terminates proximate to said outer-most diameter, each of said side edges being substantially rounded so as to substantially eliminate or inhibit side cutting.
A dental tool bit for forming an endosseous implant-receiving osteotomy in bone material, comprising:
- a shank having a rotary longitudinal axis, said shank comprising:
- a mounting portion adapted to interface with a dental hand-piece;
- and
- a working portion having a distal terminus and an outer-most perimeter, said working portion comprising a plurality of blades extending generally parallel to said longitudinal axis, each of said blades distally terminating in an end cutting blade, each of said end cutting blades having a leading surface with a leading end cutting edge, a trailing surface with a trailing end edge and a relief surface between said leading end cutting edge and said trailing end edge, each of said leading surfaces being ground to form an extending facet around said distal terminus, said facets being substantially symmetrically arranged around said distal terminus, said leading surfaces, said relief surfaces and said facets converging to substantially a point at said distal terminus, at least one of said end cutting blades having a positive rake angle, at least one of said end cutting blades having said positive rake angle along substantially its entire span extending radially from substantially said distal terminus of said working portion to substantially said outer-most perimeter of said working portion.
A dental drilling system for preparing an osteotomy, comprising:
- a tool bit having a mounting shank, a cutting tip, a collar portion therebetween and a longitudinal irrigation passage, said cutting tip comprising a plurality of blades each distally terminating in an end cutting edge, each end cutting edge having a positive rake angle spanning substantially its entire length, at least one of said end cutting edges diverging from substantially a distal terminus of said cutting tip to substantially an outer-most periphery of said cutting tip, said collar portion comprising a transverse through hole in fluid communication with said irrigation passage and extending in a direction generally perpendicular to said irrigation passage;
- and
- a dental hand-piece holding said tool bit and adapted to provide rotational motion to said tool bit.
A dental tool bit for forming an implant-receiving osteotomy in a jawbone, comprising:
- a shank having a substantially central longitudinal axis and a direction of rotation, said shank comprising:
- a mounting portion having a chuck at a proximal end adapted to interface with a rotary dental hand-piece;
- a working portion having a distal-most point and an outer-most perimeter, said working portion comprising a plurality of blades extending substantially parallel to said longitudinal axis, each of said blades having a leading surface distally terminating in an end cutting edge, each end cutting edge extending radially from substantially said distal-most point of said working portion to substantially said outer-most perimeter of said working portion, at least one of said leading surfaces being angled relative to said longitudinal axis such that it is tilted away from said direction of rotation;
- and
- a low friction coating on said working portion, said coating comprising amorphous diamond.
A method of forming an osteotomy in bone material for receiving a dental implant by using a drill bit having a cutting tip comprising a plurality of end blades each having an end cutting edge with a positive rake angle converging radially from substantially an outer-most diameter of said cutting tip to substantially a distal-most point of said cutting tip, said method comprising the steps of:
- positioning said drill bit at a selected osteotomy site;
- engaging said drill bit with said bone material;
- providing rotational motion to said drill bit to cut said bone material due to rotational interaction between said end cutting edges having said positive rake angle and said bone material to form said osteotomy;
- and
- limiting side cutting as said drill bit penetrates into said bone material by providing a plurality of side blades above said cutting tip, each of said side blades being substantially straight and extending radially to a distance about the same as said outer-most diameter, each of said side blades having a side edge which terminates proximate to said outer-most diameter, each of said side edges being substantially rounded so as to substantially eliminate or inhibit side cutting due to engagement of said side edges with said bone material.
Dependencies are inferred from the claim text.