DE102005017285B4 - Implant drill - Google Patents

Abstract

Implant bed drill with a working part (2) attached to a shank (1) on which a plurality of main cutting edges (3) are formed, wherein at least one helical cutting interruption groove (FIG. 3) interrupting the main cutting edges (3) and forming minor cutting edges (4) is formed on the working part (3). 5), wherein the secondary cutting edge (4) has a clearance angle (α) and an adjustment angle (æ), wherein the main cutting edges (4) are twisted at an angle γ of 1 ° to 7 °, and wherein the main cutting edges (3) are arranged with an unequal division.

Description

The The invention relates to an implant bed drill according to the features of the preamble of claim 1.

It it is understood that the invention also relates generally to surgical Drill refers, with which tailor-made and dimensionally accurate holes in the bone material be introduced.

Of the Prior art shows implant bed drills of different designs, in which the cutting edges are either straight and thus have no twist or are strongly twisted. The twist serves doing in the prior art chip removal, so that the chips from the drill bit are transported to the shaft out of the well, continue to apply an axial feed force, so that the implant bed drill similar to a Screw into the bone material incorporated. This is special in case of a right-hand spiral. This effect can be very disadvantageous be because the dentist or surgeon the depth of the implant bed bore can not or only inaccurately control. At a left twist results The disadvantage is that the chips be transported into the hole, allowing the control of the drilling process is difficult. In addition, jamming can be done by the chips.

The DE 100 22 047 C1 describes a burr which is provided at its periphery with non-twisted, paraxial grooves, which each form cutting edges, which in turn are interrupted by concentrically encircling annular grooves. From the DE 203 14 717 U1 is a rotating ceramic instrument with a shaft and a working part previously known, wherein at least a part of the working part is made of a ceramic material having a predetermined roughness.

Of the Invention is based on the object, an implant bed drill to create the type mentioned, which in a simple structure and easier, cheaper Manufacturability avoids the disadvantages of the prior art and has excellent cutting performance.

According to the invention Problem solved by the feature combination of the main claim, the under claims show further advantageous embodiments of the invention.

According to the invention is thus provided that main cutting interrupting and minor cutting forming cutting interruption grooves are provided.

By the cutting break grooves are achieved that the main cutting edges be interrupted, so that the active cutting length is less. This results in lower cutting forces. This leads to a better cutting behavior and easier handling of the implant bed drill according to the invention.

By the embodiment of the invention Main cutting and the minor cutting it is in a preferred embodiment the invention possible at the secondary cutting edges in each case a clearance angle and setting angle train. This results in an optimized cutting geometry. The main cutting edges intersect with their through the cutting break groove interrupted portions upon rotation of the implant bed drill in the circumferential direction, while the secondary cutting edges make a cut in the axial feed direction. By this combination of different cutting and different Cut geometries results overall in a very good cutting or cutting behavior. In addition, the implant bed drill is light manageable and needed, Compared to the prior art, a lower drive power and feed force.

In a particularly favorable Further development of the invention provides that an edge of the cutting interruption groove just trained. It is thus possible to round off the groove bottom or the axially forward flank also to round. hereby the notch effect is reduced, so that the breakage sensitivity sinks.

Especially Cheap is it that the main cutting edges are twisted at a slight twist angle are, for example, at an angle between 1 ° and 7 °. The slight twist angle leads to a low feed force in the axial direction, without this the drilling process to disturb or negatively.

According to the invention can Implant bed drills are formed with different right twist. This can be dependent from the particular geometry, the diameter of the implant bed drill as well as the respective conditions of use.

Around to avoid rattling and to ensure high roundness of the bore, is provided, the main cutting edges with an uneven pitch to arrange. In the description of the embodiments is based on this Aspect still be discussed in detail.

Of the Implant bur drills according to the invention can with or without internal cooling be educated. With a cooling is preferably a centric coolant channel intended.

Of the Implant bur drills according to the invention can be made of different materials, the Shaft and the working part either made of the same material or be made of different materials. As materials For example, stainless steel, carbide or ceramics are used in question.

Regarding the geometry of the implant bed drill is this in the context of Invention to the different design variants of the implants and the resulting holes customizable. The working part is preferably conical, but it is also graded or cylindrical shapes possible. The same applies to the Number of cutting, it can For example, be provided four, six, eight or ten cutting.

in the The invention will be described below on the basis of exemplary embodiments described with the drawing. Showing:

1 a side view of a first embodiment of the implant bed drill according to the invention,

2 an enlarged view of the working part of the in 1 shown implant bed drill,

3 an enlargement of the front end region of the working part,

4 an enlarged view of the front end portion of the working part,

5 a sectional view in radial plane,

6 an enlarged detail of the sectional view of 5 .

7 a radial sectional view of an embodiment with four main cutting edges, and

8th a radial section view, analog 7 of an embodiment with six main cutting edges.

The implant bed drill according to the invention comprises a shaft in the usual way 1 , which is dimensioned and configured so that the implant bed drill can be used in conventional drive units or angle pieces. On the shaft 1 is in one piece or by means of a joining process, a working part 2 arranged. This may be formed substantially cylindrical or conical. The working part 2 has several main cutting edges 3 on, which, how out 2 is apparent, are twisted at an angle γ. The helix angle γ is between 1 ° and 7 °.

How to continue 2 is apparent, is the working part 2 with cutting interruption grooves 5 educated. The cutting interruption grooves may be spiral. The cutting interruption grooves 5 have a substantially trapezoidal or rectangular cross section and form, as will be explained below, minor cutting 4 , which are characterized by the interruption of the main cutting edges 3 result.

The 1 and 2 show that the cutting break grooves 5 not over the entire length of the working part 2 must be trained. Rather, it is also possible at a rear area 6 of the working part 2 no cutting interruption grooves 5 provide and form this example, with a larger diameter. The leaking area of the main cutting edges 3 also cuts there. This makes it possible to provide a contouring of the implant bore.

The 3 to 6 show an enlarged view of the geometries and angles of the main cutting edges 3 and the minor cutting edge 4 , From the 3 and 4 is particularly clear again that the main cutting edge 3 each through the cutting break grooves 5 is interrupted. Without the interruption would thus be a straight or arcuate main cutting edge 3 result.

The Main cutting edge or the individual subsections of the main cutting edge to lead to a cutting operation in the circumferential direction when the implant bed drill is in rotation.

The through the cutting interruption grooves 5 trained minor cutting 4 lead to a cutting process in the axial direction or feed direction. In 3 is for the minor cutting 4 the setting angle æ shown, which results according to the usual definition of the setting angle as an angle between the feed direction and main cutting edge.

The 4 shows a clearance angle α for the minor cutting edge, wherein the edge of the minor cutting edge is arranged in this representation perpendicular to the image plane. It is thus the clearance angle α in the axial direction.

The 5 and 6 show sections in a radial plane, which are arranged perpendicular to the longitudinal plane of the implant bed drill. The rotation or direction is in the selected representation in each case counterclockwise, so that the selected viewing direction of the sectional views of 5 to 8th each from the distal end from the direction of the shaft 1 is. This results in a look at the individual secondary cutting edges, which result from the conical design of the working part. Of the hatched area corresponds to the cut area of the working part 2 , Consequently, according to the figure, the 5 and 6 the main cutting edge 3 perpendicular to the image plane, so that their clearance angle αr shows in the radial section plane. The angle γ _s describes the size and design of the chip space.

The 7 and 8th show exemplary embodiments of the implant bed drill according to the invention, in which an unequal pitch of the cutting (unequal tooth pitch) is provided. In the embodiment of the 7 the respective pitch angle is increased or reduced by 1 °, based on an equal pitch of 90 °. In the embodiment of the 8th each individual segments are enlarged or reduced by 1 °.

It can the following divisions result:

4-edged instrument

For a four-edged instrument, this minimally leads to the following variance:
89 °, 91 °, 89 °, 91 ° ( 4 )
And maximum: 85 °, 95 °, 85 °, 95 °

6-edged instrument

For a six-edged instrument, this minimally leads to the following variance:
59 °, 60 °, 61 °, 59 °, 60 °, 61 ° ( 5 )
And maximum: 55 °, 60 °, 65 °, 55 °, 60 °, 65 °

8-edged instrument

at an instrument with eight edges results in the following variance:

version 1

• Minimum: 44 °, 45 °, 46 °, 45 °, 44 °, 45 °, 46 °, 45 °
• And maximum: 40 °, 45 °, 50 °, 45 °, 40 °, 45 °, 50 °, 45 °

Variant 2

• Minimum: 44 °, 46 °, 44 °, 46 °, 44 °, 46 °, 44 °, 46 °
• And maximum: 45 °, 50 °, 45 °, 50 °, 45 °, 50 °, 45 °, 50 °

10-edged instrument

at This results in the following variance for a ten-edged instrument:

version 1

• Minimum: 34 °, 35 °, 36 °, 37 °, 38 °, 34 °, 35 °, 36 °, 37 °, 38 °
• And maximum: 26 °, 31 °, 36 °, 41 °, 46 °, 26 °, 31 °, 36 °, 41 °, 46 °

Variant 2

• Minimum: 35 °, 37 °, 35 °, 37 °, 35 °, 37 °, 35 °, 37 °, 35 °, 37 °
• And maximum: 31 °, 41 °, 31 °, 41 °, 31 °, 41 °, 31 °, 41 °, 31 °, 41 °

Of the implant burial drill according to the invention thus both for the training of a complete Bore as well for the expansion of an existing hole can be used. It deals in any case, a drill with a defined cutting geometry, but not a router.

1

shaft

2

working part

3

main cutting edge

4

Besides cutting

5

Schneidenunterbrechungsnuten (Spiral groove)

6

Area of the working part

α

clearance angle Spiral angle adjustment angle

γ _s

Chip space angle

Claims (7)

Implant bed drills with one on a shaft ( 1 ) fixed working part ( 2 ), on which several main cutting edges ( 3 ) are formed, wherein at the working part ( 3 ) at least one of the main cutting edges ( 3 ) interrupting and minor cutting ( 4 ) forming spirally extending cutting interruption groove ( 5 ), wherein the secondary cutting edge ( 4 ) has a clearance angle (α) and an adjustment angle (æ), wherein the main cutting edges ( 4 ) are twisted at an angle γ of 1 ° to 7 °, and wherein the main cutting edges ( 3 ) are arranged with an unequal pitch. Implant bed drill according to claim 1, characterized in that a flank of the cutting interruption groove ( 5 ) is formed. Implant bed drill according to claim 1 or 2, characterized in that the main cutting edges ( 3 ) are provided with a right-hand twist. Implant bed drill according to one of claims 1 to 3, characterized in that at least one coolant channel provided for internal cooling is. Implant bed drill according to one of claims 1 to 4, characterized in that at least the working part ( 2 ) is made of steel. Implant bed drill according to one of claims 1 to 4, characterized in that at least the working part ( 2 ) is made of hard metal. Implant bed drill according to one of claims 1 to 4, characterized in that at least the working part ( 2 ) is made of ceramic.