KR101122600B1 - Drill for dental surgery - Google Patents

Abstract

PURPOSE: A dental clinic drill is provided to prevent damage to a maxillary sinus film by rapidly and safely lifting the maxillary sinus film. CONSTITUTION: A dental clinic drill comprises a body(10), a connection part(20), and a cutting part. The body is connected to a drive unit including a surgical operation engine. The cutting part has a cutting blade for drilling. The cutting blade comprises a plurality of main cutting blades and auxiliary blades arranged between main cutting blades.

Description

Dental Drills {DRILL FOR DENTAL SURGERY}

The present invention relates to a dental drill for use in the oral cavity of a patient, and more particularly, to a dental drill that can be quickly and safely perforated in the maxillary sinus without damaging the mucous membrane inside the maxillary sinus during the maxillary sinus procedure will be.

In the skull of the human body, there are empty spaces such as maxillary sinus, frontal sinus and sphenoid sinus, which play a role of reducing the weight of the skull and resonating sound, and a mucosa exists between the empty space and the skull. The presence of such mucosa acts as a cause of difficulty in the procedure when approaching the maxillary sinus and placing the implant.

Problems during the procedure occur when a hole is formed to implant a bone into an empty space of the maxillary sinus. That is, the maxillary sinus mucosa can be easily torn when the drill's blade touches the mucosa or the surgeon exerts excessive force during the rotation of the drill during the drilling of the maxillary sinus. Because tearing of the mucosa can cause problems such as infection of the maxillary sinus, the operator should always be careful to avoid tearing as much as possible.

In the process of drilling by rotating the drill in the oral cavity, the operator most judges the perforation of the maxillary sinus by the operator's fingertips. Check the depth of perforation by checking the thickness of the maxilla by X-ray or CT, but the bone in the maxillary sinus exists in various forms such as flat, concave, and septum. Because of the shape, the procedure is always under pressure that the mucous membrane may be perforated.

In order to reduce the burden on the operator, conventionally, the end of the drill is blunted so that the mucosa is not torn even when the rotating blade touches the mucosa, or the drill is operated in low speed or hand mode with low cutting force, A method has been proposed in which diamond grit of particles is attached to a tool to crush bone.

However, such conventional drills have a problem that the drilling operation takes a long time because the blade is blunted or the drilling operation is performed at a low speed to avoid tearing of the mucosa.

And the ejection and cutting of the cut bone chip is not made smoothly, and the bone part being cut is partially heated by friction heat with the drill, or the operator exerts excessive force. The problem is that there is a risk of perforating the mucous membranes.

The present invention to solve the above problems, in the side approach that is the implantation method of maxillary sinus implant, while the drill has the inherent function of drilling or expanding the cortical bone and sponge bone like a normal drill, while the drill is in direct contact with the maxillary sinus membrane By providing a drill that prevents damage to the maxillary sinus membrane by elevating the maxillary sinus membrane quickly and safely, it is intended to increase the clinical success rate after the procedure while providing safety and convenience to the implant procedure.

According to an aspect of the present invention for achieving the above object, a dental including a connecting portion formed on the top of the body to be connected to the drive device, and a cutting portion formed on the bottom of the body and having a cutting edge for drilling As a drill, the cutting portion includes a plurality of cutting edges arranged in a radially spread shape, the cutting edges having a plurality of main cutting edges spaced apart from each other at angular intervals and an auxiliary portion disposed between the main cutting edges. Provided is a dental drill comprising a cutting edge.

The main cutting edge is protruded from the surface of the cutting portion so that cutting can be started first when bone cutting starts, and the auxiliary cutting edge preferably participates in further cutting after the cutting of the main cutting edge is started. .

A plurality of auxiliary cutting edges are formed so that the number of cutting edges participating in the cutting increases as the cutting proceeds and the cutting portion is inserted into the bone, and the auxiliary cutting edges of at least some of the plurality of auxiliary cutting edges are different from each other. It is preferred to have a length.

The cutting edge may include a main cutting edge extending from the base of the cutting portion to a center point, a first auxiliary cutting edge extending to the center point of the cutting portion with the same length as the main cutting edge, and a length longer than the first auxiliary cutting edge. It is preferable to include the second and third auxiliary cutting edge that is short and does not extend to the center point of the cutting portion.

The third auxiliary cutting edge is preferably shorter in length than the first auxiliary cutting edge and longer in length than the second auxiliary cutting edge.

A plurality of auxiliary cutting edges are formed, and it is preferable that at least some of the auxiliary cutting edges of the plurality of auxiliary cutting edges intersect with other cutting edges adjacent in the rotational direction of the drill.

It is preferable that grinding processing is performed with respect to the cutting edge so that the edge portion of the cutting edge becomes sharp.

It is preferable that a diameter enlargement portion having a gradually increasing diameter is formed between the relatively small diameter body and the relatively large diameter cutting portion.

Preferably, the cutting portion is formed with one or more protrusions protruding from the surface of the cutting portion.

The protrusion includes a center protrusion formed at the center of the cutting portion where the main cutting edges intersect, and a peripheral protrusion formed around the center protrusion, wherein the diameter of the circle passing through the peripheral protrusion is centered on the center protrusion. It is preferable to have a value of 0.5 to 0.001 with respect to the diameter of the said cutting part.

The amount of protrusion of the protrusions preferably has a value of 20% to 0.01% of the overall height of the cutting portion.

Preferably, between the cutting portion and the body, a stepped portion protruding outward and a stop portion protruding further outward from the base end of the stepped portion are formed.

It is preferable to further include a stopper that can be fixed to the stepped portion.

The stopper preferably includes a coupling part having an inner circumferential diameter the same as or larger than an outer circumferential diameter of the stepped portion, and a fitting preventing portion having an inner circumferential diameter smaller than the outer circumferential diameter of the stepped portion.

Preferably, the coupling part may be divided into a plurality of pieces by an incision extending upward and downward.

In order to ensure the engagement state of the engaging portion to the stepped portion, it is preferable that a protrusion is formed at the base of the stepped portion and a concave portion that can be fitted to the protrusion is formed at the inner circumferential end of the engaging portion.

According to another aspect of the present invention, a dental drill comprising a connecting portion formed on the upper end of the body to be connected to the drive device, and a cutting portion formed on the lower end of the body and having a cutting edge for drilling, wherein the cutting portion And a plurality of cutting edges arranged in a radially spread shape, wherein the cutting edge includes a main cutting edge participating in cutting from a time point at which cutting by the cutting portion is started, and after cutting by the main cutting edge is started. In addition to the auxiliary cutting edge to participate in the cutting, there is provided a dental drill, characterized in that the chip pocket portion is formed between the cutting blade is filled with the chip.

It is preferable to further include a stopper fitted to partially surround the cutting portion.

According to another aspect of the present invention, a dental drill comprising a connecting portion formed on the upper end of the body to be connected to the drive device, and a cutting portion formed on the lower end of the body and having a cutting edge for drilling, wherein the cutting portion Comprising a plurality of cutting edges arranged in a radially spread shape, the outer shape of the cutting portion is a hemispherical shape, a mixture of hemispherical end curve section and a straight section, rounded corner rounded (square round) Provided is a dental drill having any one of a shape, a square shape, and a tapered shape.

According to the present invention as described above, in the lateral approach of the maxillary sinus implant placement method, while having the drill's inherent function of drilling or expanding cortical bones and sponges like a normal drill, even if the drill is in direct contact with the maxillary sinus membrane A dental drill may be provided that can elevate the membrane quickly and safely to prevent damage to the maxillary sinus membrane.

According to the dental drill of the present invention, since the drill tip has a dome shape, it is not necessary to approach in a direction perpendicular to the bone surface at the time of approaching the drill to the bone surface, so that the procedure is easy in a narrow space.

According to the dental drill of the present invention, the drill tip has a dome shape and at the same time a bone chip can be easily filled between the blade and the blade, so that the maxillary sinus membrane is safe even when the drill blade is in direct contact with the maxillary sinus membrane. You will be able to elevate.

As described above, according to the present invention, the maxillary sinus membrane can be safely approached and lifted at the time of maxillary sinus procedure.

1 is a front view of a dental drill according to the present invention,
2 is a plan view of a cutting portion of a dental drill according to the present invention;
3 is a perspective view of a cutting portion of a dental drill according to the present invention;
Figure 4 is a front view of the cutting portion of the dental drill according to the present invention,
5 is an enlarged view of a part of a cutting part of a dental drill according to the present invention;
6 is a front view of a dental drill according to the present invention with a stopper mounted thereon;
7 is a cross-sectional view of the stopper of the dental drill according to the present invention,
8 is a diagram illustrating various forms of the dental drill of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the dental drill which concerns on preferred embodiment of this invention is demonstrated in detail with reference to drawings.

As shown in Figures 1 to 6, the dental drill according to a preferred embodiment of the invention, one end of the substantially cylindrical body 10 (ie, to be connected to a drive device such as a hand driver or a dental treatment engine) 1, a cutting portion 30 formed at the other end of the body 10 (i.e., the lower end viewed in FIG. 1) and a cutting edge 30 for drilling, formed at the connecting portion 20 formed at the upper side as seen in FIG. It includes.

The cutting part 30 has a roughly dome shape and can cut even when the drill approaches the bone surface to be cut without necessarily approaching the bone surface in a direction perpendicular to the bone surface, thereby performing the procedure in a narrow space in the oral cavity. Can be easily performed. As used herein, the term “dome shape” means not only a hemispherical shape but also a shape or a semi-elliptic shape having a mixed shape of a curved section and a straight section, such as a square round shape having rounded corners. Even the concept includes everything.

A plurality of cutting edges are formed in the cutting part 30, and as shown in FIG. 2, the plurality of cutting edges have a shape radially spread out from the center point C.

The cutting edges may include a plurality of main cutting edges spaced apart from each other at angular intervals, and a plurality of auxiliary cutting edges disposed between these main cutting edges. The main cutting edge is formed so as to protrude highest from the hemispherical surface of the cutting portion 30, the cutting edge is the first cutting edge starts when cutting the bone by the cutting portion 30 of the drill, It is a blade that is mainly done during bone cutting. The auxiliary cutting edge is a blade that additionally participates in cutting after the cutting of the primary cutting edge, and is a blade that assists in bone cutting during the drilling operation.

The main cutting edges may be formed to be spaced apart from one another at regular angular intervals or may be formed to be spaced apart from one another at different angular intervals. In addition, in the case of the auxiliary cutting edge, it may be formed to be spaced apart from each other by a constant or different angular intervals.

Meanwhile, as shown in FIG. 3, a chip pocket portion 37 is formed between the cutting edges through which the cut chips are discharged. The chip pocket portion adjacent to the leading direction from the main cutting edge 31 is formed by the auxiliary cutting. It is formed deeper than the chip pocket portion adjacent to the leading direction in the blade 33, so that the bone chips cut by the main cutting edge 31 can be discharged more easily than the bone chips cut by the auxiliary cutting edge 33. The cutting force by the main cutting edge 31 has better characteristics than the cutting force by the auxiliary cutting edge 33.

Referring to FIG. 2, the cutting portion 30 of the dental drill according to one embodiment of the present invention includes three main cutting edges 31 extending at approximately 120 degree intervals and between these main cutting edges 31. It includes 15 auxiliary cutting edges 33 are also formed at the same angular spacing. Five auxiliary cutting edges 33 are formed between one main cutting edge 31 and the other main cutting edge 31. These six cutting edges, namely one main cutting edge 31 and five auxiliary cutting edges 33 form a group, and in the embodiment of FIG. 2, the cutting portion 30 has a total of three groups of cutting edges. Is made of. The number of primary cutting edges and auxiliary cutting edges can be changed as necessary, and the present invention is not limited to the above-described embodiments.

The main cutting edge 31 extends from the base of the cutting portion 30, that is, from the end of the body 10 side of the cutting portion to the center point C of the cutting portion.

The auxiliary cutting edges may all have the same length, but according to the invention at least some auxiliary cutting so that the number of cutting edges participating in the cutting may increase as cutting proceeds and the cutting portion 30 is inserted into the bone. The blades preferably have different lengths from each other.

That is, the auxiliary cutting edge has the same length as the main cutting edge 31 and has a length longer than the first auxiliary cutting edge 33a and the first auxiliary cutting edge 33a extending to the center of the cutting portion 30. A second auxiliary cutting edge 33b that is short and does not extend to the center of the cutting part 30, and a third auxiliary cutting shorter than the length of these first auxiliary cutting edges 33a and longer than the length of the second auxiliary cutting edge 33b. Day 33c. The ends of the second auxiliary cutting edge 33b and the third auxiliary cutting edge 33c are bent toward another cutting edge adjacent in the counterclockwise direction, that is, in the rotational direction of the drill, as shown in FIG. It can be formed to.

Referring to FIG. 5, it can be seen that a center protrusion 34 is formed at the center point C of the cutting part 30, and a fine peripheral protrusion 35 is formed around the center protrusion 34. The center projection 34 prevents the cutting portion 30 of the drill from slipping on the bone surface during the drilling operation.

The center point C is a point formed at the center of the cutting part when the cutting part 30 is viewed in a plane, and at the same time, the main cutting edges 31 intersect together (that is, the point where the main cutting edges 31 are concentrated). . The center protrusion 34 of the center point C is the highest point protruding from the surface of the cutting portion 30 and is the point where cutting is first started when the dental drill of the present invention approaches the bone surface vertically.

Peripheral protrusions 35 on the left and right of the central protrusion 34 are formed at points where the curved ends of the main cutting edge 31 and the third auxiliary cutting edge 33c meet. Although only two peripheral protrusions 35 are shown in Fig. 5, all three peripheral protrusions are formed in this embodiment.

As shown in FIG. 2, a virtual circle passing through all of the peripheral protrusions 35 may be considered as the center protrusion 34 as the center of the cutting portion 30 in plan view. It is preferred to have a value of approximately 0.5 to 0.001 relative to the diameter.

On the other hand, the amount of protrusion of the center projection 34 needs to be determined to such an extent that the mucous membrane inside the maxillary sinus bone may not be damaged while being able to reliably hold a slip during drilling by the drill and prevent slippage. As shown in FIG. 4, the cutting unit 30 preferably has a value of 20% to 0.01% of the overall height of the cutting unit 30.

Referring again to FIG. 2, one third auxiliary cutting edge 33c, three first auxiliary cutting edges 33a, and one second auxiliary cutting edge 33b clockwise from the main cutting edge 31. Although this is illustrated as being formed, the present invention is not limited to this embodiment alone, and the arrangement of cutting edges may be appropriately modified within the scope of the present invention.

According to the present invention, since all cutting edges do not extend to the center point C of the cutting portion 30 as described above, all cutting edges do not participate in the cutting at the time when the initial cutting is started, and the cutting operation is performed. As a result, the number of cutting edges gradually participating in cutting increases. That is, according to the embodiment shown in the figure, the first three main cutting edges 31 start cutting, and immediately afterwards, the three first auxiliary cutting edges 33a participate in the cutting, and the third auxiliary cutting edge ( 33c) and the second auxiliary cutting edge 33b sequentially participate in cutting as the cutting is performed.

Further, according to the present invention, after the cutting edge is formed on the surface of the cutting part 30, the cutting edges (main cutting edge and auxiliary cutting edge) are further ground to further sharpen the edge portion of the cutting edge. Accordingly, cutting performance can be improved. When the cutting force is improved in this manner, flexibility can be given to the cutting speed from low speed to high speed, which is preferable. In particular, it is easy to collect the chip during low-speed rotation, the effect of shortening the treatment time during high-speed rotation can give the operator convenience.

In the present specification, the expression that the grinding (or polishing) processing is performed on the cutting edge, that is, the main cutting edge and the auxiliary cutting edge, is generally performed after the mechanical cutting processing used to form the cutting edge of the drill. This may be carried out additionally, which means that the grinding process may be carried out so that the grinding is performed at the same time forming the cutting edge only by the grinding process.

On the other hand, the chip pocket portion 37 formed between the cutting edges may be filled with the cut bone chip, and the chip fills the chip pocket portion 37 between the cutting edges. Accordingly, the distal surface of the cutting part 30 may have a smooth dome shape, so that the cutting edge is in contact with the maxillary sinus membrane but may not damage the maxillary sinus membrane. That is, the larger the number of cutting edges and the better the state in which the present chip is charged to the chip pocket portion, the more damage can be prevented when the cutting portion contacts the mucosa. According to the dental drill of the present invention, since the number of cutting edges of the cutting part 30 is large and the state of charge of the chip is good, damage to the mucosa can be prevented and the cutting edge can be sharpened by polishing.

According to the dental drill of the present invention, between the relatively small diameter body 10 and the relatively large diameter cutting portion 30, a diameter enlargement portion 11 gradually increasing in diameter is formed so that the drill is suitable. The strength can be maintained.

Moreover, between the cutting part 30 and the diameter expansion part 11, the step part 13 which protruded outwardly and the stop part 15 which protrudes further outward from the base end of this step part 13 are provided. Can be formed. As shown in FIG. 6, the stopper 40 may be fitted and fixed to the stepped part 13. The stepped portion 13 may have dimensions for fitting the stopper 40 and the stop 15 prevents the stopper 40 from being inserted anymore. The stepped part 13 is formed in the base of the cutting part 30, and the stop part 15 is formed in the diameter expansion part 11 side.

A plurality of stoppers 40 having different heights may be provided, and the practitioner may selectively fit the stopper 40 of the appropriate dimension into the stepped portion 13 according to the depth of the hole to be formed by the drill. The stopper 40 may limit the drilling depth, which may make the procedure easier for the operator. In addition, even if an accident such as the sliding of the drill on the bone surface during use of the drill, it is possible to prevent the gum from being damaged by the stopper.

Referring to FIG. 7, the stopper 40 partially enclosing the cutting portion 30 includes an engaging portion 41 having an inner circumferential diameter approximately equal to or larger than an outer circumferential diameter of the stepped portion 13, and an inner circumferential diameter. It includes a fitting preventing portion 45 smaller than the outer peripheral diameter of the stepped portion (13).

Coupling portion 41 may be divided into a plurality of pieces by the incision 42 extending up and down as shown in FIGS. 6 and 7. The widths of the pieces or the width of the cutouts formed by dividing by the cutouts may or may not be constant. In addition, the cutouts 42 may be formed at equal intervals or may be formed at uneven intervals.

In order to more securely ensure the engagement state of the engaging portion 41 to the stepped portion 13, a convex protrusion 14 is formed on the base of the stepped portion 13, that is, the surface of the stopped portion 15 side of the stepped portion. In the inner circumferential end of the engaging portion 41, it is preferable that a concave portion 43 that can be fitted to the protruding portion 14 is formed.

In addition, in order to prevent the operator from using the stopper 40 upside down by mistake, as described above, the inner circumferential diameter of the fitting preventing portion 45 is smaller than the outer circumferential diameter of the stepped portion 13 so as to prevent the stopper 40 from being used. It is desirable to make it impossible to insert it upside down. Accordingly, while using the stopper 40 in a state of being coupled upside down by error, it is possible to prevent the accident of dropping the stopper in the mouth of the patient.

The end surface of the stopper 40 can be processed so that the end surface is not smooth by forming a plurality of grooves. In this way, when using the dental drill according to the present invention, the stopper 40 fitted to the stepped portion 13 initially rotates together with the stepped portion 13, but the cutting proceeds and the stopper 40 is placed on the bone surface. In contact, the rotation of the stopper 40 may be stopped. The operator can visually confirm the stop of the stopper 40 and recognize that the cutting part 30 has reached a predetermined depth.

According to the modification of the dental drill according to the present invention, the shape of the cutting portion when viewed from the front side may be formed in various shapes as illustrated in FIG. 8 in addition to the hemispherical shape shown in FIG. 4. That is, the shape of the cutting portion, in addition to the hemispherical shape shown in (a) of FIG. 8, the hemispherical end curve section and the straight section shown in (b) of FIG. 8 are mixed, as shown in (c) of FIG. It may have a square round shape with rounded corners, a rectangular shape shown in FIG. 8 (d), and a tapered shape shown in FIG. 8 (e). On the other hand, although not shown, the tapered shape described above also includes a shape in which the corner portion is rounded.

As described above, the dental drill according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and in the technical field to which the present invention pertains. Of course, various modifications and variations can be made by those skilled in the art.

10: body 11: diameter expansion part
13 stepped part 14 protrusion
15: stop 20: connection
30: cutting part 31: main cutting edge
33: auxiliary cutting edge 33a: first auxiliary cutting edge
33b: 2nd auxiliary cutting edge 33c: 3rd auxiliary cutting edge
34: center protrusion 35: peripheral protrusion
37: chip pocket 40: stopper
41: coupling portion 42: incision
43: recess 45: fitting prevention
47: end surface

Claims (20)

A dental drill comprising a connecting portion formed at an upper end of a body to be connected to a driving device, and a cutting portion formed at a lower end of the body and having a cutting edge for drilling.
The cutting portion includes a plurality of cutting edges arranged in a radially spread shape,
The cutting edge includes a plurality of primary cutting edges and an auxiliary cutting edge disposed between the primary cutting edges,
The main cutting edge is protruded from the surface of the cutting portion so that cutting can be started first when bone cutting starts, and the auxiliary cutting edge additionally participates in cutting after the cutting of the main cutting edge is started. Dental drill. A dental drill comprising a connecting portion formed at an upper end of a body to be connected to a driving device, and a cutting portion formed at a lower end of the body and having a cutting edge for drilling.
The cutting portion includes a plurality of cutting edges arranged in a radially spread shape,
The cutting edge includes a plurality of primary cutting edges and an auxiliary cutting edge disposed between the primary cutting edges,
A plurality of auxiliary cutting edges are formed so that the number of cutting edges participating in the cutting increases as the cutting proceeds and the cutting portion is inserted into the bone, and the auxiliary cutting edges of at least some of the plurality of auxiliary cutting edges have different lengths. Dental drill, characterized in that having. The method according to claim 1 or 2,
And a chip pocket portion adjacent to the main cutting edge in a leading direction at the main cutting edge is formed deeper than a chip pocket portion adjacent to the auxiliary cutting edge in a leading direction at the auxiliary cutting edge. The method according to claim 1 or 2,
The cutting edge may include a main cutting edge extending from the base of the cutting portion to a center point, a first auxiliary cutting edge extending to the center point of the cutting portion with the same length as the main cutting edge, and a length longer than the first auxiliary cutting edge. Dental drills, characterized in that it comprises a second and third auxiliary cutting edge is short and does not extend to the center point of the cutting portion. The method of claim 4,
And the third auxiliary cutting edge is shorter in length than the first auxiliary cutting edge and longer in length than the second auxiliary cutting edge. The method according to claim 1 or 2,
And a plurality of the auxiliary cutting edges are formed, and the auxiliary cutting edges of at least some of the plurality of the auxiliary cutting edges intersect with other cutting edges adjacent in the rotational direction of the drill. The method according to claim 1 or 2,
A dental drill, characterized in that the grinding processing is performed on the cutting edge so that the edge portion of the cutting edge is sharpened. The method according to claim 1 or 2,
Dental drill, characterized in that the diameter expansion portion is gradually formed between the relatively small diameter of the body and the relatively large diameter cutting portion is formed. The method according to claim 1 or 2,
Dental cutting, characterized in that the cutting portion is formed with one or more projections protruding from the surface of the cutting portion. The method according to claim 9,
The protrusion includes a center protrusion formed at the center of the cutting portion where the main cutting edges intersect, and a peripheral protrusion formed around the center protrusion.
Dental drill, characterized in that the diameter of the circle passing through the peripheral projections to the center as a center has a value of 0.5 to 0.001 compared to the diameter of the cutting portion. The method according to claim 9,
The amount of protrusion of the protrusion is a dental drill, characterized in that having a value of 20% to 0.01% of the overall height of the cutting portion. The method according to claim 1 or 2,
A dental drill, characterized in that between the cutting portion and the body, a stepped portion protruding outwardly and a stop portion protruding further outward from the base end of the stepped portion. The method of claim 12,
Dental drill, characterized in that it further comprises a stopper that can be fixed to the stepped portion. The method according to claim 13,
The stopper may include a coupling part having an inner circumferential diameter equal to or larger than an outer circumferential diameter of the stepped portion, and a fitting preventing portion having an inner circumferential diameter smaller than the outer circumferential diameter of the stepped portion. The method according to claim 14,
The coupling is a dental drill, characterized in that can be divided into a plurality of pieces by the incision extending up and down. The method according to claim 14,
Dental drill, characterized in that the protrusion is formed on the base of the stepped portion and the inner peripheral end of the coupling portion is formed to be fitted to the protrusion to ensure the engagement state to the stepped portion. The method according to claim 1 or 2,
Dental drill, characterized in that formed between the cutting edges of the chip pocket is filled with the cut chip. 18. The method of claim 17,
And a stopper fitted to partially surround the cutting portion. The method according to claim 1 or 2,
The cutting part has a shape of any one of hemispherical shape, a shape of a hemispherical terminal curved section and a straight section, a square round shape with rounded corners, a square shape, and a tapered shape. A dental drill characterized in. The method according to claim 1 or 2,
Wherein the length of the cutting edge adjacent to the main cutting edge in the rotational direction of the drill at the main cutting edge is shorter than the length of the cutting edge adjacent to the auxiliary cutting edge in the rotational direction of the drill at the auxiliary cutting edge. drill.

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