TWI472316B - Drill for dental surgery - Google Patents

Description

Dental surgery dental drill [Cross-Reference to Related Applications]

The present application claims priority to and the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the present disclosure.

The present invention relates to a dental drill for performing dental surgery in a patient's mouth, and more particularly to a dental drill for a dental surgery capable of not damaging the maxillary sinus during maxillary sinus surgery. In the case of a membrane, a hole is drilled quickly and safely on the maxillary sinus.

There is an empty space in the skull of the human body, such as the maxillary sinus, frontal sinus, sphenoid sinus, etc., and its purpose is to reduce the weight of the skull and resonate the sound. Further, the membrane exists between this space and the skull. The presence of the membrane, when approaching the maxillary sinus for implantation surgery, leads to the difficulty of performing the surgery.

The problem of implant surgery occurs when a hole for implanting a bone is formed in the space of the maxillary sinus. That is to say, when the blade of the dental drill touches the membrane, or when the maxillary sinus is drilled, the operator suddenly exerts excessive force when the dental drill rotates to perform the operation, and the membrane in the maxillary sinus may be easily torn. When the membrane is torn, problems such as infection of the maxillary sinus may be caused. Therefore, the operator needs to perform the surgery accurately at all times to avoid tearing the film as much as possible.

During the process of performing the drilling operation in the oral cavity by means of a rotating dental drill, the operator determines the hole to be drilled by the maxillary sinus mainly through the feeling of his fingertips. Surgery is an X-ray or computed tomography showing the thickness of the maxillary sinus (computed tomography, CT), after confirming the depth of the drill hole, but the bones in the maxillary sinus have different shapes, such as flat, concave, diaphragm and the like. Therefore, since the inner shape of the maxillary sinus has various shapes, the film may be drilled at any time, thereby causing an operator's burden during the operation.

In order to alleviate the burden on the operator, the related art uses a method of passivating the end surface of the dental drill, low-speed operation of the dental drill or hand mode to reduce the cutting force, and attach the fine-grained diamond grit to the diamond. The tool gnawing the bones, etc., so that even if the blade of the rotating drill hits the film, the film is not torn.

However, the related art allows the blade of the dental drill to be passivated or drilled at a low speed to avoid tearing the film, and thus it takes a longer time for the drilling work.

Further, the removal and cutting of the cut bone fragments may not proceed smoothly, and a part of the bone part to be cut may suddenly become hot due to frictional heat with the bone part, or the film may be excessively forced by the operator. drilling.

The object of the present invention is to improve the clinical success rate after implantation surgery, and to provide a safe and convenient implantation operation through a dental drill capable of preventing damage to the maxillary sinus membrane, thereby quickly and safely removing the maxillary sinus membrane even if the teeth are Straight contact with the maxillary sinus membrane can also prevent damage to the maxillary sinus membrane. At the same time, if the general dental drill uses the lateral approach method (which is the maxillary sinus implantation method), it can maintain the cortical bone of the dental drill. Sponge bone drilling hole Or the inherent function of ream.

According to an exemplary embodiment of the present invention, a dental drill is provided, the dental drill including a connecting portion formed at a top end of the body to be coupled to a driving device, and a cutting portion formed at a bottom end of the body And having a cutting blade for drilling, wherein the cutting portion comprises a plurality of cutting blades, configured in a radially extending manner, and the cutting blade comprises a plurality of main cutting blades spaced apart from each other and having different angular intervals, and is disposed at the main Secondary cutting blade between cutting blades.

The primary cutting blade can be formed to protrude from the surface of the cutting portion to first cut when the bone cutting is started, and the secondary cutting blade participates in cutting after the primary cutting blade begins to cut.

During the cutting process, depending on the extent to which the cutting portion is inserted into the bone, the number of cutting blades involved in the cutting increases, the secondary cutting blades can be formed plurally, and at least a portion of the secondary cutting blades have different lengths.

The cutting blade may include a main cutting blade extending from a bottom portion of the cutting portion to a center point; the first cutting blade is extended upward to a center point of the cutting portion, having the same length as the main cutting blade, And the second cutting blade and the third cutting blade are not extended to the center point of the cutting portion because the length is shorter than the length of the first cutting blade.

The length of the third cutting blade may be shorter than the length of the first cutting blade and may be longer than the length of the second cutting blade.

The secondary cutting blades can be formed in multiple numbers, and at least a portion of the secondary cutting blades intersect the other adjacent secondary cutting blades in the direction of rotation of the dental drill.

The cutting blade can be ground to sharpen the edge portion of the cutting blade.

The dental drill may further include an enlarged diameter portion formed between the body and the cut portion, the diameter of which gradually increases, the body has a relatively small diameter, and the cut portion has a relatively large diameter.

The cut portion may have at least one protruding configuration that protrudes from the surface of the cut portion.

The protruding structure may include a central protruding configuration formed at a center of the cutting portion, the main cutting blade intersecting the center; and a surrounding protruding structure formed around the central protruding structure, centering on the central protruding structure, passing through the surrounding protruding structure The diameter of the circle has a diameter ratio of 0.5 to 0.001 as compared with the diameter of the cut portion.

The protruding amount of the protruding structure is 20% to 0.01% of the total height of the cut portion.

A stepped portion that protrudes outward and a stop portion that protrudes outward from the bottom of the stepped portion may be formed between the cut portion and the body.

The dental drill may further include a stopper that is fixedly inserted into the stepped portion.

The brake may include a coupling portion having a size equal to or larger than an outer circumference diameter of the step portion, and a fitting prevention portion having a diameter smaller than an outer circumference diameter of the step portion.

The combined portion can be divided into a plurality of segments by a vertically extending cut portion.

In order to make the bonding state of the bonding portion and the step portion more stable, the bottom portion of the step portion may have a protruding portion, and the inner peripheral end of the bonding portion may have a concave portion to match the protruding portion.

According to another exemplary embodiment of the present invention, a dental drill is provided, the dental drill including a connecting portion formed at an upper end of the body to be coupled to a driving device; and a cutting portion formed at a bottom end of the body, having a cutting blade for drilling a hole, wherein the cutting portion comprises a plurality of cutting blades, configured in a radially extending form, the cutting blade comprising a main cutting blade that participates in cutting when the cutting portion begins to cut; and a secondary cutting blade in the main cutting The blade begins to cut and then participates in the cutting, and a chip pocket part that fills the cut bone fragments is formed between the cutting blades.

The dental drill can further include a brake mounted to partially surround the cutting portion.

According to another exemplary embodiment of the present invention, a dental drill is provided, the dental drill including a connecting portion formed at an upper end of the main body to be coupled to a driving device; and a cutting portion formed at a bottom end of the main body, And a cutting blade for drilling, wherein the cutting portion comprises a plurality of cutting blades arranged in a radial extension, and the appearance of the cutting portion has a hemispherical shape, a square round shape, a square shape and a pyramid shape (taper shape) At least one of the shapes; in the hemispherical shape, the hemispherical end curve block and the straight block are mixed, and the rounded corners are rounded by the machine.

The present invention is to be understood as being a part of the description of the invention, and the description of the embodiments of the invention.

Hereinafter, a dental drill for dental surgery according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 through 6, according to an exemplary embodiment of the present invention, a dental drill includes a connecting portion 20 formed on an end of a substantially cylindrical body 10 (ie, the top end as seen in FIG. 1). And a driving device (such as a hand disc, a dental operation engine, etc.); and a cutting portion 30 formed on the other end of the main body 10 (i.e., the bottom end seen in Fig. 1) and having a cutting blade for drilling.

The cutting portion 30 has a substantially dome shape, so that when the dental drill is close to the surface of the bone to be cut, the cutting can be performed even if the dental drill does not necessarily approach the bone surface in the vertical direction. Therefore, the surgery can be easily performed in a narrow space in the oral cavity. In the present specification, "dome" means a hemispherical shape, and the concept includes a semi-oval shape or a similar shape having a mixture of an arc portion and a straight portion, for example, a rounded corner of a circle (square Round shape).

The cutting portion 30 has a plurality of cutting blades. As shown in FIG. 2, a plurality of cutting blades have a shape that radiates from a center point C.

The cutting blade can include a plurality of primary cutting blades having different angular intervals and spaced apart from each other; and a plurality of secondary cutting blades disposed between the primary cutting blades. The primary cutting blade is the blade that performs the bone cutting mainly while the drilling operation is in progress, while the secondary cutting blade is the secondary blade that participates in the bone cutting while the drilling operation is in progress.

The main cutting blade can be formed as the most prominent portion from the surface of the cutting portion 30. In this case, when the cutting portion 30 of the dental drill begins to cut the bone, the primary cutting blade is first cut, and after the cutting of the primary cutting blade is performed, the secondary cutting blade additionally participates in the cutting.

The primary cutting blades may be formed to be spaced apart from each other at the same angular interval, or may be spaced apart from each other at different angular intervals. Further, the secondary cutting blades may also be formed to be spaced apart from each other at the same angular interval or at different angular intervals.

Meanwhile, as shown in FIG. 3, the chip pocket portion 37 is formed between the cutting blades, and the cutting chips are removed from the chip pocket portion 37. The portion of the debris pocket facing the guiding direction of the main cutting blade 31 is formed deeper than the portion of the debris pocket directed toward the guiding direction of the secondary cutting blade 33, so that the bone fragments cut by the main cutting blade 31 are made smaller by the secondary The bone fragments cut by the cutting blade 33 are more easily removed, and the cutting force of the main cutting blade 31 is superior to the cutting force of the secondary cutting blade 33.

According to an embodiment of the present invention, when the cutting blade is formed, the chip pocket portion 37 is formed on the surface of the hemisphere by machine cutting to form a cutting blade. As described above, the portion of the chip pocket adjacent to the main cutting blade 31 is formed deeper than the portion of the chip pocket adjacent to the secondary cutting blade 33, so that the height of the main cutting blade is higher than that of the secondary cutting blade. the height of.

In the present specification, the description about "forming the main cutting blade 31, which is the highest protruding portion of the surface of the cutting portion 30" can be regarded as a concept including the case where the debris pocket adjacent to the main cutting blade 31 The partially formed position is deeper than the portion of the debris pocket adjacent to the secondary cutting blade 33, and thus the height of the primary cutting blade is higher than the height of the secondary cutting blade.

Referring to FIG. 2, in accordance with an exemplary embodiment of the present invention, the cutting portion 30 of the dental drill includes three main cutting blades 31 at approximately 120 degrees. The angular extension; and 15 secondary cutting blades 33 are formed between the main cutting blades 31 at the same angular interval. Five secondary cutting blades 33 are formed between a single primary cutting blade 31 and another primary cutting blade 31. Six cutting blades (i.e., one main cutting blade 31 and five secondary cutting blades 33) are formed into one set, and in the embodiment of Fig. 2, the cutting portion 30 is formed by a total of three sets of cutting blades. The number of primary and secondary cutting blades can vary as desired, and exemplary embodiments of the invention are not limited to the embodiments mentioned above.

The main cutting blade 31 extends from the bottom portion of the cutting portion 30 (that is, the end of the body 10 of the cutting portion) to the center point C of the cutting portion.

According to an exemplary embodiment of the present invention, although the secondary cutting blades may have all the same length, at least a portion of the secondary cutting blades may preferably have different when cutting is performed to insert the cutting portion 30 into the bone. The length, and the number of cutting blades involved in cutting can be increased.

That is, the secondary cutting blade includes a first secondary cutting blade 33a extending to the center of the cutting portion 30, having the same length as the primary cutting blade 31; and a second secondary cutting blade 33b having a longer length than the first The secondary cutting blade 33a has a short length and thus does not extend to the center of the cutting portion 30; and the third cutting blade 33c has a length longer than the length of the second cutting blade 33b, and the length thereof is longer than the first time. The length of the cutting blade 33a is short. As shown in FIG. 2, the end of the second secondary cutting blade 33b and the end of the third secondary cutting blade 33c are bent in a counterclockwise direction, that is, bent in the direction of rotation toward other adjacent blades, and may be formed. To intersect with other cutting blades.

According to an embodiment of the present invention, as shown in FIG. 2, in the main cutting blade 31, adjacent to the main cutting blade 31 along the rotational direction of the dental drill (i.e., the guiding direction, as seen from the counterclockwise direction as seen in Fig. 2) The length of the cutting blade (i.e., the second cutting blade 33b) is the shortest among all the cutting blades. In other words, in the direction of rotation of the dental drill, the length of the cutting blade (i.e., the second secondary cutting blade 33b) that is first positioned relative to the primary cutting blade 31 is relatively the first time to be cut in the direction of rotation of the dental drill. The length of the cutting blade adjacent to the first cutting blade from the blade to the third cutting blade 33a, 33b and 33c is short.

Referring to FIG. 5, it can be seen that the central protruding structure 34 is formed at the center point C of the cutting portion 30, and the micro peripheral protruding structure 35 can be formed around the central protruding structure 34. The central protruding configuration 34 may prevent the cut portion 30 of the dental drill from becoming smooth due to the bone surface during drilling operations.

When the cut portion 30 is viewed from the top, the center point C is a point formed at the center of the cut portion, and is an intersection point at which the main cutting blades 31 intersect (i.e., a point at which the main cutting blades 31 are concentrated). The central protruding configuration 34 of the center point C is the highest point protruding from the surface of the cutting portion 30, and when the dental surgical dental drill according to an exemplary embodiment of the present invention is vertically close to the bone surface, it is first cut.

The peripheral protruding structure 35 on the left and right sides of the central protruding structure 34 is formed at a point where the indented end of the main cutting blade 31 and the third secondary cutting blade 33c intersect. Figure 5 shows only two surrounding protruding formations 35, but this exemplary embodiment of the present invention forms a total of three surrounding protruding formations 35.

When looking at the cutting portion 30 from the top down, Figure 2 can assume a virtual circle centered on the central protruding formation 34, passing through all of the surrounding protruding formations 35, wherein the diameter of the circle can be approximately the cutting portion 30. 0.5 to 0.001 times the diameter.

At the same time, when drilling with a dental drill, the protruding portion of the central protruding structure 34 can be accurately positioned so as to ensure that the film of the maxillary sinus is not damaged when the bone of the maxillary sinus is drilled, while avoiding the sliding phenomenon. As shown in Fig. 4, when the cut portion 30 is viewed from the front, the protruding portion is protruded by 20% to 0.01% of the total height of the cut portion.

Further, FIG. 2 shows a single third secondary cutting blade 33c, three first secondary cutting blades 33a, and a single second secondary cutting blade 33b formed from the primary cutting blade 31 in a clockwise direction, but The exemplary embodiments of the invention are not limited thereto. Therefore, the configuration of the cutting blade can be appropriately modified within the scope of the invention.

According to an exemplary embodiment of the present invention, as described above, not all of the cutting blades extend toward the center point C of the cutting portion 30, and therefore, not all of the cutting blades participate in the cutting work at the start of cutting, thus, participating The number of cutting blades that are cut is gradually increasing. That is, according to the exemplary embodiment of the present invention as shown in the drawing, after the three main cutting blades 31 start cutting, three first-time cutting blades 33a are involved in cutting, and the third time The cutting blade 33c and the second secondary cutting blade 33b sequentially participate in cutting at the time of cutting.

Further, according to an exemplary embodiment of the present invention, after the cutting blade is formed on the surface of the cutting portion 30, the cutting blade is reground (mainly The cutting blade and the secondary cutting blade) make the edge portion of the cutting blade sharper. Therefore, the cutting performance can be improved. When the cutting force is improved, the cutting speed can be elastically changed from a low speed to a high speed. Especially at the time of low-speed rotation, it is preferable to easily pick up bone fragments and the like, and at the time of high-speed rotation, the operation time can be shortened, and thus the operator can easily perform the surgery.

In the present specification, machine grinding (polishing) is performed for the cutting blade, that is, the main cutting blade and the secondary cutting blade may be additionally machined after being mechanically ground to form a cutting blade of the dental drill. And when the cutting blade is formed only by machine grinding, machine grinding can be performed to perform grinding.

At the same time, the debris pocket portion 37 formed between the cutting blades can be filled with the cut bone fragments. When the bone fragments fill the debris pocket portion 37 between the cutting blades, the end surface of the cutting portion 30 has a smooth dome shape to prevent damage when the maxillary sinus membrane hits the cutting blade. That is, when the number of cutting blades is increased and the bone fragments are filled in the debris pocket portion, the film may be damaged when the cutting portion hits the film. According to the dental drill for an exemplary embodiment of the present invention, when the number of cutting blades of the cutting portion 30 is increased and the filling state of the bone fragments is good, the film may be prevented from being damaged and the cutting blade may be sharpened by grinding.

According to the dental drill for an exemplary embodiment of the present invention, the enlarged diameter portion 11 has a gradually increasing diameter which is formed between the body 10 having a relatively small diameter and the cutting portion 30 having a relatively large diameter. Such a dental drill can maintain proper strength.

In addition, the step portion 13 protrudes outward, and the stopping portion 15 further The ground protrudes outward from the bottom end of the step portion 13, and both can be formed between the cut portion 30 and the enlarged diameter portion 11. As shown in FIG. 6, the brake 40 can be fixedly inserted into the step portion 13. The stepped portion 13 may have a size suitable for the brake 40, and the stop portion 15 prevents the brake 40 from being inserted therein. The stepped portion 13 is formed on the bottom of the cut portion 30, and the stop portion 15 is formed in the enlarged diameter portion 11.

A plurality of brakes 40 having different heights may be provided, and an operator may use a brake 40 of an appropriate size to selectively insert the stepped portion 13 according to the depth of the hole to be formed by the drill. The depth of the borehole can be limited by the brake 40, which allows the operator to perform the procedure more easily. In addition, the brake may avoid gum injury even if an accident such as a dental drill sliding on the surface of the bone occurs when the dental drill is used.

Referring to Fig. 7, a portion of the brake 40 surrounding the cutting portion 30 includes a joint portion 41 having a circumference approximately equal to or larger than the diameter of the outer circumference of the step portion 13; and a joint preventing portion 45 having an inner diameter It is smaller than the outer diameter of the step portion 13.

As shown in FIGS. 6 and 7, the joint portion 41 can be divided into a plurality of segments by the vertically extending cut portion 42. The width of the segment (or the width of the cut portion) of the segment divided and formed by the cut portion may be fixed or may not be fixed. Further, the cutting portions 42 may be formed at equal distances or may be formed at unequal distances.

In order to make the bonding state of the joint portion 41 and the step portion 13 more stable, the projecting protruding portion 14 is formed on the surface of the bottom portion of the step portion 13, that is, the stop portion 15 of the step portion and the joint portion. Within 41 The peripheral end may be provided with a concave portion 43 conforming to the protruding portion 14.

Further, as described above, in order to prevent the operator from mistakenly coupling the brake 40 in the reverse direction, the inner circumference diameter of the engaging portion 45 is prevented from being smaller than the outer circumference diameter of the step portion 13, so that it is impossible to insert the stopper 40 into the step portion in the reverse direction. Within. Therefore, it is possible to prevent the accident that the brake 40 falls into the patient's mouth during use in the case where the brake 40 is reversely coupled to the step portion 13.

The end surface 47 of the brake 40 is formed by a plurality of grooves such that its end surface can be machined to make it unsmooth. When the dental drill is used, the brake 40 inserted into the step portion 13 rotates together with the step portion 13, but if the brake 40 hits the bone surface during the cutting, the rotation of the brake can be stopped. It can be understood that the operator can confirm the stop of the brake through his/her own eyes and confirm that the cutting portion 30 reaches the predetermined depth.

According to an exemplary embodiment of the dental drill of the present invention, when viewed from the front, in addition to the hemispherical shape as shown in FIG. 4, the shape of the cut portion may have a different shape, as shown in Fig. 8(a) to Fig. 8(e). That is, in addition to the semicircle shown in Fig. 8(a), the cut portion may have a curved block as shown in Fig. 8(b) and a hemispherical shape in which the straight block is mixed, Fig. 8(c) The corners shown are rounded by the machine, rounded as shown in Figure 8(d), and tapered as shown in Figure 8(e). Meanwhile, although the drawings are not shown, the above-mentioned taper includes a shape in which the corners are rounded by a machine.

As described above, the exemplary embodiment of the present invention can provide a dental drill for removing the maxillary sinus membrane quickly and safely, thereby preventing the maxillary sinus even when the dental drill directly contacts the maxillary sinus membrane. Membrane Loss, while maintaining the inherent function of drilling and expanding the cortical bone and the cavernous bone, as in the case of a general dental drill using the lateral approach method, which is a maxillary sinus implantation procedure.

Further, according to the dental drill for dental surgery according to an exemplary embodiment of the present invention, the front end of the dental drill has a dome shape, so that the dental drill does not need to be close to the bone surface in a direction perpendicular to the surface of the bone, so even in a narrow Surgery is also convenient in the space.

Further, according to the dental drill for an exemplary embodiment of the present invention, when the front end of the dental drill is dome-shaped, the cut bone fragments can be easily filled between the blades, so even when the blade of the dental drill directly contacts the maxillary sinus When the membrane is used, the maxillary sinus membrane can be safely removed.

Moreover, the exemplary embodiment of the present invention can be safely removed by maximally approaching the maxillary sinus membrane during maxillary sinus surgery, thereby reducing the surgical portion, inhibiting the occurrence of post-operative edema, and reducing The use of bone implant materials.

As described above, although dental drills according to exemplary embodiments of the present invention are described with reference to the drawings, the present invention is not limited by the foregoing exemplary embodiments and drawings, and therefore, the present invention has Generally, the knowledge can be modified and changed in the scope of patent application.

10‧‧‧ Subject

11‧‧‧Diameter enlarged part

13‧‧‧step part

14‧‧‧ highlight

15‧‧‧Stop part

20‧‧‧Connected parts

30, 42‧‧‧ cutting part

31‧‧‧Main cutting blade

33‧‧‧ secondary cutting blades

33a‧‧‧The first time to cut the blade

33b‧‧‧The second time to cut the blade

33c‧‧‧The third time to cut the blade

34‧‧‧Central protruding structure

35‧‧‧ surrounding structures

37‧‧‧Shard pocket part

40‧‧‧ brake

41‧‧‧Combined part

43‧‧‧ concave part

45‧‧‧Protection of joints

C‧‧‧ center point

1 is a front elevational view of a dental drill for use in accordance with an exemplary embodiment of the present invention.

2 is a plan view of a cut portion of a dental drill for use in accordance with an exemplary embodiment of the present invention.

3 is a perspective view of a cut portion of a dental drill for use in accordance with an exemplary embodiment of the present invention.

4 is a front elevational view of a cut portion of a dental drill for use in accordance with an exemplary embodiment of the present invention.

Figure 5 is a partial enlarged view of a cut portion of a dental drill for use in accordance with an exemplary embodiment of the present invention.

6 is a front elevational view of a dental drill for use in accordance with an exemplary embodiment of the present invention.

7 is a cross-sectional view of a brake for a dental surgery dental drill in accordance with an exemplary embodiment of the present invention.

8(a) through 8(e) are schematic views of different shapes of a dental drill for use in accordance with an exemplary embodiment of the present invention.

10‧‧‧ Subject

11‧‧‧Diameter enlarged part

13‧‧‧step part

14‧‧‧ highlight

15‧‧‧Stop part

20‧‧‧Connected parts

30‧‧‧cutting part

Claims (20)

A dental drill for use in a dental operation, comprising a connecting portion formed at a top end of the main body and a cutting portion, the connecting portion being formed at a bottom end of the main body and having a drilling hole a cutting blade, wherein the cutting portion includes a plurality of cutting blades that are disposed to extend radially, and the cutting blade includes a plurality of primary cutting blades and a plurality of secondary cutting blades, between the primary cutting blades An angular spacing is provided and the secondary cutting blade is disposed between the primary cutting blades, wherein at least a portion of the secondary cutting blades have different lengths. The dental drill according to claim 1, wherein the main cutting blade is formed to protrude from a surface of the cutting portion, so that when the bone cutting is started, the cutting is first performed, and the cutting is performed. The cutting blade is then engaged in cutting after the main cutting blade begins to cut. The dental drill according to claim 1, wherein in the cutting process, the number of the cutting blades participating in the cutting increases according to the degree of insertion of the cutting portion into the bone. The cutting blade is to be formed in plural. The dental drill according to claim 1, wherein the cutting blade comprises the main cutting blade, a first secondary cutting blade, a second secondary cutting blade, and a third secondary cutting blade, The main cutting blade extends upward from the bottom of the cutting portion to a center point, and the first secondary cutting blade extends upward to a center point of the cutting portion and has the same shape as the main cutting blade Length, the second cut The blade and the third secondary cutting blade are shorter than the length of the first cutting blade and do not extend to the center point of the cutting portion. The dental drill according to claim 4, wherein the third secondary cutting blade has a shorter length than the first secondary cutting blade and is smaller than the second secondary cutting blade The length is long. The dental drill according to claim 1, wherein the secondary cutting blade is formed in plural, and at least a portion of the secondary cutting blade is adjacent to another adjacent secondary cutting blade. The teeth are intersected in the direction of rotation. The dental drill for dental surgery according to claim 1, wherein the cutting blade is ground to sharpen an edge portion of the cutting blade. The dental drill according to claim 1, further comprising an enlarged diameter portion formed between the main body and the cutting portion, wherein the enlarged diameter portion has a gradually increasing diameter, The body has a relatively small diameter and the cutting portion has a relatively large diameter. The dental drill for dental surgery according to claim 1, wherein the cutting portion has at least one protruding configuration protruding from a surface of the cutting portion. The dental drill according to claim 9, wherein the protruding structure includes a central protruding structure and a surrounding protruding structure, the central protruding structure is formed at a center of the cutting portion, and the main cutting a blade intersecting the center, the peripheral protruding structure being formed in the The circumference of the central protruding structure is passed through the surrounding protruding structure, and a circle centered on the central protruding structure has a diameter of 0.5 to 0.001 as compared with the diameter of the cut portion. The dental drill for dental surgery according to claim 9, wherein the protruding structure has an amount of protrusion of 20% to 0.01% of the total height of the cut portion. The dental drill according to claim 1, wherein a stepped portion that protrudes outward is formed between the cutting portion and the body, and a bottom portion of the step portion is further outward. Prominent stop part. The dental drill for dental surgery according to claim 12, further comprising a brake fixedly inserted in the step portion. The dental drill according to claim 13, wherein the brake includes a joint portion and an anti-joining portion, and an inner circumference diameter of the joint portion is equal to or larger than an outer circumference of the step portion. The diameter, the inner circumference diameter of the joint preventing portion is smaller than the outer circumference diameter of the step portion. The dental drill for dental surgery according to claim 14, wherein the cutting portion is divided into a plurality of segments by the vertically extending cutting portion. The dental drill according to claim 14, wherein the bottom end of the stepped portion has a protrusion in order to make the joint state of the joint portion and the stepped portion more stable. And said The inner peripheral end of the joint portion has a concave portion, and the concave portion conforms to the protruding portion. The dental drill according to claim 1, wherein a length of the cutting blade adjacent to the main cutting blade from the main cutting blade is along a direction of rotation of the dental drill, The length of the cutting blade adjacent to the secondary cutting blade is shorter from the secondary cutting blade than in the direction of rotation of the dental drill. The dental drill for dental surgery according to claim 1, wherein a debris pocket portion filled with cut bone fragments is formed between the cutting blades. The dental drill for use in claim 18, further comprising a brake that is mounted to partially surround the cutting portion. The dental drill for dental surgery according to claim 1, wherein the cut portion has a hemispherical, hemispherical end curve block and a shape in which the straight block is mixed, and the corner is rounded by a machine round. At least any of the shapes of squares and cones.