KR101516949B1 - apparatus for bone flattening drill - Google Patents

Abstract

The present invention provides a bone flattening drill apparatus in order to reduce surgery time and enhance accuracy and stability in placing implant by improving accuracy of a hole perforated in the alveolar bone for placing the implant. The bone flattening drill apparatus includes: a shank part forming an installation part coupled to a dental handpiece at an upper end part; a cylindrical guide body coupled to a lower side of the shank part and rotating in one body, and having an outer diameter corresponding to an inner circumference of a guide hole such that it is formed according to an oral cavity profile on a stent wrapped around periodontal tissue to be fixed and is inserted into the guide hole guiding a position where a fixture is placed to be rotationally supported; and a drill part connected to a lower part of the guide body part, having a side cutting part rounded as an external profile is extended downwards to cut a gum at the position where the fixture is placed, and having a flattening cutting part horizontally forming a flattening cutting blade at a lower end of the side cutting part to flatten the alveolar bone at the position where the fixture is placed.

Description

Apparatus for bone flattening drill

[0001] The present invention relates to a plate drilling apparatus, and more particularly, to a plate drilling apparatus that improves the precision of perforation formed on an alveolar bone so that an implant can be placed, thereby reducing the time required for implant placement and improving the accuracy and stability of implant placement. To a drilling apparatus.

Generally, an implant refers to a substitute for replacing a human tissue when the original human tissue is lost, but refers to implanting an artificial tooth in the dentistry. To replace the missing tooth root, a fixture made of titanium or the like which has no rejection to the human body is planted in the alveolar bone that has been taken out of the tooth, and then the tooth is restored by fixing the artificial tooth.

In the case of general prostheses or dentures, the surrounding teeth and bones are damaged over time, but the implants can prevent damage to the surrounding dental tissues and can be used stably because there is no secondary cause of tooth decay. In addition, since the implant has the same structure as the natural teeth, there is no pain or foreign body sensation of the gums, and it is advantageous that the implant can be used semi-permanently.

FIG. 1 is a flowchart illustrating a conventional implant procedure. FIGS. 2A, 2B, and 2C illustrate a conventional gum removal procedure and fixture placement.

As shown in FIGS. 1 to 2C, the conventional implant procedure includes a primary procedure (s1, s2, s3, s4) of placing a fixture in the alveolar bone, a time To 6 months) and fixing the final prosthesis (s5, s6).

First, the primary procedure includes a gum removal step (s1) for opening the gum of a tooth-missing part, a multistage drilling step (s2) for forming a perforation where the fixture is to be placed, a fixture placement step (s3) And a step (s4) of binding temporary teeth to the tooth tip.

Specifically, the gums are removed through a tissue punch or the like in the gum removal step (s1), and the alveolar bone at the position where the fixture is placed is exposed. Then, the exposed portion of the alveolar bone is subjected to a multi-step drilling step (s2) to form a perforation for fixture placement.

At this time, the multi-step drilling step (s2) may include forming an initial hole, expanding a hole, forming a thread in a hole, and removing a remaining alveolar bone in the hole. Depending on the type of drill and the drilling method used, it can be varied.

Then, the fixture is placed on the perforations formed through the multi-step drilling step (s2) (s3), and the temporary teeth are coupled to the fixture placed (s4), thereby completing the primary procedure.

Here, the fixture placed in the perforation serves as the root of the artificial tooth. Therefore, it is very important to form an accurate hole in the multi-step drilling step (s2) in order to provide a stable and fast restoration process in which the alveolar bone forms osseointegration with the fixture and provides a stable bonding force between the alveolar bone and the fixture after the osseointegration. And the completeness of artificial tooth formation through implant treatment is determined.

2A and 2B, the alveolar bone 1 is supported by the root of the tooth 3 being joined, and the gum 2 is wrapped around the alveolar bone 1. Here, the alveolar bone 1 in the oral cavity is not a flat surface but a curved or irregular inhomogeneous shape.

However, when the tissue punch 4 or the like used in the conventional gum removal step is to remove the gums at the position where the fixture is to be placed and form the portion 5 where the alveolar bone is to be exposed, the bending or irregularity of the alveolar bone 1 It is not possible to completely remove the gum 2a formed thereon, so that the remaining gums 2a are scraped off using an additional equipment or an additional gum removal procedure is required. As a result, not only the procedure time is increased but also the patient is burdened due to an increase in the procedure time.

In addition, the gums which have not been completely removed have a problem in that the formation of the perforations 6 causes the penetration into the perforations to slow the recovery of the alveolar bone and reduce the bonding force between the alveolar bone and the fixture, thereby reducing the completeness and stability of the artificial teeth.

2C, when a multilevel drilling step is performed in a state where the exposed alveolar bone 1 is not planar, an error is generated between the formed perforations 6 and the positions of perforations designed by the initial simulation there was. Of course, although a separate guide member such as a stanchion for guiding drilling is provided, if the alveolar bone 1 is not flat, the drill end can not be stably stuck on the surface of the alveolar bone 1, The precision is significantly reduced.

The position of the perforation (8) at the time of simulation is determined considering the shape of the residual alveolar bone in the oral cavity and the bone mass distribution around the perforation (8), considering stable fixation of the fixture (6) do.

Therefore, when the perforation 8 can not be formed at a precisely designed position, it is possible to cause insufficient depth of the fixture 6, lack of bone mass on the side of the fixture 6, Resulting in side effects such as damage to the alveolar bone (1) due to tooth imbalance and lack of bone mass.

Further, when the fixture 6 can not be stably placed due to the error of the perforation 8 formation, the alveolar bone 1 is implanted to form a new perforation, or the alveolar bone 1 is restored, So that the burden of time and cost is increased and the burden of the burden is given to the medical staff performing the implant.

Korean Patent No. 10-0829243

In order to solve the above problems, it is an object of the present invention to provide a plate drilling apparatus which improves the accuracy of perforation formed on the alveolar bone so that the implant can be placed, thereby shortening the procedure time at the time of implant placement and improving the accuracy and stability of implant placement. We will do it.

According to an aspect of the present invention, there is provided a dental handpiece comprising: a shank portion having a mounting portion coupled to a dental handpiece at an upper end; A guide member for guiding a position where the fixture is to be inserted and inserted into a guide hole formed in the inside of the guide hole and rotatably supported by the guide member, A cylindrical guide body portion having an outer diameter corresponding to an inner circumference; And a side cutting portion connected to a lower portion of the guide body portion and formed to be rounded as the outer surface profile extends downward to cut the gum at a position where the fixture is to be inserted. The alveolar bone of the position where the fixture is placed is flattened And a drill portion having a flat cutting portion having a flat cutting edge formed horizontally at a lower end of the side cutting portion.

Here, the outer side profile of the side cutting portion is formed into a convex arcuate shape with a decreasing diameter toward the lower side, a side cutting edge is formed at the end portion in the rotation direction of the side cutting portion, and an outer surface of the upper portion in the opposite direction of rotation is formed along the circumferential direction It is preferable to extend to round.

In addition, concave arcuate grooves are formed on the side opposite to the rotation direction of the side cutting portion so as to correspond to the outer surface profile of the side cutting portion from the flat cutting edge upwardly so as to guide the discharge of the alveolar bone, It is preferable that the cutting edges are connected by the cutting guide surface, and the respective connecting portions are bent.

The flat cutting portion may include a slide surface formed to be sloped upward on the side opposite to the rotation direction of the flat cutting edge, wherein the side cutting portion and the flat cutting portion are spaced apart from each other along the circumferential direction, Is preferably arranged radially with respect to the rotation center point.

In this case, a fluid flow groove is formed in the lower portion of the guide body, and the fluid flow groove has a concave round surface facing the rotation center side on the upper side, and a fluid guide surface Is formed.

Through the above solution, the present plating drilling apparatus according to the present invention provides the following effects.

First, since the side cutting edge is provided on the side of the drill part and the flat cutting part is provided on the lower part, the gingival portion of the exposed portion of the alveolar bone is removed, and the alveolar bone is flattened by the bending of the fixture- It is possible to remarkably improve the accuracy of aligning the perforation position for fixture placement in the drilling step which is a subsequent procedure. Thus, if an abutment / crown is manufactured, it is possible to provide an infrastructure device capable of completing gum removal, fixture hole drilling, fixture placement, and abutment / crown installation in a single procedure have.

Secondly, the outer side profile of the side cutting portion is formed to be rounded inward as it extends downward, and the lower side of the removed gum portion is formed to expose the alveolar bone corresponding to the area of the portion where the fixture is placed, It is possible to minimize the interference of the gums and minimize the loss of the gums and alveolar bone when the fixture and temporary teeth are placed.

Thirdly, the side cutting edge and the flat cutting edge are connected to a cutting guide surface connected to an arc surface groove formed to be rounded upward, so that the cut gum and alveolar bone are moved toward the arc surface groove side along the cutting guide surface, And the durability of the product can be improved as the cutting force is stably maintained.

Fourthly, since the outer surface of the side cutting portion extends from the side cutting edge formed on the side in the rotation direction to the side opposite to the rotation direction and the upper side is extended widely, a heat exhaust surface is formed between the arc surface groove portion and the side cutting edge, And the safety of the product can be improved by preventing the heat of the gums due to overheating of the side cutting blades.

1 is a flowchart showing a conventional implant procedure.
FIGS. 2A, 2B and 2C are views showing a conventional gum removal process and fixture placement. FIG.
3 is a perspective view of the present plate drilling apparatus according to an embodiment of the present invention;
4 is a side view of the present plate drilling apparatus according to an embodiment of the present invention;
5 is a rear view of the present plate drilling apparatus according to an embodiment of the present invention;
6A and 6B are schematic diagrams illustrating the use of the present plate drilling apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a plating drilling apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view of the present plate drilling apparatus according to an embodiment of the present invention, FIG. 4 is a side view of the present plate drilling apparatus according to an embodiment of the present invention, and FIG. FIGS. 6A and 6B are schematic views illustrating the use of the present plate drilling apparatus according to an embodiment of the present invention.

3 through 6B, the plate drilling apparatus 100 according to an embodiment of the present invention includes a shank portion 10, a guide body portion 20, and a drill portion 50. As shown in FIGS. In detail, the present plate drilling apparatus 100 is used in a preceding procedure of multi-step drilling to form a perforation for placement of a fixture in an implant procedure. In order to remove a gum at a position where the implant is placed in the oral cavity Is used.

The shank portion 10, the guide body portion 20 and the drill portion 50 may be integrally formed by cutting a metal member. The side cutting edge of the drill portion 50, It is also possible that the cutting edge is separately provided for convenience of replacement when the cutting edge is damaged.

Referring to FIG. 3, the shank portion 10 has a mounting portion 11 coupled to a dental handpiece at an upper end thereof. Here, the dental handpiece may be a hand drill device used to provide a rotational force to the present plate drilling device 100, and a coupling part coupled to the mounting part 11 may be formed at one side thereof.

At this time, the coupling portion transmits the rotational force to the mounting portion 11. [ The mounting portion 11 is provided in a D-cut shape and can rotate integrally with the engaging portion. In addition, a locking groove 12 is formed on the lower side of the mounting portion 11 so that the shank portion can be securely fastened without detaching from the engaging portion.

The shank portion 10 connects the dental handpiece with the guide body portion 20 and can transmit the rotational force transmitted to the mounting portion 11 to the guide body portion 20. The shank 10 may be formed independently of the diameter of the guide body 20 or the drill 50 but may be smaller in diameter than the guide body 20 .

At this time, the shank portion 10 may be formed in a cylindrical shape. Therefore, the shank portion 10 firmly supports the guide body portion 20 and the drill portion 50 during high-speed rotation, and can be improved in durability by preventing rotation damage such as warping and twisting However, it is possible to prevent the accuracy of drilling from being reduced due to vibration due to rotation damage.

4 to 6A, the guide body 20 is connected to the lower side of the shank portion 10 and is integrally rotated. Here, the guide body 20 is provided in a cylindrical shape having an outer diameter corresponding to the inner circumference of the guide hole 9a of the stance 9. [

In detail, since it is difficult to grasp the exact position and direction to be performed when forming the perforation in which the fixture is to be inserted in the implant procedure, an assistant device such as a stent (9) is used.

Here, the stent 9 is formed into a profile inside the oral cavity. At this time, the stent 9 is fixed around teeth and gums of teeth and gums of a bodily or edentulous patient, and a guide hole 9a is formed at each position where the implant is required. Preferably, the guide hole 9a is provided in a cylindrical hole, and the guide hole 9a rotates and supports the drill device inserted therein.

As described above, the guide body 20 is inserted into the guide hole 9a and is slid forward and rearward, and is rotatably supported in the guide hole 9a, thereby improving the accuracy in the gum removal procedure .

In addition, the guide body 20 and the guide hole 9a may be provided with various diameters depending on the kind of the natural tooth to be replaced with the implant. In detail, the fixture that becomes the root of the artificial tooth has dimensions of 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, and the like, so that the diameter of the drill is about 3.0 mm, 3.5 mm, 4.0 mm, Can be selected. That is, the guide body 20 and the guide hole 9a are preferably selected to have a size corresponding to the diameter of the drill.

The guide body portion 20 is provided with a depth adjusting portion 21 marked in a circumferential direction along an outer circumferential surface thereof to indicate a depth inserted into the guide hole 9a and to control a cutting degree of the alveolar bone 1 . The depth adjusting portions 21 may be spaced apart from each other at predetermined intervals along the direction of the axis of rotation.

The operator can confirm the marking of the depth adjusting part 21 in the guide body 20 inserted in the guide hole 9a to confirm the depth of insertion of the drill part 50. [ Therefore, the practitioner can perform the procedure with an accurate depth according to the shape of the alveolar bone 1 and the bone distribution of the patient confirmed by CT photographing or the like. Accordingly, it is possible to minimize the loss of the alveolar bone 1 in the patient's mouth and to remove the gum at the portion where the fixture is to be placed, and to perform a planarization operation for drilling the perforation to be inserted into the fixture.

Further, it is preferable that a fluid flow groove 22 is formed under the guide body 20. The fluid flow groove 22 has a fluid guide surface 22b formed on an upper portion thereof with a concave round surface 22a facing toward the rotational center side and cut at a lower portion so as to be continuous with the upper end of the side cutting portion 40, Can be formed.

Specifically, in the gum removal procedure, the drill 50 is rotated at a high speed to cut a portion of the gum and alveolar bone. At this time, frictional heat is generated when the side cutting portion 30 and the flat cutting portion 40 come into contact with the gum or alveolar bone and rotate.

Since the frictional heat can heat the gingival tissue or necrotize the osteocyte of the alveolar bone, the cooling water for cooling during rotation is supplied. The cooling water may be supplied to the outer surface 33 of the side cutting portion 40 along the concave round surface 22a and the fluid guide surface 22b when cooling water is introduced into the fluid flow groove portion 22 at this time .

The drill unit 50 includes a side cutting unit 30 for removing gums at a position where the fixture is placed and a flat cutting unit 40 for flattening the alveolar bone at a position where the fixture is placed.

Here, the drill portion 50 is connected to the lower portion of the guide body portion 20. At this time, the drill part 50 may be integrally formed with the guide body part 20, or may be coupled with another member.

Further, the side cutting portion 30 includes a side cutting edge 31, a cutting guide surface 32, and an arc surface groove portion 34. Here, the side cutting portion 30 is formed to be rounded as the outer surface profile extends downward. Here, the outer surface profile refers to the shape based on the outer surface 33 of the side cutting portion 30 and the height from the center of rotation.

In detail, the outer side profile of the side cutting portion 30 is formed into a convex arcuate shape with a reduced diameter toward the lower side. In other words, the outer surface profile of the side cutting portion 30 is formed so as to be convex on the virtual surface (a) away from the virtual surface (a) extending downward in parallel with the outer peripheral surface of the guide body portion (20) .

That is, it has a shape that its diameter decreases from the upper side to the lower side, and the flat cutting portion 40 is connected to the lower side of the side cutting portion 30.

When the flat cutting portion 40 is in contact with the gum 2 at the portion where the fixture is to be placed to form a hole having a small diameter, the side cutting edge 31 formed on the side surface of the side cutting portion 30 You can remove the gums by extending the side of the hole.

Therefore, the lower side of the gum portion removed by the side cutting portion 30 is formed to expose the alveolar bone 1 in correspondence with the area of the portion where the fixture is placed, and the upper side can be formed to be wide. Accordingly, when the fixture is placed on the perforation formed in the alveolar bone 1 or the temporary tooth is attached to the fixture, it can be easily and accurately inserted without being disturbed by the gum.

It is preferable that the side cutting edge 31 is formed on the side of the side cutting portion 30 in the rotation direction and the cutting guide surface 32 is connected to the side edge of the side cutting edge 31 in the rotation direction. The cutting guide surface 32 may be connected to the arc surface groove 34 for guiding the removal of the alveolar bone.

Specifically, the cutting guide surface 32 is formed to extend from the side cutting edge 31 toward the center of rotation, and the cutting guide surface 32 is bent and connected to the side cutting edge 31. Thus, the gum cut at the sharp end of the side cutting edge 31 can flow into the arc edge groove 34 along the cutting guide surface 32.

It is preferable that an arc surface groove portion 34 is connected to the cutting guide surface 32 and the cutting guide surface 32 and the arc surface groove portion 34 are bent and connected to each other. Here, the arc surface groove portion 34 may be formed to be concave by expanding from the flat cutting edge 41 toward the upper side corresponding to the outer surface profile of the side cutting portion.

In detail, the upper surface of the cutting guide surface 32 is formed with an arc surface groove portion 34 forming an inward concave round surface and connected to the outer circumferential surface of the guide body portion 20.

The gum 2 cut by the side cutting blade 31 flows toward the arc surface groove portion 34 along the cutting guide surface 32 so that the cut gum 2 is guided to the side cutting edge 31 The cutting force is stably maintained, thereby enhancing the durability of the product.

The outer surface 33 of the side cutting portion 30 is formed to be inclined from the side of the side cutting edge 31 formed on the side in the rotation direction to the side opposite to the rotation direction, .

The outer surface 33 of the side cutting portion 30 may be roundly extended along the circumferential direction toward the upper side. That is, the outer surface 33 extends toward the opposite direction of rotation along the side cutting edge 31 to form a heat exhaust surface, and a round surface groove portion 34 may be formed at a portion formed by rounding.

In detail, the outer surface 33 of the side cutting portion 30 serves as a heat exhaust surface between the arc surface groove portion 34 and the side cutting edge 31. At this time, the outer surface 33 is connected to the side cutting edge 31 to provide an area where heat can be smoothly discharged.

Accordingly, thermal damage to the side cutting edge 31 can be prevented during rotation cutting, and secondary damage of the gum due to overheating of the side cutting edge 31 can be prevented, so that safety of the product can be improved.

In addition, the outer surface 33 is narrow in the lower side and wider in the upper side, so that the arc surface groove portion 34 capable of storing the cut gum and the alveolar bone between the other side cutting edge and the other side cutting edge can be formed.

4 to 6B, the flat cutting portion 40 is connected to the lower end of the side cutting portion 30, and the flat cutting edge 41 is horizontally formed. Here, the flat cutting edge 41 extends along the side cutting edge 31 and is provided on the lower side of the side edge milling cutter 30. The flat cutting portion 40 may be provided with a slide surface 42 formed at an upper portion of the flat cutting edge 41 in a direction opposite to the rotation direction of the flat cutting edge 41.

In more detail, the side cutting portion 30 and the flat cutting portion 40 are spaced apart from each other along the circumferential direction, and the flat cutting edge 41 is disposed radially with respect to the rotation center point.

That is, the slide surface 42 extending obliquely from the flat cutting edge 41 to the side opposite to the rotation direction extends to the side of the adjacent flat edge, and the slide surface 42 does not contact the other flat edge And comes into contact with the cutting guide surface.

As a result, a step is formed on the rotation center side where each flat cutting edge 41 meets, so that the flat cutting edge 41 can form a cutting force from the rotation center point to the outer end side.

The gum 2 and the alveolar bone 1 cut by the flat cutting edge 41 are moved to the arc surface groove portion 34 along the cutting guide surface 32 to be cut into the gum 2 and the alveolar bone 1 is clogged with the flat cutting edge 41 and the cutting force is prevented from being reduced.

The flat cutting edge 41 flattens the irregular alveolar bone 1 and removes the gums. Thus, the irregular removal of the irregular portion of the alveolar bone 1 can be completely performed without removing gums by a single operation, The gum removal procedure time can be shortened.

The drilling is carried out through a drill rotating at a high speed. The drilling is performed through a multi-stage drilling at the time of fixture placement, and a fixture is placed at the drilling. At this time, when the end portion of the drill is rotated by touching the alveolar bone 1 with the bend, the end position can easily be shifted from the designed position due to the vibration generated when the drill is rotated, have.

Of course, even if the drill is rotatably supported in the guide hole of the stalk, because there is a clearance between the guide hole and the drill, unless the alveolar bone is flattened, the end portion of the drill may deviate from the initially designed position or direction by high-

In the case of the present invention, since the alveolar bone 1 of the fixture-mounting part is planarized, the end of the drill can be stably stuck to the alveolar bone 1 during the subsequent multi-step drilling step, Can be improved.

Therefore, the perforation formed by the drilling can be precisely formed according to the initial simulation design, and it is possible to form the perforation precisely without re-operation due to the puncturing error, so that the disappearance of the alveolar bone 1 is minimized, Can be shortened. In addition, in the recovery step, the alveolar bone 1 and fixture can be stably and firmly fixed, and the completion of the implant treatment can be remarkably improved.

Further, in the case where the abutment / crown is manufactured through the improvement of the accuracy of aligning the puncturing positions for the fixture placement in the drilling step, the gum removal, the fixture placement hole drilling, the fixture placement and the abutment / ≪ / RTI > crown installation can be completed.

It is preferable that the arc surface groove portion 34 is formed so as to extend from the flat cutting edge 41 in correspondence with the outer surface profile of the side cutting portion 30 toward the upper side and the inner surface of the upper side is concave toward the rotation center side.

Here, the arc surface groove portion 34 is formed to have a narrow diameter on the end side of the flat cutting edge 41 and can be expanded to have a wide diameter corresponding to the outer surface profile of the side cutting portion 30. The upper side is formed concavely to form a storage space for the cut gum and alveolar bone.

In detail, the arc surface groove portion 34 is provided to store and discharge the cut gingiva and alveolar bone between the respective side cutting portions 30. The curved surface of the arc surface groove portion 34 connected to the upper side of the cutting guide surface 32 may be curved to the side of the side cutting edge 31 even if the stored gum or alveolar bone fills the inside of the arc surface groove portion 34 And can be guided to the fluid flow groove portion 22 side through the outer surface of the side cutting portion 30 along the curved surface without flowing.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100: Plating drilling device 1: Alveolar bone
2: Gum 3: Tooth
4: Tissue punch 6: Fixture
8: Perforation 10: Shank portion
11: mounting part 12:
20: guide body part 21: depth adjusting part
22: fluid flow groove 50: drill
30: side cutting portion 31: side cutting blade
32: cutting guide surface 34:
40: planar cutting portion 41: flat cutting edge

Claims (5)

A shank portion having an upper end formed with a mounting portion coupled to the dental handpiece;
A guide member for guiding a position where the fixture is to be inserted and inserted into a guide hole formed in the inside of the guide hole and rotatably supported by the guide member, A cylindrical guide body portion having an outer diameter corresponding to an inner circumference; And
A side cutting portion connected to a lower portion of the guide body portion and formed to be rounded as the outer surface profile extends downward to cut the gum at a position where the fixture is to be inserted and to flatten the alveolar bone at a position where the fixture is placed And a drill portion having a flat cutting portion having a flat cutting edge formed horizontally at a lower end of the side cutting portion,
Wherein the side cutting portion is formed in a convex arcuate shape with the diameter decreasing toward the lower side, the side cutting edge is formed at the end portion in the rotating direction of the side cutting portion, and the upper outer surface of the side cutting portion is rounded along the circumferential direction toward the upper side Expanded,
A concave arcuate groove portion is formed in the side opposite to the rotation direction of the side cutting portion so as to correspond to an outer profile of the side cutting portion from the flat cutting edge upwardly so as to guide the discharge of the cut alveolar bone, Is connected by a cutting guide surface, and each connecting portion is bent. delete delete The method according to claim 1,
Wherein the flat cutting portion is provided with a slide surface which is sloped upward on the side opposite to the rotation direction of the flat cutting edge,
Wherein the side cutting portion and the flat cutting portion are spaced apart from each other along the circumferential direction, and the flat cutting edge is disposed radially with respect to the rotation center point. A shank portion having an upper end formed with a mounting portion coupled to the dental handpiece;
A guide member for guiding a position where the fixture is to be inserted and inserted into a guide hole formed in the inside of the guide hole and rotatably supported by the guide member, A cylindrical guide body portion having an outer diameter corresponding to an inner circumference; And
A side cutting portion connected to a lower portion of the guide body portion and formed to be rounded as the outer surface profile extends downward to cut the gum at a position where the fixture is to be inserted and to flatten the alveolar bone at a position where the fixture is placed And a drill portion having a flat cutting portion having a flat cutting edge formed horizontally at a lower end of the side cutting portion,
A fluid guide groove is formed in a lower portion of the guide body. The fluid guide groove has a recessed round surface facing the rotation center side on the upper side, and a fluid guide surface is formed on the lower side so as to be continuous with the upper end of the side cutting portion. Wherein the plate-drilling device comprises:

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