KR20190003043A - apparatus for bone flattening drill - Google Patents

Abstract

In order to improve precision and convenience of a drilling process with respect to alveolar bone, the present invention provides a bone flattening drill device including: a shank part including a mounting part, which is coupled to a dental handpiece, formed on an upper end portion thereof; a cylindrical guide body part connected to a lower side of the shank part to be integrally rotated and rotated while being supported to a guide hole of a surgical guide fixed to the inside of the oral cavity so that an implant position of a fixture is guided; a wedge type point bit part downwardly protruding from a lower end central portion of the guide body part and provided to have a cutting area with a first diameter that has been preset to less than the diameter of the fixture; a flattening cutting part formed to be stepped with respect to a front end portion of the point bit part along the lower end portion of the guide body part, and having a flattening cutting blade formed on a rotation directional side end portion extended toward a radius directional outer side from the outer circumference of the point bit part so that the flattening cutting blade has a cutting area of a preset second diameter exceeding the preset first diameter; and a gum cutter part formed along a lower end edge of the guide body part and protruding to perform a cutting process along a cutting trajectory corresponding to a preset third diameter of the preset second diameter or more.

Description

Apparatus for bone flattening drill

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate drilling apparatus, and more particularly, to a plate drilling apparatus having improved precision and convenience of a drilling process for an alveolar bone.

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.

1 is a flowchart illustrating a conventional implant procedure.

As shown in FIG. 1, the conventional implant procedure includes a primary procedure (s1, s2, s3, s4) of placing a fixture in the alveolar bone and a time ) 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.

On the other hand, the alveolar bone is supported by bonding the root of the tooth, and the gum covers the outer side of the alveolar bone. Here, the alveolar bone in the oral cavity is not a flat surface but a curved or irregular inhomogeneous shape.

However, when a tooth punch or the like used in a conventional gum removal step is used to remove a gum at a position where the fixture is to be placed and form a portion where the alveolar bone is to be exposed, the gingiva is bent or the gums of the irregularities are completely removed Because of this, it is necessary to use a separate device to scrape the remaining gums or to perform an additional gum removal procedure. 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 penetration into the perforation during perforation formation slows the recovery of the alveolar bone and reduces the bonding force between the alveolar bone and the fixture, thereby reducing the completeness and stability of the artificial teeth.

Furthermore, when the multi-step drilling step is performed in a state where the exposed alveolar bone surface is not flat, an error is generated between the formed perforations and the positions of perforations designed by the initial simulation. Of course, although a separate guide member such as a surge guide having a guide hole for guiding drilling is provided, in the case where the alveolar bone is not flat, the drill end portion can not be stably mounted on the alveolar bone surface, There was a problem.

In this case, the position of the perforation in the simulation is determined by taking into consideration the shape of the remaining alveolar bone in the oral cavity, the bone mass distribution around the perforation, considering stable fixation of the fixture after placement, quick recovery,

Therefore, when the perforation can not be formed in a precisely designed position, it is possible to cause insufficient depth of fixture placement, lack of bone mass on the side of fixture, etc., side effects such as alveolar bone damage due to dental imbalance and lack of bone mass after artificial tooth bonding . ≪ / RTI >

Further, when the fixture can not be stably placed due to the error of the perforation formation, since the alveolar bone is transplanted or the alveolar bone is restored after the alveolar bone is reconstructed in order to form a new perforation, time and cost burden is inconvenient There is a problem that the medical personnel who perform the weighting and the implant operation are overburdened.

Korean Patent No. 10-0829243

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a drilling apparatus for drilling which is improved in precision and convenience.

To achieve the above object, according to 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 cylindrical guide body rotatably connected to a lower portion of the shank portion and rotated integrally with a guide hole of a surge guide fixed to the inside of the mouth so as to guide a fixture position; A wedge-shaped point bit portion projecting downward from a lower center portion of the guide body portion, the wedge point bit portion being provided to have a predetermined first diameter cutting area less than the diameter of the fixture; A point bit portion extending from the outer periphery of the point bit portion in a radially outward direction so as to have a predetermined second diameter cutting area that is formed to be stepped with the tip portion of the point bit portion along the lower end portion of the guide body portion, A flat cutting portion having a flat cutting edge at a side end portion in the rotating direction; And a gum cutter portion formed along a lower edge of the guide body portion and protruding to cut along a cutting locus corresponding to a predetermined third diameter greater than the predetermined second diameter.

Here, a recessed recessed portion recessed toward the upper side of the guide body portion is formed between the gum cutter portion and the point bit portion so as to receive the cutter, and the outer peripheral surface of the guide body portion between the planar cutter portion and the gum cutter portion It is preferable that a discharge guide groove portion which is inclined downward radially inward toward the lower side and communicates with the receiving groove portion is formed.

In this case, it is preferable that the discharge guide groove portion is formed with a discharge guide surface inclined toward the rotating direction toward the lower side along the rim surface in the direction opposite to the rotation direction, and connected to the flat cutting edge.

The gum cutter portion is connected to the outer edge surface of the receiving groove portion so as to cover the outer end of the receiving groove portion, and a round gum cutter blade is formed along the lower end portion. The gum cutter blade contacts the outer edge of the point bit portion It is preferably formed in a corresponding horizontal position.

It is preferable that the inner edge of the flat cutting portion is provided with an extended cutting edge which is stepped toward the rotating direction from the flat cutting edge and is connected to the outer edge of the point bit portion.

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

First, the wedge-shaped point bit portion projected downward from the lower center portion of the guide body supports the rotation of the planar cutting portion formed to be stepped with the distal end portion, so that the wedge point bit portion can be prevented from slipping due to body fluids or vibration.

Second, the cutting material generated by the point bit portion and the flat cutting portion is immediately discharged to the outside along the discharge guide groove portion formed on the outer circumferential surface of the guide body portion, and the remaining cutting material and the cutting material generated by the gum cutter are discharged The cutting grooves are joined to the receiving grooves communicating with the guide grooves and then discharged, so that excessive cutting pressure due to the cuttings is prevented, and the cutting force is stably maintained, so that the cutting efficiency can be further improved.

Thirdly, the gum cutter restricts the cutting area to the inside of the cutting locus of the predetermined third diameter, so that the gums are clearly cut and removed so that gums left on the sidewall of the extension hole are not generated. Therefore, Each drill device can be inserted smoothly, and the operator's convenience of operation can be improved.

Fourthly, the extended cutting edge is stepped toward the rotation direction from the flat cutting edge so that the flat cutting edge, which is suddenly expanded in diameter than the point bit portion, enters the gingival or alveolar bone, And the durability of the product can be improved.

1 is a flowchart showing a conventional implant procedure.
FIG. 2 is a perspective view of the present plate drilling apparatus according to an embodiment of the present invention; FIG.
3 is a front view of the present plate drilling apparatus in accordance with 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 bottom plan view of the present plate drilling apparatus according to an embodiment of the present invention;
FIGS. 6A and 6B are views showing the state of use of the present plate drilling apparatus according to an embodiment of the present invention; FIGS.

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. 2 is a perspective view of the present plate drilling apparatus according to an embodiment of the present invention, FIG. 3 is a front view of the present plate drilling apparatus according to an embodiment of the present invention, and FIG. FIG. 5 is a bottom view of the present plate drilling apparatus according to an embodiment of the present invention. FIGS. 6A and 6B are views showing a plate drilling apparatus according to an embodiment of the present invention, Fig.

2 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, a point bit portion 30, (40) and a gum cutter (50). In detail, the present plate drilling apparatus 100 is used in a preceding procedure of multi-step drilling to form a perforation for fixture placement in the implant procedure. In addition, the present plate drilling apparatus 100 is used to remove gums at the positions where the implants are placed in the oral cavity and to flatten the alveolar bone of the portion from which the gums have been removed.

The shank portion 10, the guide body portion 20, the point bit portion 30, the flat cutting portion 40, and the gum cutter portion 50 are formed by cutting or discharging a metal member, As shown in FIG. Of course, the point bit portion 30, the flat cutting portion 40 and the gum cutter portion 50 may be separately provided for the convenience of replacement, and may be detachably coupled to the guide body portion 20 have.

Referring to FIG. 2, 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 to be coupled with the mounting part 11 may be formed on one side thereof.

At this time, the mounting portion 11 is provided in a D-cut shape so as to be rotated integrally with the coupling portion, so that rotational force can be transmitted from the coupling portion. In addition, a locking groove 12 is formed on the lower side of the mounting portion 11 so that the shank portion 10 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 portion 10 may be formed independently of the diameter of the guide body portion 20 or the drill portion 50. It is preferable that the shank portion 10 has a diameter smaller than the diameter of the guide body portion 20 Do.

At this time, the shank portion 10 may be formed in a cylindrical shape. The shank portion 10 firmly supports the guide body portion 20, the point bit portion 30, the flat cutting portion 40 and the gum cutter portion 50 at high speed, The durability of the product can be improved by preventing rotation damage such as warping or twisting. Moreover, the shank portion 10 can prevent the accuracy of drilling from being reduced due to vibration due to rotation damage.

2 to 6B, 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 formed in the surge guide 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 auxiliary mechanism called the surge guide 9 is used.

Here, the surge arrester 9 is formed as a profile inside the oral cavity. At this time, the surge guide 9 is fixed by surrounding teeth and gums of tooth or gum of a patient who has a child or an edentulous patient, and the guide hole 9a is formed at each position where the implant is required. Preferably, the guide hole 9a is provided to be rotatably supporting various drilling devices including the main plate drilling device 100 inserted into the inside of the cylindrical hole.

Here, the guide hole 9a is coupled to the surge guide 9 so as to reduce the frictional force during rotation of the inserted drill device and to prevent the deformation during rotation so as to stably rotate the inserted drill device, May be formed in the sleeve provided. Of course, the guide hole 9a may be formed through the surge guide 9 as the case may be.

Since the guide body portion 20 is inserted into the guide hole 9a and slidably guided forward and backward and rotatably supported in the guide hole 9a, the accuracy of the gum removal procedure can be further improved have.

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 an artificial tooth has various dimensions such as 3.5 mm, 4.0 mm, 4.5 mm, and 5.0 mm. The diameter of the drill may be selected to be about 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm or the like corresponding to the diameter of the fixture used. 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 . Here, the depth adjusting units 21 may be spaced apart from each other at a predetermined interval along the rotation axis direction.

In detail, the practitioner confirms marking of the depth adjusting portion 21 in the guide body 20 inserted in the guide hole 9a, and the point bit portion 30, the flat cutting portion 40, The insertion depth of the gum cutter portion 50 can be confirmed. 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.

The point bit portion 30 is connected to the lower portion of the guide body portion 20. Here, the downward direction is understood as a direction from the shank portion 10 toward the guide body portion 20 side, and the upward direction is understood as a direction from the guide body portion 20 toward the shank portion 10 side .

At this time, the point bit portion 30 is provided in a wedge shape and a plurality of initial cutting edges 32 are disposed radially with respect to the rotation center distal end portion 31.

In detail, the point bit portion 30 is projected downward at a lower central portion of the guide body portion 20. At this time, the point bit portion 30 may be formed in a polygonal conical shape whose cross-sectional area becomes narrower from the connection portion connected to the guide body portion 20 toward the lower side. Therefore, the rotation center distal end portion 31 may be formed at the tip of the point bit portion 30. It is preferable that the tip portion of the point bit portion 30 corresponds to the lower end portion of the point bit portion 30 having a substantially narrow cross-sectional area and a sharp tip.

A plurality of cutting surfaces 30a may be formed along the circumferential direction with respect to the rotation center distal end portion 31. The initial cutting edge 32 may be formed at a corner where each cutting surface 30a is connected .

The present plateining drill apparatus 100 is characterized in that when the initial position for drilling is set, the rotation center distal end portion 31 is pointed to the gum 2 or alveolar bone 1 so as to prevent the occurrence of an error at the puncturing position The drilling operation can be performed in a contact state. Accordingly, the point bit unit 30 can stably enter the inside of the alveolar bone 1 according to the rotational force of the dental handpiece. Particularly, since the point bit unit 30 is rotated in a state where the point bit unit 30 is supported inside the gingule 2 to the alveolar bone 1, the present plateining drill apparatus 100 can perform stable planarization Work is possible.

Further, since the central position of the perforation is formed by the point bit unit 30 during the multistage drilling, which will be described later, after performing the planarizing operation, another drilling apparatus is mounted on the point bit unit 30 The drilling can be performed by inserting the drill hole into the initial hole formed by the drill hole.

It is preferable that the point bit unit 30 is provided to have a predetermined cutting area of a first diameter D1 which is less than the diameter of the fixture. Here, the cutting area of the point bit unit 30 refers to a cutting area of the point bit unit 30, which is formed by rotating an outer frame having the maximum cross-sectional area of the point bit unit 30 in the rotation axis direction with respect to the rotation center distal end 31, It is preferable to understand that the region from which the gum 2 to the alveolar bone 1 is cut. It is preferable that the predetermined first diameter D1 is a diameter of a circular trace formed by the point bit unit 30 being rotated.

In other words, the point bit unit 30 forms the initial hole of less than the diameter of the fixture, so that the present plateining drill apparatus 100 is prevented from being detached from the center of rotation due to vibration generated during the planarization operation .

The point bit portion 30 is formed by the initial cutting edge 32 in a state in which the rotation center distal end portion 31 is in point contact with the gum 2 or the alveolar bone 1, The alveolar bone 1 can be cut and enter into the inside. In addition, the flat cutting portion 40 can contact the gum 2 or the alveolar bone 1 in a state where the center of rotation is supported by the point bit portion 30, thereby performing the planarization operation stably.

The flat cutting portion 40 is formed to be stepped with the tip portion of the point bit portion 30 along the lower end portion of the guide body portion 20. In detail, the flat cutting portion 40 is connected to an outer edge of the point bit portion 30 having the predetermined first diameter D1, and the flat cutting portion 40 has a predetermined predetermined diameter D1 exceeding the preset first diameter D1. And may extend radially outward to have a cutting area of the second diameter D2.

Here, the predetermined second diameter D2 may be set to be equal to or smaller than the diameter of the guide body portion 20 corresponding to the diameter of the drill exceeding the predetermined first diameter D1, May be set to correspond to the diameter of the guide body 20. In this way, the initial hole formed by the point bit portion 30 can be formed so as to correspond to the diameter of the drill used by the flat cutting portion 40.

The plurality of flat cut portions 40 may be radially arranged at predetermined intervals along the circumferential direction with respect to the rotation center distal end portion 31. The planar cutting portion 40 is preferably formed with a flat cutting edge 41 at a side end portion in the rotation direction extending radially outward from the outer periphery of the point bit portion 30.

Here, the rotation-direction side end portion of the flat cutting portion 40 is preferably an end portion facing the rotation direction side and an end portion on the counter-clockwise direction side.

In this embodiment, the rotating direction of the main plate drilling apparatus 100 (counterclockwise arrow in FIG. 5) is illustrated as an example in the counterclockwise direction. However, as the case may be, It is possible to easily change the design by reversing the shape of each component.

The flat cutting edge 41 may be formed horizontally along the rotational direction side end of the flat cutting portion 40 and may have a predetermined first diameter D1 of the point bit portion 30. [ And can be disposed at mutually corresponding positions with the outer frame. That is, the point bit portion 30 may protrude downward from the planar cutting portion 40.

At this time, the flat cutting edge 41 may form a cutting force from the inner end 41a connected to the point bit portion 30 to the outer end side. Here, the flat cutting edge 41 may flatten the irregular alveolar bone 1 with the rotation center being supported by the point bit unit 30, and remove the gum.

Accordingly, as the alveolar bone 1 of the fixture-mounting portion is planarized by the flat cutting edge 41, the end of the drill can be stably fixed to the alveolar bone 1 when the drilling is performed in the subsequent multi- So that the precision of the perforation formation can be remarkably improved. Furthermore, since only one operation can be performed without removing gums remaining in the irregular portion of the alveolar bone 1, a separate gum removal operation is not required, so that the gum removal procedure time can be shortened.

At this time, the flat cutting portion 40 may be provided with a cutting guide surface 43 inclined upward from the flat cutting edge 41 toward the opposite end in the rotational direction. It is preferable that the cutting guide surface 43 is a surface facing the gum 2 or the alveolar bone 1 of the flat cutting portion 40 during planarization.

In detail, the flat cutting portion 40 cuts the gum 2 or the alveolar bone 1 according to the rotational force of the dental handpiece. Since the cutting guide surface 43 is inclined upward toward the opposite direction of rotation, the contact area is minimized during the planarization work so that the flat cutting edge 41 can be brought into contact with the gum 2 or the alveolar bone 1 . At this time, the cutting guide surface 43 may be set to have an inclination angle of 3 to 6 degrees from the flat cutting edge 41 toward the opposite end in the rotational direction.

As a result, the contact area of the flat cutting portion 40 during the drilling operation can be minimized to minimize frictional heat due to friction during the planarizing operation, and osteocyte necrosis of the alveolar bone or the lining of the gingival tissue due to frictional heat can be prevented . In addition, among the cuts generated by cutting the gum (2) to alveolar bone (1) by the initial cutting edge (32) and the flat cutting edge (41) Some cuttings can be received on the side of the receiving groove 52, which will be described later, via the cutting guide surface 43.

It is preferable that an extended cutting edge 43a is provided at an inner end of the planar cutting portion 40. In detail, the extended cutting edge 43a is formed to be stepped from the flat cutting edge 41 toward the rotating direction, and may be connected to the outer edge of the point bit portion 30 to form a continuous profile. At this time, the extended cutting edge 43a may be disposed substantially between the inner edge of the flat cutting edge 41 and the outer edge of the point bit portion 30. [

The extended cutting edge 43a has a cutting area corresponding to a predetermined fourth diameter D4 and the cutting area of the extended cutting edge 43a is partially cut in the cutting area of the flat cutting edge 41, Lt; / RTI >

In detail, as the inner end of the extended cutting edge 43a and the outer edge of the point bit portion 30 are connected to each other, the cutting region of the point bit portion 30 and the cutting region of the extended cutting edge 43a are substantially Can be interconnected. The outer cutting edge area of the extended cutting edge 43a may be overlapped with the cut edge area of the inner edge 41a of the flat cutting edge 41. That is, the extended cutting edge 43a is formed in such a way that the point bit portion 30 enters the inside of the gum 2 or alveolar bone 1 during planarization, And serves to connect the cutting areas of the cutting edge 41 continuously.

The extended cutting edge 43a is connected to the cutting guide surface 43 which is inclined upward toward the opposite end in the rotation direction so as to be in contact with the gingiva 2 to the alveolar bone 1 So that a planarization operation can be performed.

At this time, the extended cutting edge 43a may be disposed below the flat cutting edge 41 due to the inclination angle of the cutting guide surface 43. [ Here, the extended cutting edge 43a may be formed in the gum 2 or the alveolar bone 1 in a state where the point bit portion 30 is supported in the gum 2 or the alveolar bone 1 during planarization. It is possible to carry out a cutting process of contacting the flat cutting edge 41 and forming the extended hole by expanding the side wall of the initial hole formed by the point bit 30. Thus, the initial cutting edge 32, the extended cutting edge 43a and the flat cutting edge 41 can enter stepwise.

The planar cutting edge 41 is formed in such a manner that the extended cutting edge 43a enters the inside of the gum 2 or the alveolar bone 1 even when the diameter of the point bit portion 30 is enlarged during planarization So that the cutting efficiency can be further improved. Further, the extended cutting edge 43a is formed so that the flat cutting edge 41, which is suddenly larger in diameter than the point bit portion 30, enters the gum 2 to the alveolar bone 1, The durability of the product can be improved.

The gum cutter 50 is formed along the lower edge of the guide body 20. Here, the gum cutter 50 is protruded to cut the gum 2 along a cutting trajectory corresponding to a predetermined third diameter greater than the predetermined second diameter D2. Here, the gum cutter 50 may have a cutting trajectory that is equal to or greater than the predetermined second diameter D2 but less than the diameter of the guide body 20. In the present embodiment, the predetermined third diameter substantially corresponds to the predetermined second diameter D2.

In detail, the gum cutter portion 50 may be formed in a continuous outer profile from the outer circumferential surface of the guide body portion 20. The outer end of the gum cutter portion 50 may have a circular arc shape corresponding to the rotation direction, Profile. ≪ / RTI > The gum cutter 50 may have a lower end rounded downward and a round gum cutter blade 51 may be formed along a lower end of the gum cutter 50.

As a result, the gum cutter blade 51 is formed in a round shape so as to be in contact with the gum 2, so that the gum cutter blade 51 smoothly enters the inside of the gum 2 during the flattening operation, thereby performing the cutting process. In addition, since the outer end of the gum cutter 50 is formed in an arc-shaped profile, the sidewall of the extension hole can be formed flat after the planarization process.

That is, the flat cutting portion 40 cuts the gum 2 and the alveolar bone 1 so that the enlarged hole is formed, and the gum cutter 50 cuts the gum 2 and the gum cutter 50 such that the sidewall of the extension hole is sharp and flat. And cuts the gum 2 corresponding to the set third diameter.

Accordingly, the gum cutter 50 cuts the gum 2 so as not to generate gums left on the sidewall of the extension hole by limiting the cutting area to the inside of the cutting locus of the predetermined third diameter, Therefore, each drill unit can be inserted smoothly in the multistage drilling, which will be performed later, so that the operator's convenience of operation can be improved.

Here, the gum cutter blade 51 may be formed at a horizontal position corresponding to the outer edge of the point bit unit 30. [ At this time, the lowermost end of the gum cutter blade 51 may be arranged to correspond to a horizontal position outside the point bit unit 30. [ Therefore, the flat cutting edge 41 extending from the outer periphery of the point bit portion 30 and the gimp cutter blade 51 may be disposed at mutually corresponding horizontal positions.

The planar cutting edge 41 and the gum cutter blade 51 can be simultaneously brought into contact with the gum 2 or the alveolar bone 1 and the flattening operation of the flat cutting edge 41 can be performed, The gum 2 can be cut along the rotational locus corresponding to the third diameter.

The gum cutter 50 may include a plurality of gum cutters 50, and may be disposed alternately with the planar cutter 40 along the circumferential direction. At this time, the gum cutter 50 is provided in an amount corresponding to the number of the flat cuts 40, and may be disposed alternately with the flat cuts 40 along the circumferential direction. Accordingly, the flattening process of the flat cut part 40 and the gum cutting process of the gum cutter 50 can be repeatedly performed corresponding to the rotational force of the dental handpiece.

A cutting guide surface 51a may be formed at a lower end of the gum cutter 50. [ Here, the cutting guide surface 51a may be connected to the gum cutter blade 51, but may be inclined radially inward toward the upper side.

At this time, the gum cutter blade 51 may be provided in a blade shape having a narrow width in the circumferential direction as the blade width decreases toward the lower side. That is, the gum cutter blade 51 may be formed as a cutting blade having an appropriate thickness for stably entering the gum 2 in the cutting process by the cutting guide surface 51a. In addition, the gum 2 cut by the gum cutter blade 51 can be stably accommodated in the receiving groove 52, which will be described later, along the cutting guide surface 51a.

Meanwhile, it is preferable that the discharge guide groove portion 22 is formed on the outer circumferential surface of the guide body portion 20. The discharge guide groove portion 22 is formed with a discharge guide surface 42 inclined toward the lower side along the opposite side surface in the direction opposite to the rotation.

Specifically, the discharge guide groove 22 is formed on the outer circumferential surface of the guide body 20 between the flat cutting portion 40 and the gum cutter portion 50. The discharge guide surface 42 is formed along a side surface of the discharge guide groove 22 in a direction opposite to the rotational direction formed by being inclined radially inwardly toward the lower side. In addition, the discharge guide surface 42 may be inclined toward the lower side toward the rotation direction, and the lower end may be connected to the flat cutting edge 41.

Therefore, the discharge guide groove 22 may be formed on the rotational direction side of the flat cutting portion 40 and may be inclined downward in the rotational direction so as to correspond to the inclination angle of the discharge guide surface 42.

The discharge guide groove portion 22 may be inclined downward in the radial direction toward the rotational direction toward the lower side. The bottom edge portion of the discharge guide groove portion 22 may be connected to the stepped portion of the extended cutting edge 43a and the flat cutting edge 41.

Therefore, the cuttings of the gingiva 2 and the alveolar bone 1 cut by the initial cutting edge 32, the enlarged cutting edge 43a and the flat cutting edge 41 are separated from the cutout of the discharge guide groove 22 As shown in Fig. The cutout introduced into the inside of the discharge guide groove portion 22 has the discharge guide surface 42 and the discharge guide groove portion 22 inclined upwards in the opposite direction of rotation in correspondence with the rotational force of the dental handpiece The initial hole is expanded and discharged to the outside from the expansion hole where the flattening operation proceeds.

At this time, the discharge step portion 22a may protrude radially outward from the upper edge portion of the discharge guide groove portion 22. As a result, the cut material discharged along the discharge guide groove 22 is caught by the discharge step 22a and flows radially outward to be separated from the main plate drilling device 100.

The vertical distance between the gum cutter blade 51 and the discharge step 22a may be set to correspond to the vertical distance between the flat cutting edge 41 and the discharge step 22a. Therefore, the gimp cutter blade 51 may be arranged so that the lowermost end thereof corresponds to the height of the flat cutting edge 41.

As a result, the cuttings of the gum 2 or the alveolar bone 1 cut by the initial cutting edge 32, the enlarged cutting edge 43a and the flat cutting edge 41 are discharged to the discharge guide groove 22 So that the cutting gum 2 or the alveolar bone 1 is clogged with the cutting edges 32, 43a, 41 at the time of planarization, so that the cutting force can be prevented from being reduced .

Here, the discharge guide groove portion 22 may be formed on the outer circumferential surface of the guide body portion 20 so as to correspond to a predetermined length.

Of course, when the planarizing operation is performed by inserting the present plate drilling apparatus 100 into the guide hole 9a of the surge guide 9, the discharge guide groove 22 may be formed in the guide body 9, May be formed to have a vertical height corresponding to an interval between the lower end of the first electrode 20 and the depth adjusting portion 21. At this time, the cut material may be discharged to the outside from the extension hole through the guide hole 9a along the discharge guide groove 22.

The cuts generated by the cutting of the gingiva 2 or the alveolar bone 1 cut by the initial cutting edge 32, the enlarged cutting edge 43a and the planar cutting edge 41, And can be moved upwards along the discharge guide surface 42, which is inclined upward toward the opposite direction of rotation immediately after being cut, corresponding to the rotational force of the dental handpiece. That is, the discharge guide surface 42 serves to guide the cutting fluid, which flows into the discharge guide groove 22, to be smoothly discharged upward by the rotational force.

It is preferable that the receiving groove 52 is formed between the gum cutter 50 and the point bit 30 so as to be recessed upwardly from the lower side of the guide body 20. In detail, the receiving groove 52 may be formed in the lower portion of the guide body 20 in the lateral direction, and one side of the receiving groove 52 may communicate with the discharge guide groove 22.

The outer edge surface 52a of the receiving groove 52 may be connected to the cutting guide surface 51a and the inner edge surface 52b of the receiving groove 52 may be connected to the point bit portion 30 Can be formed with a continuous outer profile on the cutting surface 30a.

The inner circumferential surface 52b of the receiving groove 52 may be inclined toward the radially outer side toward the upper side corresponding to the inclination angle of the cutting surface 30a. The outer edge surface 52a of the receiving groove 52 may be inclined toward the inner side toward the upper side and may have an inclination angle symmetrical to the inner edge surface 52b of the receiving groove 52 .

Therefore, the gum cutter 50 may cover the outer end of the receiving groove 52 and may be connected to the outer edge surface 52a of the receiving groove 52. The gum cutter 50 covers the outer side of the receiving groove 52 so that the gum 2 cut by the gum cutter blade 51 passes through the cutting guide surface 51a, Can be stably accommodated in the inside of the housing (52).

At this time, in the receiving groove 52, cutting of the gum 2 or the alveolar bone 1, which is cut by the point bit 30, the flat cut 40 or cut by the gum cutter 50, Water can be introduced and received. That is, the receiving groove 52 is formed with the cuts generated by cutting the gum 2 by the gum cutter 50, and the gum 2, the alveolar bone 1, Some cuts that are not discharged through the discharge guide groove 22 may be introduced into the cuts generated by the flat cuts 40.

Thus, the generated cuts of the gums (2) to alveolar bone (1) can be joined and accommodated inside the receiving groove (52) so as not to interfere with the flattening operation. Even if the cut gum 2 or alveolar bone 1 fills the inside of the receiving groove 52, the receiving groove 52 communicating with the discharge guide groove 22 in accordance with the rotational force of the dental handpiece 52, The cuttings of the gums 2 to alveolar bone 1 accommodated in the inside of the receiving groove 52 may be discharged to the outside through the opening.

That is, the cuttings generated by the respective cutting blades 32, 43a, 41 are smoothly discharged to the outside from the extension hole along the discharge guide groove portion 22. In addition, the cuts generated by the gum cutter blades 51 generated by the cutting edges 32, 43a, 41 and remaining are joined and accommodated in the receiving groove 52, ) And the discharge guide surface (42).

Since the sequential discharge process of the cuts is continuously performed through the discharge guide groove 22, the discharge efficiency of the cuts can be improved, and the excessive accommodation of the cuts in the receiving recesses 52 can be prevented . That is, since the space for rotating the main plate drilling apparatus 100 is formed inside the extension hole, excessive cutting pressure can be prevented from being generated by the cutting material. Accordingly, the cutting edges 32, 43a, 41 and the gum cutter blades 51 are smoothly contacted with the inner surface of the expansion hole, so that drilling performance deterioration due to the reduction of rotational force is prevented and the cutting force is stably maintained, The cutting efficiency can be further improved.

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 these modifications fall within the scope of the present invention.

10: shank portion 20: guide body portion
22: discharge guide groove portion 30: point bit portion
40: planar cutting portion 41: flat cutting edge
42: discharge guide surface 43a: extended cutting edge
50: Gum cutter part 51: Gum cutter blade
52: receiving groove 100: seen plate drilling device

Claims (5)

A shank portion provided at an upper end thereof with a mounting portion coupled to the dental handpiece;
A cylindrical guide body rotatably connected to a lower portion of the shank portion and rotated integrally with a guide hole of a surge guide fixed to the inside of the mouth so as to guide a fixture position;
A wedge-shaped point bit portion projecting downward from a lower center portion of the guide body portion, the wedge point bit portion being provided to have a predetermined first diameter cutting area less than the diameter of the fixture;
A point bit portion extending from the outer periphery of the point bit portion in a radially outward direction so as to have a predetermined second diameter cutting area that is formed to be stepped with a tip end portion of the point bit portion along a lower end portion of the guide body portion, A flat cutting portion having a flat cutting edge at a side end portion in the rotating direction; And
And a gum cutter portion formed along a lower edge of the guide body portion and protruding to cut along a cutting locus corresponding to a predetermined third diameter greater than the predetermined second diameter. The method according to claim 1,
A recessed recessed portion recessed toward the upper side of the guide body portion is formed between the gum cutter portion and the point bit portion,
And a discharge guide groove portion formed in the outer circumferential surface of the guide body portion between the flat cutting portion and the gum cutter portion to be sloped radially inwardly toward the lower side to communicate with the receiving groove portion. 3. The method of claim 2,
Wherein the discharge guide groove portion is formed with a discharge guide surface which is inclined toward the rotating direction toward the lower side along the side edge surface in the direction opposite to the rotation direction and connected to the flat cutting edge. 3. The method of claim 2,
The gum cutter portion is connected to an outer edge surface of the receiving groove portion so as to cover an outer end of the receiving groove portion, and a round gum cutter blade is formed along the lower end portion,
Wherein the gum cutter blade is formed at a horizontal position corresponding to an outer edge of the point bit portion. The method according to claim 1,
And an enlarged cutting edge is formed at an inner end of the flat cutting portion so as to be stepped toward the rotating direction from the flat cutting edge and connected to an outer edge of the point bit portion.

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