Dental drill device

Abstract

An embodiment of the present invention provides a dental drill device comprising: a shank part coupled to a dental handpiece; a drill body part which is connected to a lower part of the shank part, rotates by the rotational force of the dental handpiece, and includes a plurality of spiral grooves arranged at equal intervals on an outer surface thereof and a plurality of lands formed between the spiral grooves, wherein alveolar bone particles generated during drilling of the alveolar bone are moved through the grooves; and a drill blade part formed at a lower part of the drill body part and configured to drill the alveolar bone when rotating, wherein the width of each of the lands is formed to be larger than or equal to 0.4 mm or smaller than or equal to 1 mm.

Description

Dental drill device

[0001] The present invention relates to a dental drill device.

[0002] Implants can not only restore a single missing tooth but also replace the function of natural teeth in partially and completely edentulous patients, improve the aesthetic aspects of dental prosthetic restorations, and furthermore, prevent implant failure by dispersing excessive stress applied to the surrounding alveolar bone tissue.

[0003] Once the implant placement site is determined, the gum tissue corresponding to the site is removed from inside the patient's oral cavity, and a perforation is formed in the exposed alveolar bone for the insertion of the implant.

[0004] Meanwhile, in the case of maxillary procedures, it is difficult to secure initial implant stability if the patient's bone quality is weak or the residual bone is low. In such situations, additional bone replenishment procedures, such as GBR (bone grafting), may be necessary to enhance implant stability.

[0005] Therefore, there is a need for a dental drill device that can effectively utilize autogenous bone generated during the procedure.

[0006] The present invention aims to solve the problems of the aforementioned prior art, and the objective of the present invention is to provide a dental drill device capable of effectively utilizing autogenous bone.

[0007] One aspect of the present invention provides a dental drill device comprising: a shank portion coupled to a dental handpiece; a drill body portion connected to the lower part of the shank portion and rotated by the rotational force of the dental handpiece, and including a plurality of spiral grooves arranged at equal intervals on the outer surface to which alveolar bone particles generated during drilling of the alveolar bone are moved, and a plurality of lands formed between the spiral grooves; and a drill blade portion formed on the lower part of the drill body portion and drilling the alveolar bone when rotated; wherein the width of the lands is formed to be 0.4 mm or more and 1 mm or less.

[0008] In one embodiment, the spiral groove may have a left-right symmetrical structure with respect to the center of the spiral groove.

[0009] In one embodiment, the spiral grooves may be formed in three or more and eight or fewer.

[0010] In one embodiment, the angle between the first normal to the spiral groove and the second normal to the land at the connecting portion connecting the spiral groove and the land may be 130˚ or more and 160˚ or less.

[0011] In one embodiment, the drill body portion has a tapered shape in which the diameter decreases toward the end, and the taper angle of the drill body portion may be 1˚ or more and 4˚ or less.

[0012] In one embodiment, the spiral groove may be composed of a curved surface or have a structure that is symmetrical with respect to the center of the spiral groove.

[0013] In one embodiment, the spiral groove may be formed as a curved surface.

[0014] In one embodiment, the spiral groove may include a plane located radially inward from the land and a pair of inclined surfaces connected to adjacent lands at both ends of the plane.

[0015] In one embodiment, the spiral groove may have a left-right symmetrical structure centered on the midpoint of the plane.

[0016] In one embodiment, a stopper may be further included that is formed between the shank portion and the drill body portion and is formed to limit the drilling depth of the drill blade portion.

[0017] In one embodiment, the ratio of the maximum diameter of the drill body to the maximum diameter of the stopper may be 0.3 or more and 1.0 or less.

[0018] In one embodiment, the angle of the spiral groove with respect to the central axis of the drill body may be 15˚ or more and 30˚ or less.

[0019] In one embodiment, the drill bit drills the alveolar bone when rotated in one direction, and the spiral groove may be formed in a direction opposite to the one direction.

[0020] In one embodiment, the ratio of the depth of the spiral groove to the radius of the drill body may be 0.05 or more and 0.2 or less.

[0021] In one embodiment, it may include an discharge prevention member protruding from the end of the spiral groove to suppress the discharge of alveolar bone particles from the spiral groove.

[0022] In one embodiment, the discharge prevention member may include a discharge prevention surface connected to the spiral groove and having a maximum inclination angle of 45° or more relative to the spiral groove.

[0023] In one embodiment, the discharge prevention member may include a discharge prevention ridge protruding upward from the upper part of the discharge prevention surface.

[0024] In one embodiment, the discharge prevention member may include a protrusion that protrudes toward the spiral groove side from the upper part of the discharge prevention surface.

[0025] According to one aspect of the present invention, since the dental drill device compresses the bone while simultaneously cutting it when rotating in one direction, the initial fixation force of the implant can be secured even without a separate bone graft.

[0026] According to one aspect of the present invention, the land width of the drill body is formed to be 0.4 mm or more and 1 mm or less, thereby preventing unintended cutting of the drill body so that a drilled hole can be formed to a planned size and heat generation due to friction can be reduced.

[0027] According to one aspect of the present invention, the ratio of the depth of the spiral groove to the radius of the drill body is formed to be 0.05 or more and 0.2 or less, thereby preventing unintended cutting of the drill body so that a drilled hole can be formed to a planned size and heat generation due to friction can be reduced.

[0028] According to one aspect of the present invention, the discharge prevention member prevents alveolar bone particles generated during the cutting process from being discharged from the end of the spiral groove and allows them to remain within the spiral groove, so that the alveolar bone particles are compressed on the inner surface of the hole inside the spiral groove and self-bond.

[0029] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0030] FIG. 1 is a perspective view of a dental drill device according to one embodiment of the present invention.

[0031] FIG. 2 is a diagram illustrating the direction of movement of the alveolar bone according to rotational or linear movement of a dental drill device according to one embodiment of the present invention.

[0032] FIG. 3 is a side view of a dental drill device according to one embodiment of the present invention, and describes the external appearance of the drill body part.

[0033] FIG. 4 is a side view of a dental drill device according to one embodiment of the present invention, explaining the diameter of the stopper and the drill body.

[0034] FIG. 5 is a side view of a dental drill device according to one embodiment of the present invention, illustrating the angle of the spiral groove.

[0035] FIG. 6 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, and explains the width of the spiral groove.

[0036] FIG. 7 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, illustrating the width of the spiral groove and the land.

[0037] FIG. 8 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, illustrating the radius of the drill body portion and the depth of the spiral groove.

[0038] FIG. 9 is a cross-sectional view of a drill body portion according to an embodiment of the present invention, illustrating the radius of curvature of a spiral groove.

[0039] FIG. 10 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, illustrating the angle between the spiral groove and the land.

[0040] FIG. 11 is a cross-sectional view of a drill body portion according to another embodiment of the present invention, illustrating a spiral groove composed of a planar shape.

[0041] FIG. 12 is a cross-sectional view in the AA' direction of FIG. 1.

[0042] FIG. 13 is a schematic diagram of a discharge prevention part of a spiral groove of a dental drill device according to another embodiment of the present invention.

[0043] The present invention will be described below with reference to the attached drawings. However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0044] Throughout the specification, when it is stated that a part is "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components.

[0045] Terms including ordinal numbers such as ‘first’ or ‘second’ used herein may be used to describe various components or steps, but such components or steps should not be limited by ordinal numbers. Terms including ordinal numbers should be interpreted solely for the purpose of distinguishing one component or step from other components or steps.

[0046] In addition, the cross-sectional view shown in this specification is a drawing based on a plane perpendicular to the central axis at any point on the central axis of the drill body.

[0047] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0048] Referring to FIG. 1, a dental drill device (1) according to one embodiment of the present invention may include a shank part (10), a drill body part (20), a drill blade part (30), and a stopper (40).

[0049] The shank portion (10) is assembled to an electric or manual device such as a handpiece and is formed in a cylindrical shape having a predetermined diameter and length, and a coupling portion (11) is formed at one end to be assembled to the electric or manual device.

[0050] The shank (10) can be rotated in one direction, preferably to the right (clockwise), by means of an electric or manual mechanism.

[0051] The drill body (20) is connected to the lower part of the shank (10) and rotates by the rotational force of the dental handpiece, and includes an outer surface (21) with a tapered, conical shape whose diameter gradually narrows toward the end.

[0052] On the outer surface (21) of the drill body (20), a plurality of spiral grooves (22) formed in a direction opposite to the rotational direction of the shank (10) or drill blade (30) and a plurality of lands (23) formed between the spiral grooves may be formed. For example, when the rotational direction of the drill body (20) is to the right (clockwise), the twisting direction of the spiral grooves (22) may be formed to the left (counterclockwise).

[0053] The drill bit section (30) includes a plurality of cutting blades for drilling alveolar bone, and when rotated to the right (clockwise), alveolar bone particles are cut on the inner surface of the hole.

[0054] Multiple cutting edges may have one or more inclined and curved surfaces. Between adjacent cutting edges, a chip pocket is formed in which alveolar bone particles are stored. During cutting, another portion of the alveolar bone particles stored in the chip pocket moves toward the tip of the drill bit (30), and another portion of the alveolar bone particles moves along the spiral groove (22) connected to the drill bit (30).

[0055] The drill bit (30) includes a concave portion with a concave center. As the drill bit (30) rotates to cut the alveolar bone, a bone disk is formed within the concave portion. During the process of cutting the alveolar bone, the bone disk and some of the alveolar bone particles prevent direct contact between the rotating drill bit (30) and the maxillary sinus membrane.

[0056] The stopper (40) limits the drilling depth of the dental drill device (1) and is formed between the shank portion (10) and the drill body portion (20). Specifically, the stopper (40) is formed in conjunction with the other side of the shank portion (10) and can be formed to extend radially outward along the outer surface of the drill body portion (20).

[0057] In one embodiment, the stopper (40) may limit the drilling depth of the drill bit (30) by engaging, for example, with the catch of a surgical guide.

[0058] FIG. 2 is a diagram illustrating the direction of movement of the alveolar bone according to the rotational or linear movement of a dental drill according to one embodiment of the present invention.

[0059] Below, the burnishing function of the drill body (20) will be explained in detail with reference to FIG. 2.

[0060] Here, burnishing is a method of finishing without destroying the finished surface in principle, and refers to an operation that creates a smooth surface by plastically deforming irregularities through friction with a tool applied to the finished surface. The burnishing of this embodiment includes a process of grinding the inner surface of the hole in the alveolar bone where the implant is to be placed, and self-bonding the ground alveolar bone particles to the inner surface of the hole in the alveolar bone.

[0061] In other words, it refers to alveolar bone particles gathering and being compressed against the inner surface of the alveolar bone cavity.

[0062] In detail, as shown in FIG. 2(a), when the drill body (20) rotates to the right (clockwise), a reaction force (R) acts to the right on the alveolar bone particles (P) on the spiral groove (22).

[0063] Since the spiral groove (22) is formed in a direction opposite to the rotational direction of the drill body (20), the alveolar bone particles (P) descend downward along the spiral groove (22) when the reaction force (R) acts. In this case, the alveolar bone particles (P) are compressed against the inner surface of the hole and self-bond.

[0064] In addition, as shown in Fig. 2(b), when the drill body (20) moves in a straight line downward, a reaction force (R) acts upward on the alveolar bone particles (P) on the spiral groove (22).

[0065] Accordingly, alveolar bone particles (P) can be raised upward in the drill body (20) and filled into the spiral groove (22). When alveolar bone particles (P) are filled into the spiral groove (22) along the longitudinal direction of the drill body (20), the area that can self-bond by the drill body (20) on the inner surface of the hole of the alveolar bone is increased.

[0066] Meanwhile, when the drill body (20) moves in a straight line upward, a reaction force (R) acts downward on the alveolar bone particles (P) on the spiral groove (22).

[0067] Accordingly, the alveolar bone particles (P) can move back into the hole of the alveolar bone by descending downward in the drill body part (20). As the amount of alveolar bone particles (P) present inside the hole of the alveolar bone increases, the density of the alveolar bone particles (P) due to self-bonding increases.

[0068] Accordingly, when a dental drill device according to one embodiment of the present invention is rotated in one direction and moves linearly up and down, alveolar bone particles (P) formed by cutting on the inner surface of the alveolar bone hole rise or fall and are compressed on the inner surface of the alveolar bone hole to self-bond.

[0069] That is, a dental drill device (1) according to one embodiment of the present invention can provide a drilling function and a burnishing function simultaneously when rotated in one direction.

[0070] FIG. 3 is a side view of a dental drill device according to one embodiment of the present invention, and describes the external appearance of the drill body part.

[0071] Referring to FIG. 3, the drill body (20) may have a tapered shape in which the diameter decreases toward the end.

[0072] In one embodiment, the taper angle (θ1) of the drill body (20) may be formed to be 1˚ or more and 4˚ or less with respect to the center axis (Z) of the drill body (20).

[0073] Specifically, if the taper angle (θ1) is less than 1˚, the resistance increases when the dental drill device enters the alveolar bone, and if the taper angle (θ1) exceeds 4˚, excessive pressure may be applied to the alveolar bone. Therefore, it is preferable that the taper angle (θ1) of the drill body (20) be formed to be 1˚ or more and 4˚ or less so that the dental drill device can stably enter the alveolar bone.

[0074] FIG. 4 is a side view of a dental drill device according to one embodiment of the present invention, explaining the diameter of the stopper (40) and the drill body part (20).

[0075] Referring to FIG. 4, the ratio of the maximum diameter (d) of the drill body (20) to the maximum diameter (D) of the stopper (40), i.e., d / D, may be 0.3 or more and 1.0 or less.

[0076] More specifically, if d / D is less than 0.3, the drill body (20) becomes excessively thin relative to the stopper (40), which reduces the efficiency of the drilling operation and increases the likelihood of the drill body (20) being destroyed.

[0077] Conversely, if d / D exceeds 1.0, the diameter of the drill body (20) becomes larger than the diameter of the stopper (40), and since the force applied to the drill body (20) cannot be sufficiently distributed to the stopper (40), the function of the stopper (40) is lost, and consequently, problems such as exceeding the set drilling depth or the durability of the drill body (20) being reduced and its lifespan being shortened may occur.

[0078] Therefore, in order for the drilling operation to proceed stably, it is preferable that the ratio of the maximum diameter (d) of the drill body (20) to the maximum diameter (D) of the stopper (40), i.e., d / D, be formed to be 0.3 or more and 1.0 or less.

[0079] FIG. 5 is a side view of a dental drill device according to one embodiment of the present invention, illustrating the angle of the spiral groove.

[0080] Referring to FIG. 5, the angle (θ2) of the spiral groove (22) with respect to the central axis (Z) of the drill body (20) may be 15˚ or more and 30˚ or less.

[0081] In detail, if the angle (θ2) of the spiral groove (22) is less than 15˚, the proportion of the land (23) in contact with the alveolar bone in the drill body (20) increases excessively. As the proportion of the land (23) increases, the contact area with the alveolar bone increases, so excessive heat generation may occur.

[0082] Conversely, if the angle (θ2) of the spiral groove (22) exceeds 30˚, the movement of alveolar bone particles within the spiral groove (22) is not smooth.

[0083] Therefore, in order to facilitate the movement of alveolar bone particles and reduce heat generation due to friction, it is preferable that the angle (θ2) of the spiral groove (22) with respect to the central axis (Z) of the drill body (20) be formed to be 15˚ or more and 30˚ or less.

[0084] FIG. 6 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, and explains the width of the spiral groove.

[0085] Referring to FIG. 6, the spiral groove (22) has a structure that is symmetrical with respect to the center of the spiral groove (22).

[0086] The spiral grooves (22) can be formed in, for example, 3 or more and 8 or fewer.

[0087] Multiple spiral grooves (22) can be arranged at equal angles with respect to the central axis (Z) and adjacent spiral grooves (22). That is, multiple spiral grooves (22) are arranged at equal intervals on the outer surface of the drill body (20).

[0088] In addition, as the spiral grooves (22) are arranged at equal intervals, a plurality of lands (23) formed between the spiral grooves (22) are also arranged at equal intervals.

[0089] FIG. 7 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, illustrating the width of the spiral groove and the land.

[0090] Referring to FIG. 7, the width of the land (23) of the drill body (20) can be formed to be 0.4 mm or more and 1 mm or less.

[0091] In detail, if the land width (a1) is formed to be less than 0.4 mm, the end of the land (23) may be steeply inclined, causing unintended cutting in the drill body (20), and as a result, the drilled hole may become larger than the planned size.

[0092] On the other hand, if the land width (a1) is formed to exceed 1 mm, the contact area between the drill body (20) and the alveolar bone increases, and heat is generated due to friction.

[0093] Accordingly, in order to prevent the cutting function of the drill body (20) and reduce heat generation due to friction, it is preferable that the land width (a1) of the drill body (20) be formed to be 0.4 mm or more and 1 mm or less.

[0094] Preferably, the ratio of the spiral groove width (b1) to the land width (a1), i.e., b1 / a1, is formed to be 1.0 or more and 1.5 or less.

[0095] In one embodiment, the ratio of the spiral groove width (b1) to the land width (a1) may be formed uniformly along the central axis of the drill body (20). However, this is not limited thereto, and the ratio of the spiral groove width (b1) to the land width (a1) may change regularly or irregularly along the central axis of the drill body (20).

[0096] FIG. 8 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, explaining the radius of the drill body portion and the depth of the spiral groove.

[0097] Referring to FIG. 8, the ratio of the depth (b2) of the spiral groove to the radius (a2) of the drill body (20), i.e., b2 / a2, may be 0.05 or more and 0.2 or less.

[0098] For reference, the radius (a2) of the drill body (20) is the length from the central axis (Z) of the drill body (20) to the apex of the land (23), and the depth (b2) of the spiral groove (22) is the length from the apex of the land (23) to the trough of the spiral groove (22). In other words, the depth (b2) of the spiral groove (22) indicates the degree of depression relative to the land (23).

[0099] More specifically, if b2 / a2 is less than 0.05, the end of the land (23) is steeply inclined, and unintended cutting may occur in the drill body (20).

[0100] Conversely, if b2 / a2 exceeds 0.2, the contact area between the drill body (20) and the alveolar bone increases, and heat is generated due to friction.

[0101] Accordingly, in order to prevent the cutting function of the drill body (20) and reduce heat generation due to friction, it is preferable that the ratio of the depth (b2) of the spiral groove (22) to the radius (a2) of the drill body (20), i.e., b2 / a2, be formed to be 0.05 or more and 0.2 or less.

[0102] In one embodiment, the ratio of the depth (b2) of the spiral groove (22) to the radius (a2) of the drill body (20) may be formed uniformly along the central axis of the drill body (20). However, this is not limited thereto, and the ratio of the depth (b2) of the spiral groove (22) to the radius (a2) of the drill body (20) may change regularly or irregularly along the central axis of the drill body (20).

[0103] FIG. 9 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, and explains the radius of curvature of a spiral groove.

[0104] Referring to FIG. 9, the spiral groove (22) may be formed as a curved surface, and the radius of curvature (R) of the curved surface may be 0.5 mm or more and 1.5 mm or less.

[0105] If the radius of curvature (R) of the spiral groove (22) is less than 0.5 mm, the width of the spiral groove (22) becomes excessively narrow based on the same depth, so the movement of alveolar bone particles is not smooth.

[0106] Conversely, if the radius of curvature (R) of the spiral groove (22) exceeds 1.5 mm, the width of the spiral groove (22) becomes excessively long based on the same depth, and the pressure applied to the alveolar bone particles decreases, thereby weakening the burnishing function.

[0107] Therefore, in order to facilitate the movement of alveolar bone particles and to transmit appropriate pressure to the alveolar bone particles, it is preferable that the radius of curvature (R) of the spiral groove (22) be formed to be 0.5 mm or more and 1.5 mm or less.

[0108] In one embodiment, the radius of curvature (R) of the spiral groove (22) may be formed uniformly along the central axis of the drill body (20). However, it is not limited thereto, and the radius of curvature (R) of the spiral groove (22) may change regularly or irregularly along the central axis of the drill body (20).

[0109] FIG. 10 is a cross-sectional view of a drill body portion according to one embodiment of the present invention, illustrating the angle between the spiral groove and the land.

[0110] Referring to FIG. 10, the angle (θ3) between the first normal (X1) to the spiral groove (22) and the second normal (X2) to the land (23) in the connecting part (24) connecting the spiral groove (22) and the land (23) may be 130˚ or more and 160˚ or less.

[0111] In detail, if the angle (θ3) between the first normal (X1) and the second normal (X2) is less than 130˚, the connecting part (24) is steeply inclined, and unintended cutting may occur in the drill body part (20), and as a result, the drilled hole may become larger than the planned size.

[0112] If the angle (θ3) between the first normal (X1) and the second normal (X2) exceeds 160˚, the space of the spiral groove (22) becomes narrow, and the movement of alveolar bone particles is not smooth.

[0113] Therefore, in order to prevent the cutting function of the drill body (20) and to facilitate the movement of alveolar bone particles, it is preferable that the angle (θ3) between the first normal (X1) and the second normal (X2) be formed to be 130˚ or more and 160˚ or less.

[0114] In one embodiment, the angle (θ3) between the first normal (X1) and the second normal (X2) may be formed consistently along the central axis of the drill body (20). However, this is not limited thereto, and the angle (θ3) between the first normal (X1) and the second normal (X2) may change regularly or irregularly along the central axis of the drill body (20).

[0115] FIG. 11 is a cross-sectional view of a drill body portion according to another embodiment of the present invention, illustrating a spiral groove composed of a planar shape.

[0116] Parts that overlap with the aforementioned embodiments are omitted, identical or similar components are assigned identical or similar reference numerals, and detailed descriptions thereof are omitted.

[0117] Referring to FIG. 11, the spiral groove can be composed of a plurality of planes.

[0118] In a cross-section of the drill body (120), a plane (122a) and a pair of inclined surfaces (122b) connected to adjacent lands (123) at both ends of the plane (122a) may be included. The plane (122a) is located radially inward from the lands (123).

[0119] A pair of inclined surfaces (122b) can be formed symmetrically on the left and right sides with respect to the center of the plane (122a).

[0120] FIG. 12 is a cross-sectional view in the AA' direction of FIG. 1.

[0121] Specifically, FIG. 12 is a cross-sectional view taken along the direction of formation of the spiral groove, showing the structure of the end of the spiral groove.

[0122] Referring to FIG. 12, the spiral groove (22) gradually decreases in depth at the end of the shank portion and eventually forms a height equal to the outer surface (21) of the drill body portion (20).

[0123] However, in this case, since the cut alveolar bone particles can be discharged out of the spiral groove (22) along the spiral groove (22), the compressive force applied to the alveolar bone particles is reduced, and the amount of self-bonding to the inner surface of the alveolar bone hole is reduced. In other words, the burnishing function of the dental drill device is weakened.

[0124] Accordingly, a dental drill device according to another embodiment of the present invention is characterized by including an ejection prevention part that suppresses the ejection of alveolar bone particles.

[0125] FIG. 13 is a schematic diagram of a discharge prevention part of a spiral groove of a dental drill device according to another embodiment of the present invention.

[0126] Hereinafter, a dental drill device according to another embodiment is described with reference to FIG. 13. Parts overlapping with the previously described embodiment are omitted, identical or similar components are given identical or similar reference numerals, and detailed descriptions thereof are omitted.

[0127] In detail, at the end of the spiral groove (222) of a dental drill device according to another embodiment, an ejection prevention part (250) is formed that is higher than the height of the spiral groove (222). The height of the ejection prevention part (250) may be equal to the height of the outer surface of the drill body part (220) or may be formed to exceed the height of the outer surface. In this case, when the ejection prevention part (250) is formed to exceed the height of the outer surface of the drill body part (220), the ejection prevention part (250) may be formed not only on the drill body part (220) but also on the stopper (40).

[0128] The discharge prevention member (250) is connected to the spiral groove (222) and includes a discharge prevention surface having a maximum inclination angle of 45˚ or more relative to the spiral groove (222). In one embodiment, the maximum inclination angle of the discharge prevention surface may be 90˚ or more.

[0129] In detail, as shown in FIG. 13 (a), the discharge prevention member (250) may include a discharge prevention surface (251a) formed as a quarter-circle shaped round surface. Since the angle of inclination on one side of the discharge prevention surface (251a) is 0˚ but the other side of the discharge prevention surface (251a) is formed at approximately 90˚, the discharge of alveolar bone particles can be suppressed.

[0130] As shown in FIG. 13(b), the discharge prevention member (250) may additionally include a discharge prevention ridge (252) that protrudes from the upper part of the discharge prevention surface (251a) toward the upper side of the drill body member (220). The discharge prevention ridge (252) increases the height of the discharge prevention member (250) and serves to prevent alveolar bone particles from being discharged through the spiral groove (222).

[0131] As shown in (c) of FIG. 13, the discharge prevention part (250) may include a discharge prevention surface (251b) perpendicular to the spiral groove (222).

[0132] As shown in (d) of FIG. 13, the discharge prevention part (250) may additionally include a protrusion (253) that protrudes toward the spiral groove (222) from the upper part of the discharge prevention surface (251a).

[0133] That is, the discharge prevention part (250) prevents alveolar bone particles generated during the cutting process from being discharged from the end of the spiral groove (222) and allows them to remain within the spiral groove (222), so that the alveolar bone particles are compressed on the inner surface of the hole inside the spiral groove and self-bond.

[0134] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0135] The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0136]

[0137] [Explanation of the symbol]

[0138] 1 Dental drill device

[0139] 10 Sanctuary

[0140] 20 drill body

[0141] 30 drill bits

[0142] 40 Stopper section

Claims

1. A shank portion that connects to a dental handpiece; A drill body portion connected to the lower part of the shank portion and rotated by the rotational force of the dental handpiece, comprising a plurality of spiral grooves arranged at equal intervals on the outer surface where alveolar bone particles generated during drilling of the alveolar bone are moved, and a plurality of lands formed between the spiral grooves; and A drill bit portion formed at the lower part of the above-mentioned drill body portion and drilling the alveolar bone when rotated; comprising A dental drill device in which the width of the land is formed to be 0.4 mm or more and 1 mm or less.

2. In Paragraph 1, In the connection portion connecting the spiral groove and the land, the first normal to the spiral groove and, A dental drill device in which the angle between the second normal to the land at the above connection part is 130˚ or more and 160˚ or less.

3. In Paragraph 1, The above drill body has a tapered shape in which the diameter decreases toward the end, and A dental drill device having a taper angle of 1˚ or more and 4˚ or less for the drill body portion.

4. In Paragraph 1, A dental drill device in which the spiral groove is composed of a curved surface or has a structure that is symmetrical with respect to the center of the spiral groove.

5. In Paragraph 1, A dental drill device comprising a spiral groove including a plane located radially inward from the land and a pair of inclined planes connecting to adjacent lands at both ends of the plane.

6. In Paragraph 5, A dental drill device having a spiral groove having a left-right symmetrical structure with respect to the midpoint of the plane in the cross-section of the drill body portion.

7. In Paragraph 1, A dental drill device further comprising a stopper formed between the shank portion and the drill body portion and formed to limit the drilling depth of the drill blade portion.

8. In Paragraph 7, A dental drill device in which the ratio of the maximum diameter of the drill body to the maximum diameter of the stopper is 0.3 or more and 1.0 or less.

9. In Paragraph 1, A dental drill device having an angle of the spiral groove with respect to the central axis of the drill body portion of 15˚ or more and 30˚ or less.

10. In Paragraph 1, The above drill bit drills the alveolar bone when rotating in one direction, and A dental drill device in which the spiral groove is formed in a direction opposite to the one direction.

11. In Paragraph 1, A dental drill device in which the ratio of the depth of the spiral groove to the radius of the drill body is 0.05 or more and 0.2 or less.

12. In Paragraph 1, A dental drill device comprising a discharge prevention member formed protruding from the end of the spiral groove to suppress the discharge of alveolar bone particles from the spiral groove.

13. In Paragraph 12, A dental drill device comprising a discharge prevention member connected to the spiral groove and including a discharge prevention surface having a maximum inclination angle of 45° or more with respect to the spiral groove.

14. In Paragraph 13, A dental drill device comprising a discharge prevention member, wherein the discharge prevention member includes a discharge prevention projection protruding upward from the upper portion of the discharge prevention surface.

15. In Paragraph 13, A dental drill device comprising a discharge prevention member, wherein the discharge prevention member includes a protrusion that protrudes toward a spiral groove from the upper part of the discharge prevention surface.

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