WO2009057887A1

WO2009057887A1 - Dental instrument for cutting bone

Info

Publication number: WO2009057887A1
Application number: PCT/KR2008/004933
Authority: WO
Inventors: Kwang Bum Park; Kyoung Ho Ryoo
Original assignee: Megagen Implant Co., Ltd.
Priority date: 2007-11-01
Filing date: 2008-08-22
Publication date: 2009-05-07
Also published as: KR20090044765A; KR100923275B1

Abstract

Provided is a dental bone-cutting instrument for cutting a protruding bone remaining in a hole after drilling of the hole in an alveolar bone. The dental bone-cutting instrument includes a body comprising at least one slit formed along a longitudinal direction of the body, a clamping portion extending from the body and holding the protruding bone as a gap of the at least one slit is narrowed, and a slit tightening portion coupled to the body and narrowing the gap of the at least one slit by pressing the body to cause the clamping portion to hold the protruding bone. By using the dental bone-cutting instrument, the protruding bone remaining in the hole after drilling of the hole in the alveolar bone can be stably cut by simple manipulation without applying an excessive force to the protruding bone.

Description

DENTAL INSTRUMENT FOR CUTTING BONE

Technical Field

[1] The present invention generally relates to a dental instrument for cutting a bone, and more particularly, to a dental bone-cutting instrument for cutting a protruding bone remaining in a hole after drilling of the hole in an alveolar bone. Background Art

[2] An implant surgical method originally means a substitute for restoring a missed tissue of a human body, but in dentistry, it means a process of implanting an artificial tooth root. The implant surgical method is an up-to-date surgical method which implants an artificial tooth root made of titanium having no rejection by human body into an alveolar bone from which a tooth has been extracted in order to replace a root of the missed tooth and then fixes an artificial tooth into the tooth root in order to restore the function of the missed tooth. A general prosthesis or denture damages neighboring teeth and bones over time, whereas an implant does not damage neighboring teeth tissues and has the same function or shape as a natural tooth while preventing teeth from decaying. For this reason, the implant may be semi-permanently used.

[3] In order to complete an implant operation, an insertion position is drilled using a predetermined drill, an implant is inserted into an alveolar bone to merge the implant into the alveolar bone, and an abutment is combined with the implant and covered with a prosthesis.

[4] An alveolar bone of a patient is drilled using a drill or the like, and then an implant is inserted into the alveolar bone. Thus, the work of drilling the alveolar bone is very important.

[5] During a process of drilling a hole in the alveolar bone of the patient by using a drill and the like, the hole may not be clean drilled in the alveolar bone and thus a protruding bone may remain in the hole. This phenomenon particularly occurs in a drilling work which uses a midair drill.

[6] The protruding bone remaining in the hole drilled in the alveolar bone disturbs successful insertion of an implant. Therefore, the protruding bone should be removed by cutting prior to insertion of the implant into the alveolar bone.

[7] Conventionally, in order to remove the protruding bone remaining in the hole of the alveolar bone, an operator directly cuts the protruding bone by using his finger or an instrument such as a pincette or performs an additional drilling work.

[8] However, according to the conventional method using a finger or an instrument such as a pincette, the alveolar bone may be damaged due to an excessive force applied during cutting of the protruding bone and it is difficult to clean and stably cut the protruding bone. Moreover, according to the conventional method using an additional drilling work, the additional drilling work increases an operation time and causes inconvenience of patients. Disclosure of Invention Technical Problem [9] The present invention provides a dental bone-cutting instrument by which a protruding bone remaining in a hole after drilling of the hole in an alveolar bone can be stably cut by simple manipulation without applying an excessive force to the protruding hole.

Advantageous Effects

[10] According to the present invention, by forming at least one slit along a longitudinal direction of a body and providing a slit tightening portion for narrowing a gap of the at least one slit formed in the body to cause a clamping portion to hold a protruding bone, the protruding bone remaining in the hole after drilling of the hole in the alveolar bone can be stably cut through simple manipulation without applying an excessive force to the protruding bone. Brief Description of Drawings

[11] FIG. 1 is a schematic diagram of a dental bone-cutting instrument according to a first embodiment of the present invention;

[12] FIG. 2 is a schematic diagram of the dental bone-cutting instrument illustrated in

FIG. 1, which is viewed from another direction;

[13] FIGS. 3 and 4 are diagrams for describing a process of cutting a protruding bone remaining in a hole drilled in an alveolar bone by using the dental bone-cutting instrument illustrated in FIG. 1 ;

[14] FIG. 5 is a schematic diagram of a dental bone-cutting instrument according to a second embodiment of the present invention; and

[15] FIGS. 6 and 7 are diagrams of a dental bone-cutting instrument according to a third embodiment of the present invention. Best Mode for Carrying out the Invention

[16] According to an aspect of the present invention, there is provided a dental bone- cutting instrument for cutting a protruding bone remaining in a hole after drilling of the hole in an alveolar bone. The dental bone-cutting instrument includes a body comprising at least one slit formed along a longitudinal direction of the body, a clamping portion extending from the body and holding the protruding bone as a gap of the at least one slit is narrowed, and a slit tightening portion coupled to the body and narrowing the gap of the at least one slit by pressing the body to cause the clamping portion to hold the protruding bone. [17] The body may include a tapered region whose diameter progressively increases toward a lower portion of the body, and the slit tightening portion may be a tightening sleeve which is coupled to the tapered region to move upwardly and downwardly and narrows the gap of the at least one slit by pressing the body in a radial direction when moving downwardly. [18] The tightening sleeve may be coupled to the tapered region to move with respect to the body in a sliding manner. [19] The tightening sleeve may be screw-coupled to the tapered region to move upwardly and downwardly with respect to the body by being rotated. [20] The slit tightening portion may include a tightening member coupled to the body along a circumference of the body and whose both ends are disposed in a side of the body and a tightening cam rotatably coupled to the both ends of the tightening member with contacting the side of the body, and pressing the body in the radial direction and releasing the pressing of the body by the rotation of the a tightening cam. [21] The body may be provided with at least one discharge hole for discharging the protruding bone which is cut and temporarily received in the body. [22] The dental bone-cutting instrument may further include a handle coupled to an upper portion of the body, wherein a force required for cutting the protruding bone is applied to the handle.

[23] The handle may have an angular shape.

[24] The handle may extend from the upper portion of the body to be formed as one piece with the body. [25] The handle may be coupled to the upper portion of the body in a forced insertion manner or a screw-coupling manner. [26] The clamping portion may include a pair of clamping pieces extending downwardly from a lower portion of the body and being spaced apart from each other. [27] The clamping portion may have an inner side contacting the protruding bone, which is processed to be rougher than an outer side of the clamping portion. [28] An inner side of a lower portion of the clamping portion may be provided with an edge protruding inwardly to facilitate cutting of the protruding bone.

Mode for the Invention [29] A dental bone-cutting instrument according to the present invention is a dental instrument used in an implant operation to cut a protruding bone remaining in a hole after the hole is drilled in an alveolar bone by using a drill to insert an implant into the alveolar bone. [30] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 through 4.

[31] FIG. 1 is a schematic diagram of a dental bone-cutting instrument according to a first embodiment of the present invention, FIG. 2 is a schematic diagram of the dental bone- cutting instrument illustrated in FIG. 1, which is viewed from another direction, and FIGS. 3 and 4 are diagrams for describing a process of cutting a protruding bone remaining in a hole drilled in an alveolar bone by using the dental bone-cutting instrument illustrated in FIG. 1.

[32] Referring to FIG. 1, the dental bone-cutting instrument 100 according to the current embodiment of the present invention includes a body 110 having a pair of slits 112 formed along its longitudinal direction, a clamping portion 120 which extends from the body 110 to hold a protruding bone to be cut as a gap of the slits 112 is narrowed, a tightening sleeve 130 as a slit tightening portion which is coupled to the body 110 and narrows the gap of the slits 112 by pressing the body 110 to cause the clamping portion 120 to hold the protruding bone, and a handle 140 coupled to an upper portion of the body 110.

[33] Referring to FIGS. 1 and 2, the body 110 of the dental bone-cutting instrument 100 has a hollow cylindrical shape including a tapered region 114 whose diameter progressively increases toward a lower portion of the body 110. In the body 110, the slits 112 are formed along the longitudinal direction of the body 110. In FIG. 1, the slits 112 are formed along the central axis of the body 110 at the front and the rear, respectively. In other words, the two slits 112 are formed along the longitudinal direction of the body 110 and the body 110 is divided by the slits 112 into 2 portions, a left portion and a right portion. However, in the present invention, one slit or three or more slits may be provided in the body 110.

[34] As illustrated in FIG. 1, the slits 112 start from an upper portion of the body 110 and ends at a lower portion of the body 110. In other words, upper portions of the slits 112 are closed from an external environment, whereas lower portions of the slits 112 are opened to the external environment. The gap of the slits 112 is preferably selected in a range of 0.1 - 5 mm.

[35] However, the body 110 according to the present invention is not limited to a shape illustrated in FIG. 1 and may have various shapes as long as the gap of the slits 112 formed along the longitudinal direction of the body 110 can be narrowed by pres- surization of the body 110 in a radial direction.

[36] Referring to FIG. 2, the body 110 is provided with two discharge holes 116 for easily discharging the protruding bone that is cut and temporarily received in the body 110. However, one discharge hole 116 or three or more discharge holes 116 may be provided in the body 110. [37] Referring to FIG. 1, the clamping portion 120 includes a pair of clamp pieces 122 which extend downwardly from the lower portion of the body 110 and hold a bone to be cut as the gap of the slits 112 is narrowed. The pair of clamp pieces 122 extend downwardly from the left portion and the right portion of the body 110 divided by the slits 112, respectively, and are spaced apart from each other.

[38] The pair of clamp pieces 122, because of extending from the left portion and the right portion of the body 110, respectively, move inwardly as the gap of the slits 112 formed in the body 110 is narrowed. In other words, the pair of clamp pieces 122 spaced apart from each other are bent inwardly to approach each other as the gap of the slits 112 formed in the body 110 is narrowed. In this way, in the dental bone-cutting instrument 100, the gap of the slits 112 formed in the body 110 is narrowed such that a bone to be cut can be clamped by the pair of clamp pieces 122.

[39] An inner side of a lower portion of each of the clamp pieces 122 is provided with an edge 124 protruding inwardly to facilitate cutting of a protruding bone.

[40] For stable clamping of a bone to be cut, an inner side of each of the clamp pieces 122 is processed to be rougher than an outer side of the clamp piece 122. In other words, the inner side of the clamp piece 122 is processed rough such that a friction force against a contacting bone increases, thereby allowing stable clamping.

[41] Referring to FIG. 1, the tightening sleeve 130 is a slit tightening portion which presses the body 110 in the radial direction to narrow the gap of the slits 112. The tightening sleeve 130 is coupled to the tapered region 114 of the body 110 in such a way to slide up and down. An inner circumferential surface of the tightening sleeve 130 has a tapered shape corresponding to the tapered region 114 of the body 110. In other words, an inner diameter of the tightening sleeve 130 progressively increases toward a lower portion of the tightening sleeve 130. However, unlike in the current embodiment of the present invention, the tightening sleeve 130 according to the present invention may have a uniform diameter as long as it can press the body 110 in the radial direction. The present invention may also be configured such that the tapered region 114 of the body 110 is omitted and only the inner circumferential surface of the tightening sleeve 130 is tapered.

[42] The tightening sleeve 130, as moving downwardly with respect to the body 110, presses the body 110 in the radial direction to narrow the gap of the slits 112 formed in the body 110, as will be described in detail below.

[43] Referring to FIG. 1, the handle 140 is a member to which a force required for cutting a bone is applied when the clamping portion 120 holds the bone remaining in a hole of an alveolar bone. The handle 140 is coupled to the upper portion of the body 110 in a forced insertion manner. However, various coupling methods such as screw-coupling may be used for the handle 140 without being limited to the above example. The handle 140 may also extend from the upper portion of the body 110 to be formed as one piece with the body 110.

[44] When the clamping portion 120 holds a bone to be cut, an operator grips the handle

140 by using fingers or a separate instrument and rotates and twists the bone or bends the bone to a side in order to cut the bone. In other words, the operator applies torsion moment or bending moment to a bone remaining in a hole of an alveolar bone by means of the handle 140, thereby cutting the bone. It is preferable that the handle 140 has an angular shape to apply a force required for the operator to stably and easily cut the bone. In the current embodiment of the present invention, the handle 140 has a 4-angular shape.

[45] With reference to FIGS. 3 and 4, a description will be made regarding a process of cutting a protruding bone Ia remaining in a hole 2 drilled in an alveolar bone 1 by using the dental bone-cutting instrument 100 according to the current embodiment of the present invention.

[46] As illustrated in FIG. 3, an operator inserts the dental bone-cutting instrument 100 into the hole 2 drilled in the alveolar bone 1 such that the protruding bone Ia is disposed in an inner side of the clamping portion 120. At this point, the clamping portion 120, although being adjacent to the protruding bone Ia, is not clamping the protruding bone Ia.

[47] Next, as illustrated in FIG. 4, the operator moves downwardly the tightening sleeve

130 coupled to the tapered region 114 of the body 110. When the tightening sleeve 130 is in a position illustrated in FIG. 4 by downward movement, the body 110 is pressed in the radial direction by the tightening sleeve 130 and thus the gap of the slits 112 formed in the body 110 is narrowed. In other words, since the diameter of the tapered region 114 of the body 110 progressively increases toward the lower portion of the body 110, the inner diameter of the tightening sleeve 130 moved downwardly is smaller than the outer diameter of the body 110, whereby the tightening sleeve 130 tightens the body 110 in the radial direction and thus narrows the gap of the slits 112 formed along the longitudinal direction of the body 110. As the gap of the slits 112 is narrowed, the clamping portion 120 including the pair of clamp pieces 122 extending downwardly from the lower portion of the body 110 moves inwardly to firmly clamp the protruding bone Ia as illustrated in FIG. 4.

[48] When the protruding bone Ia is clamped by the clamping portion 120, the operator grips the handle 140 by using fingers or a separate instrument and twists the protruding bone Ia by rotation in one direction or bends the protruding bone Ia to a side in order t

0 cut the protruding bone Ia. In other words, the operator applies torsion moment or bending moment to the protruding bone Ia remaining in the hole 2 of the alveolar bone

1 by means of the handle 140, thereby cutting the protruding bone Ia. The cut protruding bone Ia is temporarily received in the body 110 and/or the clamping portion 120, and the operator discharges cut the protruding bone Ia through the discharge holes 116 formed in the body 110, thereby completing the process of cutting the protruding bone Ia remaining in the hole 2 of the alveolar bone 1.

[49] As such, the dental bone-cutting instrument 100 according to the present invention includes the slits 112 formed in the body 110 along the longitudinal direction of the body 110 and the slit tightening portion which tightens the gap of the slits 112 formed in the body 110 to cause the clamping portion 120 to hold the protruding bone, thereby allowing the operator to stably cut the protruding bone remaining in the hole after drilling of the hole in the alveolar bone through simple manipulation without applying an excessive force to the protruding bone.

[50] With reference to FIG. 5, a description will now be made of another embodiment of the present invention.

[51] FIG. 5 is a schematic diagram of a dental bone-cutting instrument 200 according to a second embodiment of the present invention, in which like members are designed by the same reference numerals used in the first embodiment. The following description will be focused on differences than the first embodiment.

[52] Referring to FIG. 5, the dental bone-cutting instrument 200 according to the current embodiment of the present invention includes a body 110 having the slits 112 formed along the longitudinal direction of the body 110, the clamping portion 120 which extends from the body 110 to hold a protruding bone to be cut as the gap of the slit 112 is narrowed, a tightening sleeve 230 as a slit tightening portion which is screw-coupled to the body 110 and narrows the gap of the slits 112 by pressing the body 110 to cause the clamping portion 120 to hold the protruding bone, and the handle 140 coupled to an upper portion of the body 110.

[53] The dental bone-cutting instrument 200 according to the current embodiment of the present invention is substantially the same as the dental bone-cutting instrument 100 illustrated in FIG. 1 except for a coupling structure between the tightening sleeve 230 and the tapered region 114 of the body 110 and a manner in which the tightening sleeve 230 moves with respect to the body 110.

[54] Referring to FIG. 5, in the current embodiment of the present invention, the tightening sleeve 230 is screw-coupled to the tapered region 114 of the body 110 such that the tightening sleeve 230 moves upwardly and downwardly with respect to the body 110 by being rotated. To this end, an outer circumferential surface of the tapered region 114 of the body 110 is provided with a male screw 118 and an inner circumferential surface of the tightening sleeve 230 is provided with a female screw 232 corresponding to the male screw 118 formed on the outer circumferential surface of the tapered region 114. [55] In the dental bone-cutting instrument 200 having such a coupling structure between the tightening sleeve 230 and the tapered region 114, the tightening sleeve 230 is rotated in one direction to move downwardly with respect to the body 110. Thus, the dental bone-cutting instrument 200 prevents an excessive force from being applied during a process of moving the tightening sleeve 230 downwardly to narrow the gap of the slits 112 formed in the body 110, thereby allowing stable cutting. Moreover, in the dental bone-cutting instrument 200, since the tightening sleeve 230 progressively moves downwardly as being rotated, the gap of the slits 112 can be easily adjusted to fit a thickness of a bone to be cut.

[56] Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7.

[57] FIGS. 6 and 7 are diagrams of a dental bone-cutting instrument 300 according to a third embodiment of the present invention, in which like members are designed by the same reference numerals used in the first and second embodiments. The following description will be focused on differences than the first and second embodiments.

[58] Referring to FIGS. 6 and 7, the dental bone-cutting instrument 300 according to the current embodiment of the present invention includes a body 110 having the slits 112 formed along the longitudinal direction of the body 110, the clamping portion 120 which extends from the body 110 to hold a protruding bone to be cut as an gap of the slit 112 is narrowed, a slit tightening portion 330 which is screw-coupled to the body 110 and narrows the gap of the slits 112 by pressing the body 110 to cause the clamping portion 120 to hold the protruding bone, and the handle 140 coupled to an upper portion of the body 110.

[59] The dental bone-cutting instrument 300 according to the current embodiment of the present invention uses the slit tightening portion 330 of a cam type as a component for narrowing the gap of the slits 112 by pressing the body 110 unlike in the first and second embodiments which use the tightening sleeves 130 and 230 that are coupled to the tapered region 114 of the body 110 to move upwardly and downwardly. Since the slit tightening portion 330 is of a cam type in the current embodiment of the present invention, the body 110 does not need to include the tapered region 114 unlike in the first and second embodiments.

[60] Referring to FIGS. 6 and 7, in the current embodiment of the present invention, the slit tightening portion 330 includes a tightening member 332 which is coupled to the body 110 along the circumference of the body 110 and both ends of which are disposed in a side of the body 110, and a tightening cam 334 which is rotatably coupled to the both ends of the tightening member 332.

[61] The tightening member 332 has a belt shape which surrounds the body 110 in a cylindrical shape, and is disposed along the circumference of the body 110 to contact the outer circumferential surface of the body 110. The both ends of the tightening member 332 are disposed in a side of the body 110 such that they are spaced apart from each other.

[62] The tightening cam 334 is disposed between the both ends of the tightening member

332 and is coupled to the both ends of the tightening member 334 with contacting the side of the body 110 such that it can rotate along a rotation shaft 336.

[63] The tightening cam 334 has such a shape that it can press the body 110 in the radial direction and release the pressing of the body 110. More specifically, a portion of the tightening cam 334 which contacts the side of the body 110 is referred to as a 'pressing- released contact portion 334a' in FIG. 6 where the pressing of the body 110 is released, and a portion of the tightening cam 334 which contacts the side of the body 110 is referred to as a 'pressing contact portion 334b' in FIG. 7 where the body 110 is pressed. In this case, the tightening cam 334 is shaped such that a distance from the rotation shaft 336 to the pressing contact portion 334b is longer than a distance from the rotation shaft 336 to the pressing-released contact portion 334a.

[64] The dental bone-cutting instrument 300 structured as described above rotates the tightening cam 334 in a pressing-released state as illustrated in FIG. 6 by about 90 clockwise as illustrated in FIG. 7 to press the body 110 in the radial direction, thereby narrowing the gap of the slits 112.

[65] As such, the dental bone-cutting instrument 300 according to the current embodiment of the present invention includes the slit tightening portion 330 with the tightening member 332 and the tightening cam 334, thereby performing a process of narrowing the gap of the slits 112 to cause the clamping portion 120 to clamp the protruding bone by simple manipulation of a one-touch type.

[66] The embodiments of the present invention have been disclosed in the drawings and specification. Although specific terms are used in the foregoing description, these terms are merely for purposes of illustration and are not intended to define or limit the scope of the invention. Accordingly, it will be understood by one of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. Industrial Applicability

[67] The present invention is applicable to a technical field such as a dental instrument used in dental treatment including an implant operation.

Claims

[1] A dental bone-cutting instrument for cutting a protruding bone remaining in a hole after drilling of the hole in an alveolar bone, the dental bone-cutting instrument comprising: a body comprising at least one slit formed along a longitudinal direction of the body; a clamping portion extending from the body and holding the protruding bone as a gap of the at least one slit is narrowed; and a slit tightening portion coupled to the body and narrowing the gap of the at least one slit by pressing the body to cause the clamping portion to hold the protruding bone. [2] The dental bone-cutting instrument of claim 1, wherein the body comprises a tapered region whose diameter progressively increases toward a lower portion of the body, and the slit tightening portion is a tightening sleeve which is coupled to the tapered region to move upwardly and downwardly and narrows the gap of the at least one slit by pressing the body in a radial direction when moving downwardly. [3] The dental bone-cutting instrument of claim 2, wherein the tightening sleeve is coupled to the tapered region to move with respect to the body in a sliding manner. [4] The dental bone-cutting instrument of claim 2, wherein the tightening sleeve is screw-coupled to the tapered region to move upwardly and downwardly with respect to the body by being rotated. [5] The dental bone-cutting instrument of claim 1, wherein the slit tightening portion comprises: a tightening member coupled to the body along a circumference of the body and whose both ends are disposed in a side of the body; and a tightening cam rotatably coupled to the both ends of the tightening member with contacting the side of the body, and pressing the body in the radial direction and releasing the pressing of the body by the rotation of the tightening cam. [6] The dental bone-cutting instrument of claim 1, wherein the body is provided with at least one discharge hole for discharging the protruding bone which is cut and temporarily received in the body. [7] The dental bone-cutting instrument of claim 1, further comprising a handle coupled to an upper portion of the body, wherein a force required for cutting the protruding bone is applied to the handle. [8] The dental bone-cutting instrument of claim 7, wherein the handle has an angular shape. [9] The dental bone-cutting instrument of claim 7, wherein the handle extends from the upper portion of the body to be formed as one piece with the body. [10] The dental bone-cutting instrument of claim 7, wherein the handle is coupled to the upper portion of the body in a forced insertion manner or a screw-coupling manner. [11] The dental bone-cutting instrument of claim 1, wherein the clamping portion comprises a pair of clamping pieces extending downwardly from a lower portion of the body and being spaced apart from each other. [12] The dental bone-cutting instrument of claim 1, wherein the clamping portion has an inner side contacting the protruding bone, which is processed to be rougher than an outer side of the clamping portion. [13] The dental bone-cutting instrument of claim 1, wherein an inner side of a lower portion of the clamping portion is provided with an edge protruding inwardly to facilitate cutting of the protruding bone.