WO2012111990A2

WO2012111990A2 - Dental drill

Info

Publication number: WO2012111990A2
Application number: PCT/KR2012/001173
Authority: WO
Inventors: 문종훈; 박무용
Original assignee: 오스템임플란트(주)
Priority date: 2011-02-17
Filing date: 2012-02-16
Publication date: 2012-08-23
Also published as: TW201235015A; KR101128730B1; TWI472317B; WO2012111990A3

Abstract

The present invention relates to a dental drill for quickly and safely lifting the sinus without damaging the mucous membrane therein when operating the sinus. The dental drill, according to the present invention, comprises a connection portion which is formed on the upper end of a body so as to be connected to a driving device, and a cutting portion, which is formed at the lower end of the body, having cutting blades for drilling, wherein the cutting portion comprises a plurality of cutting blades which are arranged in a circle so as to have a cylindrical shape with an empty hollow inside to allow collection of a main disk, and wherein the cutting blades are provided with an curved surface end at the end, which is rounded, so that damage to the mucous membrane can be prevented even when the outer circumferential edge of the end of the cutting portion comes into direct contact with the mucous membrane when drilling.

Description

Dental drill

The present invention relates to a dental drill for use in the oral cavity of a patient, and more particularly, to a dental drill that can be quickly and safely perforated in the maxillary sinus without damaging the mucous membrane inside the maxillary sinus during the maxillary sinus procedure will be.

In the skull of the human body, there are empty spaces such as maxillary sinus, frontal sinus and sphenoid sinus, which play a role of reducing the weight of the skull and resonating sound, and a mucosa exists between the empty space and the skull. The presence of such mucosa acts as a cause of difficulty in the procedure when approaching the maxillary sinus and placing the implant.

Problems during the procedure occur when a hole is formed to implant a bone into an empty space of the maxillary sinus. That is, the maxillary sinus mucosa can be easily torn when the drill's blade touches the mucosa or the surgeon exerts excessive force during the rotation of the drill during the drilling of the maxillary sinus. Because tearing of the mucosa can cause problems such as infection of the maxillary sinus, the operator should always be careful to avoid tearing as much as possible.

In the process of drilling by rotating the drill in the oral cavity, the operator most judges the perforation of the maxillary sinus by the operator's fingertips. Check the depth of perforation by checking the thickness of the maxilla by X-ray or CT, but the bone in the maxillary sinus exists in various forms such as flat, concave, and septum. Because of the shape, the procedure is always under pressure that the mucous membrane may be perforated.

In order to reduce the burden on the operator, conventionally, the end of the drill is blunted so that the mucosa is not torn even when the rotating blade touches the mucosa, or the drill is operated in low speed or hand mode with low cutting force, A method has been proposed in which diamond grit of particles is attached to a tool to crush bone.

However, such conventional drills have a problem that the drilling operation takes a long time because the blade is blunted or the drilling operation is performed at a low speed to avoid tearing of the mucosa.

And the ejection and cutting of the cut bone chip is not made smoothly, and the bone part being cut is partially heated by friction heat with the drill, or the operator exerts excessive force. The problem is that there is a risk of perforating the mucous membranes.

The present invention to solve the above problems, in the side approach that is the implantation method of maxillary sinus implant, while the drill has the inherent function of drilling or expanding the cortical bone and sponge bone like a normal drill, while the drill is in direct contact with the maxillary sinus membrane By providing a drill that prevents damage to the maxillary sinus membrane by elevating the maxillary sinus membrane quickly and safely, it is intended to increase the clinical success rate after the procedure while providing safety and convenience to the implant procedure.

According to an aspect of the present invention for achieving the above object, a dental including a connecting portion formed on the top of the body to be connected to the drive device, and a cutting portion formed on the bottom of the body and having a cutting edge for drilling As the drill, the cutting portion is formed by arranging a plurality of cutting edges in a circular shape so as to have a hollow cylindrical shape with a hollow inside, and the cutting of the disk is possible, and an end curved surface is formed at the end of the cutting edge. Thus, a dental drill is provided, which is capable of preventing damage to the mucosa even when the terminal outer peripheral edge portion of the cutting portion directly contacts the mucosa during the drilling operation.

At least one inclined surface is preferably formed in the trailing portion of each said cutting edge.

The cutting edge preferably has a leading edge portion that curves toward the leading direction toward the end of the cutting edge.

It is preferable that a chip pocket is formed between the cutting edges to easily discharge and store chips of the bone to be cut.

The inner circumferential surface of the cutting portion having the hollow portion formed therein is formed such that the inner diameter decreases toward the base side and the inner diameter increases toward the distal end, or the inner diameter is constant, so that the present disk produced by the cutting operation can be easily discharged from the hollow portion. It is desirable to be able to.

It is preferable that grinding processing is performed with respect to the cutting edge so that the edge portion of the cutting edge becomes sharp.

It is preferable that a diameter enlargement portion having a gradually increasing diameter is formed between the relatively small diameter body and the relatively large diameter cutting portion.

Preferably, between the cutting portion and the body, a stepped portion protruding outward and a stop portion protruding further outward from the base end of the stepped portion are formed.

It is preferable to further include a stopper that can be fixed to the stepped portion.

The stopper preferably includes an engaging portion having an inner circumferential diameter equal to the outer circumferential diameter of the stepped portion, and a fitting preventing portion having an inner circumferential diameter smaller than the outer circumferential diameter of the stepped portion.

The coupling part may be divided into a plurality of pieces by an incision extending upward and downward, and a protrusion is formed at the base of the stepped part to ensure the coupling state of the coupling part to the stepped part and the inner circumferential end of the coupling part. It is preferable that a recess is formed in the protrusion to fit the protrusion.

At least one opening is preferably formed in the cutting portion to facilitate removal of the bone disk or the bone chip which can be inserted into the hollow portion formed inside the cutting portion.

An angle formed between the side line of the inclined surface generated by processing the inclined surface and the end curved surface is preferably less than or equal to 90 degrees and greater than or equal to 1 degree.

The end curved surface may be formed by rounding the outer circumferential edge and the inner circumferential edge of the cutting portion, and the round radius of the outer circumferential side edge of the end curved surface is preferably greater than or equal to the round radius of the inner circumferential side edge.

A step may be formed between the inclined surface and the end curved surface.

According to another aspect of the present invention, a dental drill comprising a connecting portion formed on the top of the body to be connected to the drive device, and a cutting portion formed on the bottom of the body and having a cutting edge for drilling, wherein the cutting portion And a plurality of cutting edges arranged in a circular shape to have a hollow hollow cylindrical shape, and chip pocket portions formed between the cutting edges and filled with the cut chips. Is provided with at least one inclined surface formed in the trailing portion and a leading edge portion curved toward the leading direction toward the distal end of the cutting edge.

It is preferable to further include a stopper fitted to partially surround the cutting portion.

According to the present invention as described above, in the lateral approach of the maxillary sinus implant placement method, while having the drill's inherent function of drilling or expanding cortical bones and sponges like a general drill, even if the drill is in direct contact with the maxillary sinus membrane A dental drill may be provided that can elevate the membrane quickly and safely to prevent damage to the maxillary sinus membrane.

According to the dental drill of the present invention, the drill tip has a structure that can form a bone disk (bone disk) and can be easily separated.

According to the dental drill of the present invention, a bone chip can be easily filled between the blade and the blade formed at the tip of the drill, so that even when the drill blade is in direct contact with the maxillary sinus membrane, it can safely elevate the maxillary sinus membrane. do.

As described above, according to the present invention, the maxillary sinus membrane can be safely approached and lifted more rapidly during the maxillary sinus procedure, the procedure area is small, the occurrence of edema after the procedure is suppressed, and the use of bone graft material can be reduced.

1 is a front view of a dental drill according to the present invention,

2 is a plan view of a cutting portion of a dental drill according to the present invention;

3 is a perspective view of a cutting portion of a dental drill according to the present invention;

Figure 4a is a front view of the cutting portion of the dental drill according to the present invention,

4b is an enlarged view of an essential part of a cutting part of a dental drill according to the present invention;

5 is a cross-sectional view of the cutting portion of the dental drill according to the present invention,

6 is a front view of a dental drill according to the present invention with a stopper mounted thereon;

7 is a cross-sectional view of the stopper of the dental drill according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the dental drill which concerns on preferred embodiment of this invention is demonstrated in detail with reference to drawings.

As shown in Figures 1 to 6, the dental drill according to a preferred embodiment of the invention, one end of the substantially cylindrical body 10 (ie, to be connected to a drive device such as a hand driver or a dental treatment engine) 1, a cutting portion 30 formed at the other end of the body 10 (i.e., the lower end in FIG. 1) and the cutting edge 30 for drilling, formed at the connecting portion 20 formed at the upper end in FIG. It includes.

The cutting part 30 has a hollow cylindrical shape with an empty inside, and has a structure in which a bone disk is formed in the center. This disk can be useful when you want to close the hole formed in the bone after the procedure is completed.

A plurality of cutting edges are formed in the cutting portion 30, and as shown in FIG. 2, the plurality of cutting edges 31 (exemplified as having eight cutting edges in FIG. 2) are arranged in a circular shape. It is.

The end of the cutting part 30, that is, the end curved surface 32 of the cutting edge 31 is rounded, so that the outer circumference and the inner circumferential edge of the cutting part 30 are rounded, as shown in FIG. Accordingly, even when the cutting edge 31 of the drill is in direct contact with the maxillary sinus membrane, the maxillary sinus membrane can be safely elevated. That is, since the internal structure of the maxillary sinus has an irregular shape, there is a possibility that the cutting edge 31 does not approach in a direction perpendicular to the maxillary sinus membrane, but even in this case, the outer and inner edges of the cutting part 30 are rounded. According to the drill of the present invention, damage to the maxillary sinus membrane can be prevented.

Referring to the distal end surface 32 of the cutting portion shown in the lower left of Figure 5, it can be seen that the end radius 32 has a round radius of the outer peripheral side edge is larger than the round radius of the inner peripheral side edge. However, according to the present invention, the end curved surface 32 may have a shape in which the round radiuses of the outer circumferential side and the inner circumferential side corner are formed in the same manner as shown. In addition, the cross-sectional shape of the end surface 32 may have a semi-circle, semi-ellipse, a square rounded corner (round).

1, 3, 4A and 4B, the trailing portion of each cutting edge 31, more specifically the end surface 32, with respect to the direction of rotation of the drill The trailing portion of the plurality of inclined surfaces are formed to improve the drill cutting force. When the cutting force is improved in this manner, flexibility can be given to the cutting speed from low speed to high speed, which is preferable. In particular, the chip can be taken during low-speed rotation, and at the time of high-speed rotation, the procedure time can be shortened, and the operator can be given the convenience of the procedure. In the figure, each cutting edge 31 is illustrated as having two inclined surfaces, the primary inclined surface 33a and the secondary inclined surface 33b. When each cutting edge 31 has a plurality of inclined surfaces, the bone chips cut by the cutting edges can be discharged through the chip pocket 34 and at the same time, some bone chips can be supplied to the ends of the cutting portions 30. Thus, the present chip can be filled between the cutting edge and the cutting edge.

4A and 4B, in the dental drill according to the present invention, the primary inclined surface 33a of the cutting edge 31 is illustrated as being inclined from the distal curved surface 32. Between the primary inclined surface 33a and the end curved surface 32 following the primary inclined surface 33a (that is, the end curved surface 32 located in the trailing direction of the primary inclined surface 33a) are shown. As step is formed. The larger the step is, the easier the cutting is and the cutting efficiency is improved, but there is a problem that the risk of damage to the mucosa increases when the cutting edge contacts the mucosa. According to the dental drill of the present invention, the step is made small so that the mucous membrane is not damaged even when the cutting edge and the mucous membrane come into contact with each other, and the cutting edge is sharpened by polishing the cutting edge as described below. To improve.

The number of cutting edges 31 and the number of the inclined surfaces described above are merely examples, and of course, they are not limited to those illustrated in the drawings.

In addition, as shown in FIGS. 1, 3, 4A, and 4B, the leading edge portion 35 of the cutting edge 31 increases drill cutting force and smoothly discharges bone chips. It is preferable to have a curved shape curved toward the leading direction toward the end of the cutting edge 31 in order to. The distal end 35a of the leading edge portion 35 thus has an approximately gentle hook shape.

As described above, according to the present invention, since the distal end portion 35a of the leading edge portion 35 is curved toward the leading direction while having a substantially smooth hook shape, the case having a straight shape or the opposite side of the leading direction, that is, trailing The cutting force can be remarkably improved as compared with the case curved in the trailing direction.

Referring to FIG. 4B, which shows an enlarged main part of the cutting portion, the side line 33c generated by cutting the primary inclined surface 33a and the secondary inclined surface 33b extends substantially in the vertical direction, and the end curved surface 32 It can be seen that the) extends substantially in the horizontal direction, and accordingly, the angle A formed between the distal end surface 32 and the side line 33c is approximately 90 degrees. According to the present invention, when the primary inclined surface 33a and the secondary inclined surface 33b are formed, the side edge 33c is formed to be inclined toward the distal end 35a of the leading edge portion 35. It is preferable because the cutting force can be improved. In this way, the angle A formed between the distal end surface 32 and the side line 33c may be smaller than 90 degrees. The angle A is preferably less than or equal to 90 degrees and greater than or equal to 1 degree. Meanwhile, the angle A may be smaller than or equal to 90 degrees and greater than or equal to an angle formed between the distal end surface 32 and the distal end portion 35a of the leading edge portion 35. According to the present invention, the angle formed between the tangent of the distal end surface 32 and the distal end portion 35a of the leading edge portion 35 may be 1 degree or more.

Meanwhile, according to the present invention, the distal curved surface 32 may extend in the horizontal direction or may be formed to be inclined toward the upper right side in FIG. 4B.

It is preferable that a chip pocket 34 is formed between the cutting edge 31 and the cutting edge 31 to easily discharge and store bone chips of the cut bone. The chip pocket portion 34 is formed not only on the side of the cutting portion 30 but also on the end surface of the cutting portion 30, that is, the other cutting edge 31 adjacent to the end curved surface 32 of one cutting edge 31. It is also formed between the end surface 32 of the).

2 and 5, the hollow part 30a is formed in the cutting part 30. The inner circumferential surface 36 of the cutting portion is formed such that the inner diameter decreases toward the base (i.e., the upper view in FIG. 5) and the inner diameter increases toward the distal end (i.e., the lower view in FIG. 5). The resulting bone can be pressed against the outside of the hollow portion 30a, and the separation of the bone can be performed easily. Alternatively, the inner circumferential surface 36 of the cutting portion may be formed so that the inner diameter is constant. The outer circumferential surface of the cutting portion 30 may also have a different outer diameter at the base and the end so that the surface is inclined, or the outer diameter is constant.

On the other hand, one or more openings 37 are formed in the cutting portion 30 to easily remove the bone disk or the bone chip that can be inserted into the hollow portion 30a.

Further, according to the present invention, after the cutting edge is formed on the surface of the cutting portion 30, the cutting edge is further ground to further sharpen the edge portion of the cutting edge. In this embodiment, the part to which grinding is performed is the rounded end surface 32 of the cutting edge end, and can improve cutting performance by this. When the cutting force is improved in this manner, flexibility can be given to the cutting speed from low speed to high speed, which is preferable. In particular, it is easy to collect the chip during low-speed rotation, the effect of shortening the treatment time during high-speed rotation can give the operator convenience.

In the present specification, the expression that the grinding (or polishing) processing is performed on the cutting edge, that is, the main cutting edge and the auxiliary cutting edge, is generally performed after the mechanical cutting processing used to form the cutting edge of the drill. This may be carried out additionally, which means that the grinding process may be carried out so that the grinding is performed at the same time forming the cutting edge only by the grinding process.

Grinding may be performed as a whole about the end surface 32, and grinding may be performed only to the outer peripheral side.

On the other hand, the chip pocket portion 34 formed between the cutting edges may be filled with the cut bone chip, and the chip fills the chip pocket portion 34 between the cutting edges. Accordingly, the distal end of the cutting part 30 may have a smooth shape, so that the cutting edge is in contact with the maxillary sinus membrane but may not damage the maxillary sinus membrane. Therefore, even if the cutting edge is ground to sharpen the cutting edge, damage to the mucosa can be prevented.

According to the dental drill of the present invention, between the relatively small diameter body 10 and the relatively large diameter cutting portion 30, a diameter enlargement portion 11 gradually increasing in diameter is formed so that the drill is suitable. The strength can be maintained.

Moreover, between the cutting part 30 and the diameter expansion part 11, the step part 13 which protruded outwardly and the stop part 15 which protrudes further outward from the base end of this step part 13 are provided. Can be formed. As shown in FIG. 6, the stopper 40 may be fitted and fixed to the stepped part 13. The stepped portion 13 may have dimensions for fitting the stopper 40 and the stop 15 prevents the stopper 40 from being inserted anymore. The stepped part 13 is formed in the base of the cutting part 30, and the stop part 15 is formed in the diameter expansion part 11 side.

A plurality of stoppers 40 having different heights may be provided, and the practitioner may selectively fit the stopper 40 of the appropriate dimension into the stepped portion 13 according to the depth of the hole to be formed by the drill. The stopper 40 may limit the drilling depth, which may make the procedure easier for the operator. In addition, even if an accident such as the sliding of the drill on the bone surface during use of the drill, it is possible to prevent the gum from being damaged by the stopper.

Referring to FIG. 7, the stopper 40 partially enclosing the cutting portion 30 includes an engaging portion 41 having an inner circumferential diameter approximately equal to or larger than an outer circumferential diameter of the stepped portion 13, and an inner circumferential diameter. It includes a fitting preventing portion 45 smaller than the outer peripheral diameter of the stepped portion (13).

Coupling portion 41 may be divided into a plurality of pieces by the incision 42 extending up and down as shown in FIGS. 6 and 7. The widths of the pieces or the width of the cutouts formed by dividing by the cutouts may or may not be constant. In addition, the cutouts 42 may be formed at equal intervals or may be formed at uneven intervals.

In order to more securely ensure the engagement state of the engaging portion 41 to the stepped portion 13, a convex protrusion 14 is formed on the base of the stepped portion 13, that is, the surface of the stopped portion 15 side of the stepped portion. In the inner circumferential end of the engaging portion 41, it is preferable that a concave portion 43 that can be fitted to the protruding portion 14 is formed.

In addition, in order to prevent the operator from using the stopper 40 upside down by mistake, as described above, the inner circumferential diameter of the fitting preventing portion 45 is smaller than the outer circumferential diameter of the stepped portion 13 so as to prevent the stopper 40 from being used. It is desirable to make it impossible to insert it upside down. Accordingly, while using the stopper 40 in a state of being coupled upside down by error, it is possible to prevent the accident of dropping the stopper in the mouth of the patient.

The end surface of the stopper 40 can be processed so that the end surface is not smooth by forming a plurality of grooves. In this way, when using the dental drill according to the present invention, the stopper 40 fitted to the stepped portion 13 initially rotates together with the stepped portion 13, but the cutting proceeds and the stopper 40 is placed on the bone surface. In contact, the rotation of the stopper 40 may be stopped. The operator can visually confirm the stop of the stopper 40 and recognize that the cutting part 30 has reached a predetermined depth.

As described above, the dental drill according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, and in the technical field to which the present invention pertains. Of course, various modifications and variations can be made by those skilled in the art.

Claims

A dental drill comprising a connecting portion formed at an upper end of a body to be connected to a driving device, and a cutting portion formed at a lower end of the body and having a cutting edge for drilling.

The cutting part is made of a plurality of cutting edges are arranged in a circular shape so as to have a hollow cylindrical shape of the hollow inside, it is possible to collect the disk,

The end of the cutting edge is a rounded end curved surface is formed is a dental drill, characterized in that the damage to the mucosa can be prevented even when the outer peripheral edge portion of the cutting portion is in direct contact with the mucosa during the drilling operation.
The method according to claim 1,

Dental drill, characterized in that one or more inclined surface is formed in the trailing portion of each of the cutting edge.
The method according to claim 1,

And the cutting edge has a leading edge portion that curves toward the leading direction toward the end of the cutting edge.
The method according to claim 1,

Dental drill, characterized in that formed between the cutting edge chip pocket to easily discharge the chip of the bone being cut at the same time.
The method according to claim 1,

The inner circumferential surface of the cutting portion having the hollow portion formed therein is formed such that the inner diameter decreases toward the base side and the inner diameter increases toward the distal end, or the inner diameter is constant, so that the present disk produced by the cutting operation can be easily discharged from the hollow portion. Dental drills, characterized in that.
The method according to claim 1,

A dental drill, characterized in that the grinding processing is performed on the cutting edge so that the edge portion of the cutting edge is sharpened.
The method according to claim 1,

Dental drill, characterized in that the diameter expansion portion is gradually formed between the relatively small diameter of the body and the relatively large diameter cutting portion is formed.
The method according to claim 1,

A dental drill, characterized in that between the cutting portion and the body, a stepped portion protruding outwardly and a stop portion protruding further outward from the base end of the stepped portion.
The method according to claim 8,

Dental drill, characterized in that it further comprises a stopper that can be fixed to the stepped portion.
The method according to claim 9,

The stopper may include a coupling part having an inner circumferential diameter equal to the outer circumferential diameter of the stepped portion, and a fitting preventing portion having an inner circumferential diameter smaller than the outer circumferential diameter of the stepped portion.
The method according to claim 10,

The coupling part may be divided into a plurality of pieces by an incision extending upward and downward, and a protrusion is formed at the base of the stepped part to ensure the coupling state of the coupling part to the stepped part and the inner circumferential end of the coupling part. Dental drill, characterized in that the recess is formed that can be fitted to the protrusion.
The method according to claim 1,

And at least one opening is formed in the cutting portion to facilitate removal of the bone disk or the bone chip which can be inserted into the hollow portion formed inside the cutting portion.
The method according to claim 2,

Dental drill, characterized in that the angle formed between the side line of the inclined surface generated by processing the inclined surface and the distal surface is less than or equal to 90 degrees and greater than or equal to 1 degree.
The method according to claim 1,

The end curved surface may be formed by rounding the outer circumferential edge and the inner circumferential edge of the cutting portion, wherein the round radius of the outer circumferential edge of the end curved surface is greater than or equal to the round radius of the inner circumferential side edge.
The method according to claim 2,

Dental drill, characterized in that the step is formed between the inclined surface and the distal surface.
A dental drill comprising a connecting portion formed at an upper end of a body to be connected to a driving device, and a cutting portion formed at a lower end of the body and having a cutting edge for drilling.

The cutting part includes a plurality of cutting edges arranged in a circular shape so as to have a hollow cylindrical shape with an empty inside, and a chip pocket portion formed between the cutting edges and filled with the cut chips.

Wherein each of the cutting edges comprises at least one inclined surface formed in the trailing portion and a leading edge portion curved toward the leading direction toward the distal end of the cutting edge.
The method according to claim 16,

And a stopper fitted to partially surround the cutting portion.