JP3336170B2 - Dental treatment instrument and method for manufacturing dental treatment instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental treatment instrument which realizes cutting of a root canal wall by a rotating operation, and a method of manufacturing the dental treatment instrument.

[0002]

2. Description of the Related Art There is an H file as an instrument for treating a root canal. The H file has a function of flexibly bending along the root canal wall to delete the root canal wall up to the apex, and has an axial shaft portion provided with a handle at one end for a doctor to operate. And a tapered working portion formed continuously at the end of the shaft portion, and a spiral blade having a large torsion angle is formed over the entire length of the working portion.

A spiral blade 52 is formed in the H file 51 by grinding a material having a predetermined taper with a predetermined torsion angle, and as shown in FIG.
When the H file 51 is cut along the axis 51a, the blade 52 is formed in a saw blade shape having a cutting edge 52a, a rake face 52b, and a flank 52c formed by a grinding face connecting the cutting edge 52a and the rake face 52b. A line 53 connecting the cutting edges 52a of the respective blades 52 is arranged on a preset taper. The rake face of blade 52
52b is formed in a direction perpendicular to the axis 51a, and a surface connecting the cutting edge 52a and the bottom of the rake face 52b is formed as a flank face 52c. Therefore, the rake angle of the blade 52 in the direction along the axis 51a of the H file 51 is 0 degree, and the angle between the rake face 52b and the flank 52c is 90 degrees or less.

[0004] As shown in FIG.
When cutting 51 at a right angle to the axis 51a, the rake face 52b of the blade 52
Is formed on the radius, the rake angle is 0 degree, and the cutting edge 52
The angle formed by the rake face 52a and the flank face 52d formed by the circumferential grinding face is less than 90 degrees.

[0005] In the above H file, the root canal wall can be cut by any of the rotation operation and the axial reciprocating operation (push-pull operation). However, when the H-file is rotated to cut the root canal wall, when the blade comes into contact with the root canal wall, a thrust corresponding to the torsion angle of the blade acts, and the blade bites into the root canal wall, resulting in an excessive screw. There is a high risk of breakage or breakage due to the twisting force. In particular, when the working unit is broken in the root canal, it is necessary to remove the H file remaining in the root canal, which causes a problem that a surgical operation is required. For this reason, it is a rule that the H file cuts the root canal wall by a push-pull operation.

In cutting the root canal wall, there is a problem that a ledge is formed on the root canal wall by a sharply pointed end of the working portion in association with the pushing and pulling operation of the H file, and in a severe case, the hole is perforated. For the purpose of solving this problem, there has been proposed an H file in which a portion having no cutting function is formed at the tip of a working section.

For example, a technique disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-180415 discloses a cutting blade (a helical blade formed in a working portion) formed with a guide portion having a circular or oval cross section at the tip. It is. The technique disclosed in Japanese Patent Publication No. 61-106 has a cutting portion extending over a part of the working length and a smooth tip portion for guiding the tip into the crown. .
In these techniques, a guide portion having no cutting function is provided at the tip of the working portion, and the working portion is introduced along the root canal by the guide portion.

[0008] In the H file, the distal end portion and the intermediate portion of the working section abut on the root canal wall and bend. Therefore, at least two portions of the root canal wall are cut by the push-pull operation. However, it may not be desirable to cut two locations on the root canal wall at the same time. In order to solve this problem, there has been proposed an H file in which the tip of the working unit is formed smooth and round, and one side surface of a number of blades formed in the working unit is removed to form a flat surface ( Japanese Patent Publication No. 5-10943.

When the H-file is rotated, there is a danger that the blade at the tip of the working portion may cut into the root canal wall and break or break. In order to solve this problem, a technique of greatly changing the pitch of the cutting edge has been proposed (Japanese Utility Model Publication No. Sho 62-6).
No. 51). This technology changes the pitch of the cutting blades in the axial direction of the working part so that even if the cutting blades bite into the root canal wall with the rotation of the H-file, the cutting bites into the root of the root canal. By limiting the length, breakage or breakage is prevented.

[0010]

Problems to be Solved by the Invention
If the tip of the working part is a solid non-cutting part as in the H file disclosed in Japanese Patent Publication No. However, there is a problem in that it is not possible to perform accurate shaping up to the point described above, and it is not possible to remove foreign matter present in the root canal.

As disclosed in Japanese Utility Model Publication No. Sho 62-651, an H file in which the pitch of the cutting edge is greatly changed is as follows.
Since the cutting performance partially changes, it may be difficult to shape the root canal wall properly. In particular, this technique is intended to prevent breakage or breakage that occurs when an H file, which is basically a push / pull operation, is basically rotated, and that the H file cannot withstand the rotation operation. Absent.

As described above, the conventional H-files do not have the idea of treating the root canal by rotating all of them, but solve the problem that occurs when performing the treatment by pushing and pulling operations. The fact is that there is no technology that attempts to solve various problems.

However, since the H file has a larger torsion angle of the blade and higher cutting performance in the circumferential direction than other instruments for root canal treatment, the H file is rotated. It is not hard to imagine that this would enable effective root canal shaping. That is, by solving various problems caused by high cutting performance in the circumferential direction, the H file can be used as a more effective root canal treatment instrument.

One of the problems to be solved is that when an H-file bent in contact with a root canal wall is rotated, a bending stress is repeatedly applied to the H-file with the rotation, and bending fatigue is applied to the material. There is a possibility that it may occur and be damaged. Therefore, selection of a material that flexes flexibly along the root canal wall and has sufficient strength against bending is also an important issue to be solved.

When rotating the H file, it is preferable to use a rotary drive device called a handpiece rather than a manual operation by a doctor. However, the conventional H-file is basically a push-pull operation by a doctor, and there is no idea that the H-file is used by attaching it to a handpiece.

An object of the present invention is to provide a dental treatment instrument capable of shaping a root canal wall by a rotating operation, completely removing foreign matter in the root canal, and accurately shaping the root apex. Is to do.

[0017]

A dental treatment instrument according to the present invention comprises a shaft portion and a working portion formed continuously with the shaft portion and having a predetermined tip diameter and taper. A spiral blade portion formed at a predetermined length from the shaft portion side of the portion, and a flat surface and a cylindrical surface formed between an end portion on the distal end side of the spiral blade portion and a distal end of the working portion. And a non-spiral portion.

The above dental treatment instrument (hereinafter referred to as "H file")
), A spiral blade portion is formed at a predetermined length from the shaft side of a working portion having a preset tip diameter and a taper, and a flat surface and a cylindrical surface are formed between the spiral blade portion and the tip portion. Is formed in the spiral blade, a rake angle of 0 degree in the circumferential direction is formed on the spiral blade, and the tip of the distal end of the spiral blade and the distal end of the working unit are formed. A non-spiral portion consisting of a flat surface and a cylindrical surface is formed between them. In this non-spiral portion, edges are formed on both sides along the axial direction of the flat surface, the rake angle being 0 degrees and the flank surface being the cylindrical surface of the material.

For this reason, when the H-file is inserted into the root canal and the distal end of the working portion reaches the apex, the flat surface forming the non-spiral portion formed at the distal end, the root canal wall, A gap is formed between the gaps, and foreign matter at the apical portion of the root canal can be removed through the gap. In addition, the root canal wall can be shaped by edges formed on both sides along the axial direction of the flat surface with the rotation operation of the H file.

In particular, since the distal end of the working section is formed as a flat surface, even if the H file is rotated while the distal end of the working section is in contact with the root canal wall, the distal end of the H file remains on the root canal wall. There is no bite. That is, the edge formed at the tip of the working section is substantially straight and has almost no leads.
Even when the root canal wall is cut by rotating the file, no force (thrust) acting in the direction in which the H file is propelled is generated with the rotation, and the root canal does not bite. .

Further, in the method for manufacturing a dental treatment instrument (H file) according to the present invention, a wire comprising a straight portion corresponding to a shaft portion and a portion having a predetermined tip diameter and a taper corresponding to a working portion is formed. Then, a whetstone formed so as to form a rake face and a flank of a target dental treatment instrument is pressed into contact with a position corresponding to a working portion of the wire, and the wire is moved in the axial direction while rotating. In addition to forming a helical blade portion constituting the portion, the non-spiral portion is formed by stopping the rotation of the wire and moving the wire in the axial direction.

In the above-mentioned manufacturing method, a wire rod including a straight portion corresponding to the shaft portion of the H file and a portion having a predetermined tip diameter and a taper corresponding to the working portion is formed by means such as grinding. In addition, a grindstone formed so as to be able to grind the rake face and flank face corresponding to the blade with one pitch constituting the spiral blade portion of the target H file is prepared, and this grindstone is arranged at a position corresponding to the working section. The helical blade portion can be formed by bringing the wire into contact with the wire, rotating the wire, and simultaneously moving the wire in the axial direction corresponding to the pitch of the blade. When a non-spiral portion is formed, the non-spiral portion can be formed by moving the wire in the axial direction without rotating the wire.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an optimal embodiment of the H file will be described with reference to the drawings. FIG. 1 is a diagram illustrating the overall configuration of the H file, FIG. 2 is a diagram illustrating the configuration of the working unit, and is a diagram illustrating the non-spiral portion viewed from the side, and FIG. 3 is a diagram illustrating the configuration of the working unit. FIG. 4 is a diagram illustrating the configuration of the working unit, and FIG. 4 is a diagram illustrating the non-spiral portion viewed from the tip side, and FIG. 5 is a diagram schematically illustrating the manufacturing process of the H file. is there.

The H-file according to the present invention is configured so that the root canal wall can be cut while being mounted on a rotary drive device such as a handpiece and rotating and rotating, and the time required for forming the root canal wall is reduced. It is a shortened version so that dental treatment can be performed easily. For this reason, in the present invention, the tip portion of the working portion is a non-spiral portion composed of a flat surface and a cylindrical surface, and is configured so that thrust cannot be generated even if the portion rotates and contacts the root canal wall. . Further, by forming the shaft portion integrally with the shank gripped by the handpiece, the H-file can be mounted on the handpiece and driven to rotate.

The structure of the H file according to the present invention will be specifically described with reference to FIGS. As shown in FIG.
The H file is configured by integrally connecting the main body A and the shank B to each other. The shank B is attached to a chuck such as a handpiece (not shown) which is held and operated by a dentist, and the handpiece is driven. It is configured so that the root canal wall can be rotationally cut by using.

The main body A includes a shaft portion 1 and a working portion 2 having a tip diameter D set in advance corresponding to the size of the H file and a taper set in advance. The working unit 2 further includes a helical blade portion 2a formed with a helical blade in a predetermined length range continuously with the shaft portion 1;
It is divided into a spiral part 2a and a non-spiral part 2b formed between the tip of the working part 2.

The length of the main body A from the joint with the shank B to the tip is set to 25 mm as standard, the length of the working section 2 is set to 16 mm, and the standard length of the shaft section 1 is set to 9 mm. . Also, the taper of working part 2 is set to 2/100,
The tip diameter D is set in 20 different sizes in a stepwise manner within a range of 0.08 mm to 1.40 mm. Accordingly, the shaft portion 1 is formed in a shaft shape having a diameter obtained by adding 0.32 mm to the tip diameter D.

As shown in FIGS. 2 and 3, a blade 3 is formed in a spiral shape on a spiral blade portion 2a of the working portion 2. The blade 3 is constituted by a ground surface (rake face 3a) formed by spirally grinding the tapered surface of the working portion 2 and a tapered surface (flank 3b) left without being ground. I have. Accordingly, the rake angle in the circumferential direction of the cutting edge 3c of the blade 3 is 0 degree, and the angle between the rake face 3a and the flank face 3b of the cutting edge 3c is 90 degrees. Is also 0 degrees. The clearance angle in the axial direction is
tan (1/100), which is about 4 minutes. That is, the blade 3 formed on the spiral blade portion 2a has a rake angle and a clearance angle of 0 degrees in the circumferential direction, and a rake angle of 0 degrees in the axial direction and a clearance angle of about 0 degrees.

With the blade 3 configured as described above, it is possible to cut the root canal wall by operating in the circumferential and axial directions. However, the rake angle and the clearance angle in both the circumferential direction and the axial direction are 0 degree, and the depth of cut that can be cut is smaller than in the conventional H file.

The spiral blade portion 2a of the working portion 2 is formed to have a length of 14 mm to 15 mm starting from the shaft portion 1 side, and the distal end of the spiral blade portion 2a and the working portion 2 are formed. A non-spiral portion 2b of 1 mm to 2 mm is formed between the tip and the tip. The non-spiral portion 2 b is formed by a flat surface 4, a cylindrical surface 5 made of a material surface, and edges 6 formed along the axial direction on both sides of the flat surface 4 and the cylindrical surface 5. It is configured.

The flat surface 4 is formed by grinding a portion corresponding to the non-spiral portion 2b on the distal end side of the working portion 2 in parallel with the axis 7, and the portion left by this grinding forms the cylindrical surface 5. Has formed. Edges parallel to the axis 7 by the flat surface 4 and the cylindrical surface 5 are provided on both sides of the flat surface 4 formed by grinding the tapered portion corresponding to the non-spiral portion 2b. 6 are formed. Therefore, this edge 6 is formed in a non-spiral shape.

The distance of the flat surface 4 from the axis 7 is not particularly limited as long as the edge 6 can be formed in a non-spiral shape parallel to the axis 7. However, from the viewpoint of the manufacturing process, it is preferable to grind the flat surface 4 continuously with the grinding of the blade 3 constituting the spiral blade portion 2a. For this reason, the flat surface 4
Is preferably equal to the distance between the axis 7 and the bottom 8 of the blade 3 adjacent to the non-spiral portion 2b.

By configuring the flat surface 4 as described above, it is possible to form the blade 3, the flat surface 4, and the edge 6 in the same process using a single grinding tool. That is, the working unit 2
A material constituting the body A having a portion corresponding to a predetermined taper is prepared, and the material is formed according to the torsion angle of the blade 3 and the taper (gradient with respect to the axis 7) while pressing a rotating grinding tool against the material. The blade 3 is formed by relatively moving the grinding tool in the axial direction of the material and in the direction orthogonal to the axis 7. After forming the blade 3 at a portion corresponding to the spiral blade portion 2a, the rotation of the material is stopped while maintaining the rotation of the grinding tool,
By moving the material and the grinding tool relatively in the axial direction in this state, a flat surface 4 is formed at a portion corresponding to the non-spiral portion 2b, and edges 6 are formed on both sides of the surface 4 along the axial direction. I do. Therefore, the blade 3 and the flat surface 4 can be formed in the same process using the same grinding tool.

In the non-spiral portion 2b configured as described above,
A flat surface 4 is formed at a position separated from the axis 7,
And the cylindrical surface 5 form an edge 6 parallel to the axis 7. The distance from the axis 7 of the flat surface 4 to the non-spiral portion 2
b and the bottom 8 of the adjacent blade 3 are identical, the edge 6
The angle between the flat surface 4 and the cylindrical surface 5 is an obtuse angle of 90 degrees or more.

In the edge 6, the edge 6 is formed parallel to the axis 7, and the rake angle is 0 degree and the relief angle is obtuse. Therefore, when the main body A is rotated by bringing the edge 6 into contact with the root canal wall, it is possible to cut the root canal wall to remove cutting debris or to remove foreign substances existing at the apical part. . However, it does not cut into the root canal wall, and even if it does, the edge 6 is formed in a non-spiral shape, so that it does not bite deep by the application of thrust.
When the body A is pushed and pulled, the edge 6 does not exert a cutting force.

As described above, by providing the non-spiral portion 2b composed of the flat surface 4 and the cylindrical surface at the tip of the working portion 2, even when the main body A is rotated, the working portion 2 bites into the root canal wall. Can be prevented. Therefore, the shape of the distal end portion of the working portion 2 (the distal end portion of the non-spiral portion 2b) may be a blunt sphere or flat surface as shown in FIG. Regardless of the shape of the tip of the working portion 2, the working portion 2 does not bite into the root canal wall. In this manner, it is possible to cut the root canal wall by pushing or pulling or rotating the main body A.

For example, when the main body A is used to form an H file limited to a push-pull operation, stainless steel or spring steel is used as a material for forming the main body A in the same manner as a conventional H file, and a dental It can be configured by attaching a handle that can be grasped and operated by a doctor.

When an H file for cutting a root canal wall by rotating and pushing and pulling the main body A is used, the main body A is made of a material having flexibility and strength against bending fatigue. It is necessary to have. As such a material, there is a stainless steel or a superelastic alloy in which a tissue is stretched into a fiber shape by cold drawing. In particular, when the main body A is formed using a superelastic alloy, it is possible to realize flexible bending when performing treatment, and it is possible to form a preferable H file.

The present inventors conducted a comparative experiment on the durability of the main body A made of a superelastic alloy and the main body A made of stainless steel corresponding to the # 25 H file (material diameter 0.6 mm, tip diameter D 0.25 mm). went. In this experiment, each body A was protruded 25 mm from the chuck and attached to the handpiece, and the protruding part was bent at a position 12 mm from the tip to 60 degrees.
It was inserted through a 0.82 mm stainless steel pipe and rotated at 125 rpm to measure the time to break and the number of rotations. The number of samples of each body A was 3.

As a result of the above experiment, in the main body A made of a superelastic alloy, the average time to break was 2 minutes and 31 seconds, and the number of revolutions at this time was 314 times. On the other hand, in the case of the main body A made of stainless steel, the time to break was 10 seconds, and the number of revolutions at this time was 21 times.

From the above experimental results, in this example, a superelastic alloy made of a nickel-titanium alloy is used as a material constituting the main body A. The main body A is formed by subjecting the superelastic alloy to a predetermined processing and then performing a memory heat treatment, or forming a main body A by performing a predetermined processing to a superelastic alloy that has been subjected to a memory heat treatment in advance. The order of the memory heat treatment and the processing step for the superelastic alloy is not particularly limited.

In order to make the main body A exhibit superelasticity at normal temperature,
The shape recovery temperature is set to 0 degree Celsius. The memory heat treatment that satisfies this condition is performed by processing the superelastic alloy in the shape of the main body A or holding the superelastic alloy before processing in a straight needle shape,
It is performed by heating to 400 to 500 degrees Celsius and maintaining the temperature for a certain period of time.

Since the main body A is made of a superelastic alloy, the main body A is deformed flexibly in response to an external force acting thereon, and the root canal wall is not excessively cut. Therefore, the treatment becomes extremely easy as compared with the cutting of the root canal wall by the main body A made of stainless steel. In addition, body A
When the body is detached from the root canal, the body A immediately returns to the shape of a straight needle, which is a memory shape.

The main body A is integrally joined to the shank B. The main body A and the shank B are preferably joined by caulking or bonding. That is, in the main body A that has been subjected to the memory heat treatment, the memory shape is lost when the temperature is increased to 600 degrees Celsius, so that it is not preferable to use a means such as welding. Therefore, a hole is previously formed in the shank B, the shaft portion 1 of the main body A is inserted into the hole, and the periphery of the hole is caulked.
Alternatively, the main body A and the shank B are integrally joined by bonding with an adhesive.

The shank B has a shape corresponding to the chuck shape of the handpiece to be mounted. In this example, as shown in FIG. 1, the body 11 of the shank B has a thickness that can be gripped by the chuck, and the rear end (the right side in FIG. 1) of the body 11 has a rotational force. A notch 12 through which is transmitted is formed. A groove 13 corresponding to the size of the main body A is formed in the body 11 over the entire circumference.

In the H file constructed as described above, the shank B is gripped by the handpiece operated by the dentist, the working part 2 of the main body A is inserted into the root canal, and the main body A is rotated, or the main body A is rotated. By rotating and pushing A, the root canal wall can be cut. Then, despite the rotation of the main body A, the working portion 2 does not bite into the root canal wall by the action of the non-spiral portion 2b at the tip of the working portion 2, and therefore, there is no possibility that the main body A is broken. For this reason, it becomes possible to perform the shaping of the root canal wall in a short time,
It does not force the patient.

Next, a method of manufacturing the main body A of the H file will be described with reference to FIG. As shown in FIG. 1A, a wire 21 as a material of the main body A is formed by grinding or the like into a straight portion 21a having a thickness and a length corresponding to the shaft portion 1 and a length corresponding to the working portion 2. In addition, a tapered portion 21b having a tip diameter and a taper set in advance is formed.

As shown in FIG. 3B, the grindstone 22 has an angle between these surfaces 3a and 3b so that a rake face 3a and a flank 3b of the blade 3 in the spiral blade portion 2a can be formed. It is formed in a tapered shape having substantially the same angle, and is rotated in one direction (the direction of arrow a) by a driving device (not shown). The wire rod 21 is rotatable in one direction (arrow b direction) and is movable in the axial direction of the wire rod 21 (arrow c direction).
23 is gripped. And grindstone 22 is straight part 21a
The grinding is started by rotating the grindstone 22 and the wire 21 in the directions of the arrows a and b to press the grindstone 22 against the wire 21 and simultaneously moving the wire 21 in the direction of the arrow c. Let it.

By continuing the grinding process on the wire 21 as described above, it is possible to form a spiral blade portion 2a composed of a plurality of blades 3 as shown in FIG. When the grinding corresponding to the length of the spiral blade portion 2a set in advance is completed, the rotation of the wire 21 is stopped while the rotation of the grindstone 22 is continued, as shown in FIG. By moving the wire 21 in the direction of the arrow c, it is possible to form the non-spiral portion 2b composed of the flat surface 4 and the cylindrical surface 5 on the tip side of the helical blade portion 2a.

The order of grinding when forming the working part 2 is not limited to the above order. The grindstone 22 is arranged at the front end side of the wire 21 and is brought into pressure contact with the wire 21 in the axial direction without rotating the wire 21. To form the non-spiral portion 2b first, and then rotate the wire rod 21 and simultaneously move it in the axial direction to form the spiral blade portion 2a.

[0051]

As described above in detail, in the dental treatment instrument according to the present invention, since the non-spiral portion formed by the flat surface and the cylindrical surface is formed at the tip of the working portion, this non-spiral portion is the root. No thrust is generated even when rotating in contact with the pipe wall. For this reason, the working portion does not bite into the root canal wall, and breakage due to this biting can be prevented. Therefore, the root canal can be cut by rotating the main body, the root canal can be formed in a short time, and the treatment can be easily and reliably applied without forcing the patient to suffer. I can do it.

Further, by forming the shaft portion constituting the main body integrally with the shank, the dental treatment instrument is gripped by a rotary drive device such as a handpiece, and the dental drive device is rotated by driving the device, thereby rotating the root canal wall. Can be cut. For this reason, the operation of the dentist becomes easy, and accurate and rational treatment can be performed.

In the method for manufacturing a dental treatment instrument according to the present invention, a whetstone formed so that a rake face and a flank can be formed is pressed against a wire, and the wire is rotated and simultaneously moved in the axial direction. Thus, a non-spiral portion can be formed by stopping the rotation of the wire and moving the wire in the axial direction. Therefore, the helical blade portion and the non-spiral portion can be processed in one step.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of an H file.

FIG. 2 is a diagram illustrating a configuration of a working unit, and is a diagram of a non-spiral portion viewed from a side.

FIG. 3 is a diagram illustrating a configuration of a working unit, and is a diagram illustrating a non-spiral portion as viewed in plan.

FIG. 4 is a diagram illustrating a configuration of a working unit, and is a diagram of a non-spiral portion viewed from a distal end side.

FIG. 5 is a diagram schematically illustrating a method of manufacturing an H file.

FIG. 6 is a cross-sectional view illustrating a configuration of a conventional H file.

[Explanation of symbols]

 A body B shank 1 shaft part 2 working part 2a spiral blade part 2b non-spiral part 3 blade 3a rake face 3b flank 3c cutting edge 4 flat surface 5 cylindrical surface 6 edge 7 axis 8 of blade 3 adjacent to non-spiral part 2b Bottom 11 Body 12 Notch 13 Groove 21 Wire 21a Straight 21b Taper 22 Grinding stone 23 Chuck

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61C 5/02

Claims (2)

(57) [Claims] A working portion having a predetermined tip diameter and a taper formed continuously with the shaft portion and formed at a predetermined length from the shaft portion side of the working portion. A dental blade, comprising: a spiral blade portion; and a non-spiral portion formed of a flat surface and a cylindrical surface formed between a distal end of the spiral blade portion and a distal end of the working portion. Therapeutic instruments. 2. A wire rod comprising a straight portion corresponding to a shaft portion and a portion having a predetermined tip diameter and a taper corresponding to a working portion is formed to form a rake face and a flank of a target dental treatment instrument. A whetstone formed so that it can be pressed against a position corresponding to the working portion of the wire, and the wire is moved in the axial direction while rotating to form a spiral blade portion constituting the working portion, and rotation of the wire is performed. A method for manufacturing a dental treatment instrument, comprising stopping and moving in an axial direction to form a non-spiral portion.