JPH1085243A - Working length setting tool for dental root canal forming instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve miniaturization by enabling the working lengths of the needles of numerous dental root canal forming instruments to be rapidly set at the same length, and enabling the needles to be preserved (aligned) in order in a line. SOLUTION: A plurality of through holes 1b through which the needle parts of dental root canal forming instruments can be passed are bored in a straight line in the upper surface 1a of an upper base to which the lower surface of a rubber stopper abuts, the upper base 1 constituting at least a portion of the upper surface of a casing 2 taking the form of a rectangular solid. A lower base 3 having an upper surface 3a which is parallel to the upper surface la of the upper base 1 and to which the end of the needle part of each dental root canal forming instrument abuts is supported by two or more supports 4, 5 being perpendicular to the upper surface 1a of the upper base 1 and placed parallel to each other inside the casing 2, and an internal thread 3b cut in the lower babe 3 is fitted over an external thread 4b cut on the outer peripheral surface of the rotating support 4 freely rotationally attached to the casing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental root canal forming instrument such as a reamer or a file used in the treatment of a medulla or an infected root canal used in dental treatment. The present invention relates to a working length setting tool for a dental root canal forming instrument for making the working position of a blade portion of a needle portion uniform by setting the same mounting position of a rubber stopper to be mounted on the needle.

[0002]

2. Description of the Related Art In daily clinical practice of dental treatment, when performing root canal enlargement or root canal formation of a tooth as a treatment for pithing or infected root canal, a physical (using equipment) treatment is a dental root canal. Tube forming devices are commonly used. Among various types of dental root canal forming instruments for this procedure, in particular, Reamer,
An H file and a K file (hereinafter, these three types may be collectively referred to as a root canal forming tool) are widely used. These root canal forming tools consist of a handle portion made of resin and a needle portion mainly made of stainless steel wire or hard steel wire. The needle portion has a predetermined length (e.g., for cutting or other work). (Defined as a minimum of 16 mm). Further, the length and thickness of the needle portion and the color of the pattern portion (the color arrangement is determined according to the thickness of the needle portion) are defined in ISO and JIS.

[0003] In a root canal enlarging treatment in dental treatment performed using such a root canal forming tool, necrotic tissue pieces and food pieces of nerve tissue existing in a root canal of a tooth are removed. The purpose of this procedure is to expand the root canal while gradually changing the root canal forming tool from a thin one to a thick one as the treatment progresses. At this time, generally, the reamer is first inserted into the root canal, and an X-ray photograph or a radiograph is used for the purpose of confirming the working length of the blade portion of the needle portion (hereinafter sometimes simply referred to as working length). Check the root canal length and apical position using a root canal meter (a root canal length measuring device using electrical resistance) and a value slightly shorter than the measured value (position about 1 mm away from the apex) Is used as the working length of the root canal forming tool, and the stopper with the mark of the set length (mainly made of rubber material Therefore, it is referred to as rubber stopper in the following) and used by attaching to each root canal forming tool.

[0004] Such a root canal forming tool is sold with a rubber stopper attached thereto in advance, or the root canal forming tool and the rubber stopper are sold separately. In general, rubber stoppers are used at low cost because they have a special shape and color so that they can be used properly according to the type and thickness of the root canal forming tool, and these are used. In some cases, the rubber plate is appropriately cut into a desired shape and size and attached to a root canal forming tool to be used as a rubber stopper. In any case, the rubber stopper is attached to the root canal forming device and used in the oral cavity, so that the patient's saliva and blood adhere to it.If it is reused, it can be disinfected to prevent infection. Although it is required, it is difficult to disinfect because the through-hole for inserting the needle is small and the material has elasticity, so that the through-hole is easy to be closed. Is common.

[0005] In a clinical practice, an operator usually treats the root canal of a single tooth, as described above, by sequentially changing the thickness of the root canal forming tool and performing an enlarging treatment. As a result, in a single treatment, 12 to 24 root canal forming devices are used in the case of a single root. When such treatment is repeated a plurality of times, a large number of root canal forming tools such as [(12 to 24) × the number of treatments] are required in total.
In order to perform this procedure well, it is essential to prepare in advance according to the schedule of the day, and this is an important task of assistants such as hygienists.

However, even when a rubber stopper is attached to a root canal forming tool in advance and sold, the rubber stopper attached to the root canal is not matched with the root canal length of a tooth to be treated for an individual patient. Absent. Therefore, each time a procedure is performed, an operator or an assistant uses a jig for adjusting a root canal length (sometimes called an end gauge),
It is necessary to move the rubber stopper in each of the many root canal forming tools as described above to exactly match the working length based on the above measurement results. And the root canal forming tool whose rubber stopper is set to the predetermined working length,
They had to be marked with markers (such as the patient's name and length) so that they could not be mixed with others, and kept in a special container. Therefore, the task of adjusting the working length of the root canal forming tool according to the mounting position of the rubber stopper has been a troublesome and troublesome task.

[0007] In order to solve such a problem, for example, as disclosed in Japanese Patent Publication No. 53-25440, the "necessary length" of the measurement result as described above has been proposed. A device that sets the working length of the root canal forming tool based on the mounting position of the rubber stopper based on the
A device used for such a purpose may be referred to as a setting device). That is, the setting device, according to the publication, states that "the required length of the reamer can be quickly and accurately determined for all sets of reamers arranged in an appropriate dimension (diameter) order. I can decide. "
It is a working length determination holding device.

[0008] In the case where the apparatus has "a column extending upward from the substrate and a member for locking the holding plate at a selected position on the column" as in the operation length determination holding device, ,
When setting the desired interval, the operation is easy, but
As the root canal prosthesis is used sequentially, the column protruding in the center is in the way, or the “pinch” provided at the upper end of the column for the use of the opposite root canal prosthesis is not necessary. There is a possibility that the screw may rotate due to the holding, and the distance between the substrate and the holding plate may change from the set position. Also,
After the predetermined interval is set, there is a possibility that a third party may inadvertently touch the “knob” at the upper end to change the set interval. FIG. 3 of Japanese Patent Publication No.
"Bumper spring" as in another embodiment shown in
In the case of a combination of a screw and a "lock screw", if the screw is not properly locked, the position of the holding plate easily changes, and it is not preferable because the change may not be noticed. is there.

Incidentally, it is needless to say that it is preferable that once the surgeon starts the treatment of the root canal, the treatment can be continued without taking his eyes off the patient's mouth as much as possible. However, in the case where various root canal forming tools are arranged in a plane as a setting device, it is necessary to confirm a desired root canal forming tool one by one with eyes. There is a drawback that the continuous hand movement of the operator is interrupted. This is the handle of the root canal forming tool (generally referred to as the handle).
When there is a projection on the plane (for example, the central column corresponds to the working length determining and holding device described above), this becomes an obstacle, and is further expanded in a plane. Therefore, it is difficult to remember the arrangement of the root canal forming tool on the plane, and it is necessary to visually confirm the arrangement. In addition, easily changing the set interval at an unintended time impairs the reliability of the operation and is harmful to treatment.

In addition, there are various restrictions on the size and shape of these setting devices, for example, various equipments are provided on a tray table provided in a dental unit, and the available empty space is not so large. There is a restriction derived from this. Problems due to this restriction include the following. That is, a single tooth may be of a two-root canal type, such as an upper first premolar or a second premolar, or a three-root canal, such as a lower molar. When treating multiple root canals of a single tooth, it is preferable to proceed simultaneously for each root canal, but if the length of the root canals is different, it is necessary to treat all root canals In this method, a plurality of root canal forming tools having different working lengths must be prepared at the same time. Therefore, since a plurality of root canal length setting devices may be placed on a narrow tray table, it is difficult to use a circular device that occupies a large area and cannot be miniaturized as in the above-described conventional setting device. Will occur. In addition, it must be taken into consideration that the setting device needs to be shaped so that it can be efficiently sterilized even in a small sterilization room, in case the entire setting device is sterilized by a sterilizer.

Further, when the working lengths are made uniform, there is another problem that it is difficult to set an accurate length because the needle portion is easily bent in a root canal forming tool having a thin needle portion. When using a sterilized root canal forming tool, the rubber stopper is disposable as described above, so the assistant should attach a new rubber stopper to the needle in advance before treatment. Must. However, in a configuration in which the rubber stopper arranged at a predetermined position of the setting device easily moves from that position, there is a problem that the operability is poor because the assistant takes time to attach the rubber stopper.

[0012]

SUMMARY OF THE INVENTION According to the present invention, an interval for setting the working length of a root canal forming tool according to an attachment position of a rubber stopper can be easily set, and the interval set at an unintended time can be easily changed. Once the working length is set, many root canal forming tools can be quickly aligned to the same working length and stored (arranged) as it is. There are no protruding obstacles on the upper surface where the handle of the shaping tool is located, and furthermore, each of the shaping tools can be grasped without the operator visually checking the desired root canal shaping tool during the procedure. Provided is a working length setting tool for a dental root canal forming instrument that can be miniaturized, in which root canal forming tools are arranged in a line in a row, and that does not create useless space when a plurality of root canal forming tools are arranged. That is the task.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above problems, and as a result, have found that a rectangular parallelepiped box,
A plurality of through holes of a predetermined size, which constitute at least a part of the upper surface of the box and through which the needle portion of the root canal forming tool can be inserted, are formed in a straight line, and the needle portion is inserted into the through hole. An upper substrate on which the lower surface of the rubber stopper attached to the needle portion is in contact with its upper surface when inserted, and an upper surface parallel to the upper surface of the upper substrate and in contact with the tip of the needle portion of the root canal forming tool And the lower substrate is supported by two or more pillars that are perpendicular to the upper surface of the upper substrate and that are erected in parallel with each other in the box body, and rotate with the box body. A male screw provided on the lower substrate is screwed into a male screw threaded on the outer peripheral surface of the rotatable support column, and the lower substrate is moved up and down by rotating the rotatable column. The working length of the blade at the needle of the root canal forming tool is It had completed the present invention by paying attention to may be configured to be capable to be held by setting the interval of a desired length between the upper surface and the lower upper surface of the substrate.

In the above-described configuration,
A flat bottom is provided around the through hole of the upper substrate for arranging the rubber stopper, and the upper substrate is configured to be detachable from the box body, or the working length of the blade portion of the needle portion of the root canal forming tool is set to the lower substrate. It was also found that it would be more preferable to dispose a measuring tool for reading at the position of the box on the front side surface of the box.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The working length setting tool for a dental root canal forming tool according to the present invention will be described below in detail with reference to the drawings. 1 is a perspective explanatory view showing the arrangement and configuration of each element of a working length setting tool for a dental root canal forming instrument according to the present invention, and FIG. 2 is a work for a dental root canal forming tool according to the present invention. FIG. 3 is an enlarged perspective view showing another embodiment of the detachable upper substrate in the length setting tool and one embodiment of the chain rubber stopper, FIG. 3 is an enlarged right side view in FIG. 1, and FIG. It is an arrangement explanatory view explaining the situation in the case of setting the working length of the root canal forming tool in one embodiment of the working length setting tool for root canal forming tool.

In the drawings, reference numeral 1 denotes an upper substrate having a flat upper surface 1a with which the lower surface of the rubber stopper 8 attached to the needle portion 7b of the root canal forming tool 7 is brought into contact. At a predetermined position on the upper surface 1a of the upper substrate 1, the 19 kinds of needles 7 of the root canal forming tool 7, which is currently frequently used in clinical practice, are provided.
The thickness of b (“010” to “140” in the type defined in JIS T 5211 “Dental root canal K file” and JIS T 5212 “Dental root canal H file”)
The through-hole 1b of a predetermined size (about 0.8 to 2.0 mm), which can be inserted through the upper surface, corresponds to all of the thickness of the handle 7a. It is drilled at a right angle to 1a.

The reason why the size of the through hole 1b of the upper substrate 1 is set as described above is that the needle portion 7b of the root canal forming tool 7
This is because there are various thicknesses. For example, J
In the file specified by IS, the thinnest “01”
In the case of “0”, the virtual diameter of the blade tip d ₀ is 0.10 mm, and the diameter d _{16 of the 16} mm portion from the blade tip is 0.42 mm in diameter, and in the case of the thickest “140”, the virtual diameter of the blade tip d ₀ Is 1.40 mm, and the diameter d _{16 of the} portion 16 mm from the tip of the blade portion is 1.72 mm. Therefore, if a plurality of through-holes 1b having a hole diameter in the above-described range are prepared arbitrarily, it is possible to correspond to the root canal forming tool 7 of any manufacturer and to use it properly according to the thickness.

Further, as described above, in the case of a single root in a single treatment, 12 to 24 root canal forming tools 7 are used. It is desirable that the substrate 1 be provided with 6 to 12 through holes 1b. However, if the number of the through holes 1b is set to about 6 rather than various ones, it can be used universally, and the whole apparatus can be arranged in a size that does not occupy much space. It is preferable because it becomes easier. On the back surface of the upper substrate 1, an auxiliary cylinder 1e having a conduit having the same size as or slightly thicker than the diameter of the through hole 1b is provided downward coaxially with the through hole 1b. Is also good. This is because when the thickness of the needle portion 7b is small as in the case of "010" described above, the needle portion 7b is easily curved at an intermediate portion thereof, so that it may be difficult to set an accurate working length. It corresponds. Therefore, it is preferable that the auxiliary cylinder 1e is provided, since the working length of the thin needle portion 7b can be set without worrying about bending as in the case of the thick needle portion 7b.

Further, it is preferable to provide a recess 1c having a flat bottom surface for arranging the rubber stopper in a shape conforming to the contour of the rubber stopper 8 around the through hole 1b of the upper substrate 1 because the usability is further improved. This is because if the rubber stopper 8 is positioned in the recess 1c, the rubber stopper 8 can be prevented from being displaced. Therefore, it is not necessary to hold the rubber stopper 8 with a finger or the like so that the rubber stopper 8 does not move. This is because the upper substrate 1 can be reliably inserted into the through hole 1b at the same time as when the stopper 8 is inserted into the through hole. When the depression 1c is provided in this manner, the bottom surface of the depression 1c corresponds to the upper surface 1a in the description so far.

Reference numeral 2 denotes a rectangular parallelepiped box. The upper substrate 1 constitutes at least a part of the upper surface of the box. Even if the upper substrate 1 is integral with the box 2, it is detachable. Is also good. In the box 2, two or more columns 4, 5 are erected perpendicularly to the upper surface 1 a of the upper substrate 1 and parallel to each other, and are rotatably mounted on the box 2. A male screw 4b is screwed on the outer peripheral surface of the support column 4.

The box 2 has a flat bottom surface so that it can be placed on a tray table provided in a dental unit. Or the lower portion of the sliding support 5 projects below the bottom surface and is supported by the lower surface of these projections and the lower surface of the leg 2a projecting from the bottom surface of the box 2. It may be.

A lever or knob 4a is integrally provided at a predetermined position on the rotary support 4 so that the rotary support 4 can be rotated with respect to the box 2, or the upper surface of the rotary support 4 is provided. Is exposed on the upper surface of the box 2, a slot, a hexagonal hole, or the like may be provided on the upper surface so that the upper surface can be rotated by a driver.

Reference numeral 3 denotes a needle portion 7 of the root canal forming tool 7 which is parallel to the upper surface 1a of the upper substrate 1 (which may be a bottom surface in the depression 1c).
b is a lower substrate having an upper surface 3a with which the tip abuts. The lower substrate 3 is composed of two or more columns 4 and 5 erected perpendicularly to the upper surface 1a of the upper substrate 1 and parallel to each other in the box body 2.
A female screw 3b supported by the (rotating support 4 and the sliding support 5) and screwed to a male screw 4b screwed on the outer peripheral surface of the rotating support 4 rotatably attached to the box body 2. Since the rotating column 4 is rotated, the sliding hole 3c of the lower substrate 3 moves up and down along the sliding column 5 so that the blade portion of the needle portion 7b of the root canal forming tool 7 is rotated. Can be set as a predetermined distance between the upper surface 1a of the upper substrate 1 and the upper surface 3a of the lower substrate 3. That is, since the working length of the blade portion of the needle portion 7b of the root canal forming tool 7 is the length from the tip of the needle portion 7b to the lower surface of the rubber stopper 8, the length is equal to the above-mentioned interval. . That is, if this interval is set to a desired length, the working length of the blade portion of the needle portion 7b of the root canal forming tool 7 is automatically determined to that length.

Reference numeral 6 denotes a measuring tool which is preferably disposed at a position on the front side surface of the box 2 where the side surface of the lower substrate 3 can be seen. The work length of the blade portion of the needle portion 7b of the root canal forming tool 7 can be confirmed by reading the position of the upper surface 3a of the lower substrate 3 from the scale 6a provided on the measuring tool 6, or by determining the desired length. This is because it is possible to set the working length. In addition, it is preferable to use a transparent material or to dispose the measuring tool 6 on the left and right sides of the box 2 because the usability is further improved.

Next, the working length setting tool for a dental root canal forming instrument according to the present invention, in which the upper substrate 1 is detachably attached to the box 2, will be described with reference to FIGS. 1, 2 and 3. FIG. Rubber stoppers 8 having various shapes and colors are commercially available. This is as described above for the root canal forming tool 7
The reamer, the H file and the K file are properly used depending on the purpose and use, and various thicknesses are prepared, and the pattern portion 7a is colored for identification.
This is to make these identification easier. Under such circumstances, the upper substrate 1 in the box 2 is detachable, and it is preferable that the upper substrate 1 be replaceable in accordance with the shape of the rubber stopper 8 (for example, a round shape, a square shape, a bud shape, etc.). . This is because, for example, the difference in the shape of the rubber stopper 8 and the difference in the root canal forming tool 7 can be identified without checking the needle portions 7b of the reamer, the H file, and the K file, so that only the upper substrate 1 is replaced. And box 2
Through hole 1b according to the treatment situation of each patient
This is because it is possible to use the one having a different size and the shape of the depression 1c, and it is not necessary to prepare and place many dedicated boxes 2 occupying a larger space than the upper substrate 1.

As an example of a structure for making the upper substrate 1 detachable from the box body 2, as shown in FIG. 2, the upper substrate 1 has a trapezoidal cross section (the upper side is shorter than the lower side). ,
One end has a retaining projection 1 for retaining and maintaining the position.
d and 1d are deployed. The upper substrate 1 is provided in the box 2.
A vertically long dovetail groove having a horizontal shape that matches the shape of the horizontal cross section is provided. When the upper substrate 1 is mounted in the dovetail groove, a state as shown in FIG. 1 is obtained. However, the dovetail groove does not necessarily need to be configured to penetrate to the opposite side. On one side surface of the box body 2 (the right side surface is shown as an example in FIG. 3), a notch for fitting with the stopper projection 1d is provided. With such a configuration, the upper substrate 1 is
Even if it is turned upside down, the position can be maintained without falling out or piercing to the left side.

In addition, in case that an auxiliary cylinder 1e is provided as an auxiliary for the thin root canal forming tool 7 on the upper substrate 1, as shown in FIG. A U-shaped notch in the figure) may be provided. Thus, even if the upper substrate 1 with the auxiliary cylinder 1e is used,
It can be attached to

In the working length setting tool for a dental root canal forming tool according to the present invention, not only when the rubber stopper 8 is attached to the needle 7b of the root canal forming tool 7 in advance but also the root canal forming tool 7 is used. When the rubber stopper 8 is newly attached to the needle portion 7b, the rubber stopper 8 may be a chain-shaped rubber stopper 8a as shown in FIG. 2 or an individual rubber stopper which has been distributed as shown in FIGS. 8
Any of b can be used. In particular, in the case of the chained rubber stopper 8a shown in FIG. 2, since the through holes 1b are formed in the upper substrate 1 in a straight line, a plurality of rubber stoppers 8 can be arranged at a predetermined position at one time. Preferred. In the case of the chain-shaped rubber stopper 8a, the chain portion is cut (when the root canal forming tool 7 is used) (the chain portion may be easily torn off or cut using a cutter or the like). is there.

A method of using the working length setting tool for a dental root canal forming tool according to the present invention having the above-described structure will be described with reference to FIGS. As described above, first, the reamer in the root canal forming tool 7 is inserted into the root canal,
In order to set the working length of the blade portion of the needle portion 7b of the root canal forming tool 7, the root canal length is measured and confirmed with an X-ray photograph or a root canal meter. At this time, the obtained data (root canal length) is digitized (length in mm), or the individual rubber stopper 8b is positioned at a position of an appropriate working length in a reamer previously inserted into the root canal.

When the working length is obtained as a numerical value, the rotary support 4 is rotated by using the knob 4a to translate upward or downward, so that the upper surface 3a of the lower substrate 3 is disposed on the box 2. The scale 6a of the tool 6 is read at a position corresponding to the numerical value of the working length (the state of the lower substrate 3 with respect to the measuring tool 6 in FIG. 4). When using the reamer itself used for measuring the working length, the lower substrate 3 is previously positioned so as to be slightly shorter than the working length.
Thereafter, the reamer is inserted into the through hole 1b, and the rotary support 4 is rotated using the knob 4a to lower the lower substrate 3 until the lower surface of the individual rubber stopper 8b contacts the upper surface 1a (or the bottom surface of the depression 1b). Then, the reading of the scale 6a on the measuring tool 6 on the upper surface 3a of the lower substrate 3 at this time is set as an appropriate numerical value of the working length.

Thereafter, when the chain-shaped rubber stopper 8a or the individual rubber stopper 8b is previously attached to the needle portion 7b of the root canal forming tool 7 (hereinafter, simply referred to as rubber stopper 8 because the procedure is the same). Inserts the needle portion 7b of the root canal forming tool 7 into the through hole 1b of the upper substrate 1 as it is, and continues the insertion until the tip of the needle portion 7b of the root canal forming tool 7 contacts the upper surface 3a of the lower substrate 3. (It is an explanatory view of a state where the individual rubber stopper 8b is attached to the needle portion 7b of the root canal forming tool 7 in FIG. 4).

When the rubber stopper 8 is attached to the needle portion 7b of the root canal forming tool 7 in advance, the length is often different from the set working length, and the attachment position is set. There are cases where the working length is shorter and longer than the working length. However, when the length is short, only the root canal forming tool 7 may be further pushed down while the lower surface of the rubber stopper 8 is in contact with the upper surface 1a (or the bottom surface in the depression 1c). In the case of a long length (the needle portion 7b of the root canal forming tool 7)
Can be easily confirmed by looking at the measuring tool 6), and the rubber stopper 8 is pushed down with a finger or tweezers or the like so as to come to a position slightly shorter than the preset working length. By performing such an operation, it is possible to easily adjust to the predetermined working length in the same manner as in the above-described short case.

Next, a case where the rubber stopper 8 is newly attached will be described. New rubber stopper 8
By the required number of upper surfaces 1a (or depressions 1c) of the upper substrate 1.
After that, the needle portion 7b is inserted into a through hole provided in the rubber stopper 8 in advance. At this time, if there is no mark such as a depression 1c on the upper surface 1a of the upper substrate 1,
Care must be taken so that the through-hole 1b of the upper substrate 1 is located immediately below this through-hole, but when the recess 1c is provided, the needle 7b of the root canal forming tool 7 is automatically inserted into the through-hole 1b. You don't need to be careful about the position. In other respects, the procedure may be the same as in the case where the rubber stopper 8 is attached to the needle 7b of the root canal forming tool 7 in advance and the working length is shorter than the set working length.

[0034]

As described above in detail, the working length setting tool for a dental root canal forming instrument according to the present invention can be used to rotate the rotating column using a lever or a knob. The combined lower substrate moves up and down in parallel with the upper surface of the upper substrate in accordance with the rotation of the rotating column. That is, the interval for setting the working length at the blade portion of the needle portion of the root canal forming tool can be easily set by this vertical movement. That is, in the case of using the reamer itself used for the measurement of the root canal length or in the case of digitization, the working length setting is performed by the same operation in the working length setting tool for a dental root canal forming instrument according to the present invention. It can be done easily.

Once the interval is set to the predetermined working length, the mechanism for changing the interval is provided in the box or the leg (lower portion), and may be inadvertently touched. There is almost no danger of movement due to touch with other equipment. Moreover, once the working length is set, many root canal forming tools can be quickly adjusted to the same working length, and the root canal forming tools with the set working length can be stored (arranged) as they are. Therefore, special storage containers are not required.

Further, there is no inadvertently touching object such as a protruding obstacle or the like on the upper surface on which the handle portions of the root canal forming tool are located and arranged. In the working length setting tool for a dental root canal forming instrument according to the present invention, the stem portions of the root canal forming tool are arranged in a line in a straight line, and as described above, there is no obstacle on the upper surface. Since there is no object at all, it is possible to make a habit so that the surgeon can obtain the desired root canal forming tool at the time of treatment without having to check it at a glance.

Further, the working length setting tool for a dental root canal forming instrument according to the present invention has a rectangular parallelepiped shape and a size of about six root canal forming tools (for example, 25 mm long × 60 mm wide). (Height of about 50 mm) is sufficient, so that miniaturization is possible. Moreover, since a rectangular parallelepiped shape is formed when a plurality of cells are arranged, no wasteful space is generated, and processing such as sterilization is well performed. In addition to being able to do it, it can be placed neatly on shelves when not in use.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing the arrangement and configuration of each element of an embodiment of a working length setting tool for a dental root canal forming tool according to the present invention.

FIG. 2 is an enlarged perspective explanatory view showing another embodiment of the detachable upper substrate and one embodiment of the chain-shaped rubber stopper in the working length setting tool for a dental root canal forming instrument according to the present invention.

FIG. 3 is an enlarged explanatory diagram of a right side surface in FIG. 1;

FIG. 4 is a layout explanatory view illustrating a situation in which the working length of the root canal forming tool is set in one embodiment of the working length setting tool for a dental root canal forming tool according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper board 1a Upper surface 1b Through hole 1c Depression 1d Stop projection 1e Auxiliary cylinder 2 Box body 2a Leg 3 Lower board 3a Upper surface 3b Female screw 3c Sliding hole 4 Rotating support 4a Knob 4b Male screw 5 Sliding support 6 Measuring tool 6a Scale 7 Root canal forming tool 7a Handle 7b Needle 8 Rubber stopper 8a Chain-shaped rubber stopper 8b Individual rubber stopper

Claims (3)

[Claims] 1. A rectangular parallelepiped box (2) and at least a part of the upper surface of the box (2), through which a needle (7b) of a dental root canal forming instrument (7) can be inserted. A plurality of through holes (1b) having a predetermined size are formed in a straight line, and a rubber stopper attached to the needle portion (7b) when the needle portion (7b) is inserted through the through hole (1b). The lower surface of (8) is the upper surface (1a)
The upper substrate (1) contacting the upper substrate (1) and the upper surface (1) of the upper substrate (1)
a) a lower substrate (3) having an upper surface (3a) parallel to a) and abutting the tip of a needle (7b) of the dental root canal forming device (7), wherein the lower substrate (3) is Upper surface (1a) of the upper substrate (1)
And is supported by two or more columns (4, 5) standing upright in the box (2) and parallel to each other in the box (2).
A female screw (3b) provided on the lower substrate (3) is screwed into a male screw (4b) screwed on an outer peripheral surface of the rotary support (4) rotatably mounted on the lower substrate (3). By rotating the rotating column (4), the lower substrate (3) is moved up and down in parallel to move the needle portion (7) of the dental root canal forming instrument (7).
The working length of the blade portion in b) is changed to the upper surface (1) of the upper substrate (1).
a) and an upper surface (3a) of the lower substrate (3) can be set and held at an interval of a desired length, for a dental root canal forming instrument. Working length setting tool. 2. A recess (1c) having a flat bottom surface for arranging rubber stoppers is provided around the through hole (1b) of the upper substrate (1), and the upper substrate (1) is a box (2). The working length setting tool for a dental root canal forming instrument according to claim 1, wherein the working length setting tool is configured to be detachably attached to the instrument. 3. A measuring tool (6) for reading the working length of a blade portion of a needle (7b) of a dental root canal forming instrument (7) according to the position of a lower substrate (3) is a front side surface of a box (2). The working length setting tool for a dental root canal forming tool according to claim 1 or 2, wherein the tool is set in a tool.