JP7369366B2 - Cap and reciprocating generator for root canal treatment with this cap - Google Patents

Description

The present invention relates to a vibrating cylinder of an electric reciprocating motion generator for cleanly treating cavities by generating reciprocating motion in a file electrically, a reciprocating motion generator equipped with the vibrating barrel, The present invention also relates to a cap attached to a vibrating cylinder. Note that the term "file" as used in the present invention includes a file for filing and a reamer for reaming, but the present invention includes therapeutic tools similar to these. It also relates to a dental device for reciprocating a plugger or similar rod to apply pressure to a dental filling.

2. Description of the Related Art When a dentist performs root canal treatment for a patient's tooth decay, it is common to use a cutting tool called a file. The file includes a file and a reamer, and the file is named after filing (up and down movement) and the reamer is named after reaming (twisting). The handles of these items are color-coded or have symbols or numbers written on them, depending on the purpose and size. Also, items that are handled by hand are called hand files. There are also different thicknesses of the handles. Note that a root canal length measuring device is often used in conjunction with such root canal treatment. Root canal filling is a treatment in which the cavity of the tooth after the nerve has been removed is tightly filled with a root canal filling material such as waxed floss or gutter perture to prevent reinfection. Regarding the method of treating dental nerves as described above, the article on the Internet site of Non-Patent Document 1 is easy to understand. Regarding root canal filling treatment, the article on the Internet site in Non-Patent Document 2 is easy to understand.

The present inventor has developed Japanese Patent Application No. 2018-558447 as an electric reciprocating motion generator as described above. This device consists of a casing, a reciprocating motion generator housed within the casing, and a file attaching/detaching section provided in the reciprocating motion generator. It is necessary to hold the thin and small file with your fingertips to operate it. The idea was to eliminate this and make this operation happen automatically. When a file is attached to the attachment/detachment portion, the needle portion of the file protrudes from the tip of the reciprocating motion generating portion to perform reciprocating motion. This development has made it easier to enlarge and clean the root canal of a tooth and remove the nerve, which has the effect of reducing dentist fatigue and maintaining concentration. be.

Patent application 2018-558447 Internet WWW site <URL: http://mushiba-labo. com/? p=10133> Internet WWW site <URL: http://www. is-dc-m. net/pages/root. html>

For example, when attaching a file to the patent application No. 2018-558447, it would be fine to attach a file to the reciprocating motion generating section exclusively for this reciprocating motion generating section, but as a dentist, you can use a commercially available file as is. I feel that it is easier to use if you can wear it because you are used to it.

By the way, as mentioned above, although the electric reciprocating motion generator is excellent, it is difficult to open the patient's mouth during treatment, and there are special circumstances such as the shape of the mouth at that time, the doctor's posture, and the location of the cavity. However, if the length of the needle of the file protruding from the tip of the reciprocating motion generator was shorter, it would be easier to maneuver the file in the patient's mouth and to deal with difficult angle root canals. There is always something to think about. This also applies to other dental treatments such as root canal filling.

Another aspect of ease of use is that if files with two different handle thicknesses can be used with one electric reciprocating motion generator, the choice of files can be expanded. Even if there are two types of files with handle thicknesses that doctors are accustomed to, it can be handled.

If these problems could be solved, dentists' work would become easier and less tiring. Therefore, the object of the present invention is to solve the above-mentioned problems, and the first object is to enable an electric reciprocating motion generator to shorten the length of the needle part of the file according to the treatment situation. The second objective is to enable the electric reciprocating motion generator to use files with two types of handle thickness depending on the treatment situation.

The first problem mentioned above is that the vibrating tube is equipped with a mounting part for the file shaft, and has needle insertion holes for the file needle on both sides of the vibrating tube in the direction of reciprocating file movement. The needle is configured so that it can be attached to the attachment part by changing its direction, and the length of the needle that exits from the needle passing hole on one side and the needle passing hole on the other side is different. This is achieved by using a vibrating cylinder of a reciprocating motion generator for root canal treatment.

Up to now, as described above, the file needle has been configured to protrude only from the tip of the reciprocating motion generating section. In contrast, in the present invention, if the tip of the reciprocating motion generating section is on one side, the file needle can also be made to protrude from the rear end of the reciprocating motion generating section on the other side. . This allows the doctor to choose which side the needle should face when attaching the file to the attachment part.

Moreover, since the needle passing hole on one side and the needle passing hole on the other side are configured so that the length of the needle that comes out from the needle passing hole is different, the length of the needle required for the treatment to be performed is can be selected. For example, normally the file is attached to the mounting part so that the needle protrudes from the tip of the reciprocating motion generating part, but if a situation arises where it is easier to handle the file if the needle is shorter, then This means reinstalling the needle in the opposite direction, towards the rear end. Therefore, in this case, the length of the needle passage hole on the rear end side may be designed to be longer than the length of the needle passage hole on the front end side. As a result, not only a file dedicated to the present invention but also a commercially available file can be used by changing the length of the needle into two types, so that it can be used as two needles.

By the way, regarding the mounting of the file to the mounting section, the shaft section of the file may be mounted to the mounting section through a mounting opening opened in the side surface of the vibrating cylinder. When attaching the shaft to the mounting opening, first pass the file needle through the needle hole on the tip side of the vibrating barrel, or through the needle hole on the rear end side, and then insert the file needle into the file shaft. Attach the part to the mounting opening. Regarding the vibration-side casing of the electric reciprocating motion generator, it is important to note that the mounting opening for the file shaft should be opened in the vibration-side casing as well, aligning the position with the mounting opening of the vibration tube. It is necessary to keep it.

With this configuration, the file can be easily installed by pushing the file shaft into the vibrating tube through the mounting opening, and when removed, the file can be pulled out by hooking your fingertips into the recess in the file shaft. Just do it. Therefore, it is easy and convenient to attach and detach files from the side wall of the vibrating cylinder.

Furthermore, since the needle passing hole on the tip side of the vibrating cylinder and the needle passing hole on the rear end side are configured to have different lengths, the length of the needle passing through the needle passing hole is different. The length will be different between the front end and the rear end. Therefore, the needle of the file is passed through any of the needle holes so that the desired needle length is obtained, and then the shaft portion of the file is installed in the installation opening. That is, by simply changing the direction of the needle and attaching it, the needle length on the other side can be made shorter than the needle length on one side.

The next step is to attach the file to the attachment part.There is a needle hole on one side of the vibrating cylinder, and an attachment opening for the file shaft on the other side, and the file is fixed in this attachment opening. A cap is removably attached to the cap to allow the needle to pass through the needle, and the cap may have a needle hole on the other side. What is noteworthy about this configuration is that the cap has a needle hole on the other side. In addition, in order to make the length of the needle that comes out of the needle hole on one side and the needle hole on the other side different, it is necessary to make the length of the needle hole different. be.

With this configuration, the needle length on the other side can be easily and easily made shorter than the needle length on one side by simply changing the direction of the needle on the file, attaching it, and fixing it with the cap. It is.

Note that here, the cap has a needle passage hole on the other side, and such a cap is configured to be attached to the attachment opening of the attachment part, but the cap with the needle passage hole on the other side is the same as above. It doesn't have to be something that can be called a cap. For example, the attachment part may be divided into a front side and a rear side, which can be attached and detached with screws, and the length of the needle insertion hole may be different between the front attachment part and the rear attachment part. What is necessary is to provide different needle holes.

Next, the second problem mentioned above is that the vibrating barrel is equipped with a mounting part for the file shaft, the needle insertion hole is on one side of the vibrating barrel, and the mounting opening for the file shaft is on the other side. A cap for fixing the file is removably attached to the opening, and the bottom of the screwed-in part of the cap is an abutting part approximately the width of the handle of the thick-handled file. At the same time, this can be achieved by using a vibrating cylinder of a reciprocating motion generator for root canal treatment, which has an insertion hole the width of the handle of a thin file at the corresponding contact part.

Until now, only one type of file could be attached to the vibrating cylinder and the cap, but now two types of files with different handle thicknesses can be attached. For files with thick handles, the bottom of the cap will abut the top of the thick handle. Alternatively, for a file with a thin handle, the insertion hole at the bottom of the cap will accept the thin handle by inserting the thin handle. It should be noted that the difference in the length of the handle of the file can be absorbed by the depth of attachment of the cap to the vibrating cylinder. For example, if it is a screw type, you can adjust the screwing depth.

With this configuration, even if there are two types of files with handle thicknesses that the doctor is accustomed to, it is possible to easily handle this by making it possible to replace the file with the cap. If files with different thicknesses of handles become standard in the future, several types of caps corresponding to the two types of files may be provided. It is also possible to have two or three sizes of concentric holes.

According to this invention, in order to attach the file to the attachment part, it is only necessary to change the direction of the needle of the file, and as a result, even with a commercially available file, the length of the needle can be changed to two types with just one file, and the length of the needle can be changed to two different lengths. This has the effect of making it possible to use them separately as two.

Further, according to the present invention, when exchanging files with handles of two different thicknesses, the cap can accommodate the difference in thickness.

FIG. 2 is an explanatory diagram schematically showing a part of Example 1 with a cutout. FIG. 2 is an explanatory diagram schematically showing this circuit portion. FIG. 2 is an explanatory diagram schematically showing a vibrating cylinder 13 with a part thereof cut away. It is an explanatory diagram of a usage state. FIG. 7 is an explanatory diagram schematically showing a part of Example 2 with a cutaway. It is an explanatory diagram of a usage state. FIG. 7 is an explanatory diagram of Example 3. It is an explanatory diagram of a usage state. FIG. 4 is an explanatory diagram of Example 4. FIG. 7 is an explanatory diagram showing the cap 7 of Example 4 from the bottom direction. It is an explanatory diagram of a usage state. It is an explanatory diagram of a usage state.

Examples of the present invention will be described below based on the drawings, but the present invention is not limited thereto.

This embodiment will be explained using FIGS. 1 to 4. The reciprocating motion generating tool 1 consists of a handle-side housing 10 and a vibration-side housing 11, and the vibration-side housing 11 is configured to form a T-shape with the handle-side housing 10 at the tip of the handle-side housing 10. is attached to. A removable part 13 for a hand file 4 for treating the inside of a root canal is built into the vibration-side housing 11 so as to be reciprocally movable, with the distal end part coming out from the opening 12. A reciprocating motion generating section, which will be described later, is for reciprocating the attachment/detachment section 13.

An electric geared motor 20 is housed in the chair unit 2, and power is supplied to an input terminal 22 of the geared motor 20 from a chair unit power supply 24 via a foot switch 23. A rotating shaft 21 of the geared motor 20 is connected to a rotating shaft 25 inside the handle-side housing 10.

A pin 26 is provided eccentrically at the tip of the rotating shaft 25, and this pin 26 engages with a pin hole 14 provided in a side surface of the detachable portion 13. The reciprocating motion generating section is configured in this way. The hand file 4 used in this embodiment consists of a knob 40, which is an insertion part, and a needle part 41, and a fine protrusion 42 is formed around the needle part 41.

The attachment/detachment part 13 is located inside the vibration-side housing 11 and is provided so as to be able to vibrate in the front-rear direction (vertical direction in FIG. 1). Further, a guide pin 17 protruding from the side surface of the detachable portion 13 is inserted into a guide groove 18 provided inside the vibration-side housing 11 in the front-rear direction, that is, in the direction in which the hand file 4 reciprocates.

In addition, a mounting port 16 is opened at the rear end of the detachable part 13, and when the hand file 4 is mounted from here, the needle part 31 is opened in the detachable part 13 (as a needle hole on one side). ) is configured so that it can be pushed in until it comes out of the needle passage hole 15 and the tip of the knob 40 comes into contact with the inside of the needle passage hole 15.

Furthermore, by screwing the cap 3 as a fixing means into the mounting opening 16, the hand file 4 can be fixed. Therefore, the hand file 4 can be replaced by attaching and detaching the cap 3. In particular, this cap 3 is provided with a needle hole 30 (as the needle hole on the other side). The depth of the needle through hole 30 is designed to be longer than the depth of the needle through hole 15 of the attachment/detachment section 13 . Note that the fixing means does not have to be a screw type.

Since the pin 26 of the rotating shaft 25 is laterally fitted into the pin hole 14 in the side wall of the detachable part 13, as is clear from FIG. Another feature is that the hand file 4 does not substantially rotate around the needle portion 41 of the hand file 4. However, in consideration of the case where relatively large rotational vibrations are not acceptable, the configuration of the guide pin 17 and the guide groove 18 as described above is provided. Note that the arrow S indicates the direction of the stroke.

The method of using this embodiment is to insert the hand file 4 into the attachment port 16 from the needle part 41 side as shown in FIG. The hand file 4 is fixed by screwing the cap 3 into the mounting opening 16. In this way, the reciprocating motion generator 1 is ready for use in root canal treatment.

If there is no problem with the reciprocating motion generator 1 in this state, it is sufficient to continue using it in this state. On the other hand, if a situation arises where it would be better if the length of the needle portion 41 were shorter, the following measures can be taken, which are unique to the reciprocating motion generator 1 of this embodiment. be. That is, the cap 3 is removed from the mounting opening 16, and the hand file 4 is temporarily taken out. Subsequently, the posture of the hand file 4 is reversed by 180 degrees, and the hand file 4 is inserted into the mounting opening 16 from the side of the knob 40. This causes the needle portion 41 to move rearward from the mounting port 16. Therefore, when the needle part 41 is passed through the needle passage hole 30 provided in the cap 3 and the cap 3 is screwed into the mounting opening 16, the hand file 4 is fixed and the needle part 41 is inserted into the needle passage hole 30. The cap 3 protrudes from the cap 3 (FIG. 4).

Although FIGS. 1 and 4 are both schematic diagrams, it is clear from these figures that the length of the needle of the cap 3 is smaller than the length of the needle of the cap 3 that protrudes from the needle passage hole 15 of the detachable part 13 of the needle part 41. It can be clearly seen that the length protruding from the through hole 30 is shorter.

Next, the reciprocating motion generator 5 of this embodiment, which will be explained using FIGS. 5 and 6, is characterized in that the hand file 4 is configured to be attachable and detachable from the side wall side of the vibration-side housing 51. That is, an opening 52 is opened at the tip of the vibration-side housing 51, and a detachable part 53 as a vibration cylinder is attached to the opening 52. This attachment/detachment part 53 is located inside the vibration-side housing 51 and is provided so as to be able to vibrate in the front-rear direction (vertical direction in FIG. 5). Further, the pin 26 described in the first embodiment is fitted into a pin hole 54 provided at the rear end of the vibrating cylinder 53. Further, a guide pin 58 protruding from the rear end of the vibration tube 53 is inserted into a guide groove 59 provided inside the vibration side housing 51 in the front-rear direction (vertical direction in FIG. 5). Note that a needle passage hole 55 for passing the needle portion 41 of the hand file 4 is formed at the front end of the vibrating cylinder 53.

Further, a mounting port 56 for the hand file 4 is opened in the side wall of the vibration cylinder 53, and a mounting port (not shown) is also opened in the side wall of the vibration side housing 51 in accordance with the position of the mounting port 56. has been done. A receiving rubber 57 for the knob 40 of the hand file 4 is attached to the inner wall of the vibrating cylinder 53. Note that a needle passage hole 500 for passing the needle portion 41 of the hand file 4 is formed at the rear end of the vibrating cylinder 53.

The needle passing hole 55 and the needle passing hole 500 have different depths, and the depth of the needle passing hole 55 on the front end side of the vibrating barrel 53 is different from that of the needle passing hole 55 on the rear end side of the same vibrating barrel 53. It is designed to be shorter than the depth of the needle hole 500.

The method of using this embodiment is to push the handle 40 into the mounting opening 56 while passing the needle 41 of the hand file 4 through the needle hole 55 as shown in FIG. Then, the knob 40 is firmly fixed by the receiving rubber 57. Next, the hand file 4 is temporarily removed from the mounting port 56 by pinching the knob 40 in the mounting port 56 with the fingertips. Next, the posture of the hand file 4 is reversed by 180 degrees, and this time, while passing the needle part 41 toward the needle hole 500, the knob part 40 is pushed into the mounting opening 56. As a result, the knob 40 is firmly fixed by the receiving rubber 57. This hour hand portion 41 projects outward from a needle through hole 500 on the rear end side of the vibrating barrel 53, as shown in FIG.

Although FIGS. 5 and 6 are both schematic diagrams, it can be seen from these diagrams that the length of the needle portion 41 protruding from the needle through hole 55 at the tip end of the vibrating cylinder 53 is It can be seen at a glance that the length of the needle portion 41 protruding from the needle passage hole 500 on the rear end side is shorter.

Next, a reciprocating motion generating tool 6, which will be explained using FIGS. 7 and 8, has a configuration similar to the reciprocating motion generating tool 1 in the first embodiment described above, but has a guide groove 18 and a guide pin 17. It does not have a configuration. Instead, this reciprocating motion generating tool 6 is characterized in that a pin hole 64 for inserting the pin 26 is formed in the outer circumference of the vibrating cylinder 63 over 360 degrees. However, although the angle is 360 degrees, a stopper 67 is provided in a part of the pin hole 64. A rotating shaft of a motor (not shown) is connected to the rotating shaft via a geared box, and a pin 26 is provided on this rotating shaft. It is possible to move freely within 64. In other words, until the pin 26 comes into contact with the stopper 67, the vibrating cylinder 63 is rotatable inside the vibration-side housing 61.

Further, an opening 62 is opened at the tip of the vibration-side housing 61 of the reciprocating motion generating tool 6, and the above-mentioned vibration cylinder 63 is attached to the opening 62. The vibrating cylinder 63 is located inside the vibration-side housing 61 and is provided so as to be able to vibrate in the front-rear direction (vertical direction in FIG. 7). A file attachment port 66 is opened at the rear end of the vibrating tube 63, and when the file 4 is attached from here, the needle portion 41 passes through the needle on one side (tip side) of the vibrating tube 63. It is configured such that it can be pushed in until it comes out of the hole 65 and the tip of the knob 40 comes into contact with the inside of the needle hole 65. Note that the file 4 can be fixed by screwing the cap 3 into the mounting opening 66. Therefore, the file 4 can be replaced by attaching and detaching the cap 3. In particular, this cap 3 is provided with a needle hole 30 (as the needle hole on the other side). The depth of this needle through hole 30 is longer than the depth of the needle through hole 65 of the vibrating barrel 63. Note that the fixing means does not have to be a screw type.

The reciprocating motion generator 6 of this embodiment was developed with the purpose of reciprocating the flexibly bending needle 41 of the hand file 4. This is because the shape of the curve in the root canal differs from patient to patient and from tooth to tooth even in the same patient, and the needle 41 was forced to enter the curved part of the root canal first. In such cases, it may be difficult to pull out the needle 41, and the needle 41 may be bent or damaged, or worse, the needle 41 may break and remain at the apex of the root canal. be.

As a result of intensive research and development, we were able to obtain the knowledge that it would be even better if the vibrating tube 63 was allowed to rotate freely. This free rotation does not mean forcibly rotating or rotating using a driving force, but simply means that it is not fixed and can move freely to the left or right without resisting external force. . With this configuration, even if there is resistance to the reciprocating movement of the hand file 4, or if it is likely to bite into the root canal, this can be avoided and the needle 41 can be prevented from twisting and This made it possible to continue smooth reciprocating motion without bending. FIG. 8 is a schematic diagram showing the operating state. Since pins 26 of approximately the same diameter are inserted into the pin holes 64, when the pins 26 eccentrically connected to the rotation axis of the motor rotate ( In FIG. 8, the moment when the pin 26 moves from the position shown by the chain line to the position shown by the solid line is shown), and this rotational movement is converted into a reciprocating movement of the vibrating cylinder 63 in the back and forth direction as shown in FIG. . On the other hand, since the pin hole 64 is formed on the outer circumference of the vibrating tube 63 over 360 degrees, the vibrating tube 63 can freely rotate in the direction of the arrow. This is exactly what makes the reamer's needle-like part difficult to twist. The function of the stopper 67 will be described later.

The pin hole 64 and pin 26 in this embodiment have important effects as described above. Furthermore, due to the synergistic effect of the smoothly repeated reciprocating motion and the flexible bending nature of the needle 41 of the hand file 4, it is possible to enter the root canal conveniently over and over again even in curved areas. I visited him often, and as a result, I was able to complete the treatment for cavities within a short period of time. Furthermore, once free rotation became possible, a phenomenon was observed in which the insect avoided the filling and entered, and conversely, wrapped around the filling while retreating and taking out the old filling.

By the way, the pin 26 on the rotating shaft side of the motor is engaged with a pin hole 64, and this pin hole 64 is carved in the outer circumference of the vibrating cylinder 63 over 360 degrees. The reason for this configuration will be described later, but when the hand file 4 is inserted into the vibrating cylinder 63 from the rear side and the cap 3 is screwed into the mounting opening 66, the vibrating cylinder 63 will not move against the vibration side housing 61. It is difficult to tighten the cap 3 because it rotates freely over 360 degrees. However, since the stopper 67 is provided in the pin hole 64, it is possible to prevent the vibrating cylinder 63 from rotating more than 360 degrees, and the cap 3 can be reliably tightened.

After all, the length of the detachable part 63 of the needle part 41 that protrudes from the needle hole 65 is longer than the length that protrudes from the needle hole 30 of the cap 3. It becomes shorter.

Next, the cap 7 of this embodiment, which will be explained using FIGS. 9 to 12, has an insertion hole 72 opened in the center of the abutting part 70, which is the bottom of the screw-in part in which a thread 71 is carved. It is screwed onto the mounting opening 66 of the vibrating cylinder 63 of the reciprocating motion generator 6 described above.

With the cap 7, the reciprocating motion generator 6 can selectively use two types of hand files 4 and 8. FIG. 11 is an explanatory diagram when the hand file 4 is used, and FIG. 12 is an explanatory diagram when the hand file 8 is used. First, when using the hand file 4, manually pick the handle 40, insert the needle 41 through the mounting port 66 of the vibrating cylinder 63, and insert it into the needle hole 65. Screw the cap 7 into the hole 66. At this time, since the width of the grip part 40 of the thick-handled hand file 4 and the width of the contact part 70 of the cap 7 are almost equal, the hand file 4 has an insertion hole 72 opened in the center of the contact part 70. It is fixed in the vibrating cylinder 63 while being pressed by the contact part 70.

When using the hand file 8 next time, first twist the cap 7 in the loosening direction and remove the hand file 4. Next, the knob 80 of the hand file 8 is picked by hand, and the needle part 41 is passed through the needle passage hole 65 from the attachment port 66 of the vibrating cylinder 63 to be attached. The cap 7 is screwed deeply into the mounting opening 66 so that it can be inserted into the insertion hole 72 of the abutting part 70 and the cap 7 is fixed inside the vibrating cylinder 63. The hand file 8 is composed of an elongated knob 80 which is an insertion part, a needle part 81, and a fine protrusion 82 around the needle part 81.

According to this invention, the electric reciprocating motion generator can further shorten the length of the needle portion of the file depending on the treatment situation. Alternatively, the electric reciprocating motion generator can be used with two types of files (two types of files with different handle thicknesses) that have different usability depending on the treatment situation. This invention has extremely high industrial utility value, such as making dentists' work easier and reducing fatigue.

Note that this invention may be used in the field of veterinary medicine. It should be noted that it is important for the cap with a needle hole of this invention, whether it is a screw-in type or not, to have a needle hole for a file, and it is different from the conventional electric type. Since it can be applied to a reciprocating motion generator, it can be said that this cap alone has extremely great industrial utility value. Alternatively, since the cap having the insertion hole of the present invention can be applied to a conventional electric reciprocating motion generator, it can be said that this cap alone has extremely great industrial utility value.

1: Reciprocating motion generator 10: Handle side housing 11: Vibration side housing 12: Opening portion 13: Detachable portion 14: Pin hole 15: Needle hole 16: Mounting port 17: Guide pin 18: Guide groove 2: Chair Unit 20: Geared motor 21: Rotating shaft 22: Input terminal 23: Foot switch 24: Chair unit power supply 25: Rotating shaft 26: Pin 3: Cap 30: Needle hole 4: Hand file 40: Knob section 41: Needle section 42 : Protrusion 5 : Reciprocating motion generator 51 : Vibration side housing 52 : Opening part 53 : Detachable part 54 : Pin hole 55 : Needle through hole 56 : Mounting port 57 : Receiver rubber 58 : Guide pin 59 : Guide groove 500 : Needle Through hole 6: Reciprocating motion generator 61: Vibration side housing 62: Opening 63: Vibration cylinder 64: Pin hole 65: Needle through hole 66: Mounting port 67: Stopper 7: Cap 70: Contact part 71: Screw thread 72: Insertion hole 8: Hand file 80: Knob part 81: Needle part 82: Protrusion

Claims (2)

A vibration tube for fixing a file, which is detachably attached to the attachment opening of a vibrating cylinder which is provided with a file attachment part and has a file needle passage hole on one side and an attachment opening for a file knob on the other side. The cap has an abutting part that presses the knob at the tip of the threaded part that is screwed into the mounting opening of the cap, and a part other than the file in the center of the abutting part. A cap of a reciprocating motion generator for root canal treatment, which has an insertion hole into which a thin knob of a file is inserted, the file having a knob thinner than the knob of the file. A reciprocating motion generator for root canal treatment, comprising the cap according to claim 1.

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