JP3235293U - File for root canal treatment and dental handpiece with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress excessive bending of a tip portion of a needle portion, to easily apply lateral pressure to a root canal wall, to improve efficiency of root canal enlargement, etc., and to reduce the amount of leftover infected dentin or the like. Provides a file for root canal treatment to be attached to a dental handpiece. A file 100 for root canal treatment, which is formed by twisting an elongated metal plate of a nickel-titanium alloy having a required shape, initially has a twisted portion 103 having a length of 16 mm and a tip diameter of 1.25 mm. , Twisting is performed so that the taper angle is 2/100, and then the cut portion 104 for 3 mm is cut from the tip portion, and finally the length of the twisted portion 103 of the needle portion 102 is 13 mm. It is also a file 100 for root canal treatment. [Selection diagram] Fig. 1

Description

The present invention relates to a root canal treatment file attached to the tip of a dental handpiece for the treatment of root canal enlargement in dentistry. The file referred to in this device is a file for filing against a reamer for reaming (spreading), but this device does not strictly define this difference, and is similar to these. It shall include the therapeutic equipment to be used.

A root canal where a dentist scrapes the wall of the root of a patient's caries, removes a lump of pus stuck at the tip of the root, a filler that is a trace of previous treatment, and pulls out nerves. It is common to use a file or a reamer when performing treatment such as. These consist of a needle part inserted into the root canal and a grip part provided at the rear part, and the needle part is made by twisting an elongated metal plate made of a metal material such as stainless steel or nickel titanium. ..

Regarding the removal of the gutter percha, the removal with a lysing agent may leave the gutter percha in the root canal and interfere with the subsequent treatment. For this reason, the files are generally carefully removed.

The file is also manipulated by the dentist with his or her fingertips, but here we will explain the case where it is attached to a dental handpiece and used. The dental handpiece reciprocates between the housing, the tooth cutting file and reamer attachment / detachment portion provided in the housing and the attachment / detachment portion, and the attachment / detachment portion of the micromotor. Generally, it consists of a reciprocating motion generator that reciprocates a file or reamer by giving it in place of motion. As a standard for files attached to such dental handpieces, the diameter of the tip of the needle is, for example, 0.25 mm, which is 1/100 of the standard # 25, and the diameter 16 mm behind it. Since the taper is 2/100, it is 0.57 mm.

The inventor of the present invention attaches a file having such a shape to a dental handpiece and uses it, and when the file reciprocates at high speed, the tip of the needle of the file is excessively bent and the root canal is used. I found that the power to break the wall weakened. If the tip is bent too much, the efficiency of root canal enlargement will decrease, and inconveniences such as leftover of infected dentin and gutter percha will occur.

The problem of this idea is that the file attached to the dental handpiece suppresses excessive bending of the tip of the needle, makes it easier to apply lateral pressure to the root canal wall, and improves efficiency such as root canal enlargement. The purpose is to provide a file for root canal treatment that will reduce the amount of leftovers such as infected dentin. Being able to perform root canal treatment more reliably and quickly will be less tiring and comfortable for both patients and dentists, and long-term stable treatment should also contribute to curbing treatment costs. be.

Prior to solving the above problem, the present inventor provided a short-sized needle portion excluding the portion that is excessively bent from the beginning while keeping the specified angle of 2/100 in order to suppress the excessive bending of the file tip portion. I thought I should do it. Careful observation of the excessively bent part in # 25 in the above example shows that it was about 3 mm from the tip part, so if we provide a tip part with a diameter of 0.31 mm without this part from the beginning. It is good. That is, an elongated metal plate having a tip diameter of 0.31 mm when twisted may be used. However, even if it is calculated, the mystery that the entire needle part is actually hard to bend, and the unwilling situation that the bending necessary for advancing the root canal cannot be obtained, so the inventor further Was forced to solve this problem.

The above-mentioned problem is characterized in that a needle portion formed by twisting so that the taper angle is 2 degrees is attached and a new tip portion is formed by cutting 3 mm from the tip portion thereof, for root canal treatment. Achieved by providing the file. For example, the total length of the needle part of # 25 is 25 mm, the length of the twisted part is 16 mm, the diameter of the tip part is 0.25 mm (model number # 25), and the taper angle is 2/100. It takes over the product manufactured in 1 and cuts 3 mm from the tip. The diameter of this new tip is approximately 0.31 mm. According to this file, strangely enough, the entire needle has the bending required to travel through the root canal, but there is no over-bending. It is a perfect file to attach to a dental handpiece.

In this way, excessive bending is eliminated, the root canal wall can be evenly thinned, and the efficiency of root canal enlargement and the like is improved.

It should be noted that the cut portion can be filed to be rounded, or plating such as nickel plating can be applied to make the cut portion and its peripheral portion smoother. If the needle portion before cutting is plated, the same type of plating may be applied to the cut portion. In addition to this, although the cost is somewhat higher, a carbon coating or a DLC (Diamond-Like Carbon) coating may be applied to the needle portion. Diamond-like carbon is an amorphous hard carbon having an intermediate physical characteristic between diamond and graphite, and a nano-level thin film can be formed on the metal surface by coating. According to this, it is possible to obtain a surface having a low wear coefficient, that is, a metal surface having high lubricity, which is convenient for reciprocating the root canal.

Further, although the file for root canal treatment of the present invention is driven by the dental handpiece, it is preferable to configure the dental handpiece so that the file of the present invention can be attached and detached. The file may be attached to the dental handpiece, but cleaning the entire head of the dental handpiece can be a daunting task in a sense. If it is possible to replace and use the file for this, it will be very preferable in terms of hygiene. The dental handpiece with the file of this device attached is also within the scope of the rights of this device.

This device is a file that is attached to a needle-shaped part that has been twisted so that the taper angle is 2 degrees in advance, and 3 mm is cut from the tip part to make a new tip part, so this is for dentistry. When the root canal is treated by attaching it to the handpiece, the tip of the file does not bend too much, the root canal wall is evenly softened, and the efficiency of root canal enlargement is improved.

It is explanatory drawing of Example 1. FIG. It is explanatory drawing of Example 2. FIG. It is explanatory drawing of Example 3. FIG. It is explanatory drawing of Example 4. FIG. It is explanatory drawing of Example 5. FIG.

Hereinafter, examples of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

The file 100 includes an insertion portion 101 for picking and operating with a fingertip and inserting into a dental handpiece, and an insert-molded needle portion 102 thereof. The needle part is twisted on an elongated metal plate made of nickel-titanium alloy with the required shape. Initially, the twisted part 103 has a length of 16 mm, a tip diameter of 1.25 mm, and a taper angle of 2/100. The metal plate is set so that the total length of the needle portion 102 is 25 mm by twisting. After obtaining such an initial needle portion 102, when the portion 3 mm from the tip portion is excised as the excision portion 104, the total length of the needle portion 102 is finally 22 mm and the length of the twisted portion 103 is 13 mm. The tip portion 105 is formed on the twisted portion 103. The diameter of the tip 105 is 0.31 mm.

According to this embodiment, it was possible to obtain a file 100 in which the needle portion 102 as a whole has the bending necessary for advancing the root canal, but there is no excessive bending portion. The file 100 is perfect for attaching to the handpiece 200 described in the second embodiment.

The handpiece 200 of this embodiment is configured to be connected to a rotating shaft of an electric motor of a chair unit (not shown) and driven to rotate. The switch of this electric motor is a foot switch (not shown). In this handpiece 200, the vibration side housing 202 is attached to the support portion 201, and the vibration cylinder 204 is attached to the vibration side housing 202. A pin 301 is provided at the tip of the support 201 so that the extension portion of the rotation shaft 300 of the electric motor of the chair unit is eccentric to the tip of the rotation shaft 300 through the support 201.

Next, a vibrating cylinder mounting port 203 is opened at the tip of the vibrating side housing 202, and the vibrating cylinder 204 is mounted here. The vibrating cylinder 204 is inside the vibrating side housing 202 and is provided so as to be vibrable in the front-rear direction (vertical direction in FIG. 2). Further, in the vibrating cylinder 204, the pin 301 is inserted into a pin hole 205 provided at the rear end portion. Further, a guide pin 208 projecting from the rear end portion of the vibrating cylinder 204 is fitted into a guide groove 209 provided in the front-rear direction inside the vibrating side housing 202.

An insertion port 207 for inserting the file 100 according to the manufacturing method of the first embodiment is opened at the rear end portion of the vibrating cylinder 204, and when the file 100 is inserted from here, the needle portion 103 thereof is opened. It is configured so that it can be pushed out of the needle through hole 206 of the vibrating cylinder 204 until the tip of the insertion portion 101 of the file 100 comes into contact with the inside of the needle through hole 206. The file 100 can be fixed by screwing the screw lid 210 into the insertion port 207. Therefore, the file 100 can be replaced by attaching and detaching the screw lid 210.

The feature of this embodiment is that the file 100 can be attached and detached from the rear end side of the vibrating cylinder 204 instead of the front end side, so that the file 100 can be easily attached. It is in. Since the pin 301 of the rotating shaft 300 is fitted into the pin hole 205 of the side wall portion of the vibrating cylinder 204 from the lateral direction, the rotation of the rotating shaft 300 only vibrates the vibrating cylinder 204 in the front-rear direction, and the vibrating cylinder 204 It is also characterized in that it does not act to rotate around the needle portion 103 of the file 100. However, in consideration of the case where it is not good that a slight rotational vibration occurs, the configuration of the guide pin 208 and the guide groove 209 as described above is provided.

In this way, the needle portion 102 of the file 100 inserted into the handpiece 200 is not excessively bent, the root canal wall can be evenly thinned, and the efficiency of root canal enlargement and the like is sufficiently improved.

The handpiece 400 of this embodiment is configured to be connected to a rotating shaft of an electric motor of a chair unit (not shown) and driven to rotate. The switch of this electric motor is a foot switch (not shown). This handpiece 400 follows most of the configurations of the second embodiment, but differs greatly in that the pin groove 405 is also kicked on the side wall of the vibrating cylinder 404 into which the pin 501 of the rotating shaft 500 is fitted. It has become a thing.

In this handpiece 400, the vibration side housing 402 is attached to the support portion 401, and the vibration cylinder 404 is attached to the vibration side housing 402. A pin 501 provided with an extension portion of the rotary shaft 500 of the electric motor of the chair unit eccentric to the tip portion of the rotary shaft 500 through the support portion 401 is located at the tip portion of the support portion 401. A vibrating cylinder mounting port 403 is opened at the tip of the vibrating side housing 402, and the vibrating cylinder 404 is mounted here. The vibrating cylinder 404 is located inside the vibrating side housing 402 and is provided so as to be vibrable in the front-rear direction (vertical direction in FIG. 3).

An insertion port 407 for inserting the file 100 according to the manufacturing method of the first embodiment is opened at the rear end portion of the vibrating cylinder 204, and when the file 100 is inserted from here, the needle portion 103 thereof is opened. It is configured so that it can be pushed out of the needle through hole 406 of the vibrating cylinder 404 until the tip of the insertion portion 101 of the file 100 comes into contact with the inside of the needle through hole 406. The file 100 can be fixed by pushing the push-in lid 408 into the insertion port 407. Therefore, the exchange of the file 100 is performed by pulling out or pushing in the push-in lid 408.

Further, in this embodiment, a pin hole 405 for inserting the pin 501 is engraved on the outer peripheral portion of the rear portion of the vibrating cylinder 404 over 360 degrees. The reason for this configuration will be described later, but when the file 100 is inserted into the vibrating cylinder 404 from the rear side and the screw lid 408 is screwed into the insertion port 407, the vibrating cylinder 404 becomes the vibrating side housing 402. On the other hand, it is difficult to tighten the screw lid 408 because it rotates freely beyond 360 degrees. Two proposals are presented to solve this problem, and one of the proposals is to project the tip of the vibrating cylinder 404 from the vibrating cylinder mounting port 403 of the vibrating side housing 402 as shown in FIG. By pressing the fingertip against the tip of the exposed vibrating cylinder 404, the rotation of the vibrating cylinder 404 can be suppressed and the screw lid 408 can be tightened. Although the two plans are not shown, by providing a protruding portion inside the pin hole 405 carved over 360 degrees, the pin 501 hits the pin hole 405 and the vibrating cylinder 404 cannot rotate any more. The same thing as this is to engrave the pin hole to less than 360 degrees, for example, 350 degrees.

As described above, in this embodiment, the moving cylinder 404 is configured to be able to rotate freely. Free rotation does not mean that it is forcibly rotated and rotated by a driving force, but that it can move freely in either direction without resisting an external force by simply keeping it unfixed. With this configuration, even if there is resistance from the root canal to the reciprocating motion of the file 100, or even if it is likely to bite into the root canal, it is possible to avoid them, so that the needle In particular, the twisted portion 103 is less likely to be twisted, bent or broken, and the reciprocating motion can be smoothly continued.

The file 106 includes an insertion portion 107 for picking and operating with a fingertip and inserting into a dental handpiece, and an insert-molded needle portion 108. For the needle part, a long and narrow metal plate of nickel-titanium alloy with the required shape is twisted. Initially, the twisted part 109 has a length of 16 mm, a tip diameter of 1.25 mm, and a taper angle of 2/100. The metal plate is set so that the total length of the needle portion 108 is 25 mm after being twisted so as to be. After obtaining such an initial needle portion 108 and then cutting 3 mm from the tip portion as the cut portion 110, the total length of the needle portion 108 becomes 22 mm and the length of the twisted portion 109 finally becomes 13 mm, and this new twist The tip portion of the portion 109 was filed to be rounded to form the rounded portion 111. The diameter of this portion is 0.31 mm.

According to this embodiment, it was possible to obtain a file 106 in which the needle portion 108 as a whole has the bending required to advance the root canal, but the portion does not bend too much. The trace of the excision of the excised portion 110 becomes a rounded portion 111 and has a rounded portion.

The file 112 includes an insertion portion 113 for picking and operating with a fingertip and inserting into a dental handpiece, and an insert-molded needle portion 114 thereof. For the needle part, a twisting process is performed on an elongated metal plate made of nickel-titanium alloy having the required shape. Initially, the twisted portion 115 is twisted so that the length is 16 mm, the tip diameter is 1.25 mm, and the taper angle is 2/100, and the metal plate is made so that the total length of the needle portion 114 is 25 mm. It is set. After obtaining such an initial needle portion 114 and then cutting 3 mm from the tip portion as the cut portion 116, the total length of the needle portion 114 is 22 mm and the length of the twisted portion 115 is 13 mm. A plated portion 117 formed by applying a DLC (Diamond-Like Carbon) coating to the tip portion of the twisted portion 115 was formed.

According to this embodiment, it was possible to obtain a file 112 in which the needle portion 114 as a whole has the bending required to advance the root canal, but does not have an excessive bending portion. The trace of the excision of the excised portion 116 is the plated portion 117, which is a surface having a low wear coefficient, that is, a metal surface having high lubricity.

When the file of this device is attached to a dental handpiece and root canal treatment is performed, excessive bending of the tip of the needle is suppressed, lateral pressure is easily applied to the root canal wall, root canal enlargement, etc. It has the effect of increasing efficiency and reducing the amount of leftovers such as infected dentin. This has made it possible to reduce the burden on dentists, improve treatment techniques, and contribute to the development of industry. It should be noted that this invention is not limited to the dimensions of each part of the above-described embodiment.

100: File 101: Insertion part 102: Needle part 103: Twist part 104: Cut part 105: Tip part 106: File 107: Insertion part 108: Needle part 109: Twist part 110: Cut part 111: Rounding part 112: File 113: Insertion part 114: Needle part 115: Twist part 116: Cut part 117: Plating part 200: Handpiece 201: Support part 202: Vibration side housing 203: Vibration cylinder mounting port 204: Vibration cylinder 205: Pin hole 206: Needle through hole 207: Insertion port 208: Guide pin 209: Guide groove 210: Screw lid 300: Rotating shaft 301: Pin 400: Handpiece 401: Support part 402: Vibration side housing 403: Vibration cylinder mounting port 404 : Vibrating cylinder 405: Pin groove 406: Needle through hole 407: Insertion port 408: Push-in lid 500: Rotating shaft 501: Pin

Claims (4)

A file for root canal treatment, which is characterized by having a needle part twisted so that the taper angle is 2 degrees, and cutting 3 mm from the tip part to form a new tip part. The file for root canal treatment according to claim 1, wherein the new tip is filed. The file for root canal treatment according to claim 1, wherein at least the new tip is plated. A dental handpiece comprising the file for root canal treatment according to any one of claims 1 to 3.

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