JP4481146B2 - Dental cutting instrument - Google Patents

Description

  The present invention relates to a dental cutting instrument, and more particularly to a file and a reamer used for measuring a tooth root canal length.

  In endodontic treatment, the difficult point of tooth root canal treatment is to expand and clean the root canal to the position of the apical hole without damaging the tissue around the apex, and to fill the root canal with a filler (gutter percher) Is to fill. It is not preferable to injure and stimulate the tissue surrounding the apex with a file, reamer, broach or the like that is a dental cutting tool beyond the apical position during dental treatment.

  For this reason, there is fear of infection due to irritation to tissues around the apical teeth, etc., and the dental cutting tool is not inserted into the root canal, and the apical root canal is not cleaned or disinfected. A gap will be left. Therefore, in order to perform root canal treatment correctly, the exact length of the root canal in advance ("root canal length": the length between the dentin / cementum boundary and the reference point on the crown side, It is necessary to know (also called “working chief”).

  Therefore, conventionally, a method of electrically measuring the root canal length using a hand cutting tool (file or the like) has been adopted.

  That is, in the conventional root canal length measuring method, first, as shown in FIG. 4, for example, a dental root canal H file 1a is used as a hand cutting instrument. As shown in FIG. 4, the file 1a includes a needle portion 2a, a blade portion 3a formed at one end of the needle portion 2a, a handle portion 4a formed at the other end of the needle portion 2a, and a needle portion 2a. And an annular rubber topper 9a fitted in the vicinity of the handle portion 4a. For example, according to JIS (T5212), the total length of the needle portion 2a is 21 mm to 31 mm, the length of the blade portion 3a is a minimum of 16 mm, the diameter of the tip of the blade portion 3a is 0.10 to 1.40 mm, and the blade portion 3a is vertical. The cross-sectional shape is a toroidal shape, and a hard steel wire, piano wire, stainless steel wire, or spring stainless steel wire is used as the material.

  Then, as shown in FIG. 5, when the file 1a is inserted into the root R of the tooth T and the file 1a reaches the apex r, the length to the rubber topper 9a is measured, The root canal length L is measured using a commercially available apical position detection device in real time.

  Here, manual cutting is performed by the grasping portion 10a (see FIG. 6) of the file holder 10 of the apical position detecting device M (for example, “Root Canal Length Measurement Module (DENTA PORT) of Morita Manufacturing Co., Ltd.)” shown in FIG. The root canal length L is measured by grasping the needle 2a of the instrument (file, reamer, etc.) 1a.

  As shown in FIG. 7, the detection device M includes a root ZX module 12, which includes a liquid crystal display 13, a POWER switch 14, a MODE switch 15, a SELECT switch 16, and a SET switch 17, and includes a file holder. 10 is connected to the root ZX module 12 via a probe cord 11, and the probe cord 11 is connected to a cord 18 for connecting a counter electrode and a clip for salivary duct (not shown) in a bifurcated manner. It is electrically connected to the detection device M through the holder terminal and the cord.

  Then, as shown in FIG. 6, after the file 1a is gripped by the file holder 10 of the apical position detecting device M configured as described above, the file 2a is inserted into the root R. Then, by measuring the length to the rubber topper 9a that the tip of the file 2a has reached the apex position r, it is electrically detected by the detection device M, and the root of the file 2a is displayed on the liquid crystal display 13 of the module 12. The tube length L is detected (measured).

  However, in the conventional root canal length position detecting device M, as shown in FIG. 6, the handle 2a of the file 8a is held by the holding portion 10a of the file holder 10, so that the handle 4a of the file 1a is held on the fingertip. It is extremely difficult to adjust the position of the file 1a by giving the file 1a a slight rotation and vertical movement by holding the handle 1b.

In addition, since the holder terminal and the cord are held on the needle portion 2a of the file 1a via the file holder 10, the holder terminal is entangled with the file 1a, and the gap between the teeth is narrowed so that the holder terminal and the cord are operated It was in the way.
Japanese Patent Laid-Open No. 10-155818

  The problem to be solved by the present invention is that, in a dental cutting instrument such as a file or a reamer, the dental cutting instrument can be freely operated (rotated / moved up and down) at the fingertip to make a fine position adjustment, etc. It is in.

  The present invention relates to a dental cutting instrument comprising a needle part, a blade part formed at one end of the needle part, and a handle part formed at the other end of the needle part, and the needle near the handle part. The present invention relates to a dental cutting instrument characterized in that the other annular portion is extended and bent to form a first annular body, and a second annular body is rotatably connected to the first annular body.

  Since the holder terminal and the cord are connected to the dental cutting instrument (file or reamer) via a rotatable annular body (Salkan), the file operation becomes extremely easy without the holder terminal and the cord being entangled. Also, no file holder is required.

〔Example〕
FIG. 1 is a front view of a dental cutting instrument 1 of the present invention, for example, a root canal file. This root canal file is a tooth root canal length (see FIG. 6) obtained by an apical position detecting device (see FIG. 6). It is used for the measurement of L) shown in FIG.

  As shown in FIG. 1, the root canal file 1 is a needle having a diameter of 0.42 mm to 1.72 mm and a length of 21 mm to 31 mm made of hard steel wire, piano wire, stainless steel wire, stainless steel wire for springs, or the like. A portion 2 and a blade portion 3 formed at one end of the needle portion 2 and having a vertical cross-sectional cross section, and a diameter of about 3 mm and a length of about 10 mm attached to the other end of the needle portion 2 are made of plastic. A handle part 4 (the diameter of the handle part 4 may be a large diameter of about 10 mm, for example), and a sarkan integrated with a bent metal needle part 2 extending from the tip of the handle part 4 The mounting ring 5 (first annular body) and an annular rubber topper 9 fitted in the vicinity of the handle portion 4 of the needle portion 2 are configured. Since the part excluding the Sarkan wearing ring 5 is commercially available as a standard product as, for example, JIS (T5212), it can be easily obtained at a low cost. Therefore, a commercially available root canal file or reamer is obtained, and the other end of the needle part 2 is bent to form the sarcan attachment ring 5, and the handle part 4 is formed in the vicinity of the sarcan attachment ring 5, for example, injection molding or the like. To form a dental cutting instrument of the present invention (for example, a root canal file or a reamer).

  When the dental cutting instrument 1 according to the present invention is used for measuring the root canal length, a commercially available second annular body [commonly known as a sarkan] is attached to a ring 5 for attaching a sarcane formed in the vicinity of the handle 4 thereof. (Monkey ring: freely rotating metal ring: commercially available under the trade name of power swivel)] One ring 6a of 6 is freely hooked, and the holder terminal 7 and cord 8 are attached to the other ring 6b. They are connected and electrically connected to the apex position detecting device M as shown in FIG. Here, the sarkan 6 is electrically connected via a sarkan mounting ring 5 integral with the blade 3 of the file.

  When the root canal length L is measured using the dental cutting instrument 1 of the present invention, for example, the root canal file 1 is inserted into the root canal R of the tooth T as shown in FIG. While the cutting is performed, the handle 4 is directly gripped by the fingertip and rotated 1/3 to 1/4 and finely moved in the vertical direction.

  When the tip of the file 1 reaches the apical hole r shown in FIG. 4, a current is conducted through the living body via a counter electrode (not shown) applied to the corner of the mouth of the patient, and this position is electrically detected, This is displayed on the liquid crystal display 13 of the apex position detection device M, which indicates that the file has reached the boundary between the dentine and cementum, and the length of the rubber burst top 9 marked on the crown side. The working length is determined by measuring the length. In particular, this root canal length L indicates that when the tip of the file inserted into the root canal reaches the periodontal ligament cavity (apical foramen), the “electricity between the file and the oral mucosa is independent of the type of tooth. The resistance value is measured by applying the principle that it shows a substantially constant value.

  Then, based on the root canal length L accurately measured in this manner, the root canal is enlarged and the root canal is cleaned, and then the root canal is filled with the root canal filling material (agent).

  A first annular body is formed at the tip of a dental hand cutting instrument (file, reamer, etc.), and a second annular body is connected to the first annular body. Applicable.

It is a front view of the dental root canal H file which is one example of the dental cutting instrument of the present invention. It is the front view which attached the sarkan (2nd annular body) to the sarkan mounting ring (1st annular body) of the dental root canal H file shown in FIG. 1, and also connected the holder end and the cord. It is a front view of the sarkan to be mounted on the sarkan mounting ring of the dental root canal H file of the present invention. It is a front view of the conventional dental root canal H file. It is the schematic which shows the point which measures root canal length using the file shown in FIG. It is a front view which shows the state which hold | gripped the file shown in FIG. 3 in the file holder of the apex position detection apparatus. It is a block diagram of a commercially available apical position detection device (for example, a root canal length measurement module).

Explanation of symbols

1 Dental cutting instrument (Dental root canal file)
2 Needle part 3 Blade part 4 Handle part 5 First annular body (Sarcan wearing ring)
6 Second ring (Sarkan)
7 Holder terminal 8 Code 9 Rubber topper

Claims (5)

In a dental cutting instrument comprising a needle part, a blade part formed at one end of the needle part, and a handle part formed at the other end of the needle part, the other end of the needle part in the vicinity of the handle part extending the forming the first annular body to form tracks, one of the ring of the second annular body having a pair of rings in the first annular member rotatably connected to and holder terminal to the other ring And a cord connected to the holder terminal .   The dental cutting instrument according to claim 1, wherein a stopper is fitted to the needle portion.   The dental cutting instrument according to claim 1, wherein the dental cutting instrument is a root canal file.   The dental cutting instrument according to claim 1, wherein the dental cutting instrument is a root canal reamer. The dental cutting instrument according to claim 1, wherein the dental cutting instrument is used for measuring a root canal length.

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