JP5384876B2 - Root canal filling device and method of using the same - Google Patents

Description

  The present invention relates to a root canal filling device that fills a root canal with gutta-percha points in accordance with a vertical pressurization method, and a method of using the root canal filling device, and relates to a technique for accurately and easily filling gutta-percha points into a root canal.

  In the treatment of infected root canals and the like, after extraction, the root canal is enlarged as necessary and then filled with a predetermined dental filler. The fillers to be used are roughly classified into those having an initial paste-like viscosity and being cured with time, and those having an initial rubber-like hardness that are softened by heating or a solvent and cured again by cooling. . The former filling material can be filled into the root canal using a syringe and the filling density can be increased by its viscosity. However, since it takes time to cure, the latter is currently mainly used for filling the root canal. is there.

  More specifically, the latter filler is called gutta percha (self-named: gutta percha), and the shape is a sharp needle-like shape, and it can be softened by dipping in eucalyptus oil in addition to a flame. it can. The root canal filling method using the gutta-percha point includes a horizontal pressing method and a vertical pressing method. The horizontal pressurization method is also referred to as a lateral pressurization method, and a plurality of points are densely inserted into a bundle in the root canal and can be operated relatively easily. It is difficult to increase the packing density. On the other hand, the vertical pressurization method is also called the opian carrier method, in which points are packed vertically (vertically) in the root canal, and the filling density is higher than the horizontal pressurization method, so the root canal is surely Can be filled.

  However, the conventional vertical pressure method is difficult to align the tip of the gutta-percha point with the root canal opening, and relied on experience and intuition to do this accurately. In addition, since the gutta-percha point is very thin and fragile, if the point is inserted while the axis with respect to the root canal opening is shifted, it is easily bent or broken. Furthermore, in the case of a light axis deviation, there is also a problem that the softened portion of the point adheres to the inner wall of the root canal and subsequent filling becomes difficult. In particular, when the affected tooth is a back tooth, it is difficult to align the tip of the point because the root canal cannot be directly viewed from directly above.

  In order to solve such a problem of the vertical pressurization method, a root canal filling device has already been proposed in which a slidable line is slidably inserted into a hollow thin tubular support tube in which a gutta percha point is inserted and held (patent) References 1, 2). These root canal filling devices hold the gutta-percha point at the tip of the support tube, align the tip with the root canal opening, and then push in the piercing line so that the gutta-percha point is filled into the root canal relatively accurately. can do.

Japanese Utility Model Publication No. 62-152708 Japanese Utility Model Publication No. 63-151115

  However, in the root canal filling device described in Patent Documents 1 and 2, since the support tube is straight, it is difficult or impossible to fill the root canal with respect to the back teeth. Also, since the gutta percha point is completely embedded in the support tube before filling, the only way to soften this is to heat the support tube together. Therefore, the filling operation cannot be performed until the support tube is cooled, and the softened gutta-percha point may return to the cured state again when the support tube is cooled. Note that the softening process of the gutta percha point is an indispensable work process for the vertical pressurization method. Therefore, when root canal filling is attempted without this softening process, it is of course impossible to perform dense root canal filling. It is.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a root canal filling device that can easily position a gutta-percha point on a root canal and can perform root canal filling more densely. That is.

In order to achieve the above-mentioned object, the root canal filling device of the present invention is a dental instrument for filling a root canal with a gutta-percha point in accordance with the vertical pressurization method, and includes a needle tube and a midline inserted through the needle tube. The needle tube has an inner diameter that can be inserted and held in a state in which a part of the gutta-percha point protrudes from the tip side, and is bent in a curved manner in the middle of the gutta-percha point insertion part. The wire is longer than the needle tube, has flexibility over the entire length by being inserted from the other end of the needle tube, and after the gutta-percha point inserted and held at the distal end side of the needle tube. The thickness of the gutta-percha point can be pushed by pushing the end with the tip. In the present invention, the needle tube positions the gutta-percha point to the root canal opening and guides the push-out operation of the gutta-percha point as a middle-line sliding cylinder. In particular, since the needle tube is bent halfway, it can be easily inserted into the oral cavity. The middle line is inserted from the other end of the needle tube, pushes the gutta-percha point held at one end of the needle tube at the tip, and fills the root canal with the point. By deforming into a shape corresponding to this when passing through the needle tube, the needle tube slides freely.

  Further, in the present invention, the needle tube has an outer diameter that can enter the root canal opening, and includes a stopper that abuts the root canal opening on the outer periphery thereof and regulates the depth of penetration into the root canal at one end of the bent portion side. Therefore, by measuring the root canal length in advance and aligning the gutta-percha points to the appropriate length, it is possible to fill the root canal properly without protruding the gutta-percha points from the apical hole. Can be performed.

  Furthermore, since the stopper is provided so as to be slidable in the axial direction with respect to the needle tube, the penetration depth of the needle tube can be appropriately adjusted in accordance with the total length of the root canal length and the gutta-percha point.

  Furthermore, the needle tube is integrally provided with a flange-like needle base that can be hooked on the outer periphery, and the center line is integrally provided with a flange-shaped needle base that can be finger-fitted to the rear end. By filling the index finger and the middle finger (or the middle finger and the ring finger) and pressing the middle line group with the thumb, root canal filling can be performed in the same operation manner as the syringe.

  In addition, this instrument is to hold a gutta-percha point inserted into one end of the needle tube in a state where the middle line is pulled out for a predetermined length. The protruding portion of the gutta-percha point exposed from the needle tube is softened by dipping in eucalyptus oil. Therefore, the portion inserted into the needle tube of the gutta percha point is still hard and can be reliably pushed out by the midline, and the root canal can be filled with the softened portion of the gutta percha point.

  As described above, according to the root canal filling device of the present invention, the needle tube is bent in the middle so that the needle tip can be easily inserted into the back teeth. Therefore, it is possible to easily and reliably align the gutta-percha point inserted and held in the needle tip with respect to the root canal. In addition, since the needle tube has an outer diameter that can enter the root canal opening, the alignment is more reliable, and the penetration depth of the needle tip with respect to the root canal is made constant by the stopper. It is possible to prevent overfilling and underfilling that protrude from the surface. Furthermore, since the stopper can change the position by sliding on the needle tube along the axis, the penetration length of the needle tip can be adjusted according to the root canal length or the like. Furthermore, according to the method of using the root canal filling device of the present invention, since the heating operation can be omitted as a means for softening the point while ensuring the dense filling of the gutta-percha point, the filling operation can be performed more easily. .

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded view showing an embodiment of a root canal filling device according to the present invention, which is composed of two members, a needle tube 1 and a middle wire 2.

  The needle tube 1 is a hollow thin tube having both ends opened. The inner diameter of the needle tube 1 is matched with the diameter of the gutta-percha point to be used so that the point can be inserted and held at one end. Further, the middle portion near one end of the needle tube 1 is bent in a curved shape to form a bent portion 1a, and a flange-like needle base 1b that can be hooked with a finger is integrally provided on the outer periphery closer to the other end than the bent portion 1a. . Furthermore, in the case of this embodiment, the outer diameter of the needle tube 1 is set smaller than the root canal opening, and a stopper 1c that abuts the root canal opening and regulates the penetration depth of the needle tip with respect to the root canal on the outer periphery thereof. Provided. The stopper 1c is shaped like a donut that is slidably inserted into the needle tube 1, and the position on the needle tube is changed by sliding to accommodate different root canal lengths.

  The formation position and angle of the bent portion 1a are set to such an extent that the needle tip of the needle tube 1 can be inserted into the root canal of the back tooth even when the affected tooth is the back tooth. At the same time, since the middle line 2 inserted from the other end is inserted toward one end, the bent portion 1a needs to have an obtuse angle in addition to a curved shape, but the specific angle is not limited. .

  On the other hand, the solid solid line 2 is inserted from the opening on the other end side of the needle tube 1 and is flexible so as to bend along the bent portion 1a when passing through the bent portion 1a of the needle tube 1. Deforms and slides in the needle tube 1 over its entire length. The middle line 2 has a length and a thickness that allow the gutta-percha point inserted and held in the needle tube 1 to be pushed out at the tip. That is, the length of the middle line 2 is set to be the same as or slightly longer than the entire length of the needle tube 1, and the thickness is set to be equal to or smaller than the inner diameter of the needle tube 1 and not easily deformed when the gutta-percha point is pushed out at the tip. Reference numeral 2a denotes a finger-shaped flange-shaped middle line base provided integrally with the rear end of the middle line 2.

  Further, in this embodiment, the midline 2 is also formed in a curved shape in the middle of the distal end like the needle tube 1 from the beginning. Accordingly, when the center line 2 is completely pushed into the needle tube 1 and the gutta-percha point is pushed out, the center line 2 is coaxial with the needle tube 1, so that the rear end center of the gutta-percha point can be grasped at its tip, and accurate root canal filling is possible. However, the middle line 2 may initially be a complete straight line. What is necessary in the present invention is to provide flexibility so as to deform along the internal shape of the needle tube 1 so that the tip does not get stuck at the bent portion 1a of the needle tube 1, thereby pushing out the gutta-percha point to the end. It is made to slide like.

  Further, the material of the needle tube 1 and the middle wire 2 is, for example, stainless steel, but may be other materials conventionally used for dental instruments.

  Next, a method of using the present filling device (this device) having the above configuration will be described with reference to FIG. First, as shown in FIG. 2A, the middle line 2 is slightly pulled out from the needle tube 1, and a margin for inserting the gutta-percha point G at one end of the needle tube 1 is secured. Needless to say, the needle tube 1 and the middle wire 2 are cleaned, disinfected, and sterilized in advance.

  Then, as shown in FIG. 2 (b), the gutta-percha point G is inserted into one end of the needle tube 1. At this time, the entire gutta-percha point G is not embedded in the needle tube 1, but for example, about half length. The other half length is inserted and protruded from the needle tube 1 in an exposed state. The protrusion length of the gutta-percha point G may be set so as to satisfy at least the first stage of root canal filling. For example, when filling the gutta-percha point G having a total length of 8 mm with respect to the root canal having an 18 mm root canal length, about 4 mm. Is projected from one end of the needle tube 1. However, it is necessary to insert the gutta-percha point G to such an extent that the gutta-percha point G does not easily come out during the softening operation described later. When the gutta-percha point G is set in the device as described above, the protruding portion of the gutta-percha point G is immersed in eucalyptus oil before filling, and the portion is softened.

  Subsequently, before the softened portion of the gutta percha point G is cured, as shown in FIG. 2C, the device is positioned on the affected tooth, and one end of the needle tube 1 is held until the stopper 1c comes into contact with the root canal opening. Insert into root canal with gutta-percha point G. At this time, since one end of the needle tube 1 is bent as described above, it is easy even for affected teeth that are difficult to visually recognize and work, such as the distal roots or the close relatives of the back teeth (Nos. 7 and 8). One end of the needle tube can be positioned at the root canal opening. Therefore, naturally, the burden on the patient can be reduced. Furthermore, since the stopper 1c contacts the root canal opening and an appropriate penetration depth is ensured, appropriate filling is possible.

  When the positioning of the needle tube 1 with respect to the root canal of the affected tooth, that is, the gutta-percha point G, is completed, the needle base 1b of the needle tube 1 is held while the needle tube 1 is sandwiched between the index finger and the middle finger or the middle finger and the ring finger. The gutta-percha point G can be press-fitted into the root canal in the same manner as the syringe by pressing the midline base 2a of the midline 2 with the belly of the thumb.

  At this time, since the insertion portion of the gutta-percha point G that is in the needle tube 1 and is pressed at the tip of the midline 2 is in an initial cured state, the pressing force related to the midline 2 is transmitted to the gutta-percha point G as it is. The root canal can be reliably filled with the gutta-percha point G. On the other hand, the portion protruding from the needle tube 1 of the gutta percha point G exhibits eucalyptus oil to exhibit lubricity and is in a softened state, so it is of course not only a straight and large root canal that is relatively easy to fill. Even a narrow root canal or a curved root canal can be filled densely. Further, when the gutta percha point G is softened, no heating means is required, so that the filling operation can be performed quickly.

  In addition, the work to be performed before root canal filling, that is, root canal formation (root canal enlargement), is performed by a conventional method using a file or a reamer. Further, in forming the root canal, in order to prevent excessive enlargement of the apical hole, it is the same as before that an apical stopper and an apical sheet are formed as necessary. Furthermore, when the strength of the affected tooth is reduced due to root canal formation or the like, and the possibility of breakage is expected, the fiber core post zone is also formed in advance.

  Up to this point, the treatment method according to the vertical pressure method using the root canal filling device of the present invention has been described. However, when straight roots are filled with the gutta-percha point, root canal formation from the apical hole to the 35th position with a reamer or file After that, you can proceed with the same procedure as described above using this instrument.

The exploded view of the root canal filling device concerning one embodiment of the present invention. Explanatory drawing which showed the usage method of the above-mentioned root canal filling device for every procedure

Explanation of symbols

1 Needle tube 1a Bending portion 1b Needle base 1c Stopper 2 Middle line 2a Middle line base

Claims (4)

A dental instrument that fills the root canal with gutta-percha points according to the vertical pressurization method, comprising a needle tube and a midline inserted through the needle tube, the needle tube partially protruding the gutta-percha point from the tip side. The inside of the gutta-percha point is bent in a curved shape, while the middle line is longer than the needle tube and extends from the other end of the needle tube. From the thickness that can be inserted and passed through the mid-bend portion over the entire length, and that the gutta-percha point can be pushed out by pushing the posterior end of the gutta-percha point inserted and held on the distal end side of the needle tube A root canal filling device characterized by The root canal filling device according to claim 1, wherein the needle tube has an outer diameter that can enter the root canal opening, and a stopper that abuts the root canal opening and regulates the penetration depth is provided on an outer periphery thereof. The root canal filling device according to claim 2, wherein the stopper is slidable in the axial direction with respect to the needle tube. A flange-like needle base that can be hooked with a finger is integrally provided on the outer periphery of the needle tube, and a flange-shaped middle line base that can be touched with a finger is integrally provided at the rear end of the middle line. 3. A root canal filling device according to 3.

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