JPS6142580Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is suitable for inserting a filling material such as gutta percha or silver point into the root canal after removing the dental pulp and forming an infected root canal in dental treatment. There is no risk that the tip of these filling materials will protrude into the apical foramen later, and the tip of the filling material will be securely locked at the desired position in the apical root canal, making it easy to insert the filling material. The present invention relates to a reamer and a file that can achieve the desired effect.

[Conventional technology]

Normally, the purpose of treating infected root canals using a dental reamer and dental file is to cut and enlarge the infected part of the root canal dentin wall and completely eliminate it.
The inside of the root canal filled with rotten matter is completely cleaned, and then the root canal is disinfected, the lesion outside the apical foramen is cleaned, disinfection treatment is performed, and the filling material such as gutta percha is filled into the root canal. The goal is to secure a passage within the root canal in order to carry out this procedure.

As described above, various improvements and innovations have been made to the dental reamer and dental file, which play an important role in dental treatment. Registration No. 1461046), the shape and structure of the reamer and file blades have been improved. That is,
The tip part functions as a cutting and perforating blade, the base part of the cutting and perforating blade has the effect of cutting the peripheral wall of the root canal to enlarge the diameter of the root canal, and the rear part is configured to function as a cutting propelling blade. As a result, during use, these functions are synergistically exhibited, reducing treatment time and dramatically increasing the efficiency of treatment work. Incidentally, one of the filling methods that has been commonly used in the past is a method called pressure root canal filling. This filling method involves tightly inserting the glue filling material into the enlarged root canal, and applying pressure using a gutta percha point to fill the root canal without letting the filling material out of the apical foramen. It is something to do.

[Problem that the invention attempts to solve]

However, when performing pressure root canal filling, there is a force that causes the tip of the filling material, such as gutta percha or silver point, to come out from the apical foramen, and if the filling material actually protrudes, There was a risk that this would later become a foreign body and cause the formation of a lesion that would require re-treatment.

In order to prevent such a risk, a step is formed at the root apex, and a so-called apical sheet, which is necessary to hold the tip of a hard filling material such as gutta percha, is formed in this step. However, when performing root canal treatment using a reamer or file with the conventional structure as described above, it is extremely difficult to form the apical sheet, and even if it were possible, it would be extremely difficult to form the apical sheet. It required a high degree of skill and extraordinary care in the work.

[Means to solve the problem]

This invention was devised to solve the above problem, and by making improvements to the reamer and file, it has the original function of removing and enlarging the infected root canal, as well as the gutta percha point. To provide a reamer and a file capable of simultaneously forming a stepped portion, that is, an apical sheet, which prevents a filling material such as silver point or the like from protruding outside the apical foramen, and without requiring special skill and attention. The purpose is to

The dedicated reamer and file for forming a tapered step in the apical root canal of the present invention, which fulfills these purposes, has a helical cutting blade at the tip.
A regular polygonal prism-shaped cutting promotion perforation portion having a smaller diameter than the helical cutting blade portion is provided protrudingly, and the tip portion of the cutting promotion perforation portion is pyramid-shaped, and the tip portion of the helical cutting blade portion is shaped like a pyramid. This is characterized by a tapered stepped portion that is inclined toward the base of the propulsion perforation.

[Function of the invention]

The reamer and file according to the present invention have a regular polygonal prism-shaped cutting driving perforation part having a pyramid-shaped tip and a smaller diameter than the spiral cutting blade, which is protruded from the tip of the spiral cutting blade. First, the root canal wall is cut by the same action as a drill (tool), and the rear spiral cutting blade is guided into the root canal path. When the root canal is enlarged to the required diameter and depth by the spiral cutting blade, the stepped portion where the tapered step between the cutting driving perforation and the spiral cutting blade abuts. It becomes an apical sheet.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, 1 is a special reamer or file for forming a tapered step in the apical root canal according to the present invention, and is equipped with a handle 2 for photographing with a finger. 3 is a spiral cutting blade portion of the reamer or file 1 that performs the main root canal enlargement cutting action;
The material is a thin metal wire with a circular cross section, which is twisted to form a spiral blade around the periphery. Reference numeral 4 designates a regular polygonal column-shaped cutting driving perforation portion which protrudes toward the distal end of the spiral cutting blade portion 3 and has a smaller diameter than the diameter of the spiral cutting blade portion 3. End portion 4 of columnar blade portion 4a of column)
b is formed into a polygonal pyramid shape converging to the apex 4c. 5
is a tapered step continuously formed at the tip of the helical cutting blade 3 toward the base of the cutting propulsion perforation 4; The cutting blade is formed as an extension.

In addition, in the reamer and file of the present invention having the above-mentioned configuration, the top part 4c of the cutting driving perforation part 4 is first inserted into the root canal by alternating rotation in both left and right directions and weak pressing in the advancing direction, and the columnar blade part 4a is inserted into the root canal. The side walls of the root canal are ground by alternating left and right rotations, and the helical cutting blade portion 3 is guided in the direction of the root canal path. On the other hand, the spiral cutting blade part 3 (and tapered step part 5), whose advancing direction is determined by the guiding (guiding) action of the columnar blade part 4a, sequentially expands the peripheral wall of the root canal and removes cutting waste from the root canal. Send outside the canal (towards the crown).

In addition, when forming a root canal of the required diameter, first the diameter of the root canal is enlarged using multiple reamers with different diameters from small to large, and then a file is used to flatten the curved surface of the root canal wall. It is used for correction, enlarging, and cleaning in several stages by using a spiral cutting blade 3 with a progressively larger diameter, but the dimensions of the cutting driving perforation 4 of all the plurality of reamers used at that time are, in principle, constant. shall be.

The root canal formed in this way has a third root canal.
As shown in the figure, a clear tapered step, so-called apical sheet 8, is simultaneously formed at the apical portion 7 of the root canal 6 by the cutting blade of the tapered surface of the tapered step 5. Since the hard filling material 9 such as the gutta percha point is locked onto this apical sheet 8 as shown in the figure, there is no possibility that the hard filling material 9 will protrude outside the apical foramen 10. As a matter of course, the space between the hard filling material 9 and the root canal 6 is ultimately filled with a highly sealing filling material 12 as shown in FIG. In the space below the filling material 9 with the bone part 11, there is a comprehensive action of the filling material that has the sealing properties of the gutta percha point and other adhesive filling materials, and the human body is exposed to the filling material. As a result of the biological reaction, a hard tissue such as cementum is formed in the apical foramen tissue, and the apical foramen is closed (bony scar healing).

In FIGS. 3 and 4, 13 indicates the cementum portion of the tooth, and 14 indicates the dentin portion of the tooth.

[Effect of idea]

However, according to the reamer and file of the present invention, when forming a root canal with a diameter suitable for later filling with a filling material, the hard filling material can protrude outside the apical foramen at the same time as the root canal formation operation is performed. Since it is possible to form a tapered step, that is, an apical sheet, which prevents the formation of an apical sheet, there is no need for a particularly high degree of work skill or special attention to detail, which was conventionally required when forming an apical sheet, and the process can be performed easily and reliably. It became.

In addition, since the cutting propulsion perforation part can also exert a guiding effect to propel the root canal along the root canal path, there is no risk of unnecessary and harmful perforation of the surrounding wall of the root canal due to the wrong direction of expansion of the root canal. It satisfies all the requirements for reamers and files.

[Brief explanation of drawings]

Fig. 1 is a side view of a special reamer and file for forming a tapered step in the apical root canal according to an embodiment of the present invention; Fig. 2 is an enlarged side view of the main part of Fig. 1; Figure 3 is a schematic sectional view showing the state of the root apex after forming a root canal and filling it with a filling material using the reamer and file of the present invention, and Figure 4 shows the state of the root apex after filling is completed. It is a schematic sectional view. 2... Handle portion, 3... Spiral cutting blade portion, 4... Cutting promotion perforation portion, 5... Tapered stepped portion, 6... Root canal, 8... Apical sheet.

Claims (1)

[Scope of utility model registration request] Protruding from the tip of the helical cutting blade, a regular polygonal columnar cutting promotion perforation having a smaller diameter than the helical cutting blade;
A root apex characterized in that the tip of the cutting-propelling perforation part is pyramid-shaped, and the tip of the spiral cutting blade part is a tapered stepped part inclined toward the base of the cutting-propulsion perforation part. A special reamer and file for forming a tapered step in the root canal.