KR20100068505A - Hybrid endodontic file - Google Patents

Abstract

PURPOSE: A file of the combining form for root canal treatment is provided, which can apply the gradation of the radial land to the single file structure longitudinally, and improve the maintenance of the center of root canal end and the cutting efficiency of the upper part of root canal at the same time. CONSTITUTION: A file of the combining form for root canal treatment includes: a radial landing portion in which the width(41) of the radial land diminishes in the file shaft direction, while the width of the radial land is the largest in the end part of the file; a transform unit in which the width of the radial land becomes 0; and a blade portion formed from the transform unit in the file shaft direction. The transform unit is located in the position of 30-60% of the file total length. The transform unit is located in the position distanced 6-10mm from the end part of file. The size of the pitch(31) increases gradually from the radial landing portion toward the blade portion.

Description

Hybrid root canal file {Hybrid endodontic file}

The present invention relates to a composite root canal file and a method for manufacturing the same, and more particularly, to a complex root canal file and a method for manufacturing the same, in which a radial land and a blade form are complex to delete the root canal efficiently. It is about.

Endodontics is a specific field of dentistry that involves the treatment of dental pulp and pathoses of the apical tissue. Teeth are nerves and vascular tissues called pulp inside, dentin covered with pulp, and the outermost is composed of hard enamel tissue. Root canal treatment is performed when the pulp tissue, which contains nerves and blood vessels in the teeth, is infected or inflamed.

Root canal treatment of a tooth with dying or dead pulp tissue opens through the access cavity formed in the crown into the internal space of the tooth called the pulp chamber and allows This is done by entering the canal inside the root. Tooth roots buried in the jawbone of the patient to support the teeth have a unique shape and displacement form according to each tooth, and exhibits various root canal shapes. The dentist allows the small canal treatment piles to penetrate through the pulp cavity of each tooth and through each root canal to the distal end, ie the foramina of the root canal, and with a pile larger than the root canal, having a maximum diameter of the canal at the root canal entrance level. It is formed to have a tapered shape having a minimum diameter in the root canal to remove the bacteria in the pulp cavity and root canal, and to give an artificial shape of an appropriate size to fill the root canal with an artificial material.

1A and 1B show a conventional root canal file. Figure 1a shows a cross-sectional view of the file for the root canal treatment, Figure 1b shows a side view of the file for the root canal treatment. 1A and 1B, a pile having a radial land structure has a width 11 of radial land that is constant throughout its entire length. The width 11 of the radial land and the pile center form a predetermined angle 15. The depth change of the flute 12 is large according to the change of the radial land width 11. Thus, the pile inner diameter 14 is relatively small compared to the pile outer diameter 13 surrounding the radial land.

Although the symmetrical structure of the radial land 11 in contact with the root canal wall according to FIGS. 1A and 1B plays an effective role in maintaining the root canal center when the root canal is deleted, the cutting force is increased due to the increase in the contact area with the root canal in terms of cutting force efficiency. There is a problem that is reduced and increases the bitrim force for the file.

2A shows a cross-sectional view of a pile having a conventional blade structure, and FIG. 2B shows a side view of a pile having a blade structure. 2A and 2B, a file having a blade structure always has a constant erase edge throughout its length. The fluctuation in the depth of the flute 22 is small with the change in the radial land width 21. Accordingly, the pile inner diameter 24 surrounding the radial land is about 80% larger than the pile outer diameter 23.

In the case where the radial lands according to FIGS. 2A and 2B do not exist and the blades have an erase blade, the removal efficiency of the root canal dentin is good, but causes the deflection of the root canal to the outward side of the curved canal during shaping of the root canal. There is a problem.

As a result, when viewed from a conventional root canal file, the radial land structure has excellent flexibility, but has a disadvantage in that the torsional rigidity is lowered and the cutting force is low. The blade structure is excellent in rigidity and cutting force, but has a problem in that the pile can be cut during use due to high bending rigidity and lack of flexibility.

U. S. Patent No. 5,921, 775 discloses files for root canal treatment using a nickel-titanium alloy with shape memory, excellent flexibility and strength. Various tapered piles can be bent along the curvature in the root canal in general, and the radial land width can vary with each individual pile, but both the disadvantages of the radial land and the disadvantages of the blade There is no suggestion for a solution.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional root canal file structure, and to gradually apply a radical change of the radial land to a single file structure and maintain the root end center and improve the cutting efficiency of the root canal at the same time. It is to provide a file for the root canal treatment.

In order to achieve the above object, the present invention

A radial land portion having the largest width of the radial land at the tip of the pile and decreasing the width of the radial land toward the pile shaft direction;

A conversion unit of which the width of the radial land is 0; And

It provides a composite root canal treatment pile consisting of a blade portion formed in the direction of the pile shaft from the conversion unit.

In order to solve the above other problem, the present invention

Increasing the width of the radial land at the tip of the pile and decreasing the radial land width toward the pile shaft direction;

Forming a conversion unit in which the radial land width becomes zero; And

Forming a blade portion in the direction of the pile shaft from the conversion unit provides a method of manufacturing a pile for root canal treatment comprising a.

In order to solve the above another problem, the present invention

The radial land portion having the largest width of the radial land at the tip of the pile and decreasing the radial land width toward the pile shaft direction, a converting portion having a width of the radial land being 0, and Provided is an apparatus for root canal treatment employing a composite pile consisting of a blade portion formed in the direction of a pile shaft.

The composite root canal file having the width of the progressive radial land of the present invention is crowned by efficient enlargement of the upper root canal while maintaining the root canal center maintenance characteristic, which is an advantage of the general radial land structural file, at the proximal end. down) can maximize the efficiency of the root canal molding.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a radial land portion having the largest width of the radial land at the tip of the pile and decreasing the width of the radial land toward the pile shaft direction; A conversion unit of which the width of the radial land is 0; And a blade portion formed in the direction of the pile shaft from the converting portion.

According to the present invention, it is possible to obtain a combined file for the root canal treatment composed of a combination of the radial land and the blade. In the case of a file having only a radial land structure, the erase force is reduced by having the same pitch interval and the width of the radial land. In addition, in the case of a pile having only a blade structure, the root canal center is biased after the deletion of the curved root canal due to excessive deletion force. Therefore, it provides a file for the root canal treatment that includes the characteristics of the radial land structure and the characteristics of the blade structure at the same time.

Figure 3 shows a complex root canal treatment pile consisting of a radial land portion and a blade portion according to an embodiment of the present invention. Referring to Figure 3, from the leading end of the pile (중앙) to the central portion of the pile length of the radial land pile, it can be seen in the composite root canal treatment pile is configured in the form of a blade toward the shaft. The width 31 and the pile center of the radial land form a predetermined angle (center angle, 35). In addition, the depth change of the flute 32 is accompanied by the change of the radial land width 31 at the same time. The depth of the flute 32 becomes shallower with the reduction of the radial land width 31. The minimum inner diameter 34 of the pile is preferably at least about 60% of the outer diameter 33.

In FIG. 3, the blade-shaped structure can be seen that the radial land width 41 becomes 0 and the depth of the flute 42 becomes shallow. The maximum inner diameter 44 in the blade-shaped pile is preferably about 80% or less of the outer diameter 43.

The present invention is to reduce the width of the radial land from the tip of the pile to the shaft portion in order to compensate for the problems of the single-sectional shape pile consisting only of the radial land or blade and to have the advantages at the same time. When comparing the positions of the root canal centers before and after deleting the root canal using a file, the more similar the position of the root canal is, the better it can maintain the center of the root canal and better follow the mechanical purpose of root canal expansion. In this regard, piles with radial lands generally maintain the center of the root canal well. In addition, the crown-down molding method, which uses nickel titanium piles, reduces the curvature by enlarging the upper canal, thereby making it easier to make the instrument approach to the lower curved root canal and to make contact with the instrument to be used at the lower part easier. This can reduce instrument fracture. This has the effect of reducing the displacement to the curved outer axis caused by the reaction force of the mechanism. Therefore, placing the blade structure on the upper part of the pile improves the removal efficiency, facilitates instrument access to the lower root canal, and further increases the effect of reducing the lateral displacement of the root canal in the curved root canal.

In the present invention, the tip of the root canal pile has a structure of a radial land that can maintain the center of the root canal well, and the blade structure for increasing the root canal removal efficiency and the efficiency of the crown down molding method is shared at the curved upper portion.

In the root canal treatment pile of the present invention, the radial land portion maintains a sufficient width to maintain the root canal center well in use of the root end portion of the pile. The land width of the radial land portion is gradually reduced to convert the radial land width to zero. In this way, the point where the land width becomes zero first is called a conversion unit. In other words, the conversion unit can be said to be a point that separates both parts in the composite root canal treatment pile composed of a radial land portion and a blade portion.

The conversion part means a point where the width of the radial land part gradually decreases, and the width disappears. The conversion part has a radial land-free structure so as to maximize the efficiency of enlargement of the upper root canal with the increase of the erase force in the direction of the blade part after the conversion part. Is done.

The taper and the size of the file are different depending on the specific purpose of the root canal treatment. Depending on the size of the file, the point of the conversion part can be adjusted to some extent. In the file of the present invention, the conversion unit may be arranged at a point of 30 to 70% from the top of the file in the total file length. Preferably, the conversion unit is disposed at a point of 40% to 60% of the total length of the file. Most preferably, the converter is placed at about 50% of the total length of the file. If the converter is located about 50% of the length of the entire erased edge, the radial land and the blade will be symmetric.

4A-4C illustrate one embodiment according to the present invention. Referring to FIG. 4A, the converter having a radial land width of 0 is located at the center of the file. Referring to FIG. 4B, the converter is located at the bottom of the file. Is located. As described above, the conversion part of which the width of the radial land is 0 can be variously manufactured according to the size or taper of the file, and can be arbitrarily selected by the user in clinical practice.

When the conversion unit is based on the length of the erased edge of the standard file, 16 mm, it is preferably located 6 to 10 mm from the top of the file. The point where the conversion unit is located can be manufactured by selecting appropriately as described above, but it is desirable to be located at a point of 6 to 10mm considering the length of a conventional pile. In general, when the taper of the pile is large, the entry into the root canal is limited to a short time and is used more to enlarge the root canal. The pile that enters the root end over the entire length of the root canal is mainly a small taper. In this case, it is better to have a radial land structure to secure flexibility and maintain the root canal center. It is preferable to extend the land portion.

It is preferable that the size of the pitch increases from the radial land portion to the blade portion. This is because as the pitch of the pile increases toward the top, the flexibility of the pile increases and the moving speed of the residue deleted by the pile flute increases. The width and number of pitches determine the width of the radial land.

5 shows a pitch in a pile according to the present invention. Referring to FIG. 5, it can be seen that the length of the pitch 48 increases as the shaft progresses from the tip of the pile. In the radial land portion, the width of the land may be gradually reduced and accompanied by the blade pitch.

In the root canal treatment pile according to the present invention, it is preferable that the material of the pile is a nickel-titanium alloy. In general, the conventional endodontic piles are mainly used for stainless steel, but recently, nickel-titanium is used, and it is preferable to use nickel-titanium to maximize the effect of the composite pile.

The angle (center angle) between the width of the radial land and the pile center is preferably 0 ° to 21 °. The maximum angle between the pile center and the radial land width is 21 °, and the central angle decreases as the width of the radial land decreases. The point where the angle (center angle) becomes 0 ° is the transition point where the width of the radial land becomes zero. The width of the radial land starting at an angle of 21 ° from the attached section is gradually reduced as it moves upwards with the flute rotation to form a blade-shaped structure without the width of the radial land from the transition point.

As the width of the land decreases in the radial land portion, the depth of the flute becomes shallower, which leads to an increase in the inner diameter of the pile, which increases the bending rigidity and the reaction force of the pile. Can increase the erase power.

The pile minimum inner diameter according to the present invention is about 60% of the outer diameter and this value can be measured at the tip section, and the pile maximum inner diameter is about 80% of the outer diameter and can be measured at the converter section. Therefore, the inner diameter of the pile in the radial land portion is preferably 60 to 80% of the outer diameter.

Figure 6 shows a detailed view of the change in the width of the radial land. Referring to Figure 6, it can be seen that the change in the cross-section showing the gradual decrease of the radial land and the depth decrease of the flute. The width of the radial land in the cross section shows a gradual change in the maximum angle from 21 ° to 16 °, 12 ° and 0 ° as the center angle, and the change angle is merely an example to illustrate an embodiment. It is not limited to the said angle.

Radial Land's symmetrical structure makes contact with the root canal wall to help maintain the root canal enlargement while maintaining the root canal center. However, in the efficiency of the cutting force, the cutting force is reduced due to the increase in the contact area with the root canal. However, as the radial land width increases, the area of contact with the root canal wall increases the torsional stress on the pile and the possibility of torsional fracture of the pile when the pile is rotated in the root canal.

The blade portion without the radial land has a blade-shaped blade, which increases stiffness, excellent cutting force and high root canal force. If the rigidity of the pile is increased, it is difficult to follow the curvature when the curved root canal is enlarged, and the dysplasia such as transportation, zip or elbow is more likely to occur at the lower end of the curvature, making it difficult to form an ideal root canal filling.

Therefore, as in the present invention, by including the radial land portion, the cross-sectional area of the pile is reduced, flexibility is increased, and the pile can be easily entered along the curved root canal. It also enables molding with smooth tapering from the root to the root canal while maintaining the curvature of the root canal.

According to another embodiment of the present invention, the width of the radial land at the tip of the pile is largest and the width of the radial land is reduced toward the pile shaft direction; Forming a conversion part in which the width of the radial land is zero; And forming a blade portion in the direction of the pile shaft from the converting portion.

According to another embodiment of the present invention, the radial land portion having the largest width of the radial land at the tip of the pile and decreasing the width of the radial land toward the pile shaft direction, and the width of the radial land is zero. The present invention provides a device for root canal treatment employing a composite pile consisting of a conversion unit and a blade unit formed in the direction of a pile shaft from the conversion unit.

1A and 1B show pile cross-sectional and side views of a radial land structure according to the prior art.

2A and 2B show pile cross-sectional and side views of a blade structure according to the prior art.

Figure 3 shows an embodiment of a composite root canal pile consisting of a radial land portion and a blade portion according to the present invention.

Figures 4a to 4c show the long axis contour view changed to blade shape after the gradual reduction of the radial land width according to the present invention.

Fig. 5 shows the pitch in the pile according to the present invention.

Fig. 6 is a gradation diagram showing a decrease in the radial land width according to the present invention, showing a gradual decrease in the radial land and a decrease in the depth of the flute.

<Explanation of symbols for main parts of drawing>

11: raidal land 12: flute

21: blade 22: flute

31: pitch

Claims (9)

A radial land portion having the largest width of the radial land at the tip of the pile and decreasing the width of the radial land toward the pile shaft direction; A conversion unit of which the width of the radial land is 0; And The composite root canal treatment pile, characterized in that consisting of a blade portion formed in the file shaft direction from the conversion unit. The method of claim 1, wherein the conversion unit is a composite root canal file, characterized in that located in the 30% to 60% of the total length of the file. The method of claim 1, wherein the conversion unit is a composite root canal file, characterized in that located 6 to 10mm from the pile tip. The method of claim 1, wherein the size of the pitch increases from the radial land portion to the blade portion. The composite root canal treatment pile according to claim 1, wherein the material of the pile is a nickel-titanium alloy. The pile root canal treatment pile according to claim 1, wherein an angle formed by the width of the radial land and the pile center is 0 ° to 21 °. The pile root canal treatment file according to claim 1, wherein the maximum inner diameter of the pile comprises 60 to 80% of the outer diameter of the radial land portion. Increasing the width of the radial land at the tip of the pile and decreasing the radial land width toward the pile shaft direction; Forming a conversion unit in which the radial land width becomes zero; And Forming a blade portion in the direction of the pile shaft from the conversion unit; The manufacturing method of the composite root canal treatment characterized in that it comprises a. A device for root canal treatment, characterized in that the combination of the file for any one of the complex root canal treatment of any one of claims 1 to 7.

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