CN201453385U

CN201453385U - Elastic root canal file

Info

Publication number: CN201453385U
Application number: CN2009201330164U
Authority: CN
Inventors: 王中
Original assignee: SHENZHEN SUHANG SCIENCE AND TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHENZHEN SUHANG SCIENCE AND TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2009-06-19
Filing date: 2009-06-19
Publication date: 2010-05-12
Anticipated expiration: 2019-06-19

Abstract

The utility model discloses an elastic root canal file, which comprises a working portion and a handle portion. The section of the working portion is a central symmetrical structure, a wide belt is arranged on the rear side of a cutting edge of the working portion, and the scope of a cutting front angle of the working portion ranges from 0 degree to 25 degrees. Compared with the prior art, the working portion adopting the section with the central symmetrical structure fundamentally solves the problem that a cutting edge portion of an existing root canal file is too weak, low in cutting efficiency and not enough in sharpness, and greatly improves usability, safety and service life of the root canal file.

Description

The elasticity root canal file

Technical field

This utility model relates to the operating theater instruments that a kind of dentist uses, particularly a kind of root canal that is applied to various pulpitiss, pulp necrosis, gangrene, fracture of tooth and the elasticity root canal file that uses when filling.

Background technology

Root canal is to treat the more satisfactory and sophisticated Therapeutic Method of disease such as various pulpitiss, pulp necrosis, gangrene, fracture of tooth at present.Its main process is to use root canal file that pathological changes root pipe inside and root canal wall are thoroughly cleared up, remove pathological tissues, and mould complete, a slick tube cavity, in type pipe, fill other materials then, as gutta percha point etc., the root pipe is repaired and the purpose of treatment to reach.

The structure of existing root canal file is made up of operate portions 2 and shank 1 as shown in Figure 1, and operate portions has certain tapering, and the screw thread uniform distribution is arranged on it, and screw thread has certain helical angle φ.Shown in Fig. 2-1,2-2,2-3, existing root canal file is generally made by rustless steel or NiTi elastic alloy, the operate portions tapering is 2%, be divided into H, K and R type by the cross section, wherein the H type is an one start screw, and helical angle φ is about 75 °, K type and R type are respectively 4 and 3 head thread structures, the cross section is axially symmetric structure (the K type is 90 ° of axial symmetry, and the R type is 120 ° of axial symmetry), and helical angle φ is generally about 45 °.As shown in Figure 3, the rotation by root canal file and lifting in use makes in the root pipe 3 and the pathological tissues on the root inside pipe wall is removed.Wherein H type root canal file mainly carries out in the mode of lifting when work, and root canal wall is carried out straight-cut, and promptly cutting direction is axially consistent with root canal file; And K type and R type root canal file mainly carry out with rotation mode when work, and root canal wall is carried out cross cutting, and promptly cutting direction is axially vertical with root canal file.But for traditional K and R type root canal file, remain in following shortcoming: (1) as shown in Figure 3, because the root pipe generally is bending, for K and R type root canal file, carrying out in when work along with rotation, its operate portions is subjected to periodic flexural deformation, thereby causes being subjected on the cutting edge of root canal file the tensile stress T (as Fig. 4, shown in Figure 5) of alternation; Because the cross section of K and R type root canal file is an axially symmetric structure, too weak in cutting edge place structure, when flexural deformation, can produce the stress concentration of height, cause cutting edge place cracking and fracture.(2) shown in Fig. 6-1,6-2, the cutting anterior angle of general cutting element should be chosen between-5～25 °, but because traditional K and R type root canal file adopt axial symmetry cross section structure, the cutting anterior angle γ of its blade ₀Bigger, the cutting anterior angle γ of K type root canal file ₀Be 45 °, R also (F is a cutting direction among the figure) more than 30 °, thereby influenced its stock-removing efficiency and sharpness.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of elasticity root canal file of strengthening the cutting blade intensity of root canal file and improving stock-removing efficiency and sharpness.

For solving the problems of the technologies described above, this utility model has adopted following technical scheme: a kind of elasticity root canal file, form by operate portions and shank, the cross section of described operate portions is a centrosymmetric structure, the cutting edge rear side of described operate portions is provided with the broadband, and the angular range of operate portions cutting anterior angle is between 0～25 degree.

The centrosymmetric structure in operate portions described in the utility model cross section is three, four, five or six subcenter symmetrical structures, and described operate portions has 3,4,5 or 6 head thread structures.

The tapering of operate portions described in the utility model is the combination of single tapering or 2 and 2 above taperings, and its range of taper is between 2%～12%.

The helical angle of operate portions front end described in the utility model is greater than the helical angle of rear end.

Operate portions described in the utility model and shank be formed in one structure or combined connecting structure.

Operate portions described in the utility model is NiTi elastic alloy, rustless steel or non-metallic elastic material structure.

This utility model compared with prior art, operate portions adopts the cross section of centrosymmetric structure, fundamentally improve the shortcoming that the cutting blade is too weak and stock-removing efficiency is low, sharpness is not enough of existing root canal file, usability, safety and the life-span of having improved root canal file greatly.

Description of drawings

Fig. 1 is the structural representation of root canal file in the prior art.

Fig. 2-the 1st, the schematic cross-section of H type root canal file in the prior art.

Fig. 2-the 2nd, the schematic cross-section of K type root canal file in the prior art.

Fig. 2-the 3rd, the schematic cross-section of R type root canal file in the prior art.

Fig. 3 is the fundamental diagram of root canal file in the prior art.

Fig. 4 is the blade force diagram when K type root canal file is worked in the prior art.

Fig. 5 is the blade force diagram when R type root canal file is worked in the prior art.

Fig. 6-the 1st, the cutting anterior angle γ of K type root canal file in the prior art ₀Sketch map.

Fig. 6-the 2nd, the cutting anterior angle γ of R type root canal file in the prior art ₀Sketch map.

Fig. 7 is the schematic cross-section of this utility model embodiment one.

Fig. 8 is the schematic cross-section of this utility model embodiment two.

Fig. 9 is one of schematic cross-section of this utility model embodiment three.

Figure 10 be this utility model embodiment three schematic cross-section two.

Figure 11 is the structural representation of this utility model embodiment four.

The specific embodiment

The utility model will be further described below in conjunction with drawings and Examples.

As Fig. 7 and shown in Figure 11, this utility model elasticity root canal file is made up of operate portions 2 and shank 1, and the cross section of described operate portions 2 is a centrosymmetric structure, cutting edge rear side in operate portions is provided with the broadband, and the angular range of operate portions cutting anterior angle is between 0～25 degree.The tapering of operate portions is the combination of single tapering or 2 and 2 above taperings, and its range of taper is between 2%～12%.

Operate portions described in the utility model and shank be formed in one structure or combined connecting structure.Because root pipe 3 generally is bending, therefore, operate portions adopts NiTi elastic alloy, rustless steel or non-metallic elastic material structure, all has better elastic, can adapt to the shape of root pipe.

As shown in Figure 7, the cross section of this utility model embodiment one root canal file is a centrosymmetric structure, the cross section is rotated 120 ° with the center and is realized overlapping, and this cross section has three subcenter symmetrical structures, and this root canal file has 3 head thread structures, remain with the broadband at its cutting edge rear side, resist rimose ability to improve root canal file when the flexural deformation, improve its safety and service life, the cutting anterior angle is reduced, reach rational designing requirement, improve its serviceability greatly.The cutting anterior angle γ of this root canal file ₀Scope 0～25 the degree (F is a cutting direction among the figure).

As shown in Figure 8, the cross section of this utility model embodiment two root canal files is rotated 90 ° with the center and is realized overlapping, this cross section has four subcenter symmetrical structures, and root canal file has 4 head thread structures, remains with the broadband at the cutting edge rear side of this root canal file. the cutting anterior angle γ of this root canal file ₀Scope 0～25 the degree.

As Fig. 9, shown in Figure 10, the cross section of this utility model embodiment three root canal files has five times or six subcenter symmetrical structures, and root canal file has 5 or 6 head thread structures, remains with the broadband, the cutting anterior angle γ of root canal file at the cutting edge rear side of this root canal file ₀Scope 0～25 the degree.

The shank 1 of this utility model root canal file and operate portions 2 can be formed by connecting as shown in Figure 1 structures of combination of materials not of the same race, and also can be same material processes as shown in figure 11 structure through one.Wherein, the shank structure can be structure and the shape of setting arbitrarily, the tapering of operate portions can be single tapering, also can be constituted by a plurality of taperings more than 2 or 2, and range of taper is between 2%～12%.Diverse location in operate portions can have different helical angles, in embodiment four of the present utility model, and the helical angle φ of operate portions front end ₂Helical angle φ greater than the rear end ₁

The cross section of this utility model root canal file operate portions is a centrosymmetric structure, rather than axially symmetric structure, remain with the broadband at the cutting edge rear side of root canal file, resist rimose ability when the flexural deformation to improve root canal file, improve its safety and service life, make cutting anterior angle γ simultaneously ₀Reduce, reach rational designing requirement, thereby improve its comprehensive serviceability greatly.

Claims

1. an elasticity root canal file is made up of operate portions and shank, it is characterized in that: the cross section of described operate portions is a centrosymmetric structure, and the cutting edge rear side of described operate portions is provided with the broadband, and the angular range of operate portions cutting anterior angle is between 0～25 degree.

2. elasticity root canal file according to claim 1 is characterized in that: the centrosymmetric structure in described operate portions cross section is three, four, five or six subcenter symmetrical structures, and described operate portions has 3,4,5 or 6 head thread structures.

3. elasticity root canal file according to claim 2 is characterized in that: the tapering of described operate portions is the combination of single tapering or 2 and 2 above taperings, and its range of taper is between 2%～12%.

4. elasticity root canal file according to claim 3 is characterized in that: the helical angle of described operate portions front end is greater than the helical angle of rear end.

5. according to any described elasticity root canal file of claim 1 to 4, it is characterized in that: described operate portions and shank be formed in one structure or combined connecting structure.

6. elasticity root canal file according to claim 5 is characterized in that: described operate portions is NiTi elastic alloy, rustless steel or non-metallic elastic material structure.