CN111098101A - Novel root canal file processing technology and root canal file - Google Patents
Novel root canal file processing technology and root canal file Download PDFInfo
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- CN111098101A CN111098101A CN202010039828.3A CN202010039828A CN111098101A CN 111098101 A CN111098101 A CN 111098101A CN 202010039828 A CN202010039828 A CN 202010039828A CN 111098101 A CN111098101 A CN 111098101A
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- 210000004262 dental pulp cavity Anatomy 0.000 title claims abstract description 57
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 190
- 239000002184 metal Substances 0.000 claims abstract description 190
- 239000002131 composite material Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 29
- 210000001161 mammalian embryo Anatomy 0.000 claims description 22
- 238000010622 cold drawing Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 9
- 238000000137 annealing Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 210000002242 embryoid body Anatomy 0.000 abstract 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 210000004268 dentin Anatomy 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/40—Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
- A61C5/42—Files for root canals; Handgrips or guiding means therefor
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- Oral & Maxillofacial Surgery (AREA)
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- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The invention provides a novel root canal file processing technology and a root canal file, and provides a root canal file processed by adopting a composite embryoid body technology aiming at the defects of expensive materials, high processing cost and low processing efficiency of the root canal file in the prior art. The blank of the root canal file is a composite blank formed by drawing and compounding two or the same material, and then a handle, a connecting rod and a file body are respectively processed on different parts of the composite blank. The process has the advantages that the inner material and the outer material can be flexibly matched, the metal pipe and the metal rod of the composite blank body can be made of different materials, the use effect is not influenced while the material of the file body is ensured to meet the operation requirement, and the cost is convenient to control. When the screw thread of the file body is screwed, two connected composite blanks are simultaneously screwed, finally the blanks are cut off at the midpoint position, the processing of two root canal files is simultaneously completed, and the processing efficiency is improved.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a novel root canal file processing technology and a root canal file processed by the technology.
Background
The machine-used titanium-nickel alloy root canal file appears in the last 90 th century, and is popularized and applied in China around 2010, so that the level and efficiency of root canal treatment in the department of oral medicine are greatly improved. Particularly in the preparation of complex and fine root canals, it has significant advantages over conventional stainless steel root canal files. Compared with a stainless steel file body, the nickel-titanium alloy file body has the characteristics of good elasticity, low hardness, good flexibility and the like, can complete the preparation of the root canal in a shorter time, and simultaneously avoids excessive cutting of dentin in the root canal, thereby being deeply favored by oral clinicians.
Because nickel titanium alloy is expensive, and the root canal file is disposable consumptive material, for reduce cost, the titanium nickel alloy root canal file on the existing market all adopts the nickel titanium file body and stainless steel handle to process production respectively. The nickel-titanium alloy material has poor welding performance and cannot be combined with the stainless steel handle in a welding mode, so that all manufacturers assemble the nickel-titanium alloy material and the stainless steel handle in a gluing or assembling mode. The assembly process generally has the problems of poor cohesive structure strength, difficulty in ensuring assembly accuracy and the like. In particular, in the application of the product, that is, when the product is assembled on a root canal motor and is rotated and ground at a high rotating speed, the root canal is easy to loosen and even separate, which brings about extremely adverse effects on the treatment of an oral clinician.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a root canal file processing technology for firstly compounding and manufacturing an embryonic body by a plurality of layers of materials and then processing a handle and a file body in an integrated or split mode, and a root canal file processed by the technology. Compared with the prior art using a single material, the composite blank body can be overlaid with other materials with good welding performance, the problem of poor welding performance of nickel-titanium alloy is solved, the utilization rate of expensive materials is greatly reduced, the efficiency of the processing process is improved, and the manufacturing cost of the root canal file is greatly reduced.
The technical scheme of the invention is as follows:
a novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod; s2, cold-drawing the composite blank;
material reduction processing:
t1 divides the composite embryo body into a connecting rod and a file body; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod; t2, processing the file body into a cone with a thread on the outer surface by a grinding method; t3 secures an otherwise machined handle to the connecting rod.
A novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod; s2, cold-drawing the composite blank;
material reduction processing:
t1' cutting out the composite embryo body with length twice as long as the connecting rod and the file body; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod; t2' takes the middle point of the compound embryo body as the center, symmetrically divides the two sides into a file body and a connecting rod, wherein the file body parts on the two sides are connected at the middle point; t3' is provided with a first twisting end and a second twisting end at the approximate midpoint of the filing bodies on the two sides respectively, and the first twisting end and the second twisting end are fixed and rotate oppositely respectively to form threads between the first twisting end and the second twisting end; t4' sets the screw thread; t5 ' is respectively and symmetrically provided with a third screwing end and a fourth screwing end at the far middle positions of the first screwing end and the second screwing end of the files at two sides, and the steps T3 ' and T4 ' are repeated to finally obtain the state that the thread distribution of the files at two sides presents the state that the middle part is tight and the two ends are sparse; t6' cuts off the files at the middle point; t7' secures an otherwise machined handle to the connecting rod.
In the T3 or T7', the handle and the connecting rod are assembled in an interference fit mode, namely the part of the file body inserted into the bottom hole of the handle is slightly larger than the bottom hole in size; or welding, namely after the upper part of the connecting rod is plugged into the hole at the bottom of the handle, welding the connecting rod and the handle together at the connecting part.
A novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod; s2, performing cold drawing on the composite blank, wherein the cold drawing deformation is 20-50%;
material reduction processing:
t1' cutting out the compound embryo body with the length twice that of the root canal file; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod; t2' takes the middle point of the compound embryo body as the center, symmetrically divides the two sides into a handle, a file body and a connecting rod, wherein the file body parts on the two sides are connected at the middle point; t3' sets the first twisting end and the second twisting end at the middle point of the file body at the two sides, and fixes the first twisting end and the second twisting end and rotates them oppositely, forms screw thread between the first twisting end and the second twisting end; t4' for setting the screw thread; t5 ' sets the third and fourth twisting ends symmetrically on the far middle position of the first and second twisting ends of the file body on both sides, repeats the steps T3 ' and T4 ', finally obtains the state that the screw distribution of the file body on both sides presents the tight middle and two sparse ends; t6' cutting off the files at the middle point; t7' shapes the handle.
In the T1, T1' or T1 ", the metal tube thickness of the tie bar portion remaining is 0.05-0.4 mm.
Step S1 specifically includes: s1.1, removing the central part of the metal rod to form a metal pipe with a hollow structure; s1.2, placing the metal rod into a hollow structure of the metal pipe, wherein the cross section shape of the metal rod is adapted to that of the hollow structure; s1.3, integrally drawing and annealing the composite of the metal pipe and the metal rod for one time or a plurality of times, wherein the annealing temperature is 600-900 ℃; s1.4, performing cold drawing on the composite body of the metal pipe and the metal rod until the diameter of the composite body is slightly larger than or equal to the diameter of a handle required by a root canal file to form a composite embryo body; the cold drawing deformation is 20-50%, preferably 30-40%.
A root canal file made by the process is characterized in that: the metal pipe comprises a metal pipe and one or more metal rods, wherein the shape of the inner surface of the metal pipe is matched with the shape of the outer surface of each metal rod; the metal rod is arranged in the metal pipe, and the metal pipe forms a compact package outside the metal rod; the file body of the root canal file and the connecting rod are integrated, and the connecting rod is fixed with the handle; the metal pipe of the file body part is removed, and the metal rod inside is exposed outside; the metal rod of the file body part is a cone with a thread on the surface.
A root canal file made by the process is characterized in that: the metal pipe comprises a metal pipe and one or more metal rods, wherein the shape of the inner surface of the metal pipe is matched with the shape of the outer surface of each metal rod; the metal rod is arranged in the metal pipe, and the metal pipe forms a compact package outside the metal rod; the file body, the connecting rod and the handle of the root canal file are integrated, the metal pipe of the file body is removed, and the metal rod inside is exposed outside; the metal rod of the file body part is a cone with a thread on the surface.
The metal tube of the outer layer of the connecting rod is partially removed, and the remaining thickness is 0.05-0.4 mm.
The cross section of the file body is continuously changed from the handle direction to the tip direction.
The cross section of the file body is gradually changed from the handle direction to the tip direction, and the cross section can be a triangle, a regular triangle, a rectangular curved side quadrangle, two staggered semicircles or a four-tooth arris shape with a concave bevel edge.
The size of an included angle between the inclined direction of the thread of the file body and the radial direction of the file body is continuously changed from the direction of the handle to the direction of the tip.
The contained angle is from handle direction toward most advanced direction grow gradually, or the contained angle reduces gradually toward most advanced direction from handle direction, or little, both ends are big in the middle of the contained angle, or big, both ends are little in the middle of the contained angle.
The invention has the following technical effects:
the invention provides an integrated root canal file processed by adopting a composite embryo body process, aiming at the defects of expensive materials, high processing cost and low processing efficiency of the root canal file in the prior art. The blank of the root canal file is a composite blank formed by drawing and compounding two or the same material, and then a handle, a connecting rod and a file body are respectively processed on different parts of the composite blank. The process has the advantages that the inner material and the outer material can be flexibly matched, the metal pipe and the metal rod of the composite blank body can be made of different materials, the use effect is not influenced while the material of the file body is ensured to meet the operation requirement, and the cost is convenient to control.
Further, when the handle and the connecting rod are processed in a split mode and then welded and fixed, the metal layer reserved outside the connecting rod can be made of metal materials with good welding performance, and therefore welding reliability between the connecting rod and the handle is greatly improved.
Further, when the screw thread of the file body is screwed, two connected composite blanks are processed simultaneously, two screwing ends are symmetrically fixed by the middle point of the composite blanks, and the two screwing ends rotate oppositely to screw. And repeating the operation step by step to superpose the threads on the file body, so that the file body with the threads with gradually increased density is formed between the connecting rods. Finally, the cutting is carried out at the midpoint position, the processing of the two root canal files is completed simultaneously, and the processing efficiency is improved.
Furthermore, the composite blank process of the invention enables the metal rod and the metal pipe to be properly deformed by synchronously drawing and annealing for a plurality of times after the metal rod is placed in the metal pipe, and the metal pipe tightly wraps the metal rod or the metal rod bundle inside the metal pipe, thereby enabling the metal pipe and the metal rod to form a stable connection structure. The combination of two different or identical metal materials with high strength and complete seamless performance has strength far superior to that of gluing and mechanical assembling. When the file is manufactured, because the material reduction processing is directly carried out on the whole blank, the processing technology is continuous and has no error superposition, thereby simplifying the processing technology and improving the accuracy.
Further, since the shape of the inner surface of the metal pipe is matched with the shape of the outer surface of the metal rod, the sectional shape of the metal rod is a circle, an ellipse, or a polygon having a protrusion. In carrying out the root canal operation in-process, when using the root canal file to grind the brill operation, because the metal pipe closely wraps up the metal rod, relative displacement can not take place for file body and handle, even do not have welding or bonding between metal pipe and the metal rod, also can guarantee that the root canal file has high performance of controlling at the operation in-process.
Drawings
FIG. 1 is a schematic view of a metal tube structure of example 1
FIG. 2 is a schematic sectional view of the metal rod of example 1 placed in a metal tube
FIG. 3 is a schematic view of the file of example 1 with the rasp body and the metal pipe connecting the rod portion removed
FIG. 4 is a schematic view of the file with thread according to example 1
FIG. 5 is a schematic view of an integrally formed handle according to embodiment 1
FIG. 6 is a schematic view of a rasp body for bidirectional processing in example 1
FIG. 7 is a schematic view showing that the sectional shape of the rasp body according to example 1 is changed from a triangle having a concave portion on the oblique side to a regular triangle gradually from the handle direction toward the tip direction
FIG. 8 is a schematic view showing a file in accordance with example 1, in which the sectional shape of the file gradually changes from a rectangular shape having a small aspect ratio to a rectangular shape having a large aspect ratio from the handle direction toward the tip direction
FIG. 9 is a schematic view showing that the cross-sectional shape of the rasp body according to example 1 is changed from a curved four-sided shape to a displaced semicircular shape gradually from the handle direction toward the tip direction
FIG. 10 is a schematic view showing that the cross-sectional shape of the rasp body according to example 1 is changed from a quadrangular prism shape gradually from the handle direction toward the tip direction
FIG. 11 is a cross-sectional view of the file of example 1 showing an alternative asymmetrical shape at the center
FIG. 12 is a cross-sectional view of the rasp body of example 1 in an alternative centrosymmetric form
FIG. 13 is a schematic view showing that the thread angle of the rasp body of example 1 is gradually increased from the handle direction toward the tip direction
FIG. 14 is a view showing that the angle of the thread of the rasp body of example 1 is gradually decreased from the handle direction toward the tip direction
FIG. 15 is a view showing the screw thread of the rasp body of example 1 having a small angle at the center and large ends
FIG. 16 is a schematic view showing the screw thread of the rasp body of example 1 having a large angle in the middle and small ends
FIG. 17 is a schematic view showing the setting of the twisted end in the bidirectional processing of the file in embodiment 2
FIG. 18 is a schematic view of embodiment 2 for setting again a twist end
FIG. 19 is a schematic view showing the progressive increase in the thread density of the rasp body according to example 2
FIG. 20 is a view showing the configuration in which the screw distribution of the file body of example 2 is formed in such a manner that the center part is closed and both ends are sparse
FIG. 21 is a schematic view showing the file of example 2 cut at the midpoint thereof
FIG. 22 is a schematic view of composite green body obtained by cutting in example 3
FIG. 23 is a schematic view of the file of embodiment 3 excluding the file body and the metal pipe for connecting the rod portion
FIG. 24 is a schematic view of embodiment 3 in which the handle is separately processed and then fixed to the connecting rod
FIG. 25 is a schematic view showing the file of example 3 cut at the midpoint thereof
FIG. 26 is a schematic view of embodiment 3 in which the handle is separately processed and then fixed to the connecting rod
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
Example 1:
the invention relates to a novel root canal file processing technology which mainly comprises two parts of manufacturing a composite embryo body and reducing material processing. The composite blank comprises a metal tube 1 and one or more than one metal rod 2, the metal rod 2 is synchronously drawn in the metal tube 1 and outside the metal tube 1, and the metal tube 1 is densely wrapped.
The method for manufacturing the composite blank comprises the following steps:
s1 as shown in fig. 1, a metal rod is processed into a metal tube 1 having a hollow structure at its center portion by a tool such as an electric discharge punch, a wire electric discharge machine, an electric discharge forming machine, etc.; the metal tube 1 can be made of nickel-titanium alloy, stainless steel, cobalt-chromium alloy, copper and the like; the metal rod 2 can be made of nickel-titanium alloy, stainless steel, cobalt-chromium alloy, copper and the like;
s2 as shown in fig. 2, the metal rod 2 is inserted into the hollow structure of the metal tube 1, and the sectional shape of the metal rod 2 is adapted to the sectional shape of the hollow structure;
s3, integrally drawing and annealing the complex of the metal tube 1 and the metal rod 2 for multiple times, wherein the annealing temperature is 600-900 ℃, and the preferred temperature is 700-800 ℃; after drawing, the metal tube 1 tightly wraps the metal rod 2 inside, so that a compact and stable connecting structure is formed between the metal tube 1 and the metal rod 2;
s4, the diameter of the composite body of the metal tube 1 and the metal rod 2 is reduced by cold drawing until the diameter is slightly larger than or equal to the diameter of the handle required by the root canal file, and a composite embryo body is formed; the cold drawing deformation is 20-50%, preferably 30-40%.
The step of reducing the material comprises the following steps:
t1 As shown in FIG. 3, the complex embryo body slightly longer than the length of the root canal file is cut out and then divided into three parts, namely a handle 3, a file 4 and a connecting rod 5; partially removing the metal tube 1 on the outer layer of the connecting rod 5 to ensure that the thickness of the metal tube 1 attached to the outside of the connecting rod 5 is 0.05-0.4 mm; removing the outer layer metal tube 1 of the file body 4 by grinding or a chemical method to expose the inner metal rod 2;
t2 As shown in FIG. 4, the metal rod 2 after the outer layer metal tube 1 is removed is made into a rasp body 4 with screw threads on the surface by grinding;
t3 as shown in fig. 5, the handle 3 is machined to the desired shape.
Specifically, the method comprises the following steps:
in step T2, when the file 4 is to be screwed, the upper and lower screwed ends 6 and 7 are fixed, respectively, and the upper and lower screwed ends 6 and 7 are rotated in opposite directions to screw the portion of the metal rod 2 between the upper and lower screwed ends 6 and 7 one or more times, as shown in FIG. 6. After each twist, the file is heat set to maintain the wound form. The heat setting temperature is 350-600 ℃, and the preferable temperature is 400-550 ℃.
In this embodiment, the cross-sectional shape of the rasp body 4 may be changed from the handle direction to the tip direction. As shown in fig. 7, the cross-sectional shape of the rasp body 4 gradually changes from a triangle with a concave on the hypotenuse to a regular triangle from the handle direction toward the tip direction. As shown in FIG. 8, the cross-sectional shape of the rasp body 4 is changed from a rectangular shape having a small aspect ratio to a rectangular shape having a large aspect ratio from the handle direction toward the tip direction. As shown in FIG. 9, the cross-sectional shape of the rasp body 4 is gradually changed from a curved four-sided shape to a displaced semicircular shape from the handle direction toward the tip direction. As shown in fig. 10, the cross-sectional shape of the rasp body 4 is gradually changed from a four-tooth edge shape to a rectangular shape from the handle direction toward the tip direction.
Thus, the cross-sectional shape of the file 4 may be the same from the handle direction to the tip direction, or may be a combination of various shapes. The cross-sectional shape may be selected from a centrally asymmetric shape as shown in fig. 11, and may also be selected from a centrally symmetric shape as shown in fig. 12.
In this embodiment, the size of the included angle between the inclined direction of the thread of the file body 4 and the radial direction of the file body can be changed from the direction of the handle to the direction of the tip. As shown in fig. 13, the angle of the thread gradually increases from the handle direction to the tip direction, for example, 30 ° in the direction close to the handle 3, 40 ° in the middle, and 50 ° at the tip. As shown in fig. 14, the angle of the thread decreases from the handle direction to the tip, for example, 50 ° in the direction close to the handle 3, 40 ° in the middle, and 30 ° at the tip. As shown in fig. 15, the angle of the thread is small in the middle and large at both ends, e.g. 40 ° towards the handle 3, 30 ° in the middle and 40 ° at the tip. As shown in fig. 16, the angle of the thread is large in the middle and small at the ends, e.g. 30 ° towards the handle 3, 40 ° in the middle and 30 ° at the tip.
Example 2:
the difference between this embodiment and embodiment 1 is that when the file 4 is machined by mechanical screwing, the material reducing machining process includes the following steps:
t1' As shown in FIG. 17, the compound embryo body with twice the length of the root canal file is cut, and then the two sides are symmetrically divided into three parts of a handle 3, a file body 4 and a connecting rod 5 by taking the middle point of the compound embryo body as the center, wherein the parts of the compound embryo body file body 4 at the two sides are connected at the middle point; removing the outer layer metal tube 1 of the file body 4 by grinding or a chemical method to expose the inner metal rod 2; partially removing the metal tube 1 on the outer layer of the connecting rod 5 to ensure that the thickness of the metal tube 1 attached to the outside of the connecting rod 5 is 0.05-0.4 mm;
t2' As shown in FIG. 18, the first and second screwing ends 8 and 9 are located at the middle of the files 4 on both sides with a small distance therebetween, and the distance between the first and second screwing ends 8 and 9 is 2-10mm in this embodiment; the first screwing end 8 and the second screwing end 9 are respectively fixed and rotate oppositely, and threads are screwed at the position of the file body 4;
t3' is subjected to heat treatment to shape the thread, wherein the temperature for heat treatment shape setting is 350-600 ℃, and the preferred temperature is 400-550 ℃;
t4' as shown in fig. 19, the third and fourth screwing tips 10 and 11 are fixed in the distal direction of the first and second screwing tips 8 and 9, and the third and fourth screwing tips 10 and 11 are rotated in the original rotation direction, so that the thread between the third and fourth screwing tips 10 and 11 appears and the thread density between the first and second screwing tips 8 and 9 increases; repeating the heat treatment of T3';
by analogy, T5' continuously increases the distance between the two screwing ends and continues screwing, and carries out heat treatment setting after screwing the thread each time, and finally obtains the shape that the thread distribution shows that the middle part is tight and the two ends are sparse as shown in figure 20;
t6' As shown in FIG. 21, the threaded file 4 is cut off from the midpoint, and the handles 3 of the two root canal files are cut off, so that two root canal files with the handles 3, the file 4 and the connecting rod 5 are formed.
Example 3:
the main difference between this embodiment and embodiment 1 is that the file is not integrally formed. Namely, in the process of material reducing processing:
t1' As shown in figure 22, the compound embryo body with a length slightly longer than the length of the file 4+ the connecting rod 5 is cut out, and then the compound vertebral body is divided into two parts of the file 4 and the connecting rod 5; partially removing the metal tube 1 on the outer layer of the connecting rod 5 to ensure that the thickness of the metal tube 1 attached to the outside of the connecting rod 5 is 0.05-0.4 mm; removing the outer layer metal tube 1 of the file body 4 by grinding or a chemical method to expose the inner metal rod 2;
t2 ″ As shown in FIG. 23, the metal rod 2 after the outer layer metal tube 1 is removed is made into a rasp body 4 with threads on the surface by grinding or mechanical screwing;
t3 ″ as shown in fig. 24, the handle 3 is separately processed, and the bar 5 is assembled with the handle 3.
In the step T3', the handle 3 and the connecting rod 5 can be assembled in an interference fit manner, that is, the size of the part of the file inserted into the hole at the bottom of the handle 3 is slightly larger than that of the hole; it is also possible to weld, that is, in step T1 ", a metal layer with good weldability is left outside the connecting rod 5, and then the upper part of the connecting rod 5 is inserted into the hole on the handle 3, and then the two are welded together at the joint.
Because the handle 3 and the connecting rod 5 are separately manufactured, when the file body 4 is processed in a screwing mode in the embodiment, the difference between the material reducing processing process and the embodiment 1 is as follows:
t1' cutting the compound blank with the length twice the length of the file 4+ the connecting rod 5; symmetrically dividing the two sides into a file 4 and a connecting rod 5 by taking the middle point of the composite embryo body as the center, wherein the file 4 parts of the composite embryo body on the two sides are connected at the middle point;
the T2 'T5' screwing process of the screw thread of the file body 4 is the same as the T2 'T5' in the embodiment 1;
t6' ″ shown in FIG. 25, the threaded file 4 is cut off from the midpoint to form two sets of connecting rods 5 and files 4;
t7 "' as shown in fig. 26, the handle 3 and the connecting rod 5 are assembled by the method of step T3".
It should be noted that the above-mentioned embodiments enable a person skilled in the art to more fully understand the invention, without restricting it in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
Claims (13)
1. A novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod;
s2, cold-drawing the composite blank;
material reduction processing:
t1 divides the composite embryo body into a connecting rod and a file body; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod;
t2, processing the file body into a cone with a thread on the outer surface by a grinding method;
t3 secures an otherwise machined handle to the connecting rod.
2. A novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod;
s2, cold-drawing the composite blank;
material reduction processing:
t1' cutting out the composite embryo body with length twice as long as the connecting rod and the file body; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod;
t2' takes the middle point of the compound embryo body as the center, symmetrically divides the two sides into a file body and a connecting rod, wherein the file body parts on the two sides are connected at the middle point;
t3' is provided with a first twisting end and a second twisting end at the approximate midpoint of the filing bodies on the two sides respectively, and the first twisting end and the second twisting end are fixed and rotate oppositely respectively to form threads between the first twisting end and the second twisting end;
t4' sets the screw thread;
t5 ' is respectively and symmetrically provided with a third screwing end and a fourth screwing end at the far middle positions of the first screwing end and the second screwing end of the files at two sides, and the steps T3 ' and T4 ' are repeated to finally obtain the state that the thread distribution of the files at two sides presents the state that the middle part is tight and the two ends are sparse;
t6' cuts off the files at the middle point;
t7' secures an otherwise machined handle to the connecting rod.
3. The novel root canal file processing technology according to claim 1 or 2, wherein: in the T3 or T7', the handle and the connecting rod are assembled in an interference fit mode, namely the part of the file body inserted into the bottom hole of the handle is slightly larger than the bottom hole in size; or welding, namely after the upper part of the connecting rod is plugged into the hole at the bottom of the handle, welding the connecting rod and the handle together at the connecting part.
4. A novel root canal file processing technology comprises the following steps:
manufacturing a composite blank:
s1, the composite blank body comprises a metal pipe and one or more than one metal rod, and the metal rod is placed in the metal pipe to be integrally drawn and annealed, so that the metal pipe forms a compact package outside the metal rod;
s2, performing cold drawing on the composite blank, wherein the cold drawing deformation is 20-50%;
material reduction processing:
t1' cutting out the compound embryo body with the length twice that of the root canal file; partially removing the metal tube on the outer layer of the connecting rod; removing the outer layer metal pipe of the file body by grinding or a chemical method to expose the inner metal rod;
t2' takes the middle point of the compound embryo body as the center, symmetrically divides the two sides into a handle, a file body and a connecting rod, wherein the file body parts on the two sides are connected at the middle point;
t3' sets the first twisting end and the second twisting end at the middle point of the file body at the two sides, and fixes the first twisting end and the second twisting end and rotates them oppositely, forms screw thread between the first twisting end and the second twisting end;
t4' for setting the screw thread;
t5 ' sets the third and fourth twisting ends symmetrically on the far middle position of the first and second twisting ends of the file body on both sides, repeats the steps T3 ' and T4 ', finally obtains the state that the screw distribution of the file body on both sides presents the tight middle and two sparse ends;
t6' cutting off the files at the middle point;
t7' shapes the handle.
5. The novel process of endodontic filing according to claim 1, 2 or 4, wherein: in the T1, T1' or T1 ", the metal tube thickness of the tie bar portion remaining is 0.05-0.4 mm.
6. The process of claim 1, 2 or 4, wherein: step S1 specifically includes:
s1.1, removing the central part of the metal rod to form a metal pipe with a hollow structure;
s1.2, placing the metal rod into a hollow structure of the metal pipe, wherein the cross section shape of the metal rod is adapted to that of the hollow structure;
s1.3, integrally drawing and annealing the composite of the metal pipe and the metal rod for one time or a plurality of times, wherein the annealing temperature is 600-900 ℃;
s1.4, performing cold drawing on the composite body of the metal pipe and the metal rod until the diameter of the composite body is slightly larger than or equal to the diameter of a handle required by a root canal file to form a composite embryo body; the cold drawing deformation is 20-50%, preferably 30-40%.
7. A root canal file produced using the process of claim 1 or 2 or 3, wherein: the metal pipe comprises a metal pipe and one or more metal rods, wherein the shape of the inner surface of the metal pipe is matched with the shape of the outer surface of each metal rod; the metal rod is arranged in the metal pipe, and the metal pipe forms a compact package outside the metal rod; the file body of the root canal file and the connecting rod are integrated, and the connecting rod is fixed with the handle; the metal pipe of the file body part is removed, and the metal rod inside is exposed outside; the metal rod of the file body part is a cone with a thread on the surface.
8. A root canal file produced using the process of claim 4 or 5, wherein: the metal pipe comprises a metal pipe and one or more metal rods, wherein the shape of the inner surface of the metal pipe is matched with the shape of the outer surface of each metal rod; the metal rod is arranged in the metal pipe, and the metal pipe forms a compact package outside the metal rod; the file body, the connecting rod and the handle of the root canal file are integrated, the metal pipe of the file body is removed, and the metal rod inside is exposed outside; the metal rod of the file body part is a cone with a thread on the surface.
9. The file according to claim 7 or 8, wherein: the metal tube of the outer layer of the connecting rod is partially removed, and the remaining thickness is 0.05-0.4 mm.
10. The file according to claim 7 or 8, wherein: the cross section of the file body is continuously changed from the handle direction to the tip direction.
11. The file according to claim 10, wherein: the cross section of the file body is gradually changed from the handle direction to the tip direction, and the cross section can be a triangle, a regular triangle, a rectangular curved side quadrangle, two staggered semicircles or a four-tooth arris shape with a concave bevel edge.
12. The file according to claim 7 or 8, wherein: the size of an included angle between the inclined direction of the thread of the file body and the radial direction of the file body is continuously changed from the direction of the handle to the direction of the tip.
13. The file according to claim 12, wherein: the contained angle is from handle direction toward most advanced direction grow gradually, or the contained angle reduces gradually toward most advanced direction from handle direction, or little, both ends are big in the middle of the contained angle, or big, both ends are little in the middle of the contained angle.
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| CN114010344A (en) * | 2021-12-13 | 2022-02-08 | 四川大学 | Machine that cobalt chromium alloy was made expands file |
| US11980521B1 (en) * | 2023-06-28 | 2024-05-14 | Michael J. Scianamblo | Endodontic instruments |
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