CN102743233A - Ultra-fine grained nickel-titanium alloy root canal file and preparation method thereof - Google Patents
Ultra-fine grained nickel-titanium alloy root canal file and preparation method thereof Download PDFInfo
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- CN102743233A CN102743233A CN2012102571249A CN201210257124A CN102743233A CN 102743233 A CN102743233 A CN 102743233A CN 2012102571249 A CN2012102571249 A CN 2012102571249A CN 201210257124 A CN201210257124 A CN 201210257124A CN 102743233 A CN102743233 A CN 102743233A
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- nitinol
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C2201/00—Material properties
- A61C2201/007—Material properties using shape memory effect
Abstract
The invention discloses an ultra-fine grained nickel-titanium alloy root canal file and a preparation method thereof, relating to a root canal file and a preparation method thereof and aiming to solve the technical problems of low cutting efficiency and high probability of breakage in a curved root canal of the conventional nickel-titanium root canal file. The ultra-fine grained nickel-titanium alloy root canal file is prepared from ultra-fine grained nickel-titanium alloy with particle size of 200-300 nm. The preparation method comprises the following steps of: 1, performing ultra-fine graining treatment on the nickel-titanium alloy; 2, preparing an ultra-fine grained nickel-titanium alloy wire; 3, machining and performing surface treatment on a cutting edge of the root canal file; and 4, thermally treating the ultra-fine grained nickel-titanium alloy root canal file. The phase composition of the ultra-fine grained nickel-titanium root canal file consists of martensite and austenite at room temperature; the diffraction peak is obviously widened because of grain refinement, and the ultra-fine grained nickel-titanium root canal file is austenite at application temperature; the prepared ultra-fine grained nickel-titanium alloy root canal file has good hardness and wear resistance; and the cutting efficiency during clinical use is obviously improved.
Description
Technical field
The present invention relates to a kind of root canal file and preparation method thereof.
Background technology
Tooth section root canal file is to use one of the most frequent apparatus in the clinical oral, is mainly used in preparation, the shaping of tooth canal.Can it be divided into two kinds of rustless steel root canal file and NiTi root canal files according to the material of root canal file.Because the rustless steel rigidity is big, not flexible, the elastic deformation amount is little; In endodontic procedure, when especially crooked root tube prepares, usually make rustless steel root canal file generation plastic deformation; Accident in the initiation therapeutic process fractures or penetrates the tooth pulp cavity, brings very big misery to the patient.Comparatively speaking; The NiTi root canal file has advantages such as pliability is good, elasticity is big, and the root pipe skew that preparation causes during crooked root tube is less, and stronger to neutrality at tip of a root position; Aspect the preparation of crooked root tube remarkable advantages is being arranged, receiving oral cavity doctors' favor more and more.At present, all kinds of root canal preparation apparatuses that Nitinol is made are constantly gushed out, and to non-ISO apparatus, from the hand instrument to the machine, use apparatus from traditional I SO apparatus, become the main force of root canal appliance gradually.But research shows, compares with the rustless steel root canal file, and the stock-removing efficiency of NiTi root canal file is lower, and fluting, expansion, tip that cutting edge can take place in the clinical use are out of shape, become the wearing and tearing of forms such as circle, and wearability is relatively poor, causes stock-removing efficiency to descend.In addition, use the NiTi root canal file for machine, under high speed rotating load, fatigue fracture can take place in the NiTi root canal file after repeatedly using, and causes descend its service life.
Summary of the invention
The objective of the invention is provides a kind of ultra-fine brilliant Nitinol root canal file and preparation method thereof in order to solve the existing relatively poor technical problem of NiTi root canal file stock-removing efficiency.
Ultra-fine brilliant Nitinol root canal file is that the ultra-fine brilliant Nitinol of 200nm-300nm is processed by particle diameter.
The method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, ultra-fine brilliant processing of Nitinol: with the Ti atomic percentage conc is that to cut into diameter be that 20mm, length are the pole of 100mm for the Nitinol ingot casting of 48-52%; The method that adopts Equal Channel Angular Pressing then is respectively the mould of 90 ° and 120 ° through two passage angles with pole; The 400-500 ℃ of extruding of carrying out the 4-8 passage; Be incubated 30-60min down at 300-500 ℃ then, the Nitinol that obtains after ultra-fine crystalline substance is handled is excellent;
Two, the method for preparing of ultra-fine brilliant nitinol alloy wire: with the Nitinol rod after ultra-fine brilliant the processing is lubricant with the aquadag; In heating-up temperature is that 600-700 ℃, linear velocity are under the condition of 15-25m/s, draught per pass 0.04-0.01mm, and being prepared into diameter is the ultra-fine brilliant nitinol alloy wire of 0.4-2.5mm;
Three, ultra-fine brilliant nitinol alloy wire tapering preparation and root canal file cutting edge forming processes:
The ultra-fine brilliant nitinol alloy wire that step 2 is obtained is cut into the segment that length is 21-40mm; Then with length be an end of the ultra-fine brilliant nitinol alloy wire of 40mm process tapering be 0.02-0.10, long for 16-20mm, tip diameter be the tapering silk of 0.15-0.4mm; On the tapering silk, cut out cutting blade then, obtain ultra-fine brilliant Nitinol root canal file presoma;
Four, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min at 350-650 ℃, air cooling promptly gets ultra-fine brilliant Nitinol root canal file then, and ultra-fine brilliant Nitinol particle diameter is 200nm-300nm in the ultra-fine brilliant Nitinol root canal file of gained.
The method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, be that to be drawn into diameter be that 0.4-2.5mm, length are the silk material of 31mm for the Nitinol rod of 48-52% with the Ti atomic percentage conc;
Two, be that the silk material of 31mm immerses in 50 ± 5 ℃ the etchant solution with length; Processing length at the 35-65 ℃ of end with the silk material is that 16-20mm, tapering are 0.02-0.10; Tip diameter is the tapering silk of 0.15-0.4mm; Then the tapering silk is cut out cutting blade, obtain ultra-fine brilliant Nitinol root canal file presoma, etchant solution is by HF, HNO
3And H
2O forms, wherein HF, HNO
3With H
2The volume ratio of O is 1: 3: 6;
Three, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min down at 350-650 ℃, promptly gets ultra-fine brilliant Nitinol root canal file, ultra-fine brilliant Nitinol particle diameter is 200nm-300nm in the ultra-fine brilliant Nitinol root canal file of gained
Phase composition under the ultra-fine brilliant NiTi root canal file room temperature of the present invention is made up of martensite and austenite; And diffraction maximum is because grain refinement and obvious wideization; Be austenite under serviceability temperature, and the hardness and the wearability of the ultra-fine brilliant Nitinol root canal file of the present invention's preparation are better.
Description of drawings
Fig. 1 is the electron micrograph of the ultra-fine brilliant Nitinol root canal file of experiment one preparation;
Fig. 2 is the XRD photo of the ultra-fine brilliant Nitinol root canal file of experiment one preparation;
Fig. 3 is the DSC curve chart of the ultra-fine brilliant Nitinol root canal file of experiment one preparation;
Fig. 4 is the microhardness figure of Nitinol, ultra-fine brilliant Nitinol and the ultra-fine brilliant Nitinol behind 400 ℃ of heat treatments in the experiment one; The microhardness figure of 1 expression Nitinol among the figure; The microhardness figure of the ultra-fine brilliant Nitinol of 2 expressions, the microhardness figure of the ultra-fine brilliant Nitinol of 3 expressions behind 400 ℃ of heat treatments;
Fig. 5 is the rate of depreciation figure of Nitinol, ultra-fine brilliant Nitinol and the ultra-fine brilliant Nitinol behind 400 ℃ of heat treatments in the experiment one; A representes the rate of depreciation figure of Nitinol among the figure; B representes the rate of depreciation figure of ultra-fine brilliant Nitinol, and c representes the rate of depreciation figure of the ultra-fine brilliant Nitinol behind 400 ℃ of heat treatments;
Fig. 6 is Nitinol worn surface figure in the experiment one;
Fig. 7 is ultra-fine brilliant Nitinol worn surface figure in the experiment one;
Fig. 8 is the ultra-fine brilliant Nitinol worn surface figure behind 400 ℃ of heat treatments in the experiment one.
The specific embodiment
Technical scheme of the present invention is not limited to the following cited specific embodiment, also comprises the combination in any between each specific embodiment.
The specific embodiment one: ultra-fine brilliant Nitinol root canal file is that the ultra-fine brilliant Nitinol of 200nm-300nm is processed by particle diameter in this embodiment.
The specific embodiment two: this embodiment and the specific embodiment one are different be said ultra-fine brilliant Nitinol root canal file by particle diameter is that the ultra-fine brilliant Nitinol of 260nm is processed.Other is identical with the specific embodiment one.
The specific embodiment three: the method for preparing of ultra-fine brilliant Nitinol root canal file is following in this embodiment:
One, ultra-fine brilliant processing of Nitinol: with the Ti atomic percentage conc is that to cut into diameter be that 20mm, length are the pole of 100mm for the Nitinol ingot casting of 48-52%; The method that adopts Equal Channel Angular Pressing then is respectively the mould of 90 ° and 120 ° through two passage angles with pole; The 400-500 ℃ of extruding of carrying out the 4-8 passage; Be incubated 30-60min down at 300-500 ℃ then, the Nitinol that obtains after ultra-fine crystalline substance is handled is excellent;
Two, the method for preparing of ultra-fine brilliant nitinol alloy wire: with the Nitinol rod after ultra-fine brilliant the processing is lubricant with the aquadag; In heating-up temperature is that 600-700 ℃, linear velocity are under the condition of 15-25m/s, draught per pass 0.04-0.01mm, and being prepared into diameter is the ultra-fine brilliant nitinol alloy wire of 0.4-2.5mm;
Three, ultra-fine brilliant nitinol alloy wire tapering preparation and root canal file cutting edge forming processes:
The ultra-fine brilliant nitinol alloy wire that step 2 is obtained is cut into the segment that length is 21-40mm; Then with length be an end of the ultra-fine brilliant nitinol alloy wire of 40mm process tapering be 0.02-0.10, long for 16-20mm, tip diameter be the tapering silk of 0.15-0.4mm; On the tapering silk, cut out cutting blade then, obtain ultra-fine brilliant Nitinol root canal file presoma;
Four, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min at 350-650 ℃, air cooling promptly gets ultra-fine brilliant Nitinol root canal file then, and ultra-fine brilliant Nitinol particle diameter is 200nm-3OOnm in the ultra-fine brilliant Nitinol root canal file of gained.
The specific embodiment four: this embodiment and the specific embodiment three are different is that the Ti atomic percentage conc of the Nitinol ingot casting described in the step 1 is 50.8%.Other is identical with the specific embodiment three.
The specific embodiment five: what this embodiment and the specific embodiment three were different is 450 ℃ of extruding of carrying out 5 passages in the step 1.Other is identical with the specific embodiment three.
The specific embodiment six: this embodiment and the specific embodiment three are different is to be that an end of the ultra-fine brilliant nitinol alloy wire of 31mm processes tapering and is 0.04, longly is the tapering silk of 16mm with length in the step 3.Other is identical with the specific embodiment three.
The specific embodiment seven: this embodiment and the specific embodiment three are different is to be that an end of the ultra-fine brilliant nitinol alloy wire of 25mm processes tapering and is 0.06, longly is the tapering silk of 16mm with length in the step 3.Other is identical with the specific embodiment three.
The specific embodiment eight: this embodiment and the specific embodiment three are different is to be that an end of the ultra-fine brilliant nitinol alloy wire of 21mm processes tapering and is 0.08, longly is the tapering silk of 16mm with length in the step 3.Other is identical with the specific embodiment three.
The specific embodiment nine: this embodiment and the specific embodiment three are different is to be that an end of the ultra-fine brilliant nitinol alloy wire of 28mm processes tapering and is 0.10, longly is the tapering silk of 16mm with length in the step 3.Other is identical with the specific embodiment three.
The specific embodiment ten: the method for preparing of ultra-fine brilliant Nitinol root canal file is following in this embodiment:
One, be that to be drawn into diameter be that 0.4-2.5mm, length are the silk material of 31mm for the Nitinol rod of 48-52% with the Ti atomic percentage conc;
Two, be that the silk material of 31mm immerses in 50 ± 5 ℃ the etchant solution with length; Processing length at the 35-65 ℃ of end with the silk material is that 16-20mm, tapering are 0.02-0.10; Tip diameter is the tapering silk of 0.15-0.4mm; Then the tapering silk is cut out cutting blade, obtain ultra-fine brilliant Nitinol root canal file presoma, etchant solution is by HF, HNO
3And H
2O forms, wherein HF, HNO
3With H
2The volume ratio of O is 1: 3: 6;
Three, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min down at 350-650 ℃, promptly gets ultra-fine brilliant Nitinol root canal file, ultra-fine brilliant Nitinol particle diameter is 200nm-300nm in the ultra-fine brilliant Nitinol root canal file of gained.
On the tapering silk, adopt the method for centreless grinding to process cutting blade in this embodiment step 2; The ultra-fine brilliant root canal file precursor that processes cutting edge in this embodiment step 2 has carried out the surface electrochemistry polishing.
Adopt following experimental verification effect of the present invention:
Experiment one:
The method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, ultra-fine brilliant processing of Nitinol: with the Ti atomic percentage conc is that to cut into diameter be that 20mm, length are the pole of 100mm for 50.8% Nitinol ingot casting; Adopting the method for Equal Channel Angular Pressing then is respectively the mould of 90 degree and 120 degree through two passage angles with pole; 450 ℃ of extruding of carrying out 6 passages; Be incubated 50min down at 400 ℃ then, the Nitinol that obtains after ultra-fine crystalline substance is handled is excellent;
Two, the method for preparing of ultra-fine brilliant nitinol alloy wire: with the Nitinol rod after ultra-fine brilliant the processing is lubricant with the aquadag; In heating-up temperature is that 650 ℃, linear velocity are under the condition of 20m/s, draught per pass 0.02mm, and being prepared into diameter is the ultra-fine brilliant nitinol alloy wire of 0.52mm;
Three, ultra-fine brilliant nitinol alloy wire tapering preparation and root canal file cutting edge forming processes:
The ultra-fine brilliant nitinol alloy wire that step 2 is obtained is cut into the segment that length is 31mm; Then with length be an end of the ultra-fine brilliant nitinol alloy wire of 31mm process tapering be 0.02, long for 16mm, tip diameter be the tapering silk of 0.2mm; On the tapering silk, cut out cutting blade then, obtain ultra-fine brilliant Nitinol root canal file presoma;
Four, ultra-fine brilliant Nitinol root canal file presoma is incubated 60min at 400 ℃, air cooling promptly gets ultra-fine brilliant Nitinol root canal file then.
As can be seen from Figure 1 the matrix average grain size of NiTi root canal file is about 290nm.
As can be seen from Figure 2 the phase composition of ultra-fine brilliant NiTi root canal file is made up of martensite and austenite under the room temperature, and diffraction maximum is because grain refinement and obvious wideization.As can be seen from Figure 3 ultra-fine brilliant NiTi root canal file (Ti-50.8at.%Ni) is austenite under serviceability temperature.
Ultra-fine brilliant nitinol alloy wire in experiment one step 2 is ground and Al through SiC sand paper
2O
3After the powder polishing; On microhardness testers and ball-disc type friction wear testing machine, carry out hardness and wearability test respectively; In order to compare, the ultra-fine brilliant Nitinol behind conventional Nitinol and the 400 ℃ of insulation 60min heat treatments is carried out hardness and wearability test respectively on microhardness testers and ball-disc type friction wear testing machine.
Can know with conventional Nitinol by Fig. 4 and Fig. 5 and to compare that the hardness and the wearability of Nitinol after ultra-fine brilliant processing the and the ultra-fine brilliant Nitinol after 400 ℃ of insulation 60min heat treatment all increase.Behind 400 ℃ of insulation 60min heat treatments, form the precipitated phase that small and dispersed distributes in the Nitinol, thereby the hardness of ultra-fine brilliant Nitinol and further raising of wearability.
Can find out that from Fig. 6, Fig. 7 and Fig. 8 Nitinol and ultra-fine brilliant Nitinol are main with abrasive wear, visible tangible ditch dug with a plow on the wear surface along frictional direction; And the ultra-fine brilliant Nitinol behind the heat treatment is main with adhesive wear, the visible vestige of peeling off with plastic deformation on the wear surface.
Experiment two:
The method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, be that to be drawn into diameter be that 2.5mm, length are the silk material of 40mm for 50.8% Nitinol rod with the Ti atomic percentage conc;
Two, the silk material is immersed in the etchant solution; Processing length at 50 ℃ of ends with the silk material is that 16mm, tapering are 0.04, and tip diameter is the tapering silk of 0.2mm, then the tapering silk is cut out cutting blade; Obtain ultra-fine brilliant Nitinol root canal file presoma, etchant solution is by HF, HNO
3And H
2O forms, wherein HF, HNO
3With H
2The volume ratio of O is 1: 3: 6;
Three, ultra-fine brilliant Nitinol root canal file presoma is incubated 30min down at 500 ℃, promptly gets ultra-fine brilliant Nitinol root canal file.
Claims (10)
1. ultra-fine brilliant Nitinol root canal file is characterized in that ultra-fine brilliant Nitinol root canal file is that the ultra-fine brilliant Nitinol of 200nm-300nm is processed by particle diameter.
2. according to the said ultra-fine brilliant Nitinol root canal file of claim 1, it is characterized in that said ultra-fine brilliant Nitinol root canal file is that the ultra-fine brilliant Nitinol of 260nm is processed by particle diameter.
3. the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 1 is characterized in that the method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, ultra-fine brilliant processing of Nitinol: with the Ti atomic percentage conc is that to cut into diameter be that 20mm, length are the pole of 100mm for the Nitinol ingot casting of 48-52%; The method that adopts Equal Channel Angular Pressing then is respectively the mould of 90 ° and 120 ° through two passage angles with pole; The 400-500 ℃ of extruding of carrying out the 4-8 passage; Be incubated 30-60min down at 300-500 ℃ then, the Nitinol that obtains after ultra-fine crystalline substance is handled is excellent;
Two, the method for preparing of ultra-fine brilliant nitinol alloy wire: with the Nitinol rod after ultra-fine brilliant the processing is lubricant with the aquadag; In heating-up temperature is that 600-700 ℃, linear velocity are under the condition of 15-25m/s, draught per pass 0.04-0.01mm, and being prepared into diameter is the ultra-fine brilliant nitinol alloy wire of 0.4-2.5mm;
Three, ultra-fine brilliant nitinol alloy wire tapering preparation and root canal file cutting edge forming processes:
The ultra-fine brilliant nitinol alloy wire that step 2 is obtained is cut into the segment that length is 21-40mm; Then with length be an end of the ultra-fine brilliant nitinol alloy wire of 40mm process tapering be 0.02-0.10, long for 16-20mm, tip diameter be the tapering silk of 0.15-0.4mm; On the tapering silk, cut out cutting blade then, obtain ultra-fine brilliant Nitinol root canal file presoma;
Four, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min at 350-650 ℃, air cooling promptly gets ultra-fine brilliant Nitinol root canal file then, and ultra-fine brilliant Nitinol particle diameter is 200nm-300nm in the ultra-fine brilliant Nitinol root canal file of gained.
4. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, the Ti atomic percentage conc that it is characterized in that the Nitinol ingot casting described in the step 1 is 50.8%.
5. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, it is characterized in that in the step 1 450 ℃ of extruding of carrying out 5 passages.
6. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, it is characterized in that in the step 3 with length being that an end of the ultra-fine brilliant nitinol alloy wire of 31mm processes tapering and is 0.04, longly is the tapering silk of 16mm.
7. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, it is characterized in that in the step 3 with length being that an end of the ultra-fine brilliant nitinol alloy wire of 25mm processes tapering and is 0.06, longly is the tapering silk of 16mm.
8. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, it is characterized in that in the step 3 with length being that an end of the ultra-fine brilliant nitinol alloy wire of 21mm processes tapering and is 0.08, longly is the tapering silk of 16mm.
9. according to the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 3, it is characterized in that in the step 3 with length being that an end of the ultra-fine brilliant nitinol alloy wire of 28mm processes tapering and is 0.10, longly is the tapering silk of 16mm.
10. the method for preparing of the said ultra-fine brilliant Nitinol root canal file of claim 1 is characterized in that the method for preparing of ultra-fine brilliant Nitinol root canal file is following:
One, be that to be drawn into diameter be that 0.4-2.5mm, length are the silk material of 31mm for the Nitinol rod of 48-52% with the Ti atomic percentage conc;
Two, be that the silk material of 31mm immerses in 50 ± 5 ℃ the etchant solution with length; Processing length at the 35-65 ℃ of end with the silk material is that 16-20mm, tapering are 0.02-0.10; Tip diameter is the tapering silk of 0.15-0.4mm; Then the tapering silk is cut out cutting blade, obtain ultra-fine brilliant Nitinol root canal file presoma, etchant solution is by HF, HNO
3And H
2O forms, wherein HF, HNO
3With H
2The volume ratio of O is 1: 3: 6;
Three, ultra-fine brilliant Nitinol root canal file presoma is incubated 30-120min down at 350-650 ℃, promptly gets ultra-fine brilliant Nitinol root canal file, ultra-fine brilliant Nitinol particle diameter is 200nm-300nm in the ultra-fine brilliant Nitinol root canal file of gained.
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| CN2012102571249A CN102743233A (en) | 2012-07-24 | 2012-07-24 | Ultra-fine grained nickel-titanium alloy root canal file and preparation method thereof |
| PCT/CN2013/079738 WO2014015767A1 (en) | 2012-07-24 | 2013-07-19 | Ultra-fine grain nickel-titanium alloy root canal file and preparation method therefor |
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| CN2012102571249A CN102743233A (en) | 2012-07-24 | 2012-07-24 | Ultra-fine grained nickel-titanium alloy root canal file and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014015767A1 (en) * | 2012-07-24 | 2014-01-30 | 哈尔滨工程大学 | Ultra-fine grain nickel-titanium alloy root canal file and preparation method therefor |
| CN103572186A (en) * | 2013-10-14 | 2014-02-12 | 上海交通大学 | Method for preparing ultra-fine grain titanium-based composite material by adopting equant bending channel deformation |
| CN105105809A (en) * | 2015-06-26 | 2015-12-02 | 段书华 | Smart transportation device used for minimally invasive closure of patent ductus arteriosus |
| CN107242911A (en) * | 2017-05-09 | 2017-10-13 | 深圳市速航科技发展有限公司 | Flexible root canal file of a kind of Nitinol gradient and preparation method thereof |
| WO2017177477A1 (en) * | 2016-04-12 | 2017-10-19 | 深圳市速航科技发展有限公司 | Nickel-titanium alloy gradient flexible root canal file and manufacturing method therefor |
| CN108788644A (en) * | 2018-06-21 | 2018-11-13 | 深圳市葆丰医疗器械有限公司 | A kind of preparation method of the flexible root canal file of Nitinol |
| US10960448B1 (en) | 2020-01-09 | 2021-03-30 | Prince Mohammad Bin Fahd University | Process for equal channel angular pressing fine grain titanium round tube |
| CN113211198A (en) * | 2021-04-21 | 2021-08-06 | 桐乡市三精自动化科技有限公司 | Root canal file grinding machine |
| CN114617651A (en) * | 2021-12-16 | 2022-06-14 | 广东工业大学 | Nickel-titanium radial gradient root canal file and manufacturing method thereof based on 3D printing |
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| CN103572186A (en) * | 2013-10-14 | 2014-02-12 | 上海交通大学 | Method for preparing ultra-fine grain titanium-based composite material by adopting equant bending channel deformation |
| CN103572186B (en) * | 2013-10-14 | 2015-10-28 | 上海交通大学 | Equal-diameter bending passage deformation is adopted to prepare the method for ultra-fine grain titanium matrix composite |
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| US10960448B1 (en) | 2020-01-09 | 2021-03-30 | Prince Mohammad Bin Fahd University | Process for equal channel angular pressing fine grain titanium round tube |
| US11344937B2 (en) | 2020-01-09 | 2022-05-31 | Prince Mohammad Bin Fahd University | Method for producing high strength titanium pipe |
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| CN113211198B (en) * | 2021-04-21 | 2023-01-10 | 桐乡市三精自动化科技有限公司 | Root canal file grinding machine |
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