Tooth orthodontic wire based on 4D printing technology and preparation method thereof
Through 4D printing technology, the preparation of dental orthodontic silk is achieved by using laser selection melting and solid solution treatment, which solves the problem that traditional dental orthodontic silk cannot be restored after deformation, and achieves long life and low-cost correction of dental orthodontic silk. Reduces risk of gum trauma.
Patent Information
- Application Number
- CN202310677073.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-08
- Publication Date
- 2024-12-10
AI Technical Summary
Traditional orthodontic filaments cannot automatically recover after a plastic deformation, resulting in frequent replacement during correction, increasing costs and potentially irritating the gums to cause trauma such as redness and ulcers.
Using 4D printing technology, NiTi aerosolized spherical powder is printed through laser selection melting method, and water-cooled after solid solution treatment to prepare orthodontic silk that can automatically recover, reducing the frequency of replacement and trauma risk.
The long life, low cost, high accuracy and strong performance of orthodontic filaments are achieved, avoiding gum trauma and high costs in traditional methods.
Smart Images
Figure CN119098596A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of medical materials, and in particular relates to a tooth orthodontic wire based on 4D printing technology and a preparation method thereof. Background Art
[0002] As people's living standards continue to improve, people's pursuit of beauty has become increasingly prominent. Teeth, as an important part of the human body, are not only used for chewing, but also have a decorative effect on the face. Therefore, orthodontic technology is crucial, which is not only beneficial to oral health care, but also can improve a person's image and temperament.
[0003] At present, orthodontic wires are usually made of stainless steel, titanium alloy, nickel-chromium alloy, etc. However, this type of orthodontic wire based on traditional materials cannot automatically recover after a plastic deformation, so the orthodontic wire needs to be constantly replaced according to the correction effect during the correction period, which undoubtedly increases the cost. In addition, the deformed orthodontic wire will irritate the gums to make them red, swollen, and bleed, forming a series of traumas such as traumatic ulcers. Therefore, it is urgent to solve the problems of oral trauma caused by orthodontic wires and high costs. Summary of the invention
[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a dental orthodontic wire based on 4D printing technology and a preparation method thereof. The dental orthodontic wire prepared by this method can achieve the advantages of low cost, high efficiency, high precision, long service life, strong practicality, etc.
[0005] The present invention is achieved through the following technical solutions:
[0006] A method for preparing tooth orthodontic wire based on 4D printing technology, comprising the following steps:
[0007] Step 1, printing by laser selective melting method to obtain printed tooth orthodontic wire;
[0008] The laser selective melting method printing process uses NiTi atomized spherical powder with an equal molar ratio as raw material;
[0009] Step 2, subjecting the printed orthodontic wire to a solution treatment, and then water cooling, to obtain the orthodontic wire based on the 4D printing technology;
[0010] The treatment temperature of the solution treatment process is 800-1000° C., and the solution treatment time is 30-60 minutes.
[0011] In the above technical solution, the laser melting method printing process uses an equiatomic ratio of atomized spherical powder Ni 50 Ti 50 As a raw material, its particle size is 15 to 60 μm.
[0012] In the above technical scheme, in the step 1, the printing process of the laser selective melting method is: the substrate adopts cast NiTi alloy, the surface of the substrate is polished until there is no oxide, the oil and dirt on the surface are cleaned with an organic solvent, the surface is sandblasted using a sandblasting machine, and the NiTi aerosolized spherical powder is put into the printer hopper, the construction size is the predetermined orthodontic wire model size, the interlayer rotation angle is set to 65°~70° to release residual stress, and the laser walking offline programming is performed. Before printing, the printing chamber is evacuated, the oxygen content is less than 500ppm, the laser power is 125W~175W, the scanning speed is 750~1050mm / s, the scanning interval is 50μm, the layer thickness is 40μm, and argon atmosphere is used for protection. The printed tooth orthodontic wire of the predetermined size is printed and cooled with the chamber.
[0013] In the above technical solution, in step 1, the process of constructing an orthodontic wire model with a predetermined size is performed using Magics or MarcamAutofab software, which also includes layered slicing of the orthodontic wire model and adding supports.
[0014] In the above technical solution, in step 1, the surface of the substrate is grinded with an angle grinder until there is no oxide, and the oil and dirt on the surface are cleaned with acetone and alcohol respectively.
[0015] In the above technical solution, in step 1, the substrate is preheated to 140-170° C. during the printing process of the laser selective melting method.
[0016] In the above technical solution, in step 1, AM-400 laser 3D printing equipment produced by Renishaw is used to perform laser selective melting method printing.
[0017] In the above technical solution, in step 1, the diameter of the printed orthodontic wire is 0.7 to 1.0 mm.
[0018] In the above technical solution, in step 1, the laser selective melting method adopts the AM-400 laser 3D printing equipment produced by Renishaw for laser additive manufacturing, and constructs an orthodontic wire model with a diameter of 0.7 to 1.0 mm in the special software Magics or MarcamAutofab, and the interlayer rotation angle is set to 67° to release residual stress. The software automatically performs offline programming of the laser movement. Before printing, the substrate is preheated to 170°C, and the printing chamber is evacuated. The oxygen content is less than 200ppm, the laser power is 175W, the scanning speed is 1050mm / s, the scanning spacing is 50μm, the layer thickness is set to 40μm, and the protective gas is argon. After printing, the printed tooth orthodontic wire is cooled with the chamber until the substrate cools to room temperature.
[0019] In the above technical solution, in step 2, before the solution treatment, the printed orthodontic wire is vacuum packaged, and then solution treatment is performed at a temperature of 1000°C for 30 minutes, followed by water cooling to obtain the orthodontic wire based on 4D printing technology.
[0020] A tooth orthodontic wire based on 4D printing technology prepared by the preparation method described in the above technical solution.
[0021] The advantages and beneficial effects of the present invention are:
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] (1) Long life: Compared with traditional orthodontic wires, the orthodontic wire based on 4D printing in the present invention has superelasticity and can automatically recover after plastic deformation. This means that the orthodontic wire based on 4D printing does not need to be constantly replaced according to the correction effect, which increases its service life;
[0024] (2) Low cost: First, 4D printing can directly realize the preparation of complex-shaped orthodontic wires in one go, avoiding the subsequent complex mechanical processing processes such as drawing and cutting; second, the orthodontic wire based on 4D printing does not need to be constantly replaced according to the correction effect. Therefore, it reduces the cost of orthodontics;
[0025] (3) Strong practicality: The 4D-printed orthodontic wire can adjust its position according to the patient's tooth contour, avoiding a series of traumas such as gingival redness, swelling, bleeding, and ulcers caused by traditional orthodontic wires, greatly enhancing its performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a real picture of the orthodontic wire based on 4D printing prepared in Example 1 of the present invention.
[0027] Figure 2 It is a schematic diagram of the predetermined orthodontic wire model in Example 1 of the present invention.
[0028] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION
[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.
[0030] Embodiment 1
[0031] A method for preparing tooth orthodontic wire based on 4D printing technology, comprising the following steps:
[0032] Step 1, printing by laser selective melting method to obtain printed tooth orthodontic wire;
[0033] The substrate is made of cast NiTi alloy. The surface of the substrate is polished until there is no oxide. The oil and dirt on the surface are cleaned with an organic solvent. The surface is sandblasted with a sandblasting machine. NiTi atomized spherical powder is put into the printer silo. The laser selective melting method uses the AM-400 laser 3D printing equipment produced by Renishaw for laser additive manufacturing. An orthodontic wire model with a diameter of 0.7 mm is constructed in the dedicated software Magics or MarcamAutofab, and the orthodontic wire model is sliced. And add support structure; the interlayer rotation angle is set to 67° to release residual stress, the software automatically performs offline programming of laser movement, the printing chamber is evacuated before printing, the oxygen content is less than 200ppm, the laser power is 175W, the scanning speed is 1050mm / s, the scanning interval is 50μm, the layer thickness is set to 40μm, the protective gas is argon, and the powder feeding device and the powder spreading scraper are used to lay and flatten the thin layer of powder on the substrate. The laser beam selectively melts the metal powder on the powder bed according to the slice contour and then solidifies to form a layer of entity. Repeating this process, layer by layer, can form three-dimensional solid parts with complex structures. In addition, in order to reduce the residual stress generated during the preparation process, the substrate is preheated to 170°C. After printing, the printed dental orthodontic wire is cooled with the chamber for 2 hours. The NiTi aerosolized spherical powder is an aerosolized spherical powder Ni with an equiatomic ratio. 50 Ti 50 , and its particle size is 15 to 60 μm.
[0034] The powder needs to be preheated to remove moisture, vibrated and finely screened to improve fluidity. The substrate generally needs to be sandblasted to remove dirt on the surface of the substrate and form a uniform and fine concave and convex surface to enhance the uniformity of powder spreading and the adhesion between the substrate and the powder.
[0035] Step 2, subjecting the printed orthodontic wire to a solution treatment. Before the solution treatment, in order to prevent oxidation, the printed orthodontic wire is vacuum packaged, and then subjected to a solution treatment. The solution treatment temperature is 1000°C, and the temperature is kept for 30 minutes. After that, the wire is water-cooled. After water cooling, the vacuum tube is broken and taken out to obtain the orthodontic wire based on 4D printing technology.
[0036] Usually, the three-point bending test is performed on the orthodontic wire to test its force (gf) at deflections of 3.0, 2.0, 1.0 and 0.5 mm, and to determine its permanent deformation (mm). When it meets the requirements of practical application, the force at deflections of 3.0, 2.0, 1.0 and 0.5 mm is ≤1600, ≤1200, ≤1000 and ≤800 gf respectively, and the permanent deformation is ≤0.5 mm.
[0037] Therefore, the above tests were conducted on the printed orthodontic wire and the final product based on 4D printing technology, and the results are as follows:
[0038] The printed orthodontic wire was obtained by selective laser melting. The forces at deflections of 3.0, 2.0, 1.0 and 0.5 mm were 924.32, 719.51, 434.72 and 267.75 gf respectively, and the permanent deformation was 1.04 mm. That is, it exhibited partial superelasticity during deformation, but it was not enough for practical applications.
[0039] The final product, the orthodontic wire based on 4D printing technology, has a force of 1230.1, 760.1, 291.10 and 77.20 gf at deflections of 3.0, 2.0, 1.0 and 0.5 mm, respectively, and a permanent deformation of 0.05 mm. Obviously, the superelasticity of the orthodontic wire after solution treatment is improved, making the permanent deformation meet the practical application.
[0040] Embodiment 2
[0041] The final product was obtained by using the parameters in Example 1, except that vacuum packaging was not performed during the solution treatment. It failed when the deflection was 2.0 mm. Therefore, the orthodontic wire that was not vacuum packaged for protection was oxidized, the performance deteriorated, and failed prematurely, which was not satisfactory for practical application.
[0042] Embodiment 3
[0043] The final product was formed by the steps described in Example 1, except that the process parameters of laser power of 100 W, scanning speed of 600 mm / s, scanning spacing of 50 μm, and layer thickness of 40 μm were used for forming. The forces of the final product when the deflections were 3.0, 2.0, 1.0 and 0.5 mm were 843.95, 672.08, 416.16 and 263.87 gf respectively, and the permanent deformation was 1.25 mm. The permanent deformation was not satisfactory for practical application.
[0044] Embodiment 4
[0045] The final product was formed by the steps described in Example 1, except that the solution treatment was performed at a temperature of 750°C and a holding temperature of 30 minutes. The forces of the final product at deflections of 3.0, 2.0, 1.0 and 0.5 mm were 867.00, 696.66, 473.30 and 278.46 gf, respectively, and the permanent deformation was 0.7 mm. The permanent deformation was not satisfactory for practical applications.
[0046] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.
Claims
1. A method for preparing orthodontic wire based on 4D printing technology, characterized in that: The following steps are involved: Step 1, printing by laser selective melting method to obtain printed tooth orthodontic wire; The laser selective melting method printing process uses NiTi atomized spherical powder with an equal molar ratio as raw material; Step 2, subjecting the printed orthodontic wire to a solution treatment, and then water cooling, to obtain the orthodontic wire based on the 4D printing technology; The treatment temperature of the solution treatment process is 800-1000° C., and the solution treatment time is 30-60 minutes.
2. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: The laser melting method printing process uses an equiatomic ratio of gas atomized spherical powder Ni 50 Ti 50 As a raw material, its particle size is 15 to 60 μm.
3. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: In the step 1, the printing process of the laser selective melting method is as follows: the substrate adopts a cast NiTi alloy, the surface of the substrate is polished until there is no oxide, the oil and dirt on the surface are cleaned with an organic solvent, the surface is sandblasted using a sandblasting machine, and the NiTi aerosolized spherical powder is put into the printer hopper, the construction size is a predetermined orthodontic wire model size, the interlayer rotation angle is set to 65° to 70° to release residual stress, and the laser walking offline programming is performed. Before printing, the printing chamber is evacuated, the oxygen content is less than 500ppm, the laser power is 125W to 175W, the scanning speed is 750 to 1050mm / s, the scanning interval is 50μm, the layer thickness is 40μm, and argon atmosphere protection is used to print to obtain a printed tooth orthodontic wire of a predetermined size, which is cooled with the chamber.
4. The method for preparing orthodontic wire based on 4D printing technology according to claim 3, characterized in that: In step 1, the process of constructing an orthodontic wire model with a predetermined size is performed using Magics or MarcamAutofab software, which also includes layered slicing of the orthodontic wire model and adding supports.
5. The method for preparing orthodontic wire based on 4D printing technology according to claim 3, characterized in that: In the step 1, the surface of the substrate is grinded with an angle grinder until there is no oxide, and the oil and dirt on the surface are cleaned with acetone and alcohol respectively; preferably, the substrate is preheated to 140-170° C. before the printing process of the laser selective melting method.
6. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: In the step 1, AM-400 laser 3D printing equipment produced by Renishaw is used to perform laser selective melting printing.
7. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: In the step 1, the diameter of the printed orthodontic wire is 0.7 to 1.0 mm.
8. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: In the step 1, the laser selective melting method uses the AM-400 laser 3D printing equipment produced by Renishaw to perform laser additive manufacturing, and constructs an orthodontic wire model with a diameter of 0.7 to 1.0 mm in the dedicated software Magics or MarcamAutofab, the interlayer rotation angle is set to 67° to release residual stress, the software automatically performs offline programming of the laser movement, the substrate is preheated to 170°C before printing, and the printing chamber is evacuated, the oxygen content is less than 200ppm, the laser power is 175W, the scanning speed is 1050mm / s, the scanning spacing is 50μm, the layer thickness is set to 40μm, the protective gas is argon, and the printed tooth orthodontic wire obtained after printing is cooled with the chamber until the substrate is cooled to room temperature.
9. The method for preparing orthodontic wire based on 4D printing technology according to claim 1, characterized in that: In the step 2, before the solution treatment, the printed orthodontic wire is vacuum packaged, and then solution treatment is performed at a temperature of 1000° C. for 30 minutes, followed by water cooling to obtain the orthodontic wire based on 4D printing technology.
10. An orthodontic wire based on 4D printing technology prepared by the method for preparing an orthodontic wire based on 4D printing technology as claimed in any one of claims 1 to 9.