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What is Nitinol Memory alloy?
Nitinol is a shape memory alloy, which is a special alloy that can automatically restore its plastic deformation to its original shape at a certain temperature. Its expansion rate is over 20%, its fatigue life is up to 1*10 to the 7th power, its damping characteristics are 10 times higher than that of ordinary springs, and its corrosion resistance is better than the best medical stainless steel at present, so it can meet various engineering and It is an excellent functional material for medical application requirements. In addition to its unique shape memory function, memory alloy also has excellent characteristics such as wear resistance, corrosion resistance, high damping and super elasticity.
Clinical application of Nitinol Memory alloy
Nickel-titanium spring: nickel-titanium push spring and extension spring are springs used for orthodontics. They are super-elastic and suitable for orthodontic treatment to open up the gap between teeth and pull teeth in different directions. The nickel-titanium coil spring can generate a force of about 50g when extended by 1mm. Nickel-titanium coil springs have high elastic properties and can produce a softer and stable continuous force under tension. The attenuation of the force is very small, which can produce the ideal orthodontic force required for clinically moving teeth. Meet the physiological requirements. Nitinol wire tension spring has high elasticity and very low permanent deformation rate. Compared with stainless steel wire of the same diameter, the released corrective force is 3.5-4 times different. Therefore, in the application of orthodontic treatment, the patient not only has light pain, but also feels soft and lasting, and the follow-up time is reduced, shortening the course of treatment, and improving the curative effect. It is a new excellent mechanical device in orthodontic treatment.
It is used for the early alignment and leveling of the patient’s dentition. Due to the superelasticity and shape memory properties of the Nitinol archwire and the lower stress-strain curve, the Nitinol archwire is routinely clinically used as the initial arch in the orthodontic system. Silk, in this way, the patient’s discomfort will be greatly reduced. As there are several different straight wire arch correction techniques, the MBT technology recommends using 0.016 inch heat activated nickel titanium alloy arch wire (HANT wire), and the DEMON self-locking bracket technology recommends using copper-containing heat activated nickel titanium produced by Omcro. Alloy arch wire (phase transition temperature is about 40 degrees), O-PAK correction technology recommends using 0.016 inch super-elastic Nitinol arch wire for early alignment and leveling.
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