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Nitinol Shape memory alloys are special alloys that have good plasticity and can restore their original shape automatically at a given temperature.
Nitinol alloy is a form memory alloy. It is a unique alloy that is capable of restoring its original shape when heated to a certain degree. Its expansion rate exceeds 20%, its damping characteristics are ten times greater than those of ordinary springs and it has a corrosion resistance that is superior to the best medical stainless-steel at the moment. It is one of the best functional materials.

The memory alloy is not only unique for its shape memory, but it also offers excellent wear resistance and corrosion resistance. It has high damping properties, too.

Nitinol Powder Special Properties

1. Shape memory properties (shape-memory) Shape memory is formed when the parent of a shape is cooled to a temperature lower than Mf. This martensite phase is then deformed and heated back to Af. When the material undergoes a reverse phase shift, it will automatically return to the original parent phase. The Nitinol phase change process that causes the shape memory is thermally induced.

2. Superelasticity When a force is applied to the sample, it can cause a strain greater than the elastic limit strain. The strain will automatically return when the external force is removed. In comparison with shape memory, superelasticity does not involve thermal energy. Superelasticity, in a nutshell, means that stress doesn’t increase as strain increases if you stay within a specific deformation range. The superelasticity can be classified into linear and nonlinear. Nonlinear superelasticity is the resultant of stress-induced martensitic phase transformations and their reverse phase transformations during loading and releasing in a temperature range above Af. The nonlinear pseudoelasticity is called phase-transformation pseudoelasticity. Nitinol’s phase-change pseudoelasticity can be as high as 8%.

3. Sensitivity of orthodontic wires to temperature changes: The orthodontic power and CoCr alloy orthopaedic wire is not affected by temperature changes. The temperature in the oral cavity affects the corrective force of super-elastic Nickel-Titanium alloy orthodontic wire. When the amount deformation is constant. Corrective force increases with temperature. On one hand, the temperature can increase the speed of tooth movement. The temperature changes within the oral cavity will cause the blood to flow more freely, thereby nourishing the repair cells during tooth movement. Maintain vitality and normal functions. Orthodontists are unable to precisely control and measure the orthodontic forces in the oral environment.

4. The corrosion resistance of Nickel-Titanium Wire is comparable to stainless steel wire.

5. Anti-toxicity: Nitinol, the shape memory metal, has a chemical composition that is unique. It contains about 50% nickel and is a known carcinogen and cancer promoter. In normal circumstances, titanium oxide on the surface acts as barrier. This makes Ni-Ti alloys biocompatible. TiXOy, TixNiOy, and TixNiOy are surface layers that can inhibit Ni release.

6. Gentle orthodontic power: currently commercially used orthopedic wires include austenitic stainless steel wires, cobalt-chromium-nickel alloy wires, nickel-chromium alloy wires, Australian alloy wires, gold alloy wires and ss-titanium alloy wires. These orthodontic wires have been tested in tensile and three-point bend tests. Nitinol’s unloading platform is the lowest, flattest and thus can deliver the most durable and gentle correction force.

7. Good shock-absorption properties: The more the archwire is vibrated by the night molars, the greater will be the damage caused to the periodontal tissue and the roots. Results of various arch wire attenuation studies show that stainless steel wire has a larger vibration amplitude than super-elastic nickel-ti wire. The initial vibratory amplitude for super-elastic NiTi wire is less than half of that of a stainless steel arch wire. The health of your teeth is important. Traditional archwires, like stainless steel wires can increase root resorption.

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