Shape memory characteristics: shape memory refers to that when martensite is formed after the parent phase of a certain shape is cooled from above AF temperature to below MF temperature, the martensite is deformed below MF temperature and heated to below AF temperature, accompanied by reverse phase transformation, the material will automatically recover its shape in the parent phase.
Hyperelasticity: the so-called hyperelasticity refers to the phenomenon that the strain of the sample under the action of external force is far greater than its elastic limit strain variable, and the strain can be automatically recovered when unloading.
Sensitivity to temperature changes in the oral cavity: the orthodontic power of stainless steel wire and CoCr alloy dental orthodontic wire is basically not affected by the temperature in the oral cavity.
Corrosion resistance: some studies show that the corrosion resistance of nickel-titanium wire is similar to that of stainless steel wire.
Anti-toxicity: The special chemical composition of Ni-Ti shape memory alloy means that it is an atomic alloy of Ni-Ti and contains about 50% nickel, which is known to have carcinogenic and cancer-promoting effects.
Soft healing power: currently commercially available orthodontic wires include austenitic stainless steel wires, cobalt-chromium-nickel wires, nickel-chromium wires, Australian wires, gold wires and nickel-titanium wires.
Good shock absorption: the greater the vibration caused by mastication and night bruxism to the arch wire, the greater the damage to the root and periodontal tissues.
