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The features of nitinol

wallpapers News 2021-10-28
Nitinol is sensitive to temperature changes in the oral cavity. The orthodontic force of stainless steel wire and CoCr alloy tooth orthodontic wire is not affected by oral temperature. The orthodontic force of superelastic Nitinol orthodontic wire varies with the change of oral temperature.
As the temperature rises, the orthodontic force increases. On the one hand, it can accelerate the movement of teeth, because the temperature change in the mouth will stimulate the blood flow in the area of capillary stagnation caused by the appliance so that the repair cells in the process of tooth movement can be fully nourished, and maintain their vitality and normal function. Orthodontists, on the other hand, cannot accurately control or measure corrective forces in the oral environment.
Nitinol has corrosion resistance. Some studies show that the corrosion resistance of nickel-titanium wire is similar to that of stainless steel wire.
Nitinol is resistant to toxicity. The special chemical composition of nickel-titanium shape memory alloy is that it is a nickel-titanium atom alloy containing about 50% nickel, which is known to have carcinogenic and carcinogenic effects. In general, the surface layer of titanium oxidation acts as a barrier, making the Ni-Ti alloy have good biocompatibility.
Nitinol has gentle healing power. Currently, commercially available orthodontic wires include austenitic stainless steel wire, cobalt-chrome-nickel alloy wire, nickel-chromium alloy wire, Australian alloy wire, gold alloy wire, and ß titanium alloy wire. Load-displacement curves of these orthodontic wires under tensile test and three-point bending test conditions. The unloading curve platform of Nitinol is the lowest and the flattest, indicating that Nitinol can provide the most durable and gentle correction force.
Nitinol has good shock absorption characteristics. The more vibration caused by chewing and night grinding, the more damage to the root and periodontal tissue. Through different attenuation experiment results, the study found the arch-wire stainless steel wire vibration amplitude is larger than hyperelastic nickel-titanium silk, super-elastic nickel-titanium arch-wire the initial vibration amplitude is only half of the stainless steel wire, good vibration and shock absorption characteristics of the arch-wire is important for the health of the teeth, and traditional arch-wire such as stainless steel wire, tend to increase the root absorption.

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