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Nitinol The shape memory alloy has many functional properties, such as high strength, excellent corrosion resistance, non-toxicity, and good biocompatibility. It is also a promising material for medical applications. Nitinol’s shape memory alloy can only be reshaped by adding temperature between 20 and 300 degrees Celsius after it has been deformed during the low temperature phase. Its expansion is greater than 20%. The fatigue life can be up to 100 times longer. And the damping characteristics of the alloy are superior.
Nitinol Wires Classification
1. In 1940 gold bowwire, cobalt chrome alloy wire, and stainless steel wire.

2. Martensite stabilized alloys: Most nickel-titanium was made in 1960 after deformation to the martensite state. This arch wire has a low rigidity, and it can provide a lower correction force.

3. In 1980, Japanese nickel-titanium and Chinese nickel titanium alloy arch wires showed austenite states in all conditions.

4. Martensite activated alloy of nickel-titanium was developed in 1990. TTR is below the oral cavity or very close, it exists at room temperatures as a multi-element, and the material is easy to form.

5. Gradedthermodynamics (GTD): Increased thermodynamic Nickel-Titanium Alloy: TTR temperature is greater than the oral temperature of about 40degC. Therefore, when the nickel titanium archwire in the dental cavity is still in multi-component, the archwire remains relatively soft.

Nitinol as a clinical application:
1. It is used to align and level the dentition of patients as early as possible. Nitinol wires, with their superelasticity and shape-memory properties and lower stress/strain curves, are included as part of the initial stages in treatment systems.

2. Nitinol extension and push springs are used in orthodontics. These springs have a high degree of elasticity and are ideal for orthodontic treatment.

3. Dr. Soma in Japan and his team have developed and researched the LH Arch Wire. “LH” comes from “Low Hyperstratesis”, meaning that when the archwire is ligated on the bracket it produces when the archwire is activated. The difference in stress between when the archwire returns slowly to its original form when the tooth moves and when it does not is small.

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