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Nitinol The shape memory alloy has many functional properties, including high strength, corrosion resistant, biocompatibility and non-toxicity. 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 after it has been deformed during the low temperature phase. Its expansion rate exceeds 20%, its fatigue life is 107 times greater, and it has better damping characteristics than regular metals.
Nitinol Wires Classification
1. In 1940 gold bowwire, cobalt chrome alloy wire and stainless round wire.

2. Martensite stabilized alloys were first produced in 1960. 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: Increased thermodynamic Nickel-Titanium Alloy: TTR is about 40degC higher than oral temperatures, so when the archwire of nickel-titanium in the oral cavity is still in multi-component, the archwire remains relatively soft.

Nitinol as a clinical application:
1. The first step in the treatment is to align and level the dentition of the patient. 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”, which means 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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