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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: 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 easily deformable.

5. Gradedthermodynamic alloy: This is a thermodynamic nickel titanium alloy that is more than 40 degrees Celsius higher than the temperature of the oral cavity. The archwire remains in this multi-component condition when placed in the dental cavity.

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 treatment system at the first stage.

2. Nitinol extension and push springs are used for 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 arch wire returns slowly to its original form when the tooth moves and when it does not is small.

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