Nitinol Shape Memory Alloy Classification and Application

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Nitinol The shape memory alloy has many functional properties, including high strength, good corrosion resistance, 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 reaches 107 times 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 easily deformed.

5. Gradedthermodynamics (GTD): Increased thermodynamic Nickel-Titanium Alloy: TTR temperature is greater than the oral temperature of about 40degC. Therefore, when the archwire made from nickel-titanium enters the oral cavity it is still a multicomponent alloy and is 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: These springs are used for orthodontics. They are elastic and ideal for orthodontic treatment.

3. The LH Arch Wire was developed and researched by Dr. Soma in Japan. “LH” comes from “Low Hyperstratesis”, i.e., the archwire is activated when it is ligated. 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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