5 Classifications Of Nitinol Shape Memory Alloy Wire

The following are the 5 classifications of nitinol shape memory alloy wires:

1. 1990, martensite-activated nickel-titanium alloys: that is, TTR is below the oral temperature or very similar to the oral temperature, exists in a pluralistic state at room temperature, is easy to deform, and when placed in the oral cavity, the martensite caused by stress and room temperature is transformed to austenite at the same time, i.e. there is a shape memory function and superelasticity. At room temperature (around 25 degrees) and below, it is easy to deform, but when it reaches a certain temperature (around 32 degrees) or above, it will return to its original preformed shape, showing the shape memory and super-elastic properties. Ltd. and 3M's Nitinol HA brand are typical products. Because of this property, thermally activated Nitinol wires can be easily manipulated and placed into brackets at room temperature or below, and when activated by body heat in the oral cavity, they can produce shape recovery and provide the necessary strength for orthopedic treatment. The heat-activated NiTi orthodontic wire is "softened by cold and made elastic by heat", allowing the patient to use hot and cold water in the mouth to change the orthodontic force under the guidance of the doctor, making it easier for the orthodontist and reducing initial orthodontic discomfort.

2. Graded thermodynamic: increased thermodynamic NiTi: the TTR temperature is raised above the oral temperature, roughly 40 degrees, so that when the NiTi archwire is placed in the mouth, it remains in a pluralistic state, the archwire is softer and the austenitic phase change only occurs when hot water is held in the mouth. As a result, the orthodontic force is weaker and it can be used as an initial archwire for adult patients and periodontists, as is the case with the copper-containing NiTi wire produced by Omcro and the Japanese low-lag L-H NiTi archwire.

3. 1940, gold archwire, cobalt-chromium alloy wire, and stainless steel round wire.

4. 1960, martensitic stabilized alloys: mostly made from nickel-titanium memory alloy wire deformed in the martensitic state. This type of wire has low stiffness and produces lighter orthodontic forces. There is no martensitic phase transformation caused by stress or temperature, and therefore no memory effect or superelasticity is present.

5. 1980, Chinese Nitinol and Japanese Nitinol wires, which are austenitic activated alloys: i.e. austenitic in all states, placed in and out of the mouth without a temperature-induced martensitic state, which can only be induced by stress, with superelasticity, but without shape memory function. This type of archwire has excellent resilience and low stiffness and can produce weak orthodontic forces. The major feature is that the force produced is constant from the initial start to the final stage and is more effective in the treatment of early malocclusion. The going point is that it cannot be bent into shape at room temperature and is not easily welded. If the company is used as the main archwire, it can often cause undesired expansion or reduction of the arch, and it is difficult to establish good alignment of the premolar and molar teeth.