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Nitinol wire classification Evans and Durning classification

Nitinol wire classification Evans and Durning classification

  • Categories:Industry News
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  • Time of issue:2020-02-25

Nitinol wire classification Evans and Durning classification

(Summary description)Hierarchical thermodynamics: increase the thermodynamic nickel-titanium alloy: TTR temperature is higher than oral temperature, about 40 degrees Celsius, so when the nickel-titanium arch wire is placed in the mouth, it is still in a multi-state, the arch wire is soft, and austenite transformation only occurs when the mouth contains heat The alarm will only be issued when water is present. Therefore, the orthodontic force is weak and can be used as the initial archwire for adult patients and periodontal patients. The copper-nickel-titanium wire produced by OMCRO and Japan's low-lag L-H nickel-titanium arch wire have this property.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-02-25
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Information

1) 1940 gold arch wire, cobalt-chromium alloy wire, stainless steel round wire

 

2) In 1960, martensitic stable alloys were mainly made of nickel-titanium alloys after martensitic deformation. This arch wire has low stiffness and can produce lighter orthodontic force. There is no martensitic transformation caused by stress or temperature, so there is no memory effect and superelasticity.

 

3) In 1980, the nickel-titanium alloy arch wires of China and Japan were austenitic activated alloys, austenite in any state, and there was no martensite state caused by temperature inside and outside the mouth. The martensitic state can only be caused by stress, it is super elastic, but it has no shape memory function. This arch wire has good elasticity and low stiffness, which can produce weak orthodontic force. The most important feature is that the force generated from the beginning to the final stage is constant, which is better in the treatment of early irregular teeth. The disadvantage is that it cannot be bent and welded at room temperature. If the company is used as the main archwire, it often causes unnecessary expansion or contraction of the arch, making it difficult to establish a well-arranged premolar and molar.

 

4) In 1990, martensite-activated nickel-titanium alloy: TTR is lower than or very close to the oral cavity temperature, and it is multivariate at room temperature and easily deformed. When placed in the mouth, the martensite caused by stress and room temperature is transformed into austenite at the same time, that is, there is a shape memory function and super elasticity. It is easy to deform at room temperature (about 25C) and below, but when it reaches a certain temperature (about 32C), it will return to the original preform, showing the characteristics of shape memory and super elasticity. Beijing Smart Technology Co., Ltd.'s smart brand and 3M's Nitinola brand are typical representative products. Due to this property, heat-activated nickel-titanium archwires can be easily shaped and placed in a stent. When activated by the temperature and heat of the receptors in the mouth, it can produce a shape-recovering force that provides the required strength for orthopedics. Because the heat-activated nickel-titanium orthodontic wire has the characteristics of "cold softening and heat-activated elasticity", patients can change the orthodontic force through the hot and cold water in the mouth under the guidance of a doctor, which is more convenient. And reduce the discomfort of the initial orthodontic treatment.

 

5) Hierarchical thermodynamics: increase the thermodynamic nickel-titanium alloy: TTR temperature is higher than the oral temperature, about 40 degrees Celsius, so when the nickel-titanium arch wire is placed in the mouth, it is still in a multi-state, the arch wire is soft, and the austenite transformation is only when The alarm will only sound when hot water is contained. Therefore, the orthodontic force is weak and can be used as the initial archwire for adult patients and periodontal patients. OMCRO's copper-nickel-titanium wire and Japan's low-lag L-H nickel-titanium arch wire have this property.

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