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1. Corrosion resistance: Research shows that Niti wire is similar to stainless steel wire in corrosion resistance.
2. Mild orthodontic power: Currently, commercial orthodontic wire applications include austenitic stainless steel wire, cobalt-chromium-nickel wire, nickel-chromium wire, gold wire and titanium alloy wire. The load-displacement curves of these orthodontic wires under the conditions of tensile test and three-point bending test. This suggests that it provides a durable and mild corrective action.
3. Shape memory refers to the deformation of martensite at the temperature below Mf after the parent phase of a certain shape is cooled from Af to Mf. When heated to Af temperature, the material will automatically restore the shape of its parent phase and undergo an inverse phase transition. In fact, the shape memory effect is a thermally induced phase transition of Nitinol.
4. Toxicity resistance: Special chemical components of the nickel-titanium shape memory alloys, namely nickel-titanium and other atomic alloys, contain about 50% nickel and are known to cause cancer and promote cancer. In general, titanium ACTS act as a barrier layer on the surface, so Ni-TI alloys have good biocompatibility. TiXOy and TixNiOy of surface layer can suppressRelease of Ni.
5. Superelasticity refers to the phenomenon that the strain of the sample under the action of external forces is much larger than the elastic limit strain, which can be automatically recovered when unloading. In other words, in the parent phase state, stress-induced Martensitic phase transition occurs due to applied stress, so the alloy exhibits different mechanical properties from ordinary materials, and its elastic limit ratioGeneral materials are much larger and do not cease to obey Hooke's law. In contrast to shape memory properties, hyperelasticity involves no heat.
6. Good shock absorption: the greater the vibration caused by chewing and night grinding on the arch wire, the greater the damage to the root and periodontal tissue. Different attenuation experiments show that the vibration amplitude of the stainless steel wire is larger than that of the superelastic nickel titanium wire, and the initial vibration amplitude of the superelastic nickel titanium wire is only half of that of the stainless steel wire, with good performance Vibration and shock absorption characteristics. Arc protection is important for the health of teeth. Conventional arcs, such as stainless steel wires, tend to increase root absorption.
7. Sensitivity of intra-oral temperature change: The orthodontic capacity of stainless steel wire and CoCr alloy orthodontic wire is basically not affected by oral temperature. The orthodontic ability of high elastic Nitinol floss varies with the change of oral temperature. When the deformation is constant. The orthodontic ability increases with the increase of temperature. On the one hand, it speeds up the movement of the teeth,Because temperature changes in the mouth stimulate blood flow in areas of blood stasis due to capillary stagnation caused by orthodontic devices, repair cells receive adequate nutrients during this period. The teeth move to maintain their vitality and normal function. On the other hand, orthodontists cannot accurately control or measure the orthodontic energy in the oral environment Force.
