Clinical application of NiTinol wires
志联
2024-02-25
Clinical application of NiTinol wires
1. Early Archwire Alignment: Due to the superelasticity and shape memory effect of NiTinol wires, as well as their low stress-strain curve, NiTinol wires are often used as initial archwires in orthodontic systems, reducing patient discomfort. Due to several different straight-wire techniques, the MBT technique recommends using 0.016-inch heat-activated NiTinol wire (HANT wire), the DEMON self-ligating bracket technique recommends using copper-containing heat-activated NiTinol wire (transformation temperature approximately 40 degrees), and the O-PAK technique suggests using 0.016-inch superelastic NiTinol wire for early alignment. Level measurement.
2. NiTi Springs: NiTi push springs and pull springs are springs used in orthodontics. Characterized by NiTinol-titanium superelasticity, they are suitable for opening interdental spaces and tooth extraction in different directions. A NiTinol-titanium spiral spring with an elongation of 1 mm can generate approximately 50 grams of force. NiTinol-titanium spiral springs have high elastic properties and can generate a relatively soft, stable, and lasting force under tension. The force attenuation is minimal, providing ideal orthodontic force for clinical tooth movement, meeting physiological requirements. Compared with stainless steel wires of the same diameter, NiTinol-titanium wire springs have high elasticity and a very low permanent deformation rate, releasing corrective force 3.5-4 times smaller than stainless steel wires of the same diameter. Therefore, in orthodontic treatment applications, patients not only experience less pain and feel a soft and lasting force, but also reduce the number of follow-up visits, shorten the treatment process, and improve treatment efficacy. It is a new type of excellent orthodontic treatment mechanical device.
3. L-H archwires were developed by Soma Corporation of Japan and manufactured by Tommy Corporation. "lh" is referred to as "low hysteresis." That is, when the archwire is bound to the bracket, the difference between the stress generated when the archwire is activated and the stress when the archwire slowly returns to its initial state is very small. In other words, the hysteresis is very small. Soma et al. compared the stress-strain curves of lh archwires with other NiTinol wires. The L-H archwire had the smallest hysteresis range. This characteristic gives the archwire the advantages of low load and light force. At the same time, the initial slope of the curve is lower, indicating that the archwire has lower stiffness. The hysteresis curves of other types of NiTinol archwires show that they have greater stiffness. Clearly, the reason for the L-H archwire is that the proportion of titanium in the left-handed NiTinol-titanium component is higher than that in ordinary NiTinol-titanium archwires, referred to as titanium-NiTinol archwires, and its shock absorption effect has been experimentally proven. Another characteristic of left-handed NiTinol-titanium wire is that it can be bent and heat-treated with heat-treating instruments. Therefore, left-handed NiTinol-titanium wire can also complete treatment, from alignment, opening occlusion, to closing gaps, and finally the finishing stage. As long as the archwire is removed from the required shape at each stage, it can be shaped with a heat-treating instrument and its hardness strengthened. Currently, L-H archwires are clinically used to expand arches and correct mandibular opening, deviation, and resistance. Due to their continuous stability and soft strength, the effect is better. At the same time, J-shaped hooks are often used to improve the weak points of the archwire. Although MEAW technology has ideal effects in correcting malocclusion, the complex archwire bending often makes many doctors hesitant. Therefore, some doctors use rocking-chair NiTinol-titanium archwires with a mechanical system similar to vertical traction of anterior teeth. Although this has a similar effect, they always feel that the independent tooth movement is not as good as the molar technique compared to molars, because the rocking-chair NiTinol-titanium archwire is a continuous archwire and cannot be bent. Therefore, the angle of bracket connection and the curvature of the rocking chair determine the angle of each tooth, unlike the traditional MEAW technology, where each tooth has a more independent adjustment space. Using left-handed NiTinol-titanium bending rocking chair, and then using an archwire forming machine to bend it in the mouth, the effect is quite ideal.
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