University Center for Dental Medicine UZB, Department of Paediatric Oral Health and Orthodontics, Mattenstrasse 40, 4058 Basel, Switzerland.
University Center for Dental Medicine UZB, Department of Paediatric Oral Health and Orthodontics, Mattenstrasse 40, 4058 Basel, Switzerland; University Hospital Basel, Department of Oral and Craniomaxillofacial Surgery, Basel, Switzerland.
Int Orthod. 2020 Sep;18(3):561-568. doi: 10.1016/j.ortho.2020.05.009. Epub 2020 Jun 18.
Due to their exceptional temperature sensitivity, the mechanical properties of Nickel-titanium and Copper Nickel-titanium wires may be influenced by their storage temperature. This in turn may have clinical implications and may also affect the outcomes. This study analyzed the influence of storage temperatures on the mechanical properties of orthodontic wires in a laboratory setting.
Stainless steel (SS), Nickel-Titanium (NiTi), and three variants of Copper-NiTi (Cu-NiTi 27°C, 35°C and 40°C), 0.017×0.025 inches in size were analysed using a three-point bending test in a pre-heated chamber at 36°C. The orthodontic wires were stored for twenty-four hours before the mechanical testing at four different temperatures (5°, 22°, 36° and 60°C).
The obtained results showed that the mechanical forces exerted by 27°C Copper-NiTi exhibit the most stable behaviour after having been stored at different temperatures, whereas 35°C Copper-NiTi showed the highest variability. As to be expected, Stainless steel shows no changes in its bending mechanical properties.
Furthermore, the results of this investigation reflect the importance of controlling the storage temperature of orthodontic NiTi and Copper-NiTi wires tested in a research environment in order to avoid unexpected bias.
由于镍钛和铜镍钛丝具有卓越的温度敏感性，其机械性能可能会受到储存温度的影响。这反过来可能会有临床意义，并可能影响结果。本研究在实验室环境中分析了储存温度对正畸丝机械性能的影响。
使用三点弯曲试验在 36°C 的预热室内分析尺寸为 0.017×0.025 英寸的不锈钢 (SS)、镍钛 (NiTi) 和三种铜镍钛变体 (Cu-NiTi 27°C、35°C 和 40°C)。在机械测试前，将正畸丝在四个不同温度（5°C、22°C、36°C 和 60°C）下储存 24 小时。
获得的结果表明，27°C 铜镍钛在不同温度下储存后表现出最稳定的机械力行为，而 35°C 铜镍钛表现出最高的可变性。正如预期的那样，不锈钢的弯曲机械性能没有变化。
此外，这项研究的结果反映了在研究环境中控制正畸镍钛和铜镍钛丝储存温度的重要性，以避免意外的偏差。
