OBJECTIVE: The purpose of this study was to evaluate the force delivered by different superlastic nickel-titanium wires during vertical displacement, in order to determine whether their stress release meets the criteria for constant and light forces that are usually accredited to these archwires. METHOD: Ten samples of 6 brands of 0.016-in archwires (Ormco, GAC, Morelli, TP, American Orthodontics e Rocky Mountain) were tested in a complete metal model using Dynalock brackets (3M Unitek™). In the canine position, there was a sliding bracket connected to a pole. This set was related to a load cell of 0.5 kg attached to a universal testing machine (Autograph AG-199kNG, Shimadzu). The crosshead speed was 0.5 mm/min and the maximum displacement was 1.0 mm. The model was submerged in temperature-controlled water. The results were analyzed by ANOVA (p < 0.05), using the software SAS System 8.02, Cry, NC, USA. RESULTS: The TP archwire had the lowest force throughout the test, although the final force was high (277.91 g). The Rocky Mountain archwire had the highest force release (455.41 g). CONCLUSION: The different brands of wires tested in this study failed in delivering low and constant forces as expected from superlastic nickel-titanium wires. The forces were extremely heavy for a vertical tooth movement.
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机译：目的：本研究的目的是评估不同的超弹性镍钛丝在垂直位移过程中传递的力，以确定它们的应力释放是否满足这些弓丝通常所承受的恒定和轻力的标准。方法：使用Dynalock托槽（3M Unitek™）在完整的金属模型中测试了6个品牌的0.016英寸弓丝（Ormco，GAC，Morelli，TP，American Orthodontics e Rocky Mountain）的十个样品。在犬的位置，有一个滑杆连接到杆上。该套件与连接到通用测试机（Autograph AG-199kNG，Shimadzu）的0.5 kg称重传感器有关。十字头速度为0.5mm / min，最大位移为1.0mm。该模型浸没在温度受控的水中。使用软件SAS System 8.02（美国北卡罗来纳州，美国），通过ANOVA（p <0.05）分析结果。结果：尽管最终力很高（277.91 g），但TP弓丝在整个测试中的力最低。落基山弓丝的释放力最高（455.41 g）。结论：在这项研究中测试的不同品牌的电线未能提供超弹性镍钛电线所期望的低而恒定的力。垂直牙齿运动的力非常重。
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