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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Fatigue of orthodontic nickel-titanium (NiTi) wires in different fluids under constant mechanical stress
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Fatigue of orthodontic nickel-titanium (NiTi) wires in different fluids under constant mechanical stress

机译：恒定机械应力下不同流体中正畸镍钛（NiTi）线的疲劳

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摘要

The aim of this study was to analyze in vitro the fatigue resistance of nickel-titanium (NiTi) and CuNiTi orthodontic wires when subjected to forces and fluids which are present intraorally. The wires were subjected to dynamic mechanical analysis (DMA) while they were immersed into different fluids with mechanical loading parameters similar to those that are subjected in the mouth. The characteristic temperatures of transitions and a rough surface structure on the perimeter of the wires were determined by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), respectively, before and after the DMA experiments. Stainless steel wires were used for comparison. In general, NiTi wires fractured earlier than the stainless steel specimens. Survival times were lower for the NiTi wires when immersed in fluids (water, citric acid, NaCl solution, artificial saliva, and fluoridated artificial saliva) than in air. SEM surface analysis showed that the NiTi and CuNiTi wires had a rougher surface than steel wires. The fracture occurred within a short number of loading cycles. Until fracture occurred, the mechanical properties remained mostly constant.
机译：这项研究的目的是体外分析镍钛合金（NiTi）和CuNiTi正畸线在口腔内受力和流体作用下的疲劳强度。将线浸入具有与口中相似的机械负荷参数的不同流体时，要对其进行动态机械分析（DMA）。在DMA实验之前和之后，分别通过差示扫描量热法（DSC）和扫描电子显微镜（SEM）来确定导线周围的转变特征温度和粗糙的表面结构。使用不锈钢丝进行比较。通常，NiTi钢丝比不锈钢试样断裂的时间要早​​。当浸入液体（水，柠檬酸，NaCl溶液，人工唾液和氟化人工唾液）中时，镍钛丝的存活时间比在空气中短。 SEM表面分析表明，NiTi和CuNiTi丝的表面比钢丝粗。断裂发生在短时间内的加载周期内。直到断裂发生，机械性能基本保持恒定。

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