Transition temperature range of thermally activated nickel-titanium archwires
Transition temperature range of thermally activated nickel-titanium archwires
复制标题
热活化镍钛弓丝的转变温度范围
DOI：
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发表时间：
2014
影响因子：
2.7
通讯作者：
Denis Denis Jardim Villarinho
中科院分区：
文献类型：
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作者：
Tatiana Sobottka Spini;F. Valarelli;R. Cançado;K. D. de Freitas;Denis Denis Jardim Villarinho
目的热激活镍钛弓丝的超弹性和热弹性效应所产生的形状记忆效应是其主要特征，并与其相变温度范围（TTR）密切相关。本研究的目的是评价市售热激活镍钛弓丝的TTR。材料与方法采用差示扫描量热法（DSC）对7种不同牌号的0.019“x0.025”热活化镍钛弓丝在-100 ° C ~ 150°C的温度范围内以10°C/min的速度进行了测试。范围为20.39°C至45.42°C。三种品牌的NiTi弓丝呈现接近室温的Af，并且这样，不呈现在临床应用中期望的形状记忆和伪弹性的性质。结论热激活镍钛弓丝的TTR存在很大的变异性，制造商应提供每种镍钛弓丝的弹性参数，以实现最佳的临床性能。
Objectives The shape memory resulting from the superelasticity and thermoelastic effect is the main characteristic of thermally activated NiTi archwires and is closely related to the transition temperature range (TTR). The aim of this study was to evaluate the TTR of thermally activated NiTi archwires commercially available. Material and Methods Seven different brands of 0.019"x0.025" thermally activated nickel-titanium archwires were tested as received by differential scanning calorimetry (DSC) over the temperature range from -100°C to 150°C at 10°C/min. Results All thermally activated NiTi archwires analyzed presented stage transformation during thermal scanning with final austenitic temperature (Af) ranging from 20.39°C to 45.42°C. Three brands of NiTi archwires presented Af close to the room temperature and, this way, do not present properties of shape memory and pseudoelasticity that are desirable in clinical applications. Conclusions The thermally activated NiTi archwires present great variability in the TTR and the elastic parameters of each NiTi archwire should be provided by the manufacturers, to allow achievement of the best clinical performance possible.