Differential scanning calorimetric studies of nickel titanium rotary endodontic instruments
Differential scanning calorimetric studies of nickel titanium rotary endodontic instruments
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DOI：
10.1097/00004770-200208000-00001
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发表时间：
2002-08-01
影响因子：
4.2
通讯作者：
Grentzer, TH
中科院分区：
文献类型：
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作者：
Brantley, WA;Svec, TA;Grentzer, TH
在 -130 度至 100 度之间对由镍钛 (NiTi) 旋转牙髓器械制备的标本进行差示扫描量热 (DSC) 分析：ProFile (n = 5)、Lightspeed (n = 4) 和 Quantec (n = 3)。 ProFile 和 Lightspeed 仪器处于收到状态，而 Quantec 仪器是从牙科诊所随机挑选的，历史未知。 DSC 图显示分析的 ProFile 和 Lightspeed 仪器具有超弹性 NiTi 特性，奥氏体精加工 (A(f)) 温度约为 25 摄氏度。 ProFile 仪器和起始线材毛坯 (n = 2) 的 DSC 图的差异归因于制造过程。当样品在-130℃至100℃之间加热和冷却时的相变行为、相变的温度范围以及由此产生的热函变化与之前报道的在口腔环境中具有超弹性特性或形状记忆行为的镍钛正畸金属丝相似。实验表明，DSC 是对这些旋转仪器进行材料表征的强大工具，可提供其他分析技术无法提供的有关 NiTi 相的直接信息，而 NiTi 相从根本上决定了其临床行为。
Differential scanning calorimetric (DSC) analyses were performed between -130degrees and 100 degreesC on specimens prepared from nickel-titanium (NiTi) rotary endodontic instruments: ProFile (n = 5), Lightspeed (n = 4), and Quantec (n = 3). The ProFile and Lightspeed instruments were in the as-received condition, whereas the Quantec instruments were randomly selected from a dental clinic and had unknown history. The DSC plots showed that the ProFile and Lightspeed instruments analyzed had the superelastic NiTi property, with an austenite-finish (A(f)) temperature of approximately 25 degreesC. Differences in DSC plots for the ProFile instruments and the starting wire blanks (n = 2) were attributed to the manufacturing process. The phase transformation behavior when the specimens were heated and cooled between -130degrees and 100 degreesC, the temperature ranges for the phase transformations, and the resulting enthalpy changes were similar to those previously reported for nickel-titanium orthodontic wires having superelastic characteristics or shape memory behavior in the oral environment. The experiments demonstrated that DSC is a powerful tool for materials characterization of these rotary instruments, providing direct information not readily available from other analytical techniques about the NiTi phases present, which are fundamentally responsible for their clinical behavior.