Optimizing ageing conditions for commercial NiTi archwires: Insights from thermal phase transformation and tensile deformation analysis

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-30 DOI:10.15282/jmes.18.1.2024.4.0779

Asad Munir, M. F. Razali, A. Mahmud, Chinwei Ng, Sana Zulfiqar

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引用次数: 0

Abstract

Superelastic nickel-titanium (NiTi) archwires are now commonly used as the standard archwire during the orthodontic alignment and levelling stage. They are preferred due to their ability to apply minimal force on teeth while allowing for a wide range of tooth movements. During orthodontic treatment, the orthodontist assesses the dimension and shape of the NiTi archwire to determine the amount and direction of force required to align misaligned teeth. The main contribution of this study is the parametric analysis and establishment of a set of optimal ageing temperatures and duration for the investigation of functionally graded nickel-titanium archwire using differential scanning calorimetry (DSC) and tensile deformation testing. The mechanical and thermal phase transformation behavior after ageing at six temperatures for duration of 15 minutes have been investigated using tensile deformation test and differential scanning calorimetry (DSC) test in this paper. Experimental results reveal that in thermal analysis as the ageing temperatures increase from 400 °C to 490 °C, the austenite finish temperature rises to a value between 9.53 °C and 35.48 °C, and subsequently decreases to 520 °C. The archwire specimen aged for temperature of 490 °C exhibited the austenite finish temperature of around 35.48 °C, and it is highest among the aged wire specimens closest to oral temperature. In tensile deformation, the ideal ageing temperature for orthodontic applications was determined to be 490 °C for 15 minutes, resulting in relatively low plateau slope 13.73 GPa with high superelatic ratio 12.04, and maximum plateau strain of 7 %.

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优化商用镍钛弓丝的老化条件：热相变和拉伸变形分析的启示

超弹性镍钛（NiTi）弓丝现在通常被用作正畸排列和矫治阶段的标准弓丝。超弹性镍钛弓丝能够对牙齿施加最小的力，同时允许牙齿进行大范围的移动，因此备受青睐。在正畸治疗过程中，正畸医生会评估镍钛弓丝的尺寸和形状，以确定排齐错位牙齿所需的力的大小和方向。本研究的主要贡献在于利用差示扫描量热法（DSC）和拉伸变形测试对功能分级镍钛弓丝进行参数分析，并建立了一套最佳老化温度和持续时间。本文使用拉伸变形测试和差示扫描量热法（DSC）测试研究了在六种温度下持续 15 分钟老化后的机械和热相变行为。实验结果表明，在热分析中，随着老化温度从 400 ℃ 升高到 490 ℃，奥氏体终结温度上升到 9.53 ℃ 和 35.48 ℃ 之间，随后又下降到 520 ℃。温度为 490 °C 的弓丝试样的奥氏体最终温度约为 35.48 °C，是最接近口腔温度的老化试样中最高的。在拉伸变形中，正畸应用的理想老化温度被确定为 490 ° C，持续 15 分钟，产生相对较低的高原斜率 13.73 GPa 和较高的超静态比 12.04，最大高原应变为 7%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.