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使用机械拉伸试验对不同奥氏体活性镍钛正畸弓丝的超弹性进行比较和排序，并将其与电阻率相关联。

Comparison and ranking of superelasticity of different austenite active nickel-titanium orthodontic archwires using mechanical tensile testing and correlating with its electrical resistivity.

作者信息

Nagarajan D, Baskaranarayanan Balashanmugam, Usha K, Jayanthi M S, Vijjaykanth M

机构信息

Department of Orthodontics, Tamil Nadu Government Dental College and Hospital, Chennai, Tamil Nadu, India.

出版信息

J Pharm Bioallied Sci. 2016 Oct;8(Suppl 1):S71-S76. doi: 10.4103/0975-7406.191972.

DOI:10.4103/0975-7406.191972
PMID:27829751
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5074045/
Abstract

INTRODUCTION

The application of light and continuous forces for optimum physiological response and the least damage to the tooth supporting structures should be the primary aim of an orthodontist. Nickel-titanium (NiTi) alloys with their desirable properties are one of the natural choices of the clinicians.

AIM

This study was aimed to compare and rank them based on its tensile strength and electrical resistivity.

MATERIALS AND METHODS

The sample consisted of eight groups of 0.017 inch × 0.025 inch rectangular archwires from eight different manufacturers, and five samples from each group for tensile testing and nine samples for electrical resistivity tests were used. Data for stress at 10% strain and the initial slope were statistically analyzed with an analysis of variance and Scheffe tests with < 0.05. The stress/strain plots of each product were ranked for superelastic behavior. The rankings of the wires tested were based primarily on the unloading curve's slope which is indicative of the magnitude of the deactivation force and secondarily on the length of the horizontal segment which is indicative of continuous forces during deactivation. For calculating the electric resistivity, the change in resistance after inducing strain in the wires was taken into account for the calculation of degree of martensite transformation and for ranking.

RESULTS

In tensile testing Ortho Organizers wires ranked first and GAC Lowland NiTi wires ranked last. For resistivity tests Ormco A wires were found superior and Morelli remained last.

CONCLUSION

these rankings should be correlated clinically and need further studies.

摘要

引言

施加轻柔且持续的力以实现最佳生理反应并对牙齿支持结构造成最小损害，应是正畸医生的首要目标。具有理想性能的镍钛（NiTi）合金是临床医生的自然选择之一。

目的

本研究旨在根据其拉伸强度和电阻率对它们进行比较和排名。

材料与方法

样本由来自八个不同制造商的八组0.017英寸×0.025英寸的矩形弓丝组成，每组使用五个样本进行拉伸测试，九个样本进行电阻率测试。对10%应变时的应力和初始斜率数据进行方差分析和Scheffe检验，显著性水平<0.05。对每种产品的应力/应变图进行超弹性行为排名。所测试弓丝的排名主要基于卸载曲线的斜率，该斜率表示去激活力的大小，其次基于水平段的长度，该长度表示去激活过程中的持续力。为了计算电阻率，考虑了在弓丝中产生应变后电阻的变化，用于计算马氏体转变程度和排名。

结果

在拉伸测试中，Ortho Organizers弓丝排名第一，GAC Lowland NiTi弓丝排名最后。在电阻率测试中，发现Ormco A弓丝更优，Morelli弓丝仍排名最后。

结论

这些排名应与临床情况相关联，并且需要进一步研究。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a617/5074045/7d2c723fe3e7/JPBS-8-71-g019.jpg
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X-ray diffraction of nitinol orthodontic arch wires.镍钛正畸弓丝的X射线衍射
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