Influence of distal-end heat treatment in the properties of heat-activated NiTi archwires.

IF 1.3 4区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Janaína de Oliveira Abrahão, Rodrigo Hermont Cançado, Esdras de Campos França, Leandro de Arruda Santos, Pedro Damas Resende, Felipe Weidenbach Degrazia, Leniana Santos Neves
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引用次数: 0

Abstract

Purpose: The aim of this study was to evaluate the extent of property changes caused by heating the distal portion of heat-activated nickel-titanium (NiTi) wires.

Methods: Forty preformed heat-activated NiTi archwires (3M Unitek, Monrovia, CA, USA) with a nominal cross-section of 0.018″ were used in this study. The archwires were divided into a control group, not submitted to heat treatment and, thus, maintaining the as-received properties, and an experimental group, in which the archwires were submitted to heat treatment for distal bending at one end. Wire segments of control and experimental groups were submitted to differential scanning calorimetry (DSC) and Vickers microhardness measurements.

Results: The DSC results suggest local recrystallization and precipitate dissolution at the heat-treated tip, which decreases as the distance to the wire's tip increases. Vickers microhardness tests revealed significant changes for distances between 6 and 8 mm from the wire's tip. Heating the distal portion of heat-activated NiTi archwires should be performed with care since this clinical procedure may compromise the performance of these wires to a distance of 8 mm from the archwire end.

Conclusion: Heat treatment for distal bending in heat-activated NiTi archwires may be performed, with little impact on the areas adjacent to heat treatment. In cases presenting molars requiring significant orthodontic corrections, it should be preferred to apply other techniques to avoid archwire sliding, such as crimpable stops, or to have flame control to avoid placing a heat-treated section in the tubes of these molars.

Abstract Image

远端热处理对热激活镍钛弓丝性能的影响。
目的:本研究旨在评估加热热激活镍钛丝(NiTi)远端部分所引起的性能变化程度:本研究使用了 40 根预制的热激活镍钛弓丝(3M Unitek, Monrovia, CA, USA),其标称横截面为 0.018″。弓丝被分为对照组和实验组,对照组未进行热处理,因此保持了收到时的特性,实验组则对弓丝的一端进行了远端弯曲热处理。对对照组和实验组的金属丝段进行了差示扫描量热法(DSC)和维氏显微硬度测量:差示扫描量热结果表明,热处理后的丝尖存在局部再结晶和沉淀溶解现象,这种现象随着与丝尖距离的增加而减少。维氏硬度测试表明,距金属丝尖端 6 至 8 毫米的距离有显著变化。加热热激活镍钛弓丝的远端部分时应小心谨慎,因为在距弓丝末端8毫米处进行这种临床操作可能会影响弓丝的性能:可以对热激活镍钛弓丝的远端弯曲进行热处理,对热处理邻近区域的影响很小。对于需要进行大量正畸矫正的磨牙,最好采用其他技术来避免弓丝滑动,例如压接止动装置,或者进行火焰控制,以避免在这些磨牙的管内放置热处理部分。
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
CiteScore
3.90
自引率
0.00%
发文量
64
审稿时长
>12 weeks
期刊介绍: The Journal of Orofacial Orthopedics provides orthodontists and dentists who are also actively interested in orthodontics, whether in university clinics or private practice, with highly authoritative and up-to-date information based on experimental and clinical research. The journal is one of the leading publications for the promulgation of the results of original work both in the areas of scientific and clinical orthodontics and related areas. All articles undergo peer review before publication. The German Society of Orthodontics (DGKFO) also publishes in the journal important communications, statements and announcements.
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