Effect of A Clinical-Replicable Cooling Protocol on the Cyclic Fatigue Resistance of Heat-Treated Nickel-Titanium Instruments.

Q3 Dentistry

Iranian Endodontic Journal Pub Date : 2022-01-01 DOI:10.22037/iej.v17i3.37210

Luana Heck, Theodoro Weissheimer, Pedro Henrique Souza Calefi, Murilo Priori Alcalde, Rodrigo Ricci Vivan, Ricardo Abreu da Rosa, Marco Antonio Hungaro Duarte, Marcus Vinicius Reis Só

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Abstract

Introduction: The aim of this study was to evaluate the bending and cyclic fatigue resistance of Wave One Gold (WOG) and X1 Blue (X1B) instruments when tested at body temperature (36°C ± 1°C) with and without subjected to an alloy cooling protocol.

Materials and methods: A total of sixty instruments (n=30) were tested. Forty instruments (n=20) were randomly selected and divided into two groups: body temperature (BT; n=20) and body temperature with cooling protocol (CP; n=20). Cyclic fatigue test was performed until fracture in a conventional stainless-steel device with water bath equipment to simulate body temperature. CP group instruments were subjected to 5 seconds of spray cooling every 30 seconds. Time to fracture was recorded in seconds. Resistance to bending at an angle of 45 degrees was evaluated using twenty instruments (n=10). Fractured surfaces were examined under scanning electron microscopy (SEM). Statistical analysis was performed at a 5% significance level. Results: There was no difference in the cyclic fatigue resistance between instruments in BT groups (P>0.05). Cooling protocol significantly increased the cyclic fatigue resistance of X1B instruments (P=0.0003) and WOG instruments (P=0.0003).

Results: WOG instruments had a significantly lower cyclic fatigue resistance compared to X1B instruments in CP group (P=0.0001). There were no significant differences between the values of resistance increase presented by the instruments after cooling (P>0.05). Bending test presented no statistically significant differences between the tested instruments (P>0.05). Both instruments in both groups showed typical features of cyclic fatigue behavior under SEM.

Conclusions: X1 Blue #25.06 and WaveOne Gold #25.07 instruments presented similar cyclic fatigue resistance. The investigated clinical-replicable cooling protocol improved the cyclic fatigue resistance of the tested instruments, with X1 Blue #25.06 presenting a greater cyclic fatigue resistance after cooling. Both instruments presented a similar bending capacity.

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可临床复制的冷却方案对热处理镍钛器械耐循环疲劳性的影响

引言：本研究旨在评估Wave One Gold（WOG）和X1 Blue（X1B）器械在体温（36°C ± 1°C）下进行合金冷却和不进行合金冷却测试时的抗弯曲和抗循环疲劳性能：共测试了六十台仪器（n=30）。随机选取 40 台器械（n=20），分为两组：体温组（BT；n=20）和体温加冷却组（CP；n=20）。循环疲劳试验是在传统的不锈钢装置中进行的，装置中使用水浴设备模拟体温，直至断裂。CP 组仪器每隔 30 秒进行 5 秒钟的喷雾冷却。断裂时间以秒为单位记录。使用 20 个器械（n=10）对 45 度角的抗弯曲性进行评估。在扫描电子显微镜（SEM）下检查断裂表面。以 5%的显著性水平进行统计分析。结果显示BT 组器械之间的抗循环疲劳性没有差异（P>0.05）。冷却方案明显提高了X1B器械（P=0.0003）和WOG器械（P=0.0003）的抗循环疲劳性：结果：在 CP 组中，WOG 仪器的抗循环疲劳强度明显低于 X1B 仪器（P=0.0001）。仪器冷却后的阻力增加值之间没有明显差异（P>0.05）。测试仪器之间的弯曲测试差异无统计学意义（P>0.05）。两组仪器在扫描电镜下都显示出典型的循环疲劳行为特征：结论：X1 Blue #25.06和WaveOne Gold #25.07器械具有相似的抗循环疲劳性能。所研究的临床可复制冷却方案提高了测试器械的抗循环疲劳性能，其中 X1 Blue #25.06 在冷却后具有更强的抗循环疲劳性能。两种器械的弯曲能力相似。

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来源期刊

Iranian Endodontic Journal Dentistry-Dentistry (all)

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

12 weeks

期刊介绍： The Iranian Endodontic Journal (IEJ) is an international peer-reviewed biomedical publication, the aim of which is to provide a scientific medium of communication for researchers throughout the globe. IEJ aims to publish the highest quality articles, both clinical and scientific, on all aspects of Endodontics. The journal is an official Journal of the Iranian Center for Endodontic Research (ICER) and the Iranian Association of Endodontists (IAE). The Journal welcomes articles related to the scientific or applied aspects of endodontics e.g. original researches, systematic reviews, meta-analyses, review articles, clinical trials, case series/reports, hypotheses, letters to the editor, etc. From the beginning (i.e. since 2006), the IEJ was the first open access endodontic journal in the world, which gave readers free and instant access to published articles and enabling them faster discovery of the latest endodontic research.