Department of Restorative Dentistry, Riyadh Elm University, College of Dentistry, Riyadh, Saudi Arabia.
PLoS One. 2023 Aug 25;18(8):e0290744. doi: 10.1371/journal.pone.0290744. eCollection 2023.
To compare cyclic fatigue resistance and bending for three different nickel-titanium (NiTi) rotary files.
A sample of 90 NiTi instruments size (25.06) was divided into three groups with 30 files in each: Race Evo files (FKG Dentaire, Switzerland); Tia Tornado Blue files (TiaDent Inc., Texas- USA); One Curve files (Micro-Mega, France). Then each group was subdivided into two groups with 15 files in each; a bending test was performed for one group, and a dynamic cyclic fatigue test at body temperature was performed for the other group. Files fractured by cyclic fatigue were randomly picked from all tested groups for Scanning Electron Microscopy (SEM) (Jeol, Tokyo, Japan). In addition, the test included measuring the broken part of the files tested using (Electronic Micrometre Calliper with LCD Screen, Inch and Millimetre Conversion, Adoric- Taiwan). Data were statistically analyzed using a one-way ANOVA with Tukey-HSD post hoc test.
It was found that maximum load [gf] was less (meaning more flexible) in the group of Tia Tornado Blue with a statistically significant difference in comparison with Race Evo and One Curve. The number of cycles to fracture (NCF) in the Race Evo group was significantly higher than the groups of One Curve and Tia Tornado Blue.
Within the limitation of the study, it could be concluded that Race Evo files were more resistant to cyclic fatigue fracture and Tia Tornado Blue files were more flexible compared to the other tested files.
比较三种不同镍钛（NiTi）旋转锉的循环疲劳阻力和弯曲性能。
将 90 个镍钛器械样本（25.06 尺寸）分为三组，每组 30 个：Race Evo 锉（FKG Dentaire，瑞士）；Tia Tornado Blue 锉（TiaDent Inc.，德克萨斯州-美国）；One Curve 锉（Micro-Mega，法国）。然后将每组再分为两组，每组 15 个；一组进行弯曲试验，另一组进行体温下的动态循环疲劳试验。从所有测试组中随机抽取因循环疲劳而断裂的锉进行扫描电子显微镜（SEM）（日本东京 Jeol）观察。此外，还使用（带 LCD 屏幕的电子测微卡尺，英寸和毫米转换，Adoric-台湾）测量测试锉的断裂部分。使用单向方差分析和 Tukey-HSD 事后检验对数据进行统计学分析。
发现 Tia Tornado Blue 组的最大负载[gf]较低（意味着更柔韧），与 Race Evo 和 One Curve 相比具有统计学显著差异。Race Evo 组的断裂循环数（NCF）明显高于 One Curve 和 Tia Tornado Blue 组。
在研究的限制范围内，可以得出结论，与其他测试锉相比，Race Evo 锉的循环疲劳断裂阻力更高，而 Tia Tornado Blue 锉则更柔韧。
