Department of Continuum Mechanics and Structural Analysis, Higher Polytechnic School, Carlos III University, Avenida de la Universidad, 30, 28911, Leganés, Madrid, Spain; ASISA Dental. Research Department, C/ José Abascal, 32, 28003 Madrid, Spain.
Department of Medicine and Surgery, Faculty of Health Sciences, Rey Juan Carlos University, Avda. Atenas s/n, 28922, Alcorcón, Madrid, Spain.
J Mech Behav Biomed Mater. 2019 Feb;90:165-172. doi: 10.1016/j.jmbbm.2018.10.016. Epub 2018 Oct 12.
To evaluate the bending and torsional properties of four nickel-titanium endodontic files, we simulated and compared WaveOne® primary size 25 with 0.07 taper, WaveOne Gold® primary size 25 with 0.07 taper, Reciproc® primary size 25 with 0.08 taper, and Reciproc Blue® primary size 25 with 0.08 taper. Three-dimensional models were created using computer-aided design software and numerically analyzed in ANSYS® Workbench. Boundary conditions for the numerical analyses were based on the ISO 3630-1 specifications. The highest stress levels were recorded for WaveOne® and Reciproc®. Numerical results of the bending test showed that WaveOne Gold® is 86% more flexible than WaveOne® with a deflection of 3 mm. Reciproc Blue® was 42.31% more flexible than Reciproc® file with a deflection of 3 mm. The WaveOne® instrument withstood the highest stress under the torsion test, followed by Reciproc®, then Reciproc Blue® files. The stress under torsion in the WaveOne® and WaveOne Gold® files is reduced in a 51%. Regarding Reciproc® and Reciproc Blue® files, the stress under torsional moments remains very similar. Our results exposed a considerable difference in terms of stress tolerance between WaveOne® and WaveOne Gold®. However, Reciproc® files demonstrated a similar stress distribution. The results obtained through finite element analysis suggest that thermal treatment of files might improve their flexibility, increasing resistance during the preparation of highly curved canals. Also, the values obtained regarding the improvement of flexibility were in accordance with the manufacturer claims.
为了评估四种镍钛根管锉的弯曲和扭转性能，我们模拟并比较了以下四种器械：WaveOne® 首锥度 0.07 、WaveOne Gold® 首锥度 0.07 、Reciproc® 首锥度 0.08 、Reciproc Blue® 首锥度 0.08 。使用计算机辅助设计软件创建三维模型，并在 ANSYS® Workbench 中进行数值分析。数值分析的边界条件基于 ISO 3630-1 规范。记录到的最高应力水平出现在 WaveOne® 和 Reciproc® 上。弯曲试验的数值结果表明，WaveOne Gold® 比 WaveOne® 弯曲 3mm 时的柔韧性高 86%。Reciproc Blue® 比 Reciproc® 弯曲 3mm 时的柔韧性高 42.31%。在扭转试验中，WaveOne® 器械承受的应力最高，其次是 Reciproc® ，然后是 Reciproc Blue® 。在 WaveOne® 和 WaveOne Gold® 器械中，扭转产生的应力降低了 51%。对于 Reciproc® 和 Reciproc Blue® 器械，扭转力矩下的应力保持非常相似。我们的结果表明，WaveOne® 和 WaveOne Gold® 在耐受力方面存在显著差异。然而，Reciproc® 器械表现出相似的应力分布。通过有限元分析得到的结果表明，器械的热处理可能会提高其柔韧性，在制备高度弯曲的根管时增加其阻力。此外，关于柔韧性提高的数值与制造商的宣称相符。
