Department of Mechanical Engineering, Boğaziçi University, İstanbul, Turkey.
Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, Texas, USA.
Aust Endod J. 2024 Apr;50(1):97-109. doi: 10.1111/aej.12813. Epub 2023 Nov 23.
The purpose of the study is to evaluate the influence of the pecking motion (reciprocal axial motion) surgical technique on the durability behaviour of the Nickel-Titanium endodontic files using Finite Element Analysis (FEA). A commonly used endodontic file, ProTaper Universal F2, is selected for the study. Root canal treatment procedure is simulated on a test-bench (simulated root canal) proposed by G. Gambarini for cyclic fatigue loading of endodontic files with and without the pecking motion via FEA. The hysteresis energy density is used as evaluation criteria for low cycle fatigue life estimation of Shape Memory Alloy files. In an additional study, the root canal treatment procedure is also simulated for an FEA model of a molar tooth with significant root canal curvature to understand the influence of the realistic curvature of a root canal on the fatigue behaviour of endodontic files. For the simulated root canal, analysis accurately predicts the endodontic file's failure location, and fatigue life estimation based on the hysteresis energy density is shown to increase significantly with the introduction of the pecking motion, an observation confirmed by reported experimental results. Molar tooth simulations reveal greater file fatigue resistance than in simulated root canals, confirming the pecking motion's efficacy in enhancing file durability, even in real root canal conditions. Simulations indicate that the pecking motion technique increases the fatigue life of endodontic files for simulated as well as real root canals and the hysteresis energy is confirmed as an acceptable parameter to quantify fatigue life of Nickel-Titanium endodontic files.
本研究旨在通过有限元分析（FEA）评估啄切运动（往复轴向运动）手术技术对镍钛根管锉耐用性的影响。选择一种常用的根管锉 ProTaper Universal F2 进行研究。G. Gambarini 提出了一种根管治疗模拟工作台（模拟根管），用于对带有和不带有啄切运动的根管锉进行循环疲劳加载。迟滞能量密度被用作评估形状记忆合金锉低周疲劳寿命的标准。在另一项研究中，根管治疗程序也针对具有显著根管弯曲的磨牙的 FEA 模型进行了模拟，以了解根管实际弯曲对根管锉疲劳性能的影响。对于模拟根管，分析准确预测了根管锉的失效位置，并且基于迟滞能量密度的疲劳寿命估计表明，随着啄切运动的引入，疲劳寿命显著增加，这一观察结果得到了报道的实验结果的证实。磨牙模拟表明，与模拟根管相比，根管锉的疲劳抗力更大，这证实了啄切运动技术在增强根管锉耐用性方面的有效性，即使在实际根管条件下也是如此。模拟表明，啄切运动技术增加了模拟和实际根管中根管锉的疲劳寿命，并且迟滞能量被确认为量化镍钛根管锉疲劳寿命的可接受参数。
