Chakaravarthy Yadav, Prasad Vishnu, Dattatray Revankar Vanita, Karthikeyan Haripriya, Saravanan Suresh, Santosh Aishwarya
Conservative Dentistry and Endodontics, Vinayaka Mission's Sankarachariyar Dental College, Salem, IND.
Conservative Dentistry and Endodontics, Chettinad Dental College and Research Institute, Kelambakkam, IND.
Cureus. 2024 May 14;16(5):e60271. doi: 10.7759/cureus.60271. eCollection 2024 May.
Background The use of endodontic files multiple times can cause fatigue in them and can lead to their separation in the root canal. The purpose of this study was to achieve a reduction in cyclic fatigue stress in a newly introduced nickel-titanium (NiTi) rotary single-file system. The study aimed to determine whether cryotherapy could help reduce cyclic fatigue and stress on rotary files after multiple uses during root canal treatment. By utilizing finite element analysis (FEA), the study provided a comprehensive evaluation of how cryotherapy might enhance the performance and longevity of these instruments, ultimately benefiting patients undergoing root canal therapy. Methodology This in vitro comparative study used scanned plastic teeth with genuine root canal anatomy and FEA to investigate the mechanical response to cyclic fatigue and stress of NiTi rotary file system. The endodontic file (Procodile, Komet) was created through the complex root canal geometries, for which mandibular tooth models were scanned and created by a computer software (IDEAS11 NX; UGSiPlano, TX). The total sample size was 34, divided into two groups, with each group comprising 17 participants (n = 17). The results were analyzed by analysis of variance (ANOVA) test. Results The results revealed that the p-values were more than 0.525, indicating no significant reduction in cyclic fatigue when the NiTi rotary single-file system (Procodile, Komet) was treated with cryotherapy (eight cycles). However, stress reduction was observed in the NiTi rotary single-file system when it was treated with cryotherapy. Conclusion This in vitro comparative study concluded that cryotherapy helps to reduce the stress of NiTi rotary single-file system. Nonetheless, more research is needed to understand the clinical significance of the findings of the current in vitro study.
背景 多次使用根管锉会导致其疲劳，并可能导致其在根管内分离。本研究的目的是在一种新推出的镍钛（NiTi）旋转单根管锉系统中降低循环疲劳应力。该研究旨在确定冷冻疗法是否有助于减少根管治疗期间多次使用后旋转锉的循环疲劳和应力。通过利用有限元分析（FEA），该研究全面评估了冷冻疗法如何提高这些器械的性能和使用寿命，最终使接受根管治疗的患者受益。方法 这项体外比较研究使用具有真实根管解剖结构的扫描塑料牙齿和FEA来研究NiTi旋转锉系统对循环疲劳和应力的机械响应。通过复杂的根管几何形状创建根管锉（Procodile，Komet），为此扫描下颌牙齿模型并通过计算机软件（IDEAS11 NX；UGSiPlano，TX）创建。总样本量为34，分为两组，每组包括17名参与者（n = 17）。结果通过方差分析（ANOVA）测试进行分析。结果 结果显示，p值大于0.525，表明当对NiTi旋转单根管锉系统（Procodile，Komet）进行冷冻疗法（八个循环）时，循环疲劳没有显著降低。然而，当对NiTi旋转单根管锉系统进行冷冻疗法时，观察到应力降低。结论 这项体外比较研究得出结论，冷冻疗法有助于降低NiTi旋转单根管锉系统的应力。尽管如此，需要更多的研究来了解当前体外研究结果的临床意义。
