The effect of different separated file retrieval strategies on the biomechanical behavior of a mandibular molar: a finite element analysis study.

IF 3.5 2区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of endodontics Pub Date : 2024-10-29 DOI:10.1016/j.joen.2024.10.008
Anas Sira, Nawar Naguib Nawar, Shehabeldin Mohamed Saber, Hyeon-Cheol Kim
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Abstract

Introduction: This study evaluated the effects of retrieval strategies of separated nickel-titanium (NiTi) files on the biomechanical behavior of endodontically treated teeth by finite element analysis (FEA).

Methods: Six FE models were created; IT: intact tooth, SF: simulated a scenario where the apical 3 mm of a NiTi file is separated and retained, TD: simulated application of a trephine drill to expose 1 mm of the separated file, US180: simulated troughing of 180⁰ at the inner wall of root canal for an extra 1 mm of the separated file beyond the staging platform, US360: simulated circumferential ultrasonic troughing done for an extra 1 mm after the TD, and PM: simulated iatrogenic perforation sealed using MTA. Occlusal loading followed the occlusal fingerprint of the tooth before maximum von Mises stresses (vMS), maximum principal stresses (MPS), safety factor, and number of cycles (NCF) till failure were determined. Cervical region of the teeth and mid-root sections including the separated file were chosen as the areas of interest for further analysis.

Results: IT recorded the highest NCF and safety factor. Other models showed a narrow range of variation in all aspects with the PM recording the lowest NCF. The highest vMS was recorded at the mesiobuccal line angle of the PM near its cervical margin, while the lowest was found at the IT.

Conclusion: Under the limitation of this study, various file retrieval strategies removing the surrounding root dentin within the amounts of general guidelines do not affect the biomechanical behavior of the tooth.

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不同分离文件检索策略对下颌臼齿生物力学行为的影响:有限元分析研究。
简介:本研究通过有限元分析(FEA)评估了分离镍钛(NiTi)锉的回收策略对根管治疗牙齿生物力学行为的影响:本研究通过有限元分析(FEA)评估了分离的镍钛(NiTi)锉回收策略对根管治疗牙齿生物力学行为的影响:创建了六个有限元模型:IT:完整牙齿;SF:模拟分离并保留镍钛锉顶端 3 毫米的情况;TD:模拟使用穿刺钻暴露 1 毫米的分离锉;US180:US180:模拟在根管内壁进行 180⁰切槽,使分离的锉刀在分期平台外多出 1 毫米;US360:模拟在 TD 后进行周向超声波切槽,使分离的锉刀多出 1 毫米;PM:模拟使用 MTA 封闭先天性穿孔。在确定最大冯米斯应力(vMS)、最大主应力(MPS)、安全系数和直至失效的循环次数(NCF)之前,按照牙齿的咬合指纹进行咬合加载。牙颈部和包括分离锉在内的牙根中段被选为进一步分析的重点区域:IT 记录了最高的 NCF 和安全系数。其他模型在各方面的变化范围较小,其中 PM 的 NCF 最低。在 PM 接近其颈缘的中颊面角处,vMS 值最高,而在 IT 处则最低:在本研究的限制条件下,在一般指导原则的范围内去除周围牙根牙本质的各种锉回收策略不会影响牙齿的生物力学行为。
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来源期刊
Journal of endodontics
Journal of endodontics 医学-牙科与口腔外科
CiteScore
8.80
自引率
9.50%
发文量
224
审稿时长
42 days
期刊介绍: The Journal of Endodontics, the official journal of the American Association of Endodontists, publishes scientific articles, case reports and comparison studies evaluating materials and methods of pulp conservation and endodontic treatment. Endodontists and general dentists can learn about new concepts in root canal treatment and the latest advances in techniques and instrumentation in the one journal that helps them keep pace with rapid changes in this field.
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