评估直径,长度,夹板或非夹板形式,冠与种植体比例对后下颌超短种植体周围应力分布的影响:有限元分析。

Hossein Salehivaziri, Hojatollah Yousefimanesh, Leila Golpasand Hagh, Mahmoud Jahangirnezhad
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引用次数: 0

摘要

目的:在过去的十年中,种植学的重大进步扩大了颌面重建的治疗选择。本研究旨在探讨六种不同治疗方案下下颌超短种植体替代两颗磨牙时周围骨的应力分布。材料和方法:在本实验研究中,将预先存在的锥束计算机断层扫描(CBCT)数据集导入图像处理软件(Mimics和3-matic)中,使用有限元分析(FEA)创建精确的三维(3D)下颌轮廓。根据种植体直径、牙冠高度、夹板或非夹板形式,在30度角施加100 N载荷的情况下,确定了18种用于重建第一和第二下颌磨牙的模型。使用两个长度为4mm,直径为4.1mm或4.8mm的超短种植体。冠高分别为15mm、12.5mm和10mm。结果:皮质骨、骨小梁、固定物和牙冠的应力研究显示,当两颗种植体直径4.1mm不带夹板、牙冠高度15mm时,皮质骨的应力水平最高(如118.27 MPa)。相反,两颗种植体直径4.8mm,无夹板,冠高10mm的治疗方案中,应力最小(皮质骨应力为29.12 MPa)。冠高对应力的影响最大(可增加237.6%),其次是冠径(可减少63.7%,在冠高处减弱),而夹板的效果各不相同(如在特定情况下,冠应力增加+122.7%);皮质骨保持在130兆帕以下的安全区域,但小梁骨经常超过10兆帕。结论:在本研究概述的所有治疗方案中,增加非夹板种植体的牙冠高度会导致应力分布增加,静态分析提示小梁骨风险,需要进行疲劳研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the Effects of Diameter, Length, Splinted or Non- Splinted Forms, and Crown-to-Implant Ratio on the Stress Distribution around Extra-Short Implants in the Posterior Mandible: Finite Element Analysis.

Purpose: Significant advancements in implantology over the past decade have expanded treatment options for maxillofacial reconstructions. This study aimed to investigate the distribution of stress in the bone around extra-short posterior mandibular implants to replace two molar teeth in six different treatment plans.

Materials and methods: In this experimental study, pre-existing cone beam computed tomography (CBCT) data sets were imported into image processing software (Mimics and 3-matic) to create accurate three-dimensional (3D) mandibular contours using finite element analysis (FEA). A total of 18 models for the reconstruction of the first and second mandibular molars were defined based on the implant diameter, crown height, and splinted or non-splinted forms, with a 100 N load applied at a 30- degree angle. Two extra-short implants with a length of 4mm and diameters of 4.1mm or 4.8mm were utilized. The crown heights were also 15mm, 12.5mm, and 10mm.

Results: The study of stresses in cortical bone, trabecular bone, fixture, and crown revealed that the highest stress levels (e.g., 118.27 MPa in cortical bone) were associated with the treatment pla involving two implants with a diameter of 4.1mm without a splint and a crown height of 15mm. Conversely, the lowest amount of stress (e.g., 29.12 MPa in cortical bone) was observed in the treatment plan with two implants with a diameter of 4.8mm without a splint and a crown height of 10mm. Crown height most influenced stress (up to 237.6% increase), followed by diameter (up to 63.7% reduction, weakened at higher crowns), while splinting effects varied (e.g., +122.7% crown stress increase in specific cases); cortical bone stayed below a 130 MPa safe zone, but trabecular bone often exceeded 10 MPa.

Conclusion: Increasing the height of the crown in non-splinted implants leads to an increase in stress distribution in all cases of the treatment plan outlined in this study, with static analysis suggesting trabecular bone risk and a need for fatigue studies.

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