V Saranya, Harris Mervin, Abraham Silpa, Venkitachalam Ramanarayanan, Nair Shiv Shankar, Mathew Anil
Department of Prosthodontics and Crown & Bridge, Amrita School of Dentistry, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India.
Department of Public Health Dentistry, Amrita School of Dentistry, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India.
J Oral Biol Craniofac Res. 2024 Nov-Dec;14(6):761-766. doi: 10.1016/j.jobcr.2024.10.003. Epub 2024 Oct 18.
This study aimed to investigate the effects of different commercially available complex implant macro designs on stress distributions using Finite element analysis. The experiment is done under varying simulated bone conditions to provide reference for clinical application.
The study employed the Finite Element Analysis (FEA) method to compare four commercially available complex implant macro designs on a Computer-Aided Design (CAD) model of a maxillary bone segment. The three-dimensional geometrical model of the implants was reconstructed from computed tomography (CT)-slices in Digital Imaging and Communications in Medicine (DICOM) format and contact condition between the implant and the bone was considered as 'Bonded', implying perfect osseointegration. All materials used in the models were assumed to be isotropic, homogeneous, and linearly elastic. The Finite element simulations employed load of 400 N under both axial and non-axial conditions Stresses were analysed under different bone conditions.
Average values of von Mises stresses were used for comparing stress levels between implant designs. There was a definite increase in the equivalent stress values from higher density(D1)to lower density (D4) bone conditions for all implants. The percentage of increase ranged from 23.63 to 49.39 on axial loading and 20.39 to 57.19 when subjected to non-axial loading. The equivalent stress values resulted from non-axial loading were 1.78-2.94 times higher than that of axial loading for all implants under all bone densities. Among the complex designs Equinox Myriad Plus implant exhibited the least stress under axial loading (12.749-19.046 MPa) and (37.462-49.217 MPa) for non-axial loading. The stress on the crestal module was higher (1.49-2.99 times) than the overall stress on the implant regardless of the loading direction or bone conditions.
Data from the present study shows Equinox Myriad Plus implant generating the least equivalent stress and this can be taken as indicator in the biomechanical performance of the design.
本研究旨在通过有限元分析，探讨不同市售复杂种植体宏观设计对应力分布的影响。实验在不同的模拟骨条件下进行，为临床应用提供参考。
本研究采用有限元分析（FEA）方法，在上颌骨节段的计算机辅助设计（CAD）模型上比较四种市售复杂种植体宏观设计。种植体的三维几何模型由医学数字成像和通信（DICOM）格式的计算机断层扫描（CT）切片重建，种植体与骨之间的接触条件被视为“粘结”，意味着完美的骨整合。模型中使用的所有材料均假定为各向同性、均匀且线弹性。有限元模拟在轴向和非轴向条件下采用400 N的载荷，分析不同骨条件下的应力。
采用von Mises应力平均值比较种植体设计之间的应力水平。对于所有种植体，从较高密度（D1）到较低密度（D4）的骨条件下，等效应力值有明显增加。轴向加载时增加百分比范围为23.63%至49.39%，非轴向加载时为20.39%至57.19%。在所有骨密度下，所有种植体非轴向加载产生的等效应力值比轴向加载高1.78至2.94倍。在复杂设计中，Equinox Myriad Plus种植体在轴向加载（12.749 - 19.046 MPa）和非轴向加载（37.462 - 49.217 MPa）下表现出最小应力。无论加载方向或骨条件如何，嵴模块上的应力均高于种植体上的总应力（1.49至2.99倍）。
本研究数据表明，Equinox Myriad Plus种植体产生的等效应力最小，这可作为该设计生物力学性能的指标。
