不同种植体-基台界面角度下莫尔斯(锥)型种植体连接的生物力学行为:有限元研究

Michel Faivro Almeida Serpa, B. Sotto-Maior, C. Francischone, M. A. Ribeiro, Wellington Lima
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摘要

【摘要】目的:通过三维有限元法评价锥形假体连接不同内角对三要素部分固定假体生物力学行为的影响。方法:两种不同的下颌后段模型,两种种植体以11.5度和16度的角度进行圆锥形连接。然后,使用180N的咬合负荷,在前磨牙上分为2个施点,在磨牙上分为400N 5个施点。在三单元固定部分假体中,获得皮质骨和髓骨的拉伸、压缩和剪切应力,以及两种假体和假体部件的von Mises应力。在定量分析中,无论是皮质骨还是髓质骨,CM16组的拉伸、压缩和剪切力的张力峰值都更高。结果:定性分析时,种植体平台周围皮质骨和髓质骨的应力较大,磨牙区种植体的应力发生率较高。在两组的von mises分析中,张力集中在种植体的颈椎区域,在第一螺纹,在前磨牙和磨牙区域。对于假体支柱,应力集中位于与种植体接触的区域。结论:内锥形连接的锥形角度增加是种植体、假体构件和邻近结构(如皮质骨和髓骨)应力集中增加的决定性因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Biomechanical behavior of implants with prosthetic connection of the morse (Cone) type, with different angulations at the implant-abutment interface in multiple dental prostheses: a finite element study
ABSTRACT Objective: Evaluate the biomechanical behavior of the influence of different internal angles of conical prosthetic connections in fixed partial prostheses of three elements, through the tridimensional finite element method. Methods: Two different models of segment of the posterior portion of the mandible, with two implants with conical connections at angulations of 11.5 and 16 degrees. Afterwards, and occlusal load of 180N was used, and divided into 2 points of application on the premolar, and 400N divided into 5 points of application on the molar. Data were acquired as the tensile, compressive and shear stresses on cortical and medullary bone, and von Mises stresses on implants and prosthetic components of two implants in both in three-unit fixed partial prosthesis. In the quantitative analysis, both in cortical and medullary bone, the tension peaks in tensile, compression, and shear forces were higher for the CM16 group. Results: When analyzing qualitatively, the cortical and medullary bones presented a greater stress around the implant platform with a higher incidence in the implant in the molar region. In the von Misses analysis in both groups, the tensions were concentrated in the cervical region of the implants, in the first threads, in the premolar and molar regions. Regarding prosthetic pillars, the stress concentration was located in the region of contact with the implant. Conclusion: The increased angulation of conicity of the internal conical connections represents a determinant factor to increase in stress concentration in the implants, prosthetic components and adjacent structures, such as the cortical and medullary bone.
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