Evaluation of load transfer characteristics of five different implants in compact bone at different load levels by finite elements analysis
Evaluation of load transfer characteristics of five different implants in compact bone at different load levels by finite elements analysis
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DOI：
10.1016/j.prosdent.2004.07.024
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发表时间：
2004-12-01
影响因子：
4.6
通讯作者：
Muftu, A
中科院分区：
文献类型：
--
作者：
Bozkaya, D;Muftu, S;Muftu, A
陈述问题。种植体的外轮廓和咬合载荷的大小对载荷传递特性有显著影响，并可能导致不同种植体系统的不同骨失效率。本研究的目的是调查外部，几何形状和咬合负荷大小对5种市售牙科种植体系统骨破坏模式的影响。五种不同的植入系统; Ankylos.，阿斯特拉Bicon、ITI和Nobel Biocare。使用有限元法比较了尺寸相当但螺纹牙型和牙顶模数形状不同的两种牙型。II型骨质近似，并假设完全骨整合。在基牙上施加不同大小（0 ~ 2000 NI）的咬合载荷，使基牙与垂直轴成11.3度，偏移1 mm。总过载骨面积，其中拉伸和压缩正应力超出推荐限值100和170 MPa。分别对不同负荷水平进行了研究。对于中等水平的咬合载荷高达300 N，密质骨不会因任何种植体系统而过载。在咬合载荷范围的最大值（1000 N或更大），种植体的过载特性可能取决于几何形状。通常，超负荷发生在压缩状态下的密质骨的上级区域附近。并且它主要由咬合负荷的正常和侧向分量引起。在密质骨和松质骨的交叉区域，由于咬合载荷的垂直分量，在张力中发生过载。对于大于1000 N的过度力，骨的过载区域在所评价的S种不同种植体系统之间变化很大。
Statement of problem. The external contour of an implant and the magnitude of occlusal loading can have significant effects on the load transfer characteristics and may result in different bone failure rates for different implant systems.Purpose. The goal of this study was to investigate the effects of external,geometry and occlusal load magnitude on bone failure modes for 5 commercially, available dental implant systems.Material and methods. Five different implant systems; Ankylos., Astra., Bicon, ITI, and Nobel Biocare. comparable in size, but different in thread profile and crest module shapes, were compared using the finite element method. Type II bone quality was approximated and complete osseous intergration was assumed. Occlusal loads of varying magnitudes (0 to 2000 NI) were applied On the abutments supporting single tooth restorations at 11.3 degrees from the vertical axis with a 1-mm offset. Total overloaded bone area, where tensile and compressive normal stresses fell Outside of the recommended limits of 100 and 170 MPa. respctively, investigated for different load levels.Results. For moderate levels of occlusal loads up to 300 N, the compact bone was not overloaded by any of the implant systems. At the extreme end of the occlusal load range (1000 N or more) the overloading characteristics of implants may be dependent on geometric shape.Conclusion. In general, overloading occurs near the superior region of compact bone,, in compression. and it is primarily caused by the normal and lateral components of the occlusal load. At the region of intersection of compact and trabecular bone, overloading occurs in tension due to the vertical component of the occlusal load. For excessive forces greater than 1000 N, the overloaded areas of the bone varied considerably among S different implants systems evaluated.