Effects of abutment screw preload and preload simulation techniques on dental implant lifetime.
Effects of abutment screw preload and preload simulation techniques on dental implant lifetime.
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基台螺钉预紧力和预紧力模拟技术对种植牙寿命的影响
DOI：
10.1016/j.jfscie.2022.100010
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发表时间：
2022-01-01
期刊：
影响因子：
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通讯作者：
Griggs, Jason A
中科院分区：
文献类型：
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作者：
Satpathy, Megha;Jose, Rose M;Griggs, Jason A
背景资料：本研究旨在探讨如何预测种植体疲劳寿命的影响连接器螺钉预载荷和有限元分析方法用于模拟preload.Methods的损失：牙种植体组件（DI 1，Biomet-3 i外部六角; Zimmer Biomet）进行扫描，使用微型计算机断层扫描和测量使用Mimics软件（Materialise）和光学显微镜。使用SolidWorks软件（Dassault Systemes）构建数字复制品。在Abaqus（Dassault Systemes）中指定材料性质。在30°离轴载荷下施加外部载荷。针对DI 1模拟了8个水平的连接器螺钉预载荷（范围，0-32 Ncm）。比较了该组装件和具有更长和更窄螺钉的附加型号（DI 2）的疲劳极限（使用fe-safe软件[Dassault Systemes]）进行2种预加载方法：（1）增加预加载扭矩或（2）增加螺栓轴向拉力。在有和没有预载荷的情况下，DI 1（连接器螺纹上）的最大von Mises应力分别为439.90 MPa和587.90 MPa。从100%到80%的制造商建议的预载荷，预测的疲劳极限是相同的，并在80%和70%预载荷之间急剧下降。与螺钉轴向拉伸相比，在螺钉上施加预载荷扭矩可使螺钉上的应力分布更加均匀，尤其是对于螺钉长度和宽度均大于DI 1的DI 2。结论：在不影响种植体抗疲劳性能的前提下，可以承受较大的预载荷损失。应使用扭矩而不是螺栓轴向张力来构建计算机模型。
Background: This study aimed to investigate how the predicted implant fatigue lifetime is affected by the loss of connector screw preload and the finite element analysis method used to simulate preload.Methods: A dental implant assembly (DI1, Biomet-3i external hex; Zimmer Biomet) was scanned using microcomputed tomography and measured using Mimics software (Materialise) and an optical microscope. Digital replicas were constructed using SolidWorks software (Dassault Systemes). The material properties were assigned in Abaqus (Dassault Systemes). An external load was applied at 30° off-axial loading. Eight levels of connector screw preload (range, 0-32 Ncm) were simulated for DI1. This assembly and an additional model (DI2) having a longer and narrower screw were compared regarding their fatigue limits (using fe-safe software [Dassault Systemes]) for 2 preloading methods: (1) adding preload torque or (2) adding bolt axial tension.Results: The maximum von Mises stresses of DI1 (on the connector screw threads) with and without preload were 439.90 MPa and 587.90 MPa. The predicted fatigue limit was the same for preloads from 100% through 80% of the manufacturer's recommendation and dropped precipitously between 80% and 70% preload. Adding a preload torque on the screw resulted in a more uniform stress distribution on the screw compared with bolt axial tension, especially for DI2, which had a longer and narrower screw than DI1.Conclusions: A substantial loss of preload can be accommodated without compromising the fatigue resistance of this dental implant. Computer models should be constructed using torque instead of a bolt axial tension.