Fatigue is the most common mechanical failure type in dental implants. ISO 14801 standardizes fatigue testing of dental implants, providing the load-life curve which is most useful for comparing the fatigue behavior of different dental implant designs. Based on it, many works were published in the dental implant literature, comparing different materials, component geometries, connection types, surface treatments, etc. These works are useful for clinicians in order to identify the best options available in the market. The present work is intended not for clinicians but for dental implant manufacturers, developing a design tool that combines Finite Element Analysis, fatigue formulation and ISO 14801 experimental tests. For that purpose, 46 experimental tests were performed on BTI INTERNA^® IIPSCA4513 implants joined with INPPTU44 abutments by means of INTTUH prosthetic screws under three different tightening torque magnitudes. Then, the load case was reproduced in a FE model from where the nominal stress state in the fatigue critical section was worked out. Finally, Walker criterion was used to represent accurately the effects of mean stress and predict fatigue life of the studied dental implant assembly, which can be extended to most of the products of BTI manufacturer. By means of this tool, dental implant manufacturers will be able to identify the critical design and assembly parameters in terms of fatigue behavior, evaluate their influence in preliminary design stages and consequently design dental implants with significantly better fatigue response which in turn will reduce future clinical incidences.

中文翻译：

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牙种植体组件的疲劳设计：一种名义应力方法

疲劳是牙科植入物中最常见的机械故障类型。ISO 14801对牙植入物的疲劳测试进行了标准化，提供了负载寿命曲线，该曲线对于比较不同牙植入物设计的疲劳行为最有用。基于此，在牙科植入物文献中发表了许多著作，比较了不同的材料，组件的几何形状，连接类型，表面处理等。这些著作对临床医生很有用，以便确定市场上可用的最佳选择。目前的工作不是针对临床医生，而是针对牙种植体制造商，他们开发了一种结合了有限元分析，疲劳公式化和ISO 14801实验测试的设计工具。为此目的，46个实验测试在BTI INTERNA执行^®IIPSCA4513植入物通过INTTUH修复螺钉在三种不同的拧紧扭矩大小下与INPPTU44基台连接。然后，在有限元模型中重现载荷工况，从中得出疲劳临界区的标称应力状态。最后，使用沃克准则来精确表示平均应力的影响并预测所研究的牙种植体组件的疲劳寿命，这可以扩展到BTI制造商的大多数产品。借助该工具，牙科植入物制造商将能够识别疲劳行为方面的关键设计和装配参数，评估其在初步设计阶段的影响，从而设计出具有明显更好的疲劳响应的牙科植入物，从而减少将来的临床应用发生率。