Prediction of primary stability is a major challenge in the surgical planning of dental and orthopedic implants. Computational methods become attractive to estimate primary stability from clinical CT images, but implicit finite element analysis of implant press-fit faces convergence issues due to contact and highly distorted elements. This study aims to develop and validate an explicit finite element method to simulate the insertion and primary stability of a rigid implant in a deformable bone while accounting for damage occurring at the bone-implant interface. Accordingly, a press-fit experiment of a conical implant into predrilled bovine trabecular bone was designed and realized for six samples. A displacement-driven cyclic protocol was used to quantify the reaction force and stiffness of the bone-implant system. Homogenized finite element analyses of the experiments were performed by modeling contact with friction and converting an existing constitutive model with elasto-plasticity and damage of bone tissue to be applicable to an explicit time integration scheme where highly distorted elements get deleted. The computed reaction forces and unloading stiffnesses showed high correlations (R² = 0.95 and R² = 0.94) with the experiment. Friction between bone and implant exhibited a strong influence on both reaction force and stiffness. In conclusion, the developed explicit finite element approach with frictional contact and element deletion accounts properly for bone damage during press-fit and will help optimizing dental or orthopedic implant design towards maximal primary stability.

在牙科和整形外科植入物的外科手术计划中，主要稳定性的预测是一项重大挑战。计算方法开始从临床CT图像估计主要稳定性变得有吸引力，但是由于接触和高度变形的元素，植入物压入配合的隐式有限元分析面临收敛问题。这项研究的目的是开发和验证一种显式的有限元方法，以模拟可变形骨中刚性植入物的插入和主要稳定性，同时考虑在骨-植入物界面处发生的损伤。因此，针对六个样品设计并实现了将圆锥形植入物压入预钻孔的牛小梁骨中的压配合实验。位移驱动的循环协议用于量化骨植入系统的反作用力和刚度。通过对摩擦接触进行建模并转换现有的具有弹塑性和骨组织损伤的本构模型，对实验进行均质化的有限元分析，以适用于删除高度失真的元素的显式时间积分方案。计算出的反作用力和卸载刚度显示出很高的相关性（R²  = 0.95，R ²  = 0.94）。骨与植入物之间的摩擦对反作用力和刚度均表现出强烈的影响。总之，开发的带有摩擦接触和元件缺失的显式有限元方法可以正确解决压入配合过程中的骨损伤，并将有助于优化牙科或整形外科植入物的设计，以实现最大的基本稳定性。