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首页> 外文期刊>Communications in Numerical Methods in Engineering >Finite element comparison of the effect of absorbers' design in the surrounding bone of dental implants
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Finite element comparison of the effect of absorbers' design in the surrounding bone of dental implants

机译：牙种植体周围骨骼吸收体设计效果的有限元比较

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Despite the high success rate achieved in current dental implantation, there are still important problems to solve like incomplete early osteointegration, bone damage, and long-term implant loosening. Highly compliant stress absorbers are a possible solution to these problems. Although several works examined the stress-strain distribution in bone without and with absorbers to show their favorable results, none of them analyzed their impact on long-term remodeling. Here, we analyze this effect by comparing the evolution of stress and bone mass density without and with different designs of absorbers with those of the healthy tooth. Several finite element models with ABAQUS, corresponding to each design considered, were built to obtain the mechanical conditions in bone and implant. Then a mechanobiological bone remodeling model that considers damage accumulation and its repair during the remodeling process was used to compute the bone density redistribution. This approach allows assessing both the short-term density loss and the relative micromovement between bone and implant. We analyze the stress distributions in both bone and implant as well as the relative micromovement of the implant. We also present the evolution of damage and bone volume fraction. These results show that the addition of absorbers can reduce the stress in the bone around the implant. The obtained results also show that using stress absorbers reduces damage in bone, while increasing the number of absorbers does not necessarily improves damage reduction. We conclude that using implants with a correct design of absorbers prevents damage and stress shielding, reducing implant loosening.
机译：尽管当前的牙科植入术获得了很高的成功率，但是仍然存在重要的问题需要解决，例如早期的骨整合不完全，骨骼损伤以及植入物长期松动。高度顺应的应力吸收器可能是解决这些问题的方法。尽管有几项研究检查了在不使用吸收器和使用吸收器的情况下骨骼的应力应变分布，以显示出令人满意的结果，但他们都没有分析其对长期重塑的影响。在这里，我们通过比较无牙吸收器和有健康牙齿的吸收器的应力和骨质量密度的变化来分析这种影响。建立了几个与ABAQUS相对应的有限元模型，这些模型与所考虑的每种设计相对应，以获取骨骼和植入物的机械条件。然后，使用考虑损伤累积及其在重构过程中的修复的力学生物学骨重构模型来计算骨密度的重新分布。这种方法既可以评估短期密度损失，也可以评估骨骼与植入物之间的相对微动。我们分析了骨骼和植入物中的应力分布以及植入物的相对微动。我们还介绍了损伤和骨体积分数的演变。这些结果表明，添加吸收剂可以减少植入物周围骨骼的应力。获得的结果还表明，使用应力吸收器可减少骨骼损伤，而增加吸收器的数量并不一定会改善损伤减小率。我们得出的结论是，使用具有正确设计的吸收体的植入物可防止损坏和应力屏蔽，从而减少植入物的松动。

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