Wu Yu-Ling, Tsai Ming-Hsu, Chen Hung-Shyong, Lin Ching-Ping, Wu Aaron Yu-Jen
Department of Dentistry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.
Department of Mechanical Engineering, Cheng Shiu University, Kaohsiung 833, Taiwan.
Materials (Basel). 2022 Aug 28;15(17):5952. doi: 10.3390/ma15175952.
Bone resorption around implants is quite common, and the maturity and popularization of computer-aided design and computer-aided manufacturing (CAD/CAM) technology have made the use of aftermarket abutment screws more widespread. This study aimed to explore the biomechanical influence of these two common factors on the internal stress of an implant system using three-dimensional finite element analysis (3D FEA). The FEA results indicated that under the same loading conditions, the use of an aftermarket screw had the greatest impact on the screw itself among the three components of the implant system, while the maximum stress increased by 6.3% and 10.5% in the bone integrity and bone loss models, respectively. Moreover, the marginal bone loss models had the greatest impact on the implant fixture, with a maximum stress increase of 51.8% on average. Evidently, the influence of bone loss might be far greater than that of the aftermarket screw; however, any factor could be enough to cause clinical failure. Therefore, we should pay more attention to the maintenance of the long-term peri-implant marginal bone integrity.
种植体周围的骨吸收相当常见，并且计算机辅助设计与计算机辅助制造（CAD/CAM）技术的成熟和普及使得售后基台螺钉的使用更加广泛。本研究旨在通过三维有限元分析（3D FEA）探讨这两个常见因素对种植体系统内部应力的生物力学影响。有限元分析结果表明，在相同加载条件下，在种植体系统的三个组件中，使用售后螺钉对螺钉本身的影响最大，而在骨完整性和骨丢失模型中，最大应力分别增加了6.3%和10.5%。此外，边缘骨丢失模型对种植体基台的影响最大，平均最大应力增加51.8%。显然，骨丢失的影响可能远大于售后螺钉；然而，任何一个因素都可能足以导致临床失败。因此，我们应更加关注长期种植体周围边缘骨完整性的维持。
