Department for Cranio-Maxillo-Facial and Plastic Surgery, University Hospital Giessen, Klinikstr. 33, 35385 Giessen, Germany.
J Dent Res. 2012 Dec;91(12):1184-9. doi: 10.1177/0022034512463396. Epub 2012 Oct 8.
Micro-gaps and osseous overload in the implant-abutment connection are the most common causes of peri-implant bone resorption and implant failure. These undesirable events can be visualized on standardized three-dimensional finite element models and by radiographic methods. The present study investigated the influence of 7 available implant systems (Ankylos, Astra, Bego, Brånemark, Camlog, Straumann, and Xive) with different implant-abutment connections on bone overload and the appearance of micro-gaps in vitro. The individual geometries of the implants were transferred to three-dimensional finite element models. In a non-linear analysis considering the pre-loading of the occlusion screw, friction between the implant and abutment, the influence of the cone angle on bone strain, and the appearance of micro-gaps were determined. Increased bone strains were correlated with small (< 15°) cone angles. Conical implant-abutment connections efficiently avoided micro-gaps but had a negative effect on peri-implant bone strain. Bone strain was reduced in implants with greater wall thickness (Ankylos) or a smaller cone angle (Bego). The results of our in silico study provide a solid basis for the reduction of peri-implant bone strain and micro-gaps in the implant-abutment connection to improve long-term stability.
种植体-基台连接部位的微间隙和骨过度负载是导致种植体周围骨吸收和种植体失败的最常见原因。这些不良事件可以在标准化的三维有限元模型和放射学方法中观察到。本研究通过体外实验，调查了 7 种不同种植体-基台连接系统（Ankylos、Astra、Bego、Brånemark、Camlog、Straumann 和 Xive）对骨过载和微间隙形成的影响。将各个种植体的几何形状转移到三维有限元模型中。在考虑咬合螺钉预加载、种植体与基台之间摩擦、锥度角对骨应变的影响以及微间隙形成的非线性分析中，确定了这些因素。骨应变的增加与小（<15°）锥角相关。锥形种植体-基台连接有效地避免了微间隙，但对种植体周围骨的应变有负面影响。具有较大壁厚（Ankylos）或较小锥角（Bego）的种植体可减少骨应变。我们的计算机模拟研究结果为减少种植体-基台连接部位的骨应变和微间隙提供了坚实的基础，从而提高长期稳定性。
