Pattijn V, Van Lierde C, Van der Perre G, Naert I, Vander Sloten J
K.U.Leuven, Faculty of Engineering, Division of Biomechanics and Engineering Design, Celestijnenlaan 200A, B-3001 Leuven, Belgium.
J Biomech. 2006;39(5):939-47. doi: 10.1016/j.jbiomech.2005.01.035.
The purpose of this study was to evaluate the modal behaviour of the bone-implant-transducer (Osstell) system by means of finite element analyses. The influence of different parameters was determined: (1) the type of implant anchorage being trabecular, cortical, uni-cortical, or bi-cortical, (2) the implant diameter, (3) the length of the implant embedded in the bone, and (4) the bone stiffness. The type of anchorage determines the resulting modal behaviour of the implant-transducer system. A rigid body behaviour was found for a uni-cortical anchoring and for a homogeneous anchoring with low bone stiffness (< or =1000 MPa), whereas a bending behaviour was found for a homogeneous anchoring with a high bone stiffness (> or =5000 MPa) and for a bi-cortical anchorage. The implant dimensions influence the values for the resonance frequencies. Generally, an increase in implant diameter or implant length (in bone) results in higher resonance frequencies. This study also showed that resonance frequencies in case of rigid body behaviour of the implant-transducer system are more sensitive to changes in bone stiffness than resonance frequencies in case of bending behaviour. In conclusion, it seems that the Osstell transducer is suited for the follow-up in time of the stability of an implant, but not for the quantitative comparison of the stability of implants.
本研究的目的是通过有限元分析评估骨-种植体-传感器（Osstell）系统的模态行为。确定了不同参数的影响：（1）种植体锚固类型，即小梁骨、皮质骨、单皮质或双皮质；（2）种植体直径；（3）植入骨内的种植体长度；（4）骨刚度。锚固类型决定了种植体-传感器系统的最终模态行为。单皮质锚固以及骨刚度较低（≤1000 MPa）的均匀锚固呈现刚体行为，而骨刚度较高（≥5000 MPa）的均匀锚固以及双皮质锚固则呈现弯曲行为。种植体尺寸会影响共振频率值。一般来说，种植体直径或（在骨内的）种植体长度增加会导致共振频率升高。本研究还表明，与弯曲行为情况下的共振频率相比，种植体-传感器系统呈现刚体行为时的共振频率对骨刚度变化更为敏感。总之，似乎Osstell传感器适用于对种植体稳定性进行实时随访，但不适用于对种植体稳定性进行定量比较。
