不同弹性模量的基台-种植体组合对周围成骨性能的影响

利用有限元分析软件计算了不同静力作用下的多种基台-种植体周围骨组织的应力分布.模拟结果显示, 基台-种植体组合中Ti6Al4V钛合金-聚醚醚酮(TC4-PEEK)相对于其他实验组其应力集中程度现象可以有效降低, 周围骨组织的应力分布较为均匀, 最大应力值为40~60 MPa.在轴向加载条件下, 不同基台-种植体系统中PEEK种植体的应力水平较小, 而周围骨组织应力水平较大; 在斜向45°加载条件下, 相对于其他两种基台-种植体系统, TC4-PEEK的应力水平更低, 其周围骨组织中的皮质骨承受的最大应力值为55 MPa, 松质骨承受的最大应力值为5 MPa, 综合来看的应力水平最小, 有助于骨沉积和成骨量增加, 从而有效提高种植体的界面稳定性. 

Effects of abutment-implant combinations with different elastic moduli on osteogenic performance

Many factors affect the success of dental implant surgery, such as surgical trauma, excessive chewing pressure, material performance mismatch, and improper abutment-implant connection. Among these factors, stress shielding caused by the mismatch of elastic modulus of the material is a major problem affecting the biomechanical compatibility of the implant. Also, the elastic modulus of the dental implant directly affects its binding to the surrounding support bone and stress distribution. Presently, most of the abutmentimplant systems on the market use the same material, with TC4 being popular because of its good biocompatibility. However, the elastic modulus of titanium implants is quite different from that of surrounding bone tissue; this difference can cause stress shielding. Additionally, stress concentration may cause implant surgery to fail. The abutment-implant with materials of different elastic modulus directly affect the stability and stress distribution of the bone tissue around the implant; thus, understanding the stress distribution under loading will help to establish a better elastic modulus combination of the dental implant system. In this paper, finite element analysis software was used to calculate the stress distribution of various abutments-implants under different loading conditions. Compared to other experimental abutment-implant systems, the simulation results show that Ti6Al4V abutment-(poly-ether-ether-ketone) (TC4-PEEK) can effectively reduce stress concentration, resulting in uniform stress distribution of surrounding bone tissue whose maximum stress value is 40-60 MPa. The stress level of PEEK implants in different abutment-implant systems is smaller under axial loading condition, whereas the stress level of surrounding bone tissue is larger. In the oblique direction of 45° loading condition, compared to two other abutment-implant systems, the stress level of the TC4-PEEK is lower, and the maximum stress value of the cortical and the cancellous bones in the surrounding bone tissue is 55 and 5 MPa, respectively, and the stress level is the smallest; such conditions contribute to the increase of bone deposition and bone formation, effectively improving the interface stability of the implant.