Shinya Akikazu, Ballo Ahmed M, Lassila Lippo V J, Shinya Akiyoshi, Närhi Timo O, Vallittu Pekka K
Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, Turku, Finland.
J Oral Implantol. 2011 Mar;37 Spec No:133-40. doi: 10.1563/AAID-JOI-D-09-00046. Epub 2010 Jun 14.
This study analyzed stress and strain mediated by 2 different implant materials, titanium (Ti) and experimental fiber-reinforced composite (FRC), on the implant and on the bone tissue surrounding the implant. Three-dimensional finite element models constructed from a mandibular bone and an implant were subjected to a load of 50 N in vertical and horizontal directions. Postprocessing files allowed the calculation of stress and strain within the implant materials and stresses at the bone-to-implant interface (stress path). Maximum stress concentrations were located around the implant on the rim of the cortical bone in both implant materials; Ti and overall stresses decreased toward the Ti implant apex. In the FRC implant, a stress value of 0.6 to 2.0 MPa was detected not only on the screw threads but also on the implant surface between the threads. Clear differences were observed in the strain distribution between the materials. Based on the results, the vertical load stress range of the FRC implant was close to the stress level for optimal bone growth. Furthermore, the stress at the bone around the FRC implant was more evenly distributed than that with Ti implant.
本研究分析了两种不同种植体材料（钛（Ti）和实验性纤维增强复合材料（FRC））在种植体及其周围骨组织上介导的应力和应变。由下颌骨和种植体构建的三维有限元模型在垂直和水平方向上承受50 N的载荷。后处理文件允许计算种植体材料内的应力和应变以及骨 - 种植体界面处的应力（应力路径）。两种种植体材料在皮质骨边缘的种植体周围均出现最大应力集中；钛种植体的整体应力朝着种植体根尖方向降低。在FRC种植体中，不仅在螺纹上而且在螺纹之间的种植体表面检测到0.6至2.0 MPa的应力值。两种材料之间的应变分布存在明显差异。基于这些结果，FRC种植体的垂直载荷应力范围接近最佳骨生长的应力水平。此外，FRC种植体周围骨的应力分布比钛种植体更均匀。
