口腔种植体-基台微间隙充填对种植修复系统及周围骨力学的影响

目的:探讨口腔种植体-基台微间隙充填对种植修复系统及周围骨力学的影响.方法:建立第一磨牙缺失的下颌骨有限元模型,模拟植入1颗Straumann种植体.建立对不同大小种植体-基台微间隙(5、6、7、8、9μm)胶质充填后的种植系统模型,于面垂直向加载100 N咬合力和斜向45°加载100 N咬合力,分析种植体系统各部件...

The effect of oral implant-abutment microgaps closed by sealing materials on implant-supported prosthesis,surrounding bone

PURPOSE: To investigate the stress and stress distribution generated on each component of dental implant system and surrounding bone when using sealing materials to close the implant-abutment microgaps. METHODS: A finite element model of partial mandible without first molar was set up, and a dental implant (Straumann) was placed. The implant system models were established with different sizes of implant-abutment microgaps (5, 6, 7, 8, 9 μm), which were closed by sealing materials. The loading forces were 100 N axially (0°) and 100 N obliquely (45°) respectively on occlusive surface. Finite element analysis was performed by computer. RESULTS: The stress on the whole prosthesis and the abutment was almost unchanged whether the implant-abutment microgap was filled or not. When the microgap was closed, the equivalent stress on the implant decreased slightly, and the equivalent stress on the surrounding bone decreased significantly. The stress on the whole prosthesis increased with the increase of the microgaps. CONCLUSIONS: Using sealing materials to close the implant-abutment microgaps could effectively reduce the stress on the implant and mandible, which may have some practical value.