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为了探讨人工种植牙的数目、上部结构对种植牙周骨界面应力分布的影响，本实验应用三维有限元分析方法，对二单位和四单位式杆式覆盖种植义齿种植牙周骨界面的应力分布规律进行了探讨。结果表明：最大压应力、最大拉应力二单位式与四单位式均位于颈周密质骨，二单位式大于四单位式，两者有显著差异性，（Ｐ＜０．００１）。四单位式最大拉、压应力，远中种植牙要大于近中种植牙。最大位移运动二单位式小于四单位式，四单位式近中种植牙大于远中种植牙。二单位式与四单位式位、压应力主要集中于颈部，其它部位与颈部相比有非常显著的差异性，（Ｐ＜０．０００１）。结论：种植牙数目的增加，可以减小种植牙周颈部密质骨内的最大应力值。四单位式种植义齿颈周骨内应力要小于二单位式种植牙，从这点上看，四单位式种植义齿要优于二单位式种植义齿。多个种植牙种植时，杆的连接，改变了种植牙周骨内的应力分布规律，其应力主要由种植牙颈周密质骨来承担
In order to investigate the effect of the number of artificial implants and the superstructure on the stress distribution in the periodontal bone interface, the stress distribution of the two-unit and four-unit rod-covered implant during periodontal bone interface implanting was studied by three-dimensional finite element analysis The law was discussed. The results show that the maximal compressive stress and the maximum tensile stress are both located in the cortical bone around the neck and the two units are more than four units, both of which are significantly different (P <0.001). Four-unit maximum pull, compressive stress, distal implant teeth to be greater than near the implant teeth. The maximum displacement of two units of movement less than four units, four units near the middle of planting teeth larger than the planting teeth. Two unit type and four unit type position, compressive stress mainly concentrated in the neck, other parts compared with the neck has a very significant difference (P <0.0001). Conclusion: The increase of the number of dental implants can reduce the maximal stress in the periodontal neck and crooked bone. Four-unit implant denture neck circumference of bone stress is less than two unit-type implant, from this point of view, four-unit implant denture is superior to two unit-type implant denture. When implanting multiple dental implants, the connection of the rods changes the stress distribution in the periodontal bone. The stress is mainly borne by the planting of the periosteum