眶部骨密度对种植体-骨界面应力影响的三维有限元研究

The effects of orbital bone density on the stress distribution of implant-bone surface: A 3D finite element study

目的：探讨眶部受植区不同骨密度对种植体骨界面应力分布的影响。方法：建立8个不同HU值（300~10 000）骨密度的眶部种植体-颅颌面骨三维有限元模型,给予沿种植体轴向20 N的载荷,记录Von-Mises应力峰值和位移峰值,分析其应力分布。结果：随着骨密度值增高,应力峰值和位移峰值均出现下降,在800~1 000 HU条件下,应力峰值和位移峰值下降不明显。结论：眶部受植区骨密度小于800 HU时,骨密度对种植体的成功率有直接影响。

Objective： To observe the effects of orbital bone density on the stress distribution of implant-bone surface. Methods：The 3D finite element analysis craniofacial model with eight HU values（ 300- 10 000） was established. A force of 20 N along the implant axis was applied on the model. The stress values and distribution were calculated and analyzed. Results： The peak of stress value and displacement discreased as HU value increased. In the range of HU value 800- 1 000 HU,the peak of stress value and displacement of bone interface did not significantly change with the increasing of HU value. Conclusion： Orbital bone density is an important factor on orbital implant failure when HU value below 800.