摘要
目的:在研究牙种植体植入下颌骨的三维有限元分析中,采用精确完整的下颌骨模型可获得可靠的结果,但是耗时耗力,且可能导致计算得不到收敛而失败,因此须在保证计算结果精度的前提下对模型进行简化。方法:本文基于CT数据,采用轮廓延伸法分别建立了切牙位、尖牙位、第二前磨牙位和第二磨牙位简化下颌骨模型,进行了三维有限元分析,其结果与这四种牙位下采用精确模型的计算结果进行了比较,对简化模型的适用性进行评价。结果:应力分布云图与应力分布路径图结果显示,采用简化模型与精确模型植入体周围骨应力分布特征相似,但是随着植入牙位远离精确部位约束部位,植入体周围骨应力最大值、植入体/骨界面应力分布与精确模型相比偏差越大,第二前磨牙位和第二磨牙位最大应力值偏差相对较小,为17%和21%,而切牙位为37%,尖牙位为58%。结论:因此,在对计算精度要求不高的情况下,第二前磨牙位和第二磨牙位采用简化模型是可行的,而切牙位和尖牙位则不适于采用简化模型。
Objective：In the research of biomechanical behavior of dental implant by way of 3D finite element analysis （FEA）, reliable results would be attained under accurate mandible model. But the construction of model would cost multiple of time and energy, and sometime would result in failure due to convergence unavailable. So it is necessary to simplify model without the affecting of the precision of result. Methods： This study built four simplified mandible model at implant position of incisor, tusk, second front molar and second molar by way of extension of configuration from CT image. Comparison of the result with accurate model at the four cases was made to evaluate the feasibility of simplified model. Results： Contour plots and path plots of the stress of bone around implant showed the similarity of stress distribution for the two models. But with the increasing of distance from the displacement of mandible, the difference of stress peak and stress distribution for the two models increased. The deviation of maximal stress at position of second front molar and second molar was 17% and 21% respectively, which was relatively small. At the position of incisor and tusk , the deviation was 37% and 58% respectively. Conclusion：Therefore, without the strict restriction of model accuracy, it is viable to adopt simplified model at site of second front molar and second molar, while not applicable at site of incisor and tusk.
出处
《中国口腔种植学杂志》
2006年第1期5-8,F0002,共5页
Chinese Journal of Oral Implantology
关键词
牙种植体
下颌骨
三维有限元分析
应力分布
dental implant
3D finite element analysis （3D FEA）
mandible
stress distribution
