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背景:为了尽量避免种植义齿修复时出现种植体周围骨组织应力集中。以往有研究应用增大种植体与骨界面的结合面积、增加直径、增加长度等方法以期使种植体骨界面应力分布更趋均匀,以提供更大的支持力,但观察时间较短,且临床报告并不一致。目的:设计不同冠根比种植修复体,采用三维有限元法,对轴向加载和颊舌向加载下的不同冠根比种植修复体周围骨组织应力分布进行分析,以求找到适合临床种植修复的冠根比范围。方法:应用CT断层扫描技术得到下颌骨和下颌牙列的大致轮廓,通过交互式的医学影像控制系统对图形特征进行整体图像拟合,再以计算机软件生成云图,根据云图的数据进行三维重建,从而得到包括下颌骨和下颌牙列的三维有限元模型;运用几何模型方法建立不同冠根比种植修复下颌第一磨牙的三维模型。运用Hyperwork8.0及Ansys11.0大型有限元分析软件,建立下颌不同冠根比的种植修复体模型,并完成牙冠的修复。在模拟向载荷的基础上,比较不同冠根比种植修复体周围骨组织应力分布状况。结果与结论:获得了下颌骨及下颌牙列的三维有限元模型,以及下颌不同冠根比种植修复体的有限元模型。通过对不同冠根比种植体施加轴向100N及颊舌向50N的力,种植体周围骨组织产生的应力分布状况比较发现,颊舌向受力下种植体颈部及周围骨皮质为应力集中区;轴向施力时种植体颈部、根尖部周围的骨组织为应力集中区。
Background: In order to avoid the stress concentration of the bone tissue around the implant when the implant denture is repaired. In the past, research has been done to increase the bond area between the implant and the bone interface, increase the diameter and increase the length of the implant so as to make the stress distribution on the implant bone interface more uniform and provide greater support, but the observation time is short and the clinical The report is not consistent. OBJECTIVE: To design different crown-root-ratio implant prostheses, analyze the stress distribution of bone tissue around implant prosthesis under axial loading and bucco-lingual loading with three-dimensional finite element method, in order to find suitable for clinical implant restoration Crown root ratio range. Methods: The general outline of the mandibular and mandibular dentition was obtained by CT tomography. The whole image was fitted by the interactive medical imaging control system. Then the cloud image was generated by computer software, and the 3D reconstruction was performed according to the cloud image data. The three-dimensional finite element model of the mandibular first molar was established. The geometric model was used to establish the three-dimensional model of the mandibular first molar. The HyperWorks8.0 and Ansys11.0 large-scale finite element analysis software were used to establish the implants model of mandibular crowns with different mandibular root ratios and to complete the restoration of the crown. On the basis of simulating the directional load, the stress distribution of bone around peri-implant prosthesis was compared. RESULTS AND CONCLUSION: Three-dimensional finite element models of the mandibular and mandibular dentition as well as the finite element model of mandibular different root-and-crown implant prosthesis were obtained. By comparing the stress distribution in the bone tissue around the implant with 100N axial force and 50N bucco-lingual implant, the stress distribution in the cervical and surrounding cortical bone under the buccolingual tongue stress was compared Area; axial force implants neck, apical bone tissue around the stress concentration area.