微种植体支抗在内收上颌前牙过程中其植入角度和长度连续变化的三维有限元分析

发布时间：2018-04-29 17:59

本文选题：微种植体 + 上颌前牙　；参考：《中国体视学与图像分析》2017年01期

【摘要】：目的通过建立微种植体-上颌骨-上颌牙列-直丝弓矫治器的三维有限元模型,探讨微种植体在内收上颌前牙过程中植入角度和长度连续变化对微种植体-骨界面的应力分布影响,为临床微种植体植入角度和长度的选择提供理论依据。方法选取临床样本一例,采用锥体束CT(CBCT)进行扫描,得到上颌骨及上颌牙列的原始数据,运用三维重建软件,建立出具有较高几何相似性、结构完整的三维有限元模型,将微种植体的植入长度设定为7 mm、7.5 mm、8 mm、8.5 mm、9 mm,植入角度设定为45°、60°、75°、90°。运用有限元分析软件分析当载荷为200 g(1.96 N)时,微种植体及周围骨皮质骨松质的范·米塞斯(Von-Mises)应力分布。结果在不同的植入角度下,当微种植体的植入长度基本为8.5 mm时,其所受Von-Mises应力最小;当微种植体的植入长度不同时,其Von-Mises应力值最小的植入角度为75°。结论当微种植体的载荷为200 g时,微种植体支抗内收上颌前牙的最佳植入长度为8.5 mm,最佳植入角度为75°。
[Abstract]:Objective to establish a three-dimensional finite element model of microimplant-maxillary maxillary dentition and straight wire appliance. To investigate the effect of continuous changes of implant angle and length on the stress distribution at the interface of microimplant and bone during the process of maxillary anterior tooth retraction with microimplants, and to provide a theoretical basis for the selection of the angle and length of microimplant implantation. Methods A case of clinical sample was selected and the original data of maxilla and maxillary dentition were obtained by using Cone bundle CT (CBCTT). The 3D finite element model with high geometric similarity and complete structure was established by using 3D reconstruction software. The implant length was 7 mm / 7.5 mm / 8 mm and 8.5 mm / 9 mm, and the implantation angle was 45 掳/ 60 掳/ 75 掳/ 90 掳. Finite element analysis software was used to analyze the Von Misesus stress distribution in the cancellous bone of the microimplant and the surrounding cortical bone when the load was 200 g / 1.96 N. Results at different implantation angles, the Von-Mises stress was the least when the implant length was 8.5 mm, and the minimum Von-Mises stress value was 75 掳when the implant length was different. Conclusion when the load of microimplant is 200 g, the best implant length and angle are 8.5 mm and 75 掳respectively.
【作者单位】：佳木斯大学口腔医学院;
【基金】：佳木斯大学研究生科技创新项目(No.YZ2016-035)
【分类号】：R783.6

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