附着体应用于单侧上颌骨缺损修复的三维有限元分析

目的:对附着体应用于单侧上颌骨缺损修复进行三维有限元力学分析。方法:利用已有的单侧上颌骨缺损的三维有限元模型,在ANSYS程序中分别设计并建立附着体支架,修复两种不同上颌骨缺损情况的模型(附着体位于中切牙或尖牙近中面),进行三维有限元力学分析。结果:应力集中区均位于健侧腭部基托的近前牙区,健侧后牙受力均匀;附着体位于中切牙近中时,中切牙近中面应力值为1.306MPa,附着体与舌面导板的连接处应力较集中;附着体位于尖牙近中时,尖牙近中面应力值为0.797MPa,应力集中区位于舌面导板的前下方转角区。结论:附着体应用于单侧上颌骨缺损修复,符合生物力学要求,未增加基牙的负荷。对附着体支架的设计,应作进一步研究。

Three-dimensional finite analysis of the application of attachment for restoration of unilateral maxillary defect

PURPOSE: To study the stress of the application of attachment for restoration of unilateral maxillary defect. METHODS: Using the 3-D FE model of the unilateral maxillary defect, two different 3-D FE models of the application of attachment framework for restoration of different unilateral maxillary defects (attachment on the mesial side of the central incisor or canine)were designed and established. RESULTS: The area of stress concentration of the two prostheses were on the palatal base near the position of the anterior teeth . the stress was on the posterior teeth of the healthy side. When the attachment was on the mesial side of the central incisor, the stress of the mesial surface of the central incisor was 1.306MPa,and the stress concentration was at the junction of the attachment and the lingual guide plane. When the attachment was on the mesial of the canine, the stress of the mesial surface of the canine was 0.797MPa, and stress concentration was at the corner of the front and bottom of the lingual guide plane. CONCLUSIONS: The application of attachment for restoration of unilateral maxillary defect meets the biomechanical demands without increasing the stress load on the abutment. And further study of the design of the attachment framework should be done. Supported by Research Fund of Shanghai Municipal Education Commission(Grant No.04BC40) and Shanghai Leading Academic Discipline Project (Grant No.T0202).