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目的建立下颌KennedyⅠ类可摘局部义齿的三维有限元模型,为其设计提供生物力学基础。方法在2008年6月山东大学附属千佛山医院口腔科常规体检人群中选取1名男性志愿者,年龄55岁,下颌双侧后牙游离缺失,余留前牙无拥挤,咬合关系正常。通过螺旋CT扫描与计算机辅助设计(CAD)技术及Unigraphics、MSC.MARC软件结合的方法,建立下颌KennedyⅠ类可摘局部义齿的三维有限元模型。结果建成双侧后牙游离缺失的下颌骨及其可摘局部义齿的三维有限元模型,共有单元36968个,节点9553个,模型可以根据需要任意进行旋转和缩放。结论 CT扫描与CAD技术联合应用建立双侧后牙游离缺失的下颌骨及其可摘局部义齿三维有限元模型的方法切实可行。
Objective To establish a three-dimensional finite element model of mandible Kennedy Ⅰ removable partial dentures, and provide biomechanical basis for its design. Methods One male volunteer, aged 55 years, was selected from the routine medical examination of the department of Stomatology in Qianfoshan Hospital affiliated to Shandong University in June 2008. The mandibular bilateral posterior teeth were free and disappeared. The remaining anterior teeth were not crowded and the occlusion was normal. A three-dimensional finite element model of mandibular Kennedy class I removable partial dentures was established by means of the combination of spiral CT scan with computer-aided design (CAD) technology and Unigraphics, MSC.MARC software. Results A three-dimensional finite element model of the mandible with removable missing teeth and its removable partial dentures with a total of 36,968 elements and 9553 nodes was constructed. The model can be rotated and scaled arbitrarily according to the needs. Conclusion The combination of CT scanning and CAD technique is feasible and practicable to establish the 3D finite element model of the mandible and its removable partial dentures.