上颌后牙种植固定桥修复连续缺失牙的三维有限元分析
摘要
目的: 通过三维有限元分析法(FEA,Finite Element Analysis)对上颌后牙两颗种植固定修复三单位连续缺失牙的应力分布进行分析,比较种植体位于缺失两端位置对缺失牙进行连桥修复及种植体位于远中一侧对缺失牙进行单端桥修复时的应力分布有何不同。 方法: 使用 Abaqus6.14 建立上颌后牙区牙槽骨骨块简化模型,牙槽骨高度为14mm,近远中长度为 27mm,分别建立模型 A 即上颌第二前磨牙与上颌第二磨牙种植连桥修复上颌第一磨牙缺失及模型 B 建立上颌第一磨牙与第二磨牙种植单端桥修复上颌第二前磨牙的模型。在常规负载条件下,按 6:10:9 施加垂直向载荷,分别计算其应力分布、骨皮质、骨松质最大 von Mises 应力。 结果: 模型 A 的骨皮质最大 von Mises 应力分布于远中种植体的颈部,模型 B 的骨皮质最大 von Mises 应力分布于近中种植体的颈部;模型 A 的骨皮质最大 von Mises 应力均小于模型 B 的最大 von Mises 应力,差异具有统计学意义。结论: 模型 A 即上颌第二前磨牙与上颌第二磨牙种植连桥修复上颌第一磨牙缺失的修复方案的应力分布较模型 B 即上颌第一磨牙与第二磨牙种植单端桥修复上颌第二前磨牙的修复方案更有利于应力分布。
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DOI: http://dx.doi.org/10.26549/yzlcyxzz.v3i4.4419
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