以下为句子列表：
英文: METHODS: Based on the 3-D FEA database of RPD, the stress state of the abutment and its periodontal tissue was analyzed to choose the optimal retainer with the same situation of dentural defect.
中文: 方法：对个别牙缺失的病例设计不同固位体，在可摘局部义齿三维有限元模型库的基础上组建实验模型，通过三维有限元方法，分析牙周组织在不同情况下所受的应力大小。
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英文: PURPOSE: To study the stress of the abutment and its periodontal tissue with different designs of retainer (type of retainer, place) in the same situation of dentural defect.
中文: 摘要目的：探讨在相同的缺牙病例中，不同的固位体设计（固位体的类型、放置的位置）对牙颌组织的力学影响。
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