以下为句子列表：
英文: PURPOSE: To study the stress variation and distribution of the periodontium and the tooth initial displacement when the lingual fixate forces were applied to the depressed periodontal height.
中文: 摘要目的：研究牙周支持高度降低状态下施加舌向集中力时，牙周组织的应力变化、分布规律和牙的初始位移。
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