目的：研究不同载荷方向下游离端附着体义齿基牙牙周及粘膜的应力．方法：应用三维有限元应力分析方法．结果：①近缺隙基牙承担主要牙合力；②基托的大小对基牙牙周应力产生影响，颊向加载时基牙应力小于舌向加载；③牙合力偏向近中，牙槽嵴顶牙周应力分布较好，偏向远中应力最大（最大值３８２ＭＰａ），颊舌向次之，但也远大于垂直加载（最大值２３１ＭＰａ）．结论：制作游离端附着体义齿时应尽量减少侧向及远中向牙合力，尽量增大基托面积 Objective: To study the stress of periodontal and mucosal abutments of free-end attachment denture under different loading directions. Methods: Three-dimensional finite element stress analysis method was used. Results: (1) The near-gap abutment bear the main force; (2) the size of the abutment has an effect on the periodontal stress of the abutment; the stress of the abutment is less than that of the tongue when loaded; (3) The distribution of periodontal stress is good, with the maximum stress at the far point (maximum of 382 MPa) and the bucco-lingual second, but also much larger than the vertical loading (maximum of 231 MPa). Conclusion: When making the free end attachment denture, the lateral and distal mid-point force should be minimized to maximize the base area