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附着体桩柱形态的设计不仅影响到桩柱固位，而且影响牙本质应力分布。本研究用三维有限元法分析临床常见的６种桩柱形态设计对牙本质应力分布的影响。结果表明：锥形桩柱设计对牙本质有楔的作用，其应力值明显高于平行桩柱，为平行桩的１．１倍；螺纹桩柱设计，牙本质最大应力值是非螺纹桩柱的１．０６倍。然而，桩柱形态设计对牙本质应力分布的影响明显小于载荷作用方向对牙本质应力分布的影响。４５度斜向载荷作用下，相同设计的桩柱其牙本质最大应力值是垂直载荷作用下牙本质最大应力值的２．１倍。因此，临床修复设计中，减小侧方咬合力是预防牙本质折裂的主要手段。
The design of the attachment pillars not only affects the pile retention, but also affects the dentin stress distribution. In this study, three-dimensional finite element method analysis of clinical common six kinds of pillars design on dentin stress distribution. The results show that the taper column design has the effect of wedging the dentin and the stress value is obviously higher than that of parallel piles, which is 1.1 times of that of parallel piles. The design of threaded pillars and the maximal stress value of dentin are non-threaded piles 1.06 times. However, the effect of pile form design on dentinal stress distribution is significantly less than that of denture stress distribution. Under 45 degree inclined load, the maximal dentin stress of the same designed piles is 2.1 times of the maximal stress of dentin under the vertical load. Therefore, the clinical repair design, to reduce lateral occlusal force is to prevent the main means of dentin fracture.