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对桩重建牙(钉核冠)的应力状况,用有限元法分析已证明,在具有正常骨支持的牙齿中,粗长的圆柱体桩产生的牙本质应力比尖端锥形的桩或较细的桩为小;但是,当骨支持减少时,主应力和剪应力集中于环绕桩尖的余留牙本质上。这就产生了使牙根折断的可能性。本研究是确定在伴有牙周支持减少的桩重建牙中,使用尖端锥形桩对改变牙本质应力和增加余留牙本质厚度的作用,着重观察桩尖附近牙本质中的最大主应力和剪应力。
Stress analysis of the reconstructed tooth (nail crowns) of the pile, using finite element analysis, has shown that in a tooth with normal bone support, a long cylindrical pile produces a dentin stress that is less than that of a tip-tapered pile or thinner Of the piles are small; however, as the bone support decreases, the principal stress and shear stress are concentrated on the residual dentine surrounding the tip of the pile. This creates the possibility of breaking the root. This study was designed to determine the effect of tip conical piles on changing dentin stress and increasing residual dentin thickness in reconstructive dentures with reduced periodontal support, with a focus on the maximal principal stress and shear stress in the dentine near the tip of the pile .