Dérand T
J Dent Res. 1977 Dec;56(12):1463-7. doi: 10.1177/00220345770560120401.
The principal stress distribution in a root with a loaded post was analyzed in model experiments, in which emphasis was directed to the cervical boundary of the root where the stresses are greatest. Maximum stresses were found in the inner proximal sides, and were stronger when the prepared root canal walls were parallel. When contact between post and root was reduced, stresses decreased. These findings point to the importance of sparing tooth substance in the proximal parts of the canal in order to reduce the risk of breaking the cement layer and loosening the post.
在模型实验中分析了带有负载桩的牙根中的主应力分布，其中重点关注牙根的颈部边界，此处应力最大。最大应力出现在近中内侧，当预备的根管壁平行时应力更强。当桩与牙根之间的接触减少时，应力降低。这些发现表明在根管近中部分保留牙体组织以降低破坏粘固层和使桩松动风险的重要性。
