Cailleteau J G, Rieger M R, Akin J E
Department of Oral Health Practice, Endodontic Section, University of Kentucky, College of Dentistry, Lexington.
J Endod. 1992 Nov;18(11):540-4. doi: 10.1016/S0099-2399(06)81210-0.
The finite element method was used to compare stresses along the inner canal wall in four two-dimensional models of an average maxillary central incisor. The four models evaluated were an intact incisor, an endodontically treated incisor, an endodontically treated crown-restored incisor, and a cylindrical post and crown-restored incisor. A horizontal static force, 1 Newton in magnitude, was applied to the lingual surface of each model and the maximum tensile, compressive, and shear stresses were calculated using the general purpose finite element program PAFEC 75. Results indicate that the stress patterns within the root are altered as a result of post insertion. Specifically, the maximum bending stresses are associated with the apical termination of the post, and post placement does not result in a uniform distribution of stress along the canal wall.
采用有限元方法，在四个平均上颌中切牙的二维模型中比较沿根管内壁的应力。所评估的四个模型分别为完整切牙、根管治疗后的切牙、根管治疗后冠修复的切牙以及圆柱桩和冠修复的切牙。对每个模型的舌面施加大小为1牛顿的水平静力，并使用通用有限元程序PAFEC 75计算最大拉应力、压应力和剪应力。结果表明，桩的植入改变了牙根内的应力模式。具体而言，最大弯曲应力与桩的根尖末端相关，并且桩的放置不会导致沿根管壁的应力均匀分布。
