Abstract：
The current study evaluated the stress distribution in a maxillary central incisor with mid-root fracture after splinting with different intra-radicular posts using 3D-finite element analysis (FEA). Five 3D-FEA models were constructed. Model 1 was an intact tooth with no fracture, Model 2: A tooth with a horizontal mid-root fracture, with no treatment. Model 3: Same as model 2, and intraradicular splinting using fiber post. Model 4: Same as model 2 and intra-radicular splinting using Protaper Gold file F3. Model 5: Same as model 2, and with intraradicular splinting with Ribbond. The FEA of all models was done to obtain the maximum Von-Mises stress in the root canal space, the dentin, the periodontal ligament, and the bone. The highest Von Mises stresses for the root canal space and the dentin were found in Model 3, followed by models 4, 5, and 2, and least in Model 1. The Von Mises stress of the periodontal ligament was the least in model 1. The Von Mises stress of bone was higher in all experimental models than in the baseline model. The results suggest that in cases where intra-radicular splinting is indicated, fiber posts and Ribbond are better alternatives to endodontic files due to the lower stresses exerted.
摘要：
当前的研究使用3D有限元分析（FEA）评估了使用不同的神经根内支柱进行夹板固定后上颌中切牙中根骨折的应力分布。构建了五个3D-FEA模型。模型1是完整的牙齿，没有骨折，模型2：一颗有水平中根骨折的牙齿，没有治疗。模型3：与模型2相同，并且使用纤维桩进行针内夹板。模型4：与模型2和使用ProtaperGold文件F3的神经根内夹板相同。模型5：与模型2相同，并带有带肋的针内夹板。所有模型的有限元分析都是为了获得根管空间中的最大Von-Mises应力，牙本质,牙周膜，还有骨头.在模型3中发现了根管空间和牙本质的最高VonMises应力，其次是模型4、5和2，在模型1中最小。模型1中牙周膜的VonMises应力最小。在所有实验模型中，骨骼的VonMises应力均高于基线模型。结果表明，在需要使用根内夹板的情况下，由于施加的应力较低，纤维桩和Ribbond是牙髓文件的更好替代品。
