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Finite element analysis of multi-piece post-crown restoration using different types of adhesives

机译:使用不同类型的粘合剂进行多件式冠后修复的有限元分析

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摘要

The multi-piece post-crown technique is more effective in restoring residual root than other restoration techniques. Various types of adhesives have different material properties that affect restoration. Therefore, the choice of adhesive is particularly important for patients. However, the effect of different kinds of adhesives was not too precise by experimental methods when concerning about individual differences of teeth. One tooth root can only be restored with one type of adhesive in experiment. After the mechanical test, this tooth root cannot be restored with other adhesives. With the help of medical imaging technology, reverse engineering and finite element analysis, a molar model can be reconstructed precisely and restored using different types of adhesives. The same occlusal and chewing loads were exerted on the same restored residual root models with different types of adhesives separately. Results of von Mises stress analysis showed that the adhesives with low Young's modulus can protect the root canal effectively. However, a root canal concentration is apparently produced around the root canal orifice when chewing. Adhesives with large Young's modulus can buffer the stress concentration of the root canal orifice. However, the root canal tissue may be destroyed because the adhesive is too hard to buffer the load.
机译:与其他修复技术相比,多件式后冠技术在修复残留根方面更有效。各种类型的粘合剂具有影响修复的不同材料属性。因此,粘合剂的选择对患者尤为重要。然而,当考虑牙齿的个体差异时,通过实验方法,不同种类的粘合剂的效果不是太精确。在实验中,只能用一种胶粘剂恢复一个牙根。机械测试后,该牙根无法用其他胶粘剂修复。借助医学成像技术,逆向工程和有限元分析,可以精确重建摩尔模型并使用不同类型的粘合剂进行修复。将相同的咬合和咀嚼负荷分别用不同类型的粘合剂施加在相同的恢复的残留根模型上。 von Mises应力分析的结果表明,低杨氏模量的粘合剂可以有效地保护根管。但是,咀嚼时显然在根管口周围产生根管浓缩。杨氏模量大的胶粘剂可以缓冲牙根管口的应力集中。然而,由于粘合剂太难于缓冲负荷,可能破坏根管组织。

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