Finite Element Analysis of Different Repairing Designs for Maxillary Central Incisor with Oblique Defect

doi:10.13701/j.cnki.kqyxyj.2020.03.017

Abstract

Abstract: Objective: To analyze the stress distribution of maxillary central incisor oblique fracture with different repair methods by three-dimensional finite element analysis. Methods: The finite element models of maxillary central incisor with oblique fracture were established using CBCT and finite element software. The conditions were then created according to three repair methods after root canal treatment. The Von Mises equivalent stress and maximum principal stress distribution and peak value of each model were analyzed. Results: (1) In the same kind of fracture mode, the equivalent stress value of the remaining tooth tissue was: the fiber post-core-crown group was the largest and the 5 mm deep endocrown group was the smallest. The equivalent stress value of the prosthesis was: the cast post-core-crown group was the largest and the fiber post-core-crown group was the smallest. The equivalent stress peak of the bond layer of the fiber: post-core-crown group was the highest. (2) With the increase of the height of ferrule, the equivalent stress of the remaining tooth tissues was reduced, and the reduction rate of the fiber post-core-crown group and the cast post-core-crown group was larger than that of the endocrown group. When the lingual ferrule height increased, the equivalent stress reduction rate of residual tooth tissue was greater than that of the lip ferrule height. Conclusion: Complete and high enough dentin ferrule is a requirement for repairing heavily defected maxillary central incisor with fiber post-core crown and cast post-core crown. When the dentin ferrule is incomplete, lingual ferrule is better than lip ferrule to improve the fracture resistance of residual dentin.When the maxillary central incisor obliquely fractured and the ferrule is incomplete, the stress distribution of the endocrown is more excellent than post-core-crown. And the endocrown with a depth of 5 mm retainer may be the best repair method. As for post-core crown restoration, the cast post-core crown is more favorable for the uniform distribution of residual tooth tissue than the fiber post-core crown.

Key words: dentin ferrule, maxillary central incisor, endocrown, post-core-crown, three-dimensional finite element

LI Xixi, KANG Ting, CHEN Yanyu, SONG Danyang, GUO Ling. Finite Element Analysis of Different Repairing Designs for Maxillary Central Incisor with Oblique Defect[J]. Journal of Oral Science Research, 2020, 36(3): 259-263.

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