Shanghai Journal of Stomatology

Shanghai Journal of Stomatology ›› 2025, Vol. 34 ›› Issue (5): 472-476.doi: 10.19439/j.sjos.2025.05.004

• Original Articles • Previous Articles     Next Articles

Three-dimensional finite element analysis of single anterior implant restoration under three occlusal conditions based on design of crown root ratio

Liang Xiongsui1, Li Yanling2, Huang Xin1, Ma Li3, Wang Mengchuang1, Chen Yeqing4, Liang Chenyu4, Deng Min1   

  1. 1. Department of Stomatology, Affiliated Hospital of Youjiang Medical University for Nationalities. Baise 533000;
    2. Department of Stomatology, Yulin Red Cross Hospital. Yulin 537000;
    3. Department of Stomatology, Nanning Ninth People's Hospital. Nanning 530100;
    4. Youjiang Medical University for Nationalities. Baise 533000, Guangxi Zhuang Autonomous Region, China
  • Received:2024-07-15 Revised:2024-08-21 Online:2025-10-25 Published:2025-10-31

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Abstract: PURPOSE: By constructing a three-dimensional model of anterior teeth with different crown-to-root ratios, the stress distribution and fatigue state of the implant denture model were analyzed under different occlusion conditions. METHODS: SolidWorks modeling software was used to establish a platform switching amount of 0.4 mm and the corresponding crown-root ratio of 1∶1, 1.5∶1, 2∶1 were constructed, and a total of 3 groups of incisor implant restoration models were constructed. In the Ansys Workbench analysis software, the central incisors were designed to have three kinds of occlusion modes, edge to edge occlusion, shallow overbite, deep overbite, and the loading force was 100 N at 45° with the long axis of the teeth. The peak value and distribution of von-Mises stress of implant and implant-bone interface in each group were analyzed. RESULTS: The peak von-Mises stress was edge to edge occlusion > shallow overbite > deep overbite. The peak values of equivalent stress of abutment, abutment screw and cortical bone increased with the increase of crown-root ratio when edge to edge occlusion and shallow overbite were chosen. There was no significant change in the stress value of the abutment, the abutment screw and the cortical bone during deep overbite. The stress concentration parts of the mode, when the posterior teeth were subjected to lateral force and the anterior teeth were edge to edge occlusion and shallow overbite, the stress concentration occurred at the abutment neck, the middle of the abutment screw and the implant-bone edge. CONCLUSIONS: With the increase of crown to root ratio, the lateral stress of the planting model increases; when the crown-to-root ratio ≥1.5∶1, the peak von-Mises stress on the abutment and the abutment screw exceeds the yield strength of pure titanium. When the model is subjected to lateral force, the neck of the abutment and the middle of the screw are prone to experience fatigue. The lateral force of the implant denture should be reduced during repair.

Key words: Implant restoration, Crown root ratio, Finite element analysis, Maxillary anterior teeth

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