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Biomechanical Analysis of Mandibular Implant-Assisted Removable Partial Denture with Distal Extension

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Abstract

Purpose

This study aimed to evaluate the mechanical performance of mandibular implant-assisted removable partial dentures (IARPDs) on abutment teeth, supporting implants, and the mucosa. A risk assessment of patient discomfort and complications was also conducted to provide a design reference for clinical use.

Methods

Mandibular IARPDs with distal extension were analyzed using the finite element method. The mechanical performance of IARPDs was evaluated for varying numbers of missing teeth, crown-to-root ratios of abutment teeth, and locations of occlusal rests.

Results

When an implant was placed at the distal end, the peak von Mises stress in the cortical bone surrounding the abutment tooth was 14.8% lower than that when at the mesial end. Simultaneously, the peak von Mises stress was reduced by 76.7% over the mucosa and increased by 206.7% in the cortical bone surrounding the implant. The use of distal occlusal rests increased the peak von Mises stresses in the cortical bone surrounding the abutment tooth by 8.4% compared to that when using mesial occlusal rests. When the crown-to-root ratio of the abutment tooth increased from 1 to 1.5, the peak von Mises stress in the cortical bone surrounding the abutment tooth increased by 168.7%.

Conclusion

An IARPD with a distal implant can reduce the risk of post-op complications. When the crown-to-root ratio of the abutment tooth is adequate, the distal occlusal rest can be used for IARPDs of distal free ends.

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Acknowledgements

The authors would like to thank Professor Dr. Chih-Han Chang and for his guidance and the experimental instruments support in this research.

Funding

This work was supported by the Ministry of Science and Technology, Taiwan (Grant number 07-2221-E-006-052-MY2).

Author information

Authors and Affiliations

  1. School of Dentistry & Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC

    Yung-Chung Chen

  2. Division of Prosthodontics, Department of Stomatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan, ROC

    Yung-Chung Chen

  3. Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan, ROC

    Chi-Lun Lin, Chen-Han Yu, Yang-Ming Lin & Jia-Wei Lin

  4. Medical Device Innovation Center, National Cheng Kung University, Tainan, Taiwan, ROC

    Chi-Lun Lin

  5. Department of Biomedical Engineering, HungKuang University, Taichung, Taiwan

    Hung-Chih Chang

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  1. Yung-Chung Chen
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  2. Chi-Lun Lin
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  3. Chen-Han Yu
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  4. Hung-Chih Chang
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  5. Yang-Ming Lin
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Corresponding author

Correspondence to Chi-Lun Lin.

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The authors have no relevant financial or non-financial interests to disclose.

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Chen, YC., Lin, CL., Yu, CH. et al. Biomechanical Analysis of Mandibular Implant-Assisted Removable Partial Denture with Distal Extension. J. Med. Biol. Eng. 42, 534–543 (2022). https://doi.org/10.1007/s40846-022-00738-z

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  • DOI: https://doi.org/10.1007/s40846-022-00738-z

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