Abstract
Objective
The aim of this study was to develop a new method for creating a multi-component and true scale 3-dimensional (3D) model of a human tooth based on cone-beam computed tomography (CBCT) images.
Materials and methods
First maxillary premolar tooth model was reconstructed from a patient’s CBCT images. The 2D serial sections were used to create the 3D model. This model was used for finite element analysis (FEA). Model validation was performed by comparing the ultimate compressive force (UF) obtained experimentally using a universal testing machine and from simulation. The simulations of three component-omitting models (silicone, cementum, and omitting both) were performed to analyze the maximum (max.) principal stress and stress distribution.
Results
The simulation-based UF indicating tooth fracture was 637 N, while the average UF in the in vitro loading was 651 N. The discrepancy between the simulation-based UF and the experimental UF was 2.2%. From the simulation, the silicone-omitting models showed a significant change in max. principal stress, resulting in a UF error of 26%, whereas there was no notable change in the cementum-omitting model.
Conclusion
This study, for the first time, developed a true scale multi-component 3D model from CBCT for predicting stress distribution in a human tooth.
Clinical relevance
This study proposed a method to create 3D modeling from CBCT in a true scale and multi-component manner. The PDL-like component-omitting simulation led to a higher error value of UF, indicating the importance of multi-component tooth modeling in FEA. Tooth 3D modeling could help determine mechanical failure in dental treatments in a more precise manner.
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Acknowledgements
We thank Dr. Kevin Tompkins for critical review of the manuscript.
Funding
The work was supported by the Dental Research Fund (3200502–03/2016 and DRF61016) of the Faculty of Dentistry, Chulalongkorn University, and the Thailand Research Fund (TRG 5800218). The Center of Excellence for Regenerative Dentistry Project is supported by the Chulalongkorn Academic Advancement into its Second Century Project, the Ratchadapisek Sompoch Endowment Fund. We also acknowledge financial support funded by Thai-Nichi Institute of Technology (1804/A014).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of Human Research Ethics Committee at the Faculty of Dentistry, Chulalongkorn University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Limjeerajarus, N., Dhammayannarangsi, P., Phanijjiva, A. et al. Comparison of ultimate force revealed by compression tests on extracted first premolars and FEA with a true scale 3D multi-component tooth model based on a CBCT dataset. Clin Oral Invest 24, 211–220 (2020). https://doi.org/10.1007/s00784-019-02919-8
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DOI: https://doi.org/10.1007/s00784-019-02919-8