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Does pulp cavity affect the center of resistance in three-dimensional tooth model? A finite element method study

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Abstract

Objectives

To compare the center of resistance (Cres) of the maxillary central incisor in models with and without the pulp cavity and to evaluate the association of pulp cavity/tooth volume ratio and difference in Cres position between the two models.

Materials and methods

CBCT images of the right maxillary central incisor were collected from 18 subjects. Pulp cavity/tooth volume ratio was measured, and finite element models of teeth and periodontal structures were generated. Cres location was presented as a percentage of root length measured from the root apex. Differences in Cres positions between models were compared using the paired t-test, while the correlation between pulp cavity/tooth volume ratio and a difference in Cres was evaluated by Pearson’s correlation coefficient.

Results

For the pulp cavity model, the average location of the Cres measured from the apex of the root was 58.8% ± 3.0%, which resulted in a difference of 4.1% ± 1.1% (0.5 mm) apically, when compared with the model without pulp cavity. Differences in Cres between the models were statistically significant (P < 0.01), while the correlation between pulp cavity/tooth volume ratio and a difference in Cres between models was significantly positive (r = 0.709, P = 0.001).

Conclusions

In the pulp cavity model, the Cres was located in a more apical position. The difference in Cres between models increased as the pulp cavity/tooth volume ratio increased.

Clinical relevance

The line of force must be applied more apically in the pulp cavity model to achieve the desired orthodontic tooth movement.

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Acknowledgements

We would like to express our recognition to our statistical consultant and our academic English editor for amending our manuscript.

Funding

The work was supported by the Research Fund for Postgraduate Student of the Faculty of Dentistry, Chiang Mai, University, Chiang Mai, Thailand.

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Authors and Affiliations

  1. Department of Orthodontics and Pediatric Dentistry, Faculty of Dentistry, Chiang Mai University, Suthep Road, Muang, Chiang Mai, 50200, Thailand

    Kachaphol Kuharattanachai, Dhirawat Jotikasthira, Wikanda Khemaleelakul & Kanich Tripuwabhrut

  2. Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, Thailand

    Wetchayan Rangsri

Authors
  1. Kachaphol Kuharattanachai
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  2. Wetchayan Rangsri
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  3. Dhirawat Jotikasthira
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  4. Wikanda Khemaleelakul
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  5. Kanich Tripuwabhrut
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Contributions

Conceptualization: Kachaphol Kuharattanachai, Dhirawat Jotikasthira, Wikanda Khemaleelakul, Wetchayan Rangsri, Kanich Tripuwabhrut.

Investigation: Kachaphol Kuharattanachai

Data analysis and interpretation: Kachaphol Kuharattanachai, Dhirawat Jotikasthira, Kanich Tripuwabhrut

Writing — review and editing: Kachaphol Kuharattanachai, Dhirawat Jotikasthira, Wikanda Khemaleelakul, Wetchayan Rangsri, Kanich Tripuwabhrut

Corresponding author

Correspondence to Kanich Tripuwabhrut.

Ethics declarations

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards by the Human Experimentation Committee, Faculty of Dentistry, Chiang Mai University (No. 28/2019).

Informed consent

Informed consent was obtained from all individual participants involved in the study.

Conflict of interest

The authors declare no competing interests.

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Kuharattanachai, K., Rangsri, W., Jotikasthira, D. et al. Does pulp cavity affect the center of resistance in three-dimensional tooth model? A finite element method study. Clin Oral Invest 26, 6177–6186 (2022). https://doi.org/10.1007/s00784-022-04567-x

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  • DOI: https://doi.org/10.1007/s00784-022-04567-x

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