Finite element modeling of the periodontal ligament under a realistic kinetic loading of the jaw system

Alireza Karimi; Reza Razaghi; Hasan Biglari; Seyed Mohammadali Rahmati; Alix Sandbothe; Mojtaba Hasani

Saudi Dental Journal (Nov 2020)

Finite element modeling of the periodontal ligament under a realistic kinetic loading of the jaw system

Alireza Karimi,
Reza Razaghi,
Hasan Biglari,
Seyed Mohammadali Rahmati,
Alix Sandbothe,
Mojtaba Hasani

Affiliations

Alireza Karimi: Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Corresponding author at: Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Reza Razaghi: Department of Mechanical Engineering, University of Tabriz, Tabriz 51666, Iran; Basir Eye Health Research Center, Tehran, Iran
Hasan Biglari: Department of Mechanical Engineering, University of Tabriz, Tabriz 51666, Iran
Seyed Mohammadali Rahmati: Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
Alix Sandbothe: Children's Hospital & Medical Center, Omaha, NE, United States
Mojtaba Hasani: Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran

Journal volume & issue: Vol. 32, no. 7
pp. 349 – 356

Abstract

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Purpose: The stresses and deformations in the periodontal ligament (PDL) under the realistic kinetic loading of the jaw system, i.e., chewing, are difficult to be determined numerically as the mechanical properties of the PDL is variably present in different finite element (FE) models. This study was aimed to conduct a dynamic finite element (FE) simulation to investigate the role of the PDL (PDL) material models in the induced stresses and deformations using a simplified patient-specific FE model of a human jaw system. Methods: To do that, a realistic kinetic loading of chewing was applied to the incisor point, contralateral, and ipsilateral condyles, through the experimentally proven trajectory approach. Three different material models, including the elasto-plastic, hyperelastic, and viscoelastic, were assigned to the PDL, and the resulted stresses of the tooth FE model were computed and compared. Results: The results revealed the highest von Mises stress of 620.14 kPa and the lowest deformation of 0.16 mm in the PDL when using the hyperelastic model. The concentration of the stress in the elastoplastic and viscoelastic models was in the mid-root and apex of the PDL, while for the hyperelastic model, it was concentrated in the cervical margin. The highest deformation in the PDL regardless of the employed material model was located in the caudal direction of the tooth. The viscoelastic PDL absorbed the transmitted energy from the dentine and led to lower stress in the cancellous bone compared to the elastoplastic and hyperelastic material models. Conclusion: These results have implications not only for understanding the stresses and deformations in the PDL under chewing but also for providing comprehensive information for the medical and biomechanical experts in regard of the role of the material models being used to address the mechanical behavior of the PDL in other components of the tooth.

Published in Saudi Dental Journal

ISSN: 1013-9052 (Print); 1658-3558 (Online)
Publisher: Elsevier
Country of publisher: Saudi Arabia
LCC subjects: Medicine: Dentistry
Website: https://www.journals.elsevier.com/saudi-dental-journal/

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