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Clenching TMJs-Loads Increases in Partial Edentates: A 3D Finite Element Study

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Abstract

Goal This study tests the hypothesis of loading-dependence on the temporomandibular joint during clenching on the particular of experimentally partial edentate conditions. Methodology A complete and detailed finite element model of the temporomandibular joint (TMJ) was used. The closing movement of the mouth was reproduced by contracting the closing muscles of the masticatory system. Electromyography (EMG) data were taken from 10 healthy, dentulate volunteers, both with and without intraoral appliances. The intraoral appliances served to mimic nine partially edentulate (PE) conditions for each volunteer. The EMG data were fed into the finite element model (FEM) for each condition and the loading of the joint was analyzed. Results The results obtained show that muscular activity decreases when the contact between teeth disappears. In particular, the numerical results showed that when there is no contact between the posterior teeth an overload of the joints appeared. Moreover, the existence of a unilateral unique molar induced asymmetric overloading in the TMJ disc without posterior contact. Conclusions During clenching, a uniform distribution of the dental contact along the maxillar arches prevents the TMJ from overloading. In contrast, severe partial edentation seems to induce overloading of the TMJ with severity depending on the type of contact.

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Acknowledgments

The authors thanks to Prof. Otero Cepeda from the Statistics Department of Santiago de Compostela University for his support in the statistical part. The authors gratefully acknowledge the support of the Spanish Ministry of Education and Research through the research project DPI2006-14669.

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Correspondence to Amaya Pérez del Palomar.

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Pérez del Palomar, A., Santana-Penín, U., Mora-Bermúdez, M.J. et al. Clenching TMJs-Loads Increases in Partial Edentates: A 3D Finite Element Study. Ann Biomed Eng 36, 1014–1023 (2008). https://doi.org/10.1007/s10439-008-9487-y

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  • DOI: https://doi.org/10.1007/s10439-008-9487-y

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