A 3D Finite Element Analysis of Stress on Temporomandibular Joint due to Maxillary Protraction Appliances with Varied Force Levels and Angulations
Yusuf MD Nasir Khan, Prashantha G Shivamurthy, Sharanya Sabrish, Silju Mathew, Sameera Athar
Face mask, Finite element analysis, Growth modulation
Citation Information :
Nasir Khan YM, Shivamurthy PG, Sabrish S, Mathew S, Athar S. A 3D Finite Element Analysis of Stress on Temporomandibular Joint due to Maxillary Protraction Appliances with Varied Force Levels and Angulations. World J Dent 2020; 11 (2):128-133.
Aim: The aim of this study was to measure the stress distributions on the temporomandibular joint (TMJ) due to the face mask appliance using different levels of forces and different angulations. Material and methods: A three-dimensional finite element model of the craniofacial complex was constructed from a cone-beam computed tomography (CBCT) scan of a patient, with the help of the Mimics software. The forces were applied on the hooks and the anchorage was taken from the chin and the forehead. Four different force directions were applied—0, 10, 20, and 30° from the occlusal plane with each having three different force levels, 800 g, 1000 g, and 1200 g (combined force on both sides). The stress distribution of TMJ was analyzed. Results: The results indicate that the maxillary protraction appliance has a reactionary force on TMJ. Maximum stress was observed with 1200 g load and at the 0° angulation condition and the minimum stress was observed for 800 g load and at an angulation of 30°. Conclusion: On the articular disk, condylar cartilage, glenoid fossa, and condyle, stresses increased with increase in load. However, with an increase in angulation for the given load, the stresses reduced gradually. Clinical significance: The results indicate that the maxillary protraction appliance has a reactionary force on TMJ. Stresses induced by facemask appliance due to increased forces with low angulation could be a factor in temporomandibular joint disorders (TMDs).
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