Official Publication of the National Center for Trauma Research Trauma Monthly 2251-7464 24 3 2019 05 01 Finite Element Simulation of Displaced ZMC Fracture After Fixation with Resorbable and Non-Resorbable One-Point Mini-Plates and Applying Normal to Severe Occlusal Loads 1 7 101992 10.5812/traumamon.85586 EN Farzin Sarkarat Department of Oral and Maxillofacial Surgery, Craniomaxillofacial Research Center, Dentistry Branch of Islamic Azad University of Medical Sciences, Tehran, Iran 0000-0002-1574-5625 Sogand Ebrahimi Private Practice in Dentistry, Tehran, Iran Roozbeh Kahali Department of Oral and Maxillofacial Surgery, Craniomaxillofacial Research Center, Dentistry Branch of Islamic Azad University of Medical Sciences, Tehran, Iran Amirparham Pirhadi Rad Department of Bio Medical Engineering, Faculty of Bio Medical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran Maryam Khosravi Private Practice in Dentistry, Tehran, Iran Vahid Rakhshan Private Practice in Dentistry, Tehran, Iran Journal Article 2020 01 23 Background: ZMC fractures are the second most common trauma of the face. Therefore, their treatment (including methods of fixation) is of clinical significance. Objectives: Due to the lack of studies on many resorbable and non-resorbable fixations of the zygoma, this finite element analysis assessed for the first time displacements and dynamics of the zygoma fixed using three 1-point resorbable and three non-resorbable plates under normal and severe mastication forces. Methods: After creating the 3Dmodelof the zygoma and its adjacent bones basedon aCT scanof amale patient,with linearfractures but without severe dislocations, three one-point resorbable and three similar one-point non-resorbable mini-plates were used to fix the zygoma with miniscrews. The zygomaticomaxillary buttress (ZMB), infraorbital rim, and frontozygomatic (FZ) suture were stabilized using L-shaped four-hole, curved five-hole, four-hole miniplates, respectively. The simulated zygoma was subjected to 150N and 750N loads. Minimum and maximum of stresses, strains, displacements, and rotational displacements of the zygoma were measured. Results: All four parameters were much smaller in non-resorbable fixations compared to resorbable ones. In severe maxillary force, the parameters stress, strain, and displacement increase considerably. Among these, FZ might cause smaller displacements. Resorbable plates might not be optimum choices for one-point fixation of cases with the heavy mastication loads.

https://www.traumamon.com/article_101992_aee8e50b7297f2391dac5c1fba2466cb.pdf