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Trauma Mon. 2019;24(3): e85586.
doi: 10.5812/traumamon.85586

Scopus id: 85067206213
  Abstract View: 94
  PDF Download: 79

Research Article

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

Farzin Sarkarat 1 * , Sogand Ebrahimi 2, Roozbeh Kahali 1, Amirparham Pirhadi Rad 3, Maryam Khosravi 2, Vahid Rakhshan 2

1 Department of Oral and Maxillofacial Surgery, Craniomaxillofacial Research Center, Dentistry Branch of Islamic Azad University of Medical Sciences, Tehran, Iran
2 Private Practice in Dentistry, Tehran, Iran
3 Department of Bio Medical Engineering, Faculty of Bio Medical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
* Corresponding author: Associate Professor, Department of Oral and Maxillofacial Surgery, Craniomaxillofacial Research Center, Dentistry Branch of Islamic Azad University of Medical Sciences, Neyestan 10th, Pasdaran Ave., Tehran, Iran. Email: sarkarat@hotmail.com; Email: drha1345@yahoo.com

Abstract

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 3Dmodel of the zygoma and its adjacent bones based on a CT scan of amale patient, with linear fractures 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.

Keywords: Fracture, Zygomaticomaxillary Complex, Internal Fixation, Displacement, Finite Element Analysis (FEA)

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Submitted: 20 Oct 2018
Revised: 28 Jan 2019
Accepted: 29 Jan 2019
First published online: 11 May 2019
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