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A Study of the Mechanical Characteristics of a mandibular Parasymphyseal fracture with Internal Fixation Device Subject to Variable Bite Forces: Finite Element Analysis

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Journal of Biosciences and Medicines 2021年第4期9卷 158-178页

作者： Victor Caraveo Scott Lovald Tariq Khraishi Mechanical Engineering Department University of New Mexico Albuquerque New Mexico USA Exponent Inc. Menlo Park CA USA

In recent times, research into mandibular fracture has gained momentum from advances in scanning techniques, software/algorithm developments and improvements, and numerical structural modeling using the finite-element method (FEM). In this work, the FEM is used to model a mandibular fracture (using an inhomogeneous and orthotropic jaw model) simulating the effect of different bite tasks/forces on the stability of the fixated fracture. Specifically, bilateral and unilateral clenches (using muscle data) were studied using a low-profile 3D 4 × 2 hole mini-plate deployed for fracture fixation. Here, the mandible bone was treated as orthotropic and spatially inhomogeneous. Although the results of stress and displacement analyses, for this fixation hardware, indicate sufficient fixation under normal biting conditions, the results show that the unilateral and ipsilateral bites develop, in general, the highest stresses or displacements. Such results can guide post-surgery recommendation on bite behavior.

关键词： Mandible mandibular fracture Internal Fixation Finite-Element Modeling Bite Forces

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An experimental study of a novel external fixator based on universal joints for the rapid initial stabilization of mandibular comminuted fractures

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Chinese Journal of Traumatology 2024年第5期27卷 254-262页

作者： Zhi-Qiang Hu Tai-Qiang Dai Lu Zhao Xun Li Xu Gong Hao Jia Hai-Tao Kong Bo-Lei Cai Shi-Ping Chang Lei Tian State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Clinical Research Center for Oral DiseasesDepartment of Oral and MaxillofacialSchool of StomatologyThe Fourth Military Medical UniversityXi'an710032China The 80th Group Army Hospital of PLA Weifang261000Shandong provinceChina The Third Affiliated Hospital The Air Force Military Medical UniversityXi'an710038China State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral DiseasesShaanxi Clinical Research Center for Oral DiseasesDepartment of Dental MaterialsSchool of StomatologyThe Fourth Military Medical UniversityXi'an710032China

Purpose:Shaping and assembling contemporary external fixators rapidly for the severe mandibular fractures remains a challenge,especially in emergency *** designed a novel external fixator that incorporates universal joints to provide the stabilization for mandibular comminuted *** study aims to confirm the efficacy of this novel external fixator through biomechanical tests in vitro and animal ***:In vitro biomechanical tests were conducted using 6 fresh canine with mandibular defect to simulate critical comminuted *** mandibles were stabilized by the novel external fixator and other mandibles were fixed by 2.5 mm reconstruction *** fixed mandibles were subjected to loads of 350 N on the anterior regions of teeth and 550 N on the first molar of the unaffected *** stability was evaluated based on the maximum displacement and the slope of the load-displacement *** animal experiments,9 beagles with comminuted mandibular fractures were divided into 3 groups,which were treated with the novel external fixation,reconstruction plate,and dental arch bar,*** general observation,the changes in animals’weight,and the surgical duration were recorded and compared among 3 *** CT scans were performed at various intervals of 0 day(immediately after the surgery),3 days,7 days,14 days,21 days,and 28 days to analyze the displacement of feature points on the canine mandible and situation of fracture healing at 28 *** statistical significance was assessed by the two-way analysis of variance test followed by the Bonferroni test,enabling multiple comparisons for all tests using GraphPad Prism10.1.0(GraphPad Inc,USA).Results:The outcomes of the biomechanical tests indicated that no statistically significant differences were found in terms of the maximum displacement(p=0.496,0.079)and the slope of load displacement curves(p=0.374,0.349)under 2 load modes between the external and internal fixation grou

关键词： External fixation mandibular fracture Battle injuries Damage control

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