Dissertation
Dissertation > Medicine, health > Oral Sciences > Oral and maxillofacial surgery

Biomechanics of Rigid Internal Fixation in Simple Displaced Fracture of Zygoma through3D FEM Simulation

Author DaiYan
Tutor ZhaoHuaQiang
School Shandong University
Course Clinical Stomatology
Keywords the simple displaced fracture of zygoma fracture 3D FEM rigidinternal fixation absorbable material
CLC R782
Type Master's thesis
Year 2012
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Objective:This study was designed to observe the stress distribution of the simple displaced fracture of zygoma under different rigid internal fixation(RIF)methods by developing a three-dimensional finite-element method(3D FEM).Methods:1.To establish the zygoma and the fixed-system3D finite element model: Choose a healthy adults as the research object.CT scan technology, the finite element software Mimics and UGNX6.0were used to establish the human zygoma and the fixed-system3D finite element models. Based on this model, the RIF models on the fracture model was established in three different ways.2.Stress and deviation distributions analysis in the finite element model:software MSC.Marc was used to observe the stress distribution of different methods. The three fixation ways were1.one point fixation at zygaomaticomaxillary butterss(ZMB)with L-type Titanium plate.2.three points fixation at zygaomaticomaxillary butterss and zygomaticofrontal suture and inferior orbital rim(ZMB+ZF+IOR) titanium plate.3.one point fixation at zygaomaticomaxillary butterss with absorbable plate.Results:1.The zygoma reconstruction of three-dimensional models had good mechanical geometric similarity.It is the finite element analysis of the three-dimensional finite element basis.2.3D finite element models of zygomatic fractures under different rigid internal fixation were constructed. One titanium plate fixation system finite element model consists of21339nodes and85720units;the three-point titanium plate fixation system finite element model consists of28613nodes and113655units; the absorbable plate fixation system finite element model consists of of32837nodes and129,206units.3.The vons-Mises stress distribution:the highest stress concentrated in the middle of the titanium plate in the L-type titanium plate fixation and the figures were30.32MPa (INC),98.84MPa (ICP),58.50MPa (RMOL) and63.39MPa (LMOL), while in the three titanium plates fixation. The vons-Mises figures69.73MPa,135.43MPa,103.14MPa and108.74MPa. In the absorbable plate fixation, the biggest stress concentrated in the middle of the top plate, in proper occlusion, the figures were23.51MPa,93.97MPa,56.69MPa and60.56MPa.4.Fracture mobility:fracture mobility was calculated for bite forces applied on incisors, fracture side and non-fracture side. In the L-type titanium plate fixation, the furthest mobility is0.121mm; in the three titanium plates fixation, the furthest mobility is0.061mm;while in the absorbable plate fixation, the furthest mobility is0.0926mm.Conclusions:1.3D FEM was a reliable way of analyzing the simple displaced fracture of zygoma. It could be used for a variety of finite element analysis of working conditions.2.Simulated the contraction of the masseter muscle over the functional occlusion. The vons-Mises stress distribution and fracture mobility were calculated from the3D finite element models of zygomatic fractures.3.The results showed that the three titanium plates fixation was more stable than the L-type titanium plate fixation.But the L-type titanium plate fixation could also provide sufficient stability for the zygoma fracture.4.The absorbable plate fixation had the similar effect as the L-type titanium plate fixation.

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