Comparative Biomechanical Analysis of Fixation of Mandibular Body Defect with Small Titanium Plate and Reconstruction Plate of Fibula
Objective The three-dimensional finite element method was used to compare stress distribution and displacement of mandibular body defect reconstructed with fibula fixed with miniplates and the reconstruction plate and to provide mechanical reference for selection of internal fixation in clinical practice.Methods Three-dimensional finite element model of mandibular body defect reconstructed with fibula fixed with miniplates or reconstruction plate was established,and simulation contralateral molar vertical loading.Maximum stress of plate,the bone around screw and maximum displacement of the front and rear ends of the fibula were compared and analylsed.Results Finite element model of mandibular body defect reconstructed with fibula fixed with miniplates or reconstruction plate was established.Maximum stress of plate occurred in the region of mandibular angle,all located on the upper edge of the plate or the upper rear titanium plate(miniplates group).Maximum stress of reconstruction plate was 31.645 MPa,while that of miniplates was 37.031 MPa.and they were all lower than the failure limit of titanium alloy materials.Maximum stress values of bone around screw occurred in the nail hole closest to anterior mandibular stumps/fibula junction,value in reconstruction plate group was 4.712 MPa,while that in miniplates group was 8.243 MPa.They are also lower than the yield strength of cortical bone.The total displacement of the anterior end of the fibula was greater than that of the posterior end,and the results of the two titanium plate groups were similar.Conclusion Both reconstruction plate and miniplates can meet the biomechanical fixation requirements of mandibular body defect reconstructed with fibula.
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