Evaluation of stability and stress distributions of 5 different fixation systems used in advancement genioplasty by finite element analysisBackground: The aim of this genioplasty study is the comparison of titanium monocortical miniplate and bicortical screw fixation systems in terms of displacement, primary stresses and von-mises stress by finite element analysis.Methods: In our study, genioplasty osteotomy was performed and the fragment was placed 5 mm anterior. In 5 different models using single genioplasty plate, 2 flat plates, 3 flat plates, 2 bicortical screws and 3 bicortical screw fixation models as fixation, 80 N force was applied to the distal segment in the horizontal direction. The displacement and stress values were evaluated by finite element analysis.
Results:The shortest displacement was observed in the three titanium bicortical screws system, while the longest displacement was observed in the single genioplasty plate system. The lowest and highest von-mises stress was seen in three titanium bicortical screw system and single genioplasty plate, respectively. The maximum von-mises stress was observed in three flat plate fixation system, while the minimum von-mises was observed in plate fixation system. The maximum compression bone stress was recorded in two bicortical screw system, the minimum compression bone stress was recorded in two and three flat plate systems.
Conclusion:Although bicortical screw groups give better results in terms of displacement and von-mises stress stresses, plate groups were found more favorable in terms of stress and compression stresses. However, the results are within physiological limits for all groups.