Effect of Using Different Methods of Plate Fixation in Maxillary Lefort One Fractures Publisher



Khiabani K¹ ; Keyhan SO² ; Ahmadi P³ ; Gholamian A² ; Cheshmi B²
Source: Journal of Oral and Maxillofacial Surgery# Medicine# and Pathology Published:2019

Abstract

Objective: Maxillary fracture is the most prevalent fractures of the face. The aim of this study is to evaluate efficiency and disadvantages of different types of plate fixation in maxillary Lefort l fracture by using finite element analysis. Methods: Three-dimensional model was reconstructed from Cone-Beam-tomography (CBCT) for finite element analysis. Then the fracture fixed by 4 methods of using L-type mini-plates or two-hole mini-plates in the Piriform or Zygomatic buttress. Forces were applied to measure the stress on the plates, screws, adjacent bone and the movement in the bony segments in 2 patterns of Bite force; Incisal clenching (INC) and intercuspal position (ICP). Result: The maximum amount of stress was seen on the screws, plate-bar and bone adjacent to fracture line. These amounts were measured 29Mpa & 33Mpa consequently in type B (four 4-hole L shape) plate fixation in ICP and in type A (four 2-hole) plate fixation in INC patterns of Bite forces. However, the maximum amount of movement was observed in type A of plate fixation and the most stable method was Four L- shape plate fixation, the differences between stresses and movements in different fields of evaluation were not significant. Conclusion: It can be concluded that there were no significant differences in these 4 types of plate fixation to show any superiority in clinical application. © 2019 Asian AOMS(+) ASOMP(+) JSOP(+) JSOMS(+) JSOM(+) and JAMI