التقييم الميكانيكي الحيوي لثلاث طرائق في تثبيت كسور ارتفاق الفك السفلي باستخدام تحليل العناصر المنتهية

Abstract EN

Aim of The Study : The most stable pattern of fixation for fractures of the mandibular symphysis is a matter for ongoing debate.

The purpose of this study is to determine the most stable fixation method for mandibular symphysis fractures by comparing the mechanical characteristics of models fixed at different positions with different numbers of plates.

Material And Methods: Mandibular models were completed from Multi-sliced computed tomography (CT) images of mandible obtained under standard conditions.

Fractures were generated in 3-dimensional finite element models, and were fixed with a single miniplate, parallel double miniplates, or perpendicular double miniplates.

A 300 N perpendicular load was then applied to the lower molar region, and a finite element analysis was conducted.

Vertical gaps between the fractured surfaces, maximum stress within the screw/plating system, and maximum stress around screw holes in the bone.

Results: Compared to the single miniplate, both the parallel and perpendicular double miniplates demonstrated significantly less principal stress values in screw holes in the bone.

In addition, the perpendicular double miniplates had smaller vertical gaps between fracture surfaces when compared to other techniques .

Von mises stress values of all techniques were close and far from yield stress value of the metal of the plating system.

Conclusion: These results suggest that perpendicular double miniplate fixation is more suitable for fixing mandibular symphysis fractures