Mandibula Kırıklarında Diş Çekimli veya Çekimsiz İnternal Fiksasyonun Biyomekanik Stabilite Üzerine Etkisinin Değerlendirilmesi - Sonlu Eleman Analizi

Abstract

Mandibular fractures are the second most common fractures of the maxillofacial skeleton. Approximately, more than half of the mandibular fractures occur in the teeth-bearing region. Consequently, every fracture in the dentate areas has the potential to involve teeth in the fracture line. Technique of internal fixation via miniplate – monocortical screws are accepted as gold standart for treatment of mandibular fractures. Fracture stabilization, fixation and reduction can be effected by retention or extraction of teeth in the fracture line. The purpose of this study is to analyze the biomechanical behaviors and consequences of internal fixation of mandibular fractures with retain or extraction of teeth in the fracture line, through finite element analysis models. Finite element analysis is an efficient method for evaluation of biomechanical behaviors of mandibular fractures. Angulus, corpus and parasymphisis fractures were simulated on the right side of the mandibular model. Fractures of the mandible are referred to as horizontally and vertically unfavorable depending on the angulations of fracture and force of the muscle pull. Fracture lines fixated by miniplate – monocortical screws and all mastication muscle forces were applied to models. Displacement between fracture fragments and stress on osteosynthesis materials values were analysed by using von Mises Stress and principal stress. As a result, retention of teeth in the fracture line has showed better biomechanical behaviours.