Finite element analysis of fixation of mandibular fracture in rabbits using PDLLA bone setting system by ultrasonic welding technology
Objective To investigate the effects of 2 different fixation methods on stress and displacement of rabbit mandibles after fixation.Methods Healthy adult New Zealand white rabbits,male,2～4 months old,weighing 3.0～3.5 kg.The rabbit mandible was extracted and the fracture model was made.Based on Micro CT data of mandibles of the rabbit,a finite element model of rabbit mandible fracture was con-structed after software processing.The rabbits were divided into ultrasonic welding technology group(ul-trasonic group)and traditional internal fixation technology group(screw in group)according to different fixation methods,using simulated bending experiment and occlusal experiment to analyze the resorbable plate,absorbable fixation nail and mandible displacement and stress under the 2 fixing methods.Results In the bending test,the fixation performance of the ultrasound group was better than that of the screw in group in terms of displacement,but in the occlusal test,the displacement of the mandible in the ultrasound group was larger and concentrated in the anterior tooth area,which reduced its stability.After the jaw was fixed by the ultrasonic welding technology,the fixation nail was easy to loose during chewing movement.Conclusion The fixation performance and initial stability of ultrasonic welding technology are similar to those of traditional internal fixation technology,but mechanical experiments are needed to further clarify its fixation performance,make it more suitable for oral and maxillofacial applications.
ultrasonic welding technologymandibular bone fracturefinite element analysis
万方数据
维普
