Three-demension Finite Element Analysis On LeFort Ⅰ Distraction Osteogenesis

Distraction osteogenesis (DO) has become a powerful new technique for reconstructing the hypoplastic and craniofacial skeletal deformities. It has been widely used to correct hemifacial microsomia and mandibular deficiencies. Although many researches have been done on the biomechanics of distraction osteogenesis, there are some unclear problems that need to be further studied. Finite element method (FEM) is a valid, non-invasive and accurate method to predict different parameters of the complex biomechanical behaviour of bone. There are some FEM study on mandibular DO, but few on maxilla. In my study, a three-dimensional finite element model of human cranial-maxillary complex osteodistraction was established. The stress distribution and displacement under different loads were evaluated. The experiment results were feasible and effective to the stress analysis in the process of orthodontic and orthognathic treatment. Methods:1. A voluntary healthy adult with normal occlusal relationship, healthy periodontal tissues and TMJ was chosen as a model. SCT image reconstruction technique and 3-D FEM were used in combination with Pro-e soft and ANSYS soft ware.2. Simulate maxillary LeFort I DO at four different directions and analyze the stress distribution and displacement trend of...