Dynamics Simulation Research Of Early Stability In The Diorthosis Of Deformans Mandible

All kinds of complicated jaw malformation,especially micromansibular deformity,emifacial microsomia, hemifacialgrowth defective of facial dysmorphism,comgenital malformation of incidence of a disease is second only geneogenous cheilopalatognathus.clinician have adopted Sagittal Split Ramus Osteotomy (SSRO) and Mandible Distraction Osteogenesis(MDO),which have obtained good effective.However,the post-operation modality changed to cause the high complication rate of bone relapse, absorption of condyle and disorder of temporomandibular joint,discern 14 percent,21 percent and 71 percent.because mandible and temporomandibular joint(TMJ) possess openning and closing mouth,chew move modality ,which possess representativeness with other regions plastic operation.It is very important of purpose to reaserch of cause reason of the high complication rate. To study the dynamics reason of the high complication rate of bone relapse, absorption of condyle and disorder of temporomandibular joint after the orthomorphia of abnormity mandible. CT scan data were processed by using Simpleware 3.2 or Mimics 13.1 software for three-dimensional (3D) reconstruction.The CT images is supplied to established the 3D solid models of normal mandible, pre-operation ,virtual operation and post-operation of abnormity mandible; And after imported into FEA software Abaqus 6.8, the models will be executed the preprocessing and finite element calculation to analysis contrast research and bilater conlylar stress distribution. Data are presented as mean±S.E.M. Experiments between two groups were analyzed by t test. Multiple groups were analyzed by one-way ANOVA followed by LSD multiple comparison test. There was significant difference between the groups (P<0.05).Normal mandible bilater conlylar stress distribution have significant difference(P<0.05). Compared with the control group, preoperation mandible were both significant difference (P>0.05).virtual operation were no significant difference (P>0.05).After 6 mouths post-operation and virtual operation no significant difference(P>0.05). Electromyogram is a steady state metod which examined muscles.finite element technique is a new method that can complish preoperative dynamics design and predict effect,follow up mechanics changing post-operativemuscle and joint .so as to improve operative precison and decrease post-operative high rate of complication.