Analysis Of Dentoalveolar Sructures With Novel Corticotomy-Facilitated Mandibular Expansion: A3-Dimensonal Fea Study

Surgically assisted mandibular arch expansion has proven to be an effective treatment modality in alleviating constriction and crowding issues. However, only mandibular symphyseal osteotomy has been in favor for the purpose of mandibular arch expansion. Besides, there is no relevant study to compare biomechanical response of different corticotomy designs on mandibular expansion. Therefore, this study is aimed to evaluate the effect of different corticotomy approaches and modes of loading on the expansion of adult mandible using biomechanics.To address the research purpose, a total of 9 Finite Element models including two novel corticotomy designs were simulated. Stress, strain and displacement of crown, root and bone were calculated and compared under different corticotomy approaches and loading conditions.The biomechanical response envisaged by the FE models in terms of displacement on X axis, was consistent from anterior to posterior teeth with parasymphyseal step corticotomy and tooth borne mode of force application. In addition the amount of displacement predicted by parasymphyseal step corticotomy with tooth borne mode was more, compared to other models.In conclusion, the results of our study suggest, parasymphyseal step corticotomywith tooth borne mode to be a viable treatment option for true bony expansionin adult mandible.