Recently, three-dimensional (3D) simulations are frequently used to predict the outcome of orthognathic surgery and treatment for jaw deformity patients. In these simulations, the maxilla /mandible and teeth are constructed from CT and STL data. These simulations can indicate the post-operative and post-treatment conditions and images, and patients can use this information to decide whether to have orthognathic treatment or not.Of course, these simulations can also provide valuable information for the team approach between oral surgeons and orthodontists.