Although the patient is examined for any pathologic conditions and medical problems, the orthodontist generally concentrates his or her focus on diagnostic considerations of the structural imbalances. The tools to help orthodontists make accurate differential diagnoses of malocclusion, especially skeletal disharmonies, are the panorama, lateral cephalometrics, posterior anterior cephalometrics, diagnostic set-up, mounted models, facial photography, study model. Among the diagnostic aids, cephalometic analysis often have been used as the cornerstone of the differential diagnostic process for skeletal imbalances. But many of the popular analysis in use are limited by the lack of the correlation of angular or linear measurements to soft tissue contours. Burstone and others developed to assess and plan for orthognathic surgery. This system was called the Cephalogram for Prthognathic Surgery. Though this system was very useful in diagnosing the nature of a facial dysplasia, it has the limitation of a two-dimensional cephalometic analysis. Therefore we used the Rapid Protyping System to simulate the orthognathic surgery with three dimensional model. RP system needs the CT scanning or MRI data to make the RP model. RP model can be used for simulation surgery, determining accurate amount of surgical movement. In addition to, we could achieve lots of information such as where the osteotomy to be performed, where the bone plate to be fixed, and so on. The present case reports shows how we can more effectively achieve the esthetic results through the using three dimensional RP model when we make the diagnosis and treatment planning of the patient with the severe craniofacial deformity.
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