Methods: Twelve consecutive patients undergoing a double-jaw orthognathic surgery to treat dentofacial deformities were enrolled in this study. Following our CASS clinical protocol, the 3D computer composite skull model for each patient was generated. These models then undergone two virtual surgical procedures based on two different surgical plans. An experienced surgeon planned the 1st surgery using CASS method, which was also used in the patient's actual treatment. At least a year later, the same surgeon planned the 2nd virtual surgery using the traditional planning methods. Two experienced CMF surgeons were invited at two different occasions to evaluate the outcomes of both virtual surgeries.
Results: The outcomes achieved with CASS method were statistically significantly better in each measurement then those planned with traditional methods. The outcome difference between the two planning methods was greater in those patients with more severe or asymmetrical deformity and was less pronounced in patients with mild and symmetrical deformity
Conclusions: This study has confirmed that the surgical outcome achieved with CASS method is significantly better than the outcome achieved with the traditional planning methods in double-jaw orthognathic surgery