General Planning and Preoperative Assessment

After clinical diagnosis and evaluation of the current situation of the patient’s face, profile, and dentition, the surgeon must decide which treatment procedure will be necessary. Will single jaw surgery be sufficient to achieve the desired final result or is it better to perform corrective surgery in both jaws? And if correction in one jaw is sufficient, should the surgery be performed in the upper or lower jaw? The surgical plan, which includes the actual movements of the jaw, provides guidance during surgery and a prediction of the final result. A two-dimensional cephalometric analysis on the lateral cephalogram is performed to predict the sagittal transposition and rotation of the bony structures. With 3D analysis, the movements of the jaws can be predicted in three dimensions. In addition, the 3D surgical planning can be used for wafer design or waferless surgery using PSIs (PSI = patient specific implant).