Recently, double-jaw surgery is increasing in orthognathic surgery. In such double-jaw surgery, it is important to keep the condylar position at the preoperative position during surgery. Various condylar positioning devices (CPDs) have been reported to obtain stable skeletal and occlusal results. In this study, we investigated the availability of two methods (one step and two steps techniques) for condylar positioning. The subjects were 17 mandibular prognathic patients who underwent double-jaw surgery by a single operator. These 17 patients were divided into the one step technique group (n = 9) and the two steps technique group (n = 8) by the difference of methods for repositioning the mandibular proximal segment. In both groups, ramus inclination and ramus angulation were examined pre- and postoperatively using lateral and posteroanterior cephalograms. Pre- to postoperative changes of these angles were stable in both groups. Statistical analysis revealed no significant difference between the two groups. These results suggest that application of our two CPDs is useful in mandibular prognathic cases undergoing double-jaw surgery. In addition, our CPDs can standardize the procedure of orthognathic surgery without depending on the experience of surgeons.
