Application Of Computer-aided Design In BSSRO Combined With Simultaneous Osseous Genioplasty

Background:Some patients suffer from mandibular protrusion and microgenia in China. In the past, since lack of accurate preoperative design, the clinical outcome were always far from ideal with bilateral sagittal split ramus osteotomy (BSSRO).Objective:This study was aiming to improve the accuracy of BSSRO and genioplasty by the computer-aided design(CAD) preoperatively and to explore the necessity and feasibility of BRSSO with genioplasty at the same stage.Methods:7patients with mandibular protrusion and microgenia undergoing BSSRO and genioplasty were collected.3D reconstruction models were applied to design and prefabricate the individualized surgical splint. To estimate the precision of CAD, we compared the CAD’s three-dimensional cephalometry with postoperative ones. And to assess the stability of clinical outcome by comparing the postoperative three-dimensional cephalometry and follow-up’s.Results:All7patients got perfect clinical situation, with few complications. The statistical analysis demonstrated that:1)there were statistically significant differences between preoperative three-dimensional cephalometry and postoperative ones,2)there were no statistically significant differences between preoperative design and postoperative ones,3)excepting for SNB and Pog-NB, there were no statistically significant differences between postoperative ones and follow-up’s.Conclusion:Computer aided design can help surgeons obtain the accurate individual surgery plan for patients with mandibular protrusion companying microgenia. CAD can play a great role to improve the surgery accuracy.