Proportion relation of soft and hard tissue movement after bilateral sagittal split ramus osteotomy

Objective To observe the soft and hard tissue movement ratios after bilateral sagittal split ramus osteotomy (BSSRO) and retropositioning of mandible and give the reference to clinic. Methods BSSRO was performed in 33 cases to setback the mandible. The patients were examined with lateral cephalometric radiographs one week before and six months or more after surgery. Results The ratios in soft tissue points Li and Mes are different to other articles. There is correlation between soft and hard tissue only in points B and Pg. Conclusion The ratios of soft to hard tissue are difference in ethnic. When to predict the soft tissue profile, the hard tissue points B and Pg have more significance.