Corrective outcome and transverse stability after orthognathic surgery using a surgery-first approach in mandibular prognathism with and without facial asymmetry

Publication date: Available online 5 February 2018
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Jinyuan Guo, Tongyue Wang, Jeong Joon Han, Seunggon Jung, Min-Suk Kook, Hong-Ju Park, Hee-Kyun Oh
ObjectivesTo evaluate corrective outcome and transverse stability after orthognathic surgery via a surgery-first approach (SFA) in mandibular prognathism with and without facial asymmetry using three-dimensional analysis.Study DesignTwenty-nine patients who received mandibular setback surgery using SFA were divided into two groups according to the menton deviation (4 mm): symmetry group (n=17) and asymmetry group (n=12). Using computed tomography images obtained before (T0), immediately after (T1), and 6 months after (T2) surgery, time-dependent changes in variables related to facial asymmetry including maxillary height, ramal length, frontal and lateral ramal inclination, mandibular body length, and mandibular body height were evaluated.ResultsImmediately after surgery, asymmetry group showed significantly decreased discrepancies between longer and non-longer sides for all variables (P < .05); there was no significant differences in discrepancies between the two groups. During the postoperative periods, no significant changes in discrepancies were found in any variable in either group. Compared with T0, the asymmetry group showed significantly decreased discrepancies in ramal length, frontal and lateral ramal inclination, and mandibular body length at T2.ConclusionVariables related to facial asymmetry showed significant improvement after surgical-orthodontic treatment using SFA, and corrected outcomes showed good postoperative stability in both symmetry and asymmetry groups.



http://ift.tt/2BYzTAC