Horizontal changes of the proximal mandibular segment after mandibular setback surgery using 3D CT data

Publication date: Available online 25 July 2017
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Bo-Ram Yeo, Jeong-Joon Han, Seunggon Jung, Hong-Ju Park, Hee-Kyun Oh, Min-Suk Kook
Objectives.To evaluate horizontal changes of the proximal mandibular segment after mandibular setback surgery using three-dimensional computed tomography (3D CT).Study Design.This study included 66 patients who underwent bilateral sagittal split ramus osteotomy (BSSRO) for correction of mandibular prognathism Using 3D CT data obtained preoperatively (T1), immediately postoperatively (T2), and 6 months postoperatively (T3), horizontal changes of the proximal mandibular segment including intercondylar width (ICW), intergonial width (IGW), and frontal-ramal inclination (FRI) were evaluated.Results.The value of right-FRI was 11.43 ± 1.36° at T1, 11.91 ± 1.96° at T2, and 10.7 ± 1.5° at T3. The values of left-FRI were 6.10 ± 1.03° at T1, 8.17 ± 1.66° at T2, and 7.66 ± 1.65° at T3. The values of IGW were 99.67 ± 1.67 mm at T1, 98.24 ± 1.72 mm at T2, and 97.08 ± 1.71 mm at T3. IGW was significantly decreased at T3 compared with T1 (p < 0.001). The values of ICW were 123.51 ± 1.66 mm at T1, 123.9 ± 1.66 mm at T2, and 122.88 ± 1.58 mm at T3.Conclusion.Lower facial width at mandibular angle region decreased immediately after mandibular setback surgery and showed further decreases during the postoperative period.



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