Horizontal changes of the proximal mandibular segment after mandibular setback surgery using 3-dimensional computed tomography data.

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Horizontal changes of the proximal mandibular segment after mandibular setback surgery using 3-dimensional computed tomography data.

Oral Surg Oral Med Oral Pathol Oral Radiol. 2017 Jul 25;:

Authors: Yeo BR, Han JJ, Jung S, Park HJ, Oh HK, Kook MS

Abstract
OBJECTIVES: To evaluate horizontal changes of the proximal mandibular segment after mandibular setback surgery using 3-dimensional computed tomography (3-D CT).
STUDY DESIGN: This study included 66 patients who underwent bilateral sagittal split ramus osteotomy for correction of mandibular prognathism. With the use of 3-D CT data obtained preoperatively (T1), immediately postoperatively (T2), and 6 months postoperatively (T3), horizontal changes of the proximal mandibular segment, including the intercondylar width, the intergonial width, and the frontal-ramal inclination were evaluated.
RESULTS: The value of the right frontal-ramal inclination was 11.43 ± 1.36° at T1, 11.91 ± 1.96° at T2, and 10.7 ± 1.5° at T3. The values of the left frontal-ramal inclination were 6.10 ± 1.03° at T1, 8.17 ± 1.66° at T2, and 7.66 ± 1.65° at T3. The values of the intergonial width were 99.67 ± 1.67 mm at T1, 98.24 ± 1.72 mm at T2, and 97.08 ± 1.71 mm at T3. The intergonial width was significantly decreased at T3 compared with T1 (P < .001). The values of the intercondylar width were 123.51 ± 1.66 mm at T1, 123.9 ± 1.66 mm at T2, and 122.88 ± 1.58 mm at T3.
CONCLUSIONS: Lower facial width at mandibular angle region decreased immediately after mandibular setback surgery and showed further decreases during the postoperative period.

PMID: 28958899 [PubMed - as supplied by publisher]

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