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

Bo-Ram Yeo¹, Jeong Joon Han², Seunggon Jung²

¹Graduate Dental School, Chonnam National University, Gwangju, Republic of Korea.

Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

|September 30, 2017

Summary

Mandibular setback surgery reduces lower facial width at the mandibular angle. This decrease is evident immediately after surgery and continues to progress during the postoperative period, as shown by 3-D CT analysis.

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Area of Science:

Oral and Maxillofacial Surgery
Orthognathic Surgery
3D Imaging in Dentistry

Background:

Mandibular prognathism correction often involves mandibular setback surgery.
Understanding the dimensional changes of the proximal mandibular segment is crucial for surgical planning and outcome assessment.

Purpose of the Study:

To evaluate horizontal changes in the proximal mandibular segment after mandibular setback surgery.
To assess changes in intercondylar width, intergonial width, and frontal-ramal inclination using 3-D CT.

Main Methods:

A retrospective study of 66 patients undergoing bilateral sagittal split ramus osteotomy for mandibular prognathism.
3-D CT scans were acquired preoperatively (T1), immediately postoperatively (T2), and 6 months postoperatively (T3).
Horizontal dimensions and angulation of the proximal mandibular segment were analyzed.

Main Results:

The intergonial width significantly decreased at 6 months postoperatively compared to preoperatively (P < .001).
Frontal-ramal inclination showed changes on both sides, with the right side decreasing from T2 to T3 and the left side showing a slight decrease from T2 to T3.
Intercondylar width demonstrated minimal changes throughout the study period.

Conclusions:

Lower facial width at the mandibular angle region decreases immediately after mandibular setback surgery.
Further reduction in lower facial width at the mandibular angle is observed during the postoperative period.