Kim Seong-Sik, Kim Sung-Hun, Kim Yong-Il, Park Soo-Byung
Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Korea.
Korean J Orthod. 2023 Mar 25;53(2):99-105. doi: 10.4041/kjod22.077.
The study aimed to evaluate the changes in mandibular width after sagittal split ramus osteotomy (SSRO) in patients with mandibular asymmetric prognathism using cone-beam computed tomography (CBCT).
Seventy patients who underwent SSRO for mandibular setback surgery were included in two groups, symmetric (n = 35) and asymmetric (n = 35), which were divided according to the differences in their right and left setback amounts. The mandibular width was evaluated three-dimensionally using CBCT images taken immediately before surgery (T1), 3 days after surgery (T2), and 6 months after surgery (T3). Repeated measures analysis of variance was applied to verify the differences in mandibular width statistically.
Both groups showed a significant increase in the mandibular width at T2, followed by a significant decrease at T3. No significant difference was observed between T1 and T3 in any of the measurements. No significant differences were found between the two groups ( > 0.05).
After mandibular asymmetric setback surgery using SSRO, the mandibular width increased immediately but returned to its original width 6 months after surgery.
本研究旨在使用锥形束计算机断层扫描（CBCT）评估下颌骨不对称前突患者行矢状劈开下颌支截骨术（SSRO）后下颌骨宽度的变化。
70例行SSRO下颌后缩手术的患者被纳入两组，对称组（n = 35）和不对称组（n = 35），根据左右后缩量的差异进行分组。使用术前即刻（T1）、术后3天（T2）和术后6个月（T3）拍摄的CBCT图像对下颌骨宽度进行三维评估。采用重复测量方差分析对下颌骨宽度的差异进行统计学验证。
两组在T2时下颌骨宽度均显著增加，随后在T3时显著减小。在任何测量中，T1和T3之间均未观察到显著差异。两组之间未发现显著差异（> 0.05）。
使用SSRO进行下颌骨不对称后缩手术后，下颌骨宽度立即增加，但在术后6个月恢复到原始宽度。
