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Zheng Yuchen
Zheng Yuchen
Republic of Korea
Main Instructor Min-Hee Oh
Department / Institution Department of Orthodontics, School of Dentistry, Chonnam National University
Classification Research report
Objective: To investigate the effect of symmetric and asymmetric mandibular setbacks on short-term changes in condylar position after surgery-first approach.
Materials and Methods: Patients who underwent mandibular setback surgery using the surgery-first approach were selected and divided into symmetry group and asymmetry group. CBCT images were taken before surgery (T0), within one week after surgery (T1), and seven months after surgery (T2). Condylar positions were measured. Positional changes of mandibular condyles according to time were compared between the two groups and correlation analysis was performed.
Results: There were significant condylar displacement over time in both groups. However, these changes showed different patterns. On the lesser setback side, there were significant differences in surgical change (T1-T0) and total change (T2-T0) of condyle angle between the two groups. In the asymmetry group, there was a greater internal rotation of mandibular condyle. Results of correlation analysis revealed that only the setback difference was associated with changes of condyle angle on the lesser setback side at two time points (T1-T0, T2-T0).
Conclusion: In surgery-first patients, significant condylar displacement occurred immediately after surgery in both groups following mandibular setback surgery. Condylar displacement remained partially even at seven months after surgery. More significant displacement was observed following asymmetric mandibular setback.
CBCT-generated Cephalogram Evaluation of Short-term Changes in Condylar Position After Surgery- First Approach