Abstract
Purpose: Skeletal stability after orthognathic surgery remains challenging in Class III malocclusion. This study examined how preoperative mandibular plane angle (FMA) and its surgical changes affect postoperative outcomes.
Patients and Methods: Sixty adult Taiwanese patients with skeletal Class III malocclusion treated by bimaxillary surgery without genioplasty were retrospectively analyzed. Cone-beam computed tomography (CBCT) at preoperative (T0), immediate postoperative (T1), and orthodontic debonding, ≥ 1-year postoperative (T2) stages was used to measure sagittal (Pog-CP), vertical (Me-FH), and transverse (Go–Go) changes. Pearson correlation and multiple regression analyses were performed.
Results: Smaller preoperative FMA and larger increased intraoperative FMA increases were significantly associated with greater sagittal relapses (p < 0.01). Vertical relapses correlated with FMA and Me-FH changes (p < 0.01).
Conclusion: Mandibular plane morphology and its surgical modification critically influence postoperative stability. Accurate assessment and controlled surgical adjustment of the FMA are essential to reduce relapses and improve long-term outcomes in Class III correction.
Recommended Citation
Kuo, Jason Jyun-Cheng; Chen, Min-Chi; Wang, Yu-Chih; and Ko, Ellen Wen-Ching
()
"Predicting Stability and Relapse in Class III Patients: The Role of the Mandibular Plane Angle in Bimaxillary Surgery,"
Taiwanese Journal of Orthodontics: Vol. 37:
Iss.
1, Article 2.
https://doi.org/10.38209/2708-2636.1372
Available at:
https://www.tjo.org.tw/tjo/vol37/iss1/2
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