Biomedical journal · 2025
Associations with lip cant and facial midline correction following bimaxillary surgery in class III asymmetry: A CBCT-based analysis.
СтатьяНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
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Lin Chih-Ling, Chen Yun-Fang, Chen Ying-An, Yao Chuan-Fong, Xi Tong, Liao Yu-Fang, Chen Yu-Ray
Аннотация
BACKGROUND: This study evaluated the outcomes of bimaxillary surgery for class III asymmetry and lip cant, and identified factors associated with lip cant and facial midline correction.
MATERIALS AND METHODS: Fifty adult patients (22 females, 28 males; mean age: 24.8 ± 5.1 years) with class III asymmetry and lip cant who underwent bimaxillary surgery were prospectively and consecutively analyzed. Cone-beam computed tomography scans obtained preoperatively and at postoperative follow-up were superimposed to assess surgical jaw movements in six degrees of freedom and their effects on lip cant and facial midline symmetry.
RESULTS: Significant reductions were observed in lip cant (1.6 ± 1.6 mm), lower lip deviation (2.4 ± 1.7 mm), chin deviation (5.8 ± 4.2 mm), and facial midline deviation (9.7 ± 7.2 mm). Multiple linear regression analysis identified mandibular roll correction (β = 0.456, p < 0.01) and pre-treatment lip cant severity (β = 0.394, p < 0.01) as significant factors of lip cant reduction. Additionally, chin shift (β = 0.495, p < 0.01) and mandibular shift (β = 0.461, p < 0.01) were significant factors of facial midline correction.
CONCLUSION: Bimaxillary surgery significantly improved lip cant and facial midline deviation in patients with class III asymmetry and lip cant. Mandibular roll correction and pre-treatment lip cant severity were key factors associated with lip cant correction, while chin and mandibular shift correction were associated with facial midline improvement.
MATERIALS AND METHODS: Fifty adult patients (22 females, 28 males; mean age: 24.8 ± 5.1 years) with class III asymmetry and lip cant who underwent bimaxillary surgery were prospectively and consecutively analyzed. Cone-beam computed tomography scans obtained preoperatively and at postoperative follow-up were superimposed to assess surgical jaw movements in six degrees of freedom and their effects on lip cant and facial midline symmetry.
RESULTS: Significant reductions were observed in lip cant (1.6 ± 1.6 mm), lower lip deviation (2.4 ± 1.7 mm), chin deviation (5.8 ± 4.2 mm), and facial midline deviation (9.7 ± 7.2 mm). Multiple linear regression analysis identified mandibular roll correction (β = 0.456, p < 0.01) and pre-treatment lip cant severity (β = 0.394, p < 0.01) as significant factors of lip cant reduction. Additionally, chin shift (β = 0.495, p < 0.01) and mandibular shift (β = 0.461, p < 0.01) were significant factors of facial midline correction.
CONCLUSION: Bimaxillary surgery significantly improved lip cant and facial midline deviation in patients with class III asymmetry and lip cant. Mandibular roll correction and pre-treatment lip cant severity were key factors associated with lip cant correction, while chin and mandibular shift correction were associated with facial midline improvement.