Influence of differences in mandibular incisor inclination on skeletal stability after orthognathic surgery in patients with skeletal class III malocclusion - 22/12/23
Highlights |
• | Skeletal class Ⅲ malocclusion patients with proclined inclination of mandibular incisor showed a negative overbite tendency after orthognathic surgery. |
• | Proclined IMPA both pre- and postoperatively was correlated with mandibular relapse. |
• | FMA at T0 and T1 was not associated with mandibular relapse. |
Abstract |
Objective: The preoperative inclination angle of mandibular incisors was crucial for surgical and postoperative stability while the effect of proclined mandibular incisors on skeletal stability has not been investigated. This study aimed to evaluate the effects of differences in presurgical mandibular incisor inclination on skeletal stability after orthognathic surgery in patients with skeletal Class III malocclusion.
Methods: A retrospective cohort study of 80 consecutive patients with skeletal Class III malocclusion who underwent bimaxillary orthognathic surgery was conducted. According to incisor mandibular plane angle (IMPA), patients were divided into 3 groups: retroclined inclination (IMPA < 87°), normal inclination (87° ≤ IMPA < 93°) and proclined inclination (IMPA ≥ 93°). Preoperative characteristics, surgical changes and postoperative stability were compared based on lateral cephalograms obtained 1 week before surgery (T0), 1 week after surgery (T1), and at 6 to 12 months postoperatively (T2).
Results: The mandible demonstrated a forward and upward relapse in all three groups. No significant differences in skeletal relapse were observed in the 3 groups of patients. However, the proclined inclination group showed a negative overbite tendency postoperatively compared with the other two groups and a clinically significant mandibular relapse pattern. Proclined IMPA both pre- and postoperatively was correlated with mandibular relapse.
Conclusion: Sufficient presurgical mandibular incisor decompensation was of crucial importance for the maintenance of skeletal stability in patients with skeletal Class III malocclusion who subsequently underwent orthognathic surgery.
Le texte complet de cet article est disponible en PDF.Keywords : Malocclusion, angle class III, Orthognathic surgery, Stability, Decompensation, IMPA
Plan
Vol 125 - N° 4
Article 101747- septembre 2024 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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