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Variables associated with stability after Le Fort I osteotomy for skeletal class III malocclusion
C C Lee1, O Xhori2, R J Tannyhill1
1Department of Oral & Maxillofacial Surgery, Massachusetts General Hospital, Boston, MA, USA.
International Journal of Oral and Maxillofacial Surgery
|March 4, 2021
Summary
Le Fort I osteotomy for Class III malocclusion is generally stable. Greater maxillary advancement independently predicts sagittal relapse, but vertical stability is not significantly affected.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Craniofacial Surgery
Background:
- Class III malocclusion often requires surgical correction.
- Le Fort I osteotomy is a common surgical procedure for maxillary advancement.
- Assessing skeletal stability and relapse is crucial for long-term outcomes.
Purpose of the Study:
- To evaluate the skeletal stability after isolated Le Fort I osteotomy.
- To identify predictors of relapse in patients with Class III malocclusion.
- To determine the long-term stability of the surgical correction.
Main Methods:
- Retrospective cohort study of 92 patients.
- Le Fort I osteotomy performed for Class III malocclusion.
- Serial lateral cephalograms analyzed for skeletal changes at multiple time points.
Main Results:
- Mean maxillary advancement was 6.28mm.
- Sagittal relapse (>2mm) occurred in 8.70% of subjects.
- Vertical relapse (>2mm) occurred in 2.17% of subjects.
- Magnitude of advancement was a predictor of sagittal relapse (P=0.008).
Conclusions:
- Isolated Le Fort I osteotomy is a stable procedure for Class III malocclusion.
- Increased maxillary advancement is an independent risk factor for sagittal relapse.
- No significant predictors for vertical relapse were identified.
