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Nasolabial morphologic changes after a Le Fort I osteotomy: a three-dimensional anthropometric study.

Tomohiro Yamada¹, Katsuaki Mishima, Norifumi Moritani

¹Department of Oral and Maxillofacial Surgery, Kochi Medical School, Kochi University, Kochi 783-8505, Japan. tyamada@kochi-u.ac.jp

The Journal of Craniofacial Surgery

|July 9, 2010

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Le Fort I osteotomy can cause nasal alar widening due to muscle release. Labial changes are linked to jawbone movement, not flattening, and nasal changes are independent of maxillary advancement direction.

Area of Science:

Oral and Maxillofacial Surgery
Plastic Surgery
3D Imaging Technology

Background:

Le Fort I osteotomy is a surgical procedure to correct midface deformities.
Undesirable nasal and labial changes can occur post-surgery.
Accurate 3D assessment is crucial for understanding these morphologic alterations.

Purpose of the Study:

To conduct a 3D evaluation of nasal and labial morphologic changes after Le Fort I osteotomy.
To utilize a 3D laser scanner for precise facial measurements.
To compare surgical outcomes with a control group.

Main Methods:

Selected 12 female patients undergoing Le Fort I osteotomy with bilateral sagittal split ramus osteotomy.
Captured 3D facial morphology immediately and 6 months post-surgery using a 3D laser scanner.

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Analyzed data using 3D image software, including landmark analysis, curvature assessment, and visual comparison.

Main Results:

Common observation of lateral expansion of nasal alae post-surgery.
Labial changes primarily related to jawbone movement; no significant flattening detected.
No correlation found between nasal changes and the direction of maxillary advancement.

Conclusions:

Nasal morphologic changes post-Le Fort I osteotomy mainly involve nasal alar widening.
This widening results from muscle insertion release and retraction.
The direction of maxillary movement does not influence these nasal changes.