Abstract
Background: Segmental Le Fort I osteotomy is a predictable, well-established surgical technique that is commonly used to correct maxillary transverse discrepancies up to 6–7 mm in adults. However, transverse expansion of the maxilla with a segmental Le Fort I osteotomy is often associated with postsurgical instability and relapse. Different methods have been recommended to reduce the potential for transverse instability involving bone grafts or allografts at the palatal osteotomy site, use of palatal bars and expanders, interocclusal splints and transpalatal bone-anchored devices. However, transverse maxillary expansion with a segmental Le Fort I osteotomy is still considered the least stable surgical orthognathic procedure and overexpansion with stable fication method frequently recommended.
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