Effect of setback Le Fort I osteotomy on midfacial soft-tissue changes as evaluated by cone-beam computed tomography superimposition for cases of skeletal Class III malocclusion.

Abstract	This study employed the cone-beam computed tomography (CBCT) superimposition method to evaluate postoperative midfacial soft-tissue changes in cases of skeletal Class III malocclusion after double-jaw surgery with setback and vertical reduction Le Fort I osteotomy. A retrospective study was carried out on 15 patients who had undergone maxillary setback Le Fort I osteotomy and mandibular setback sagittal split ramus osteotomy with alar cinch suturing and V-Y soft-tissue closure. Three dimensional CBCT volume scans were recorded preoperatively (T0) and 6 months postoperatively (T1) to measure soft-tissue changes of the upper lip and midface. Post-surgery, soft-tissue landmarks in the cheek and paranasal areas had moved forward; the soft-tissue thickness at the A-point had markedly increased (P<0.05); there was no significant change in the subnasale, and the midline of the soft-tissue of the upper-lip area had moved backward. The extent of the mean soft-tissue change at the labrale superius was greater than that at the other soft-tissue landmarks of the upper lip. The results suggest that maxillary setback movement of the maxilla by alar cinch suturing has a beneficial effect on paranasal soft-tissue and lip contours for patients with protrusive lip and acute nasolabial angle.
Authors	J-Y Lee, Y-I Kim, D-S Hwang, S-B Park
Journal	International journal of oral and maxillofacial surgery (Int J Oral Maxillofac Surg) Vol. 42 Issue 6 Pg. 790-5 (Jun 2013) ISSN: 1399-0020 [Electronic] Denmark
PMID	23294855 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Copyright	Copyright © 2012 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.
Topics	Adult Cephalometry Cone-Beam Computed Tomography (methods) Face (anatomy & histology) Female Humans Male Malocclusion, Angle Class III (diagnostic imaging, surgery) Mandible (surgery) Maxilla (surgery) Nasolabial Fold (anatomy & histology) Osteotomy, Le Fort Osteotomy, Sagittal Split Ramus Retrospective Studies Subtraction Technique Suture Techniques Treatment Outcome Young Adult

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