title: 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.affiliation: Department of Oral & Maxillofacial Surgery, Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea.
authors.forename: J-Y
authors.initials: JY
authors.lastname: Lee
authors.forename: Y-I
authors.initials: YI
authors.lastname: Kim
authors.forename: D-S
authors.initials: DS
authors.lastname: Hwang
authors.forename: S-B
authors.initials: SB
authors.lastname: Park
mesh_terms: D000328:Adult; D002508:Cephalometry; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D005145:Face / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging* / Q000601:surgery*; D008334:Mandible / Q000601:surgery*; D008437:Maxilla / Q000601:surgery*; D060052:Nasolabial Fold / Q000033:anatomy & histology; D019340:Osteotomy, Le Fort; D059229:Osteotomy, Sagittal Split Ramus; D012189:Retrospective Studies; D013382:Subtraction Technique; D013536:Suture Techniques; D016896:Treatment Outcome; D055815:Young Adult