title: One-year assessment of surgical outcomes in Class III patients using cone beam computed tomography.
abstract: The purpose of this study was to apply a novel method to evaluate surgical outcomes at 1 year after orthognathic surgery for Class III patients undergoing two different surgical protocols. Fifty patients divided equally into two groups (maxillary advancement only and combined with mandibular setback) had cone beam computed tomography (CBCT) scans taken pre-surgery, at splint removal, and at 1-year post-surgery. An automatic cranial base superimposition method was used to register, and shape correspondence was applied to assess, the overall changes between pre-surgery and splint removal (surgical changes) and between splint removal and 1-year post-surgery at the end of orthodontic treatment (post-surgical adaptations). Post-surgical maxillary adaptations were exactly the same for both groups, with 52% of the patients having changes >2mm. Approximately half of the post-surgical changes in the maxilla for both groups were vertical. The two-jaw group showed significantly greater surgical and post-surgical changes in the ramus, chin, and most of the condylar surfaces (P<0.05). Post-surgical adaptation on the anterior part of the chin was also more significant in the two-jaw group (P<0.05). Regardless of the type of surgery, marked post-surgical adaptations were observed in the regions evaluated, which explain the adequate maxillary-mandibular relationship at 1-year post-surgery on average, with individual variability.
authors: Department of Orthodontics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. lkoerich@gmail.com
authors: L K
authors: LK
authors: de Paula
authors: A C O
authors: AC
authors: Ruellas
authors: B
authors: B
authors: Paniagua
authors: M
authors: M
authors: Styner
authors: T
authors: T
authors: Turvey
authors: H
authors: H
authors: Zhu
authors: J
authors: J
authors: Wang
authors: L H S
authors: LH
authors: Cevidanes
mesh_terms: D000328:Adult; D002508:Cephalometry; D002680:Chin / Q000000981:diagnostic imaging; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging* / Q000601:surgery*; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery*; D008335:Mandibular Condyle / Q000000981:diagnostic imaging; D008437:Maxilla / Q000000981:diagnostic imaging / Q000601:surgery*; D056948:Orthognathic Surgical Procedures / Q000379:methods*; D017063:Outcome Assessment, Health Care; D010516:Periodontal Splints; D011446:Prospective Studies; D055502:Secondary Prevention; D013382:Subtraction Technique; D055815:Young Adult
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