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One-year Assessment of Surgical Outcomes in Class III Patients using Cone Beam Computed Tomography

Institution:
Department of Orthodontics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. lkoerich@gmail.com
Publisher:
Elsevier Science
Publication Date:
Jun-2013
Journal:
Int J Oral Maxillofac Surg
Volume Number:
42
Issue Number:
6
Pages:
780-9
Citation:
Int J Oral Maxillofac Surg. 2013 Jun;42(6):780-9.
PubMed ID:
23403336
PMCID:
PMC3970766
Keywords:
stability, Class III, orthognathic surgery
Appears in Collections:
NA-MIC
Sponsors:
K23 DE017727/DE/NIDCR NIH HHS/United States
R01 DE005215/DE/NIDCR NIH HHS/United States
R03 DE018962/DE/NIDCR NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
Koerich de Paula L., Ruellas A.C., Paniagua B., Styner M., Turvey T., Zhu H., Wang J., Cevidanes L.H. One-year Assessment of Surgical Outcomes in Class III Patients using Cone Beam Computed Tomography. Int J Oral Maxillofac Surg. 2013 Jun;42(6):780-9. PMID: 23403336. PMCID: PMC3970766.
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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.

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