16 - HHS Public Access Author manuscript Author Manuscript Orthod Craniofac Res Author manuscript available in PMC 2017 May 01 Published in final

16 - HHS Public Access Author manuscript Author...

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Three-dimensional regional displacement after surgical-orthodontic correction of Class III malocclusionL Koerich1, ACO Ruellas2, B Paniagua3, M Styner3, T Turvey4, and LHS Cevidanes51International Dental Program, Virginia Commonwealth University2Department of Orthodontics, University Federal of Rio de Janeiro, Brazil3Departments of Psychiatry and Computer Science, University of North Carolina4Department of Oral and Maxillofacial Surgery, University of North Carolina5Department of Orthodontics, University of MichiganAbstractObjectives—To investigate how displacements of maxillo-mandibular structures are associated with each other at splint removal and one year post-surgery following 1-jaw and 2-jaw surgeries for correction of Class III malocclusion.Setting and Sample Population—Fifty patients who underwent surgical correction with maxillary advancement only (n=25) or combined with mandibular set back (n=25) were prospectively enrolled in this study.Methods—CBCTs were taken pre-surgery, at splint removal and at one year post-surgery. Three-dimensional cranial base superimpositions and shape correspondence were used to measure the outcomes from pre-surgery to splint removal (surgical changes) and splint removal to one year post-surgery (post-surgical adaptations). Pearson correlation coefficients were used to evaluate the association between the regional displacements.Results—Both surgery groups presented mandibular clockwise rotation with surgery and post-surgical adaptive counterclockwise rotation. In patients treated with maxillary advancement only, the surgical changes of the maxilla were significantly correlated with chin changes. The amount/and direction of chin autorotation was significantly correlated with right and left ramus autorotation. Right and left condylar displacements were significantly correlated. One year post-surgery, adaptive displacements/bone remodeling of both rami were correlated to the chin and condylar changes. For the 2-jaw group, the few correlations between the positional and/or remodeling changes in the anatomic regions of interest observed due to the surgery were different than those observed after post-surgical adaptations, suggesting that these changes occurred independently.Conclusion—Our results indicate that surgical displacements and post-surgical adaptations are often correlated in one-jaw surgery and are in general, independent in two-jaw surgery.Corresponding to: Leonardo Koerich, Virginia Commonwealth University, School of Dentistry, International Dental Program, 520 North 12th Street, Richmond, VA 23298-0566, Tel: +1 919 998-9523, l[email protected] [email protected] HHS Public AccessAuthor manuscriptOrthod Craniofac Res. Author manuscript; available in PMC 2017 May 01.

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