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University of Southern California Dissertations and Theses
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Utilizing voxel based superimposition to asses orthognathic surgical treatment
(USC Thesis Other) 

Utilizing voxel based superimposition to asses orthognathic surgical treatment

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Abstract (if available)
Abstract Introduction: The accuracy of orthognathic surgery skeletal prediction has been studied in the past.  This study evaluates accuracy of orthognathic surgery skeletal prediction using a novel superimposition method based on a regional, voxel-based approach. ❧ Methods: The pre- and post-surgical cone beam computed tomography (CBCT) records (n=44) of Class III surgical patients were superimposed, and a standard three-dimensional Cartesian coordinate system was defined.  The transverse, anteroposterior, and vertical movement of clinically defined maxillary and mandibular landmarks were calculated based on their pre- and post-surgical positions.  These surgical changes were compared with the predicted movements determined in the model surgery.  A statistical analysis was undertaken to validate landmark identification and the accuracy of the surgical predictions. ❧ Results: We were able to successfully use the voxel based superimposition technique to compare surgical skeletal movements with movements predicted at the time of model surgery.  The difference between actual and planned surgical changes was statistically significant (p < 0.05) for transverse and vertical movement of the maxillary left First Molar and for vertical movement of the maxillary left Canine.  However, the mean differences between actual and planned surgical changes for these statistically significant findings were all less than 0.5 mm. ❧ Conclusions:  The skeletal movements planned at time of model surgery were reproduced surgically with a clinically insignificant level of error.  Utilizing voxel based superimposition and a landmark based treatment outcomes approach allows us to isolate error in a way not available in methods that use cephalometrics or segmentation derived surface models.  The author’s personal experience with the imaging tools utilized in this study was that they provide automated, accurate, and fast superimpositions, which should be seriously considered by those who aim to quantitatively evaluate three-dimensional treatment outcomes. 
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University of Southern California Dissertations and Theses
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University of Southern California Dissertations and Theses 
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Asset Metadata
Creator Alexandroni, Emanuel Stefan (author) 
Core Title Utilizing voxel based superimposition to asses orthognathic surgical treatment 
School College of Letters, Arts and Sciences 
Degree Master of Science 
Degree Program Craniofacial Biology 
Publication Date 04/26/2012 
Defense Date 03/17/2012 
Publisher University of Southern California (original), University of Southern California. Libraries (digital) 
Tag OAI-PMH Harvest,orthodontics,orthognathic surgery,registration,superimposition,voxel based registration 
Language English
Contributor Electronically uploaded by the author (provenance) 
Advisor Sameshima, Glenn T. (committee chair), Enciso, Reyes (committee member), Paine, Michael L. (committee member) 
Creator Email alexandroni@gmail.com 
Permanent Link (DOI) https://doi.org/10.25549/usctheses-c3-12282
Unique identifier UC11288318 
Identifier usctheses-c3-12282 (legacy record id) 
Legacy Identifier etd-Alexandron-649.pdf 
Dmrecord 12282 
Document Type Thesis 
Rights Alexandroni, Emanuel Stefan 
Type texts
Source University of Southern California (contributing entity), University of Southern California Dissertations and Theses (collection) 
Access Conditions The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law.  Electronic access is being provided by the USC Libraries in agreement with the a... 
Repository Name University of Southern California Digital Library
Repository Location USC Digital Library, University of Southern California, University Park Campus MC 2810, 3434 South Grand Avenue, 2nd Floor, Los Angeles, California 90089-2810, USA
Tags
orthodontics
orthognathic surgery
superimposition
voxel based registration