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    GEOMETRIC MORPHOMETRICS CLUSTERS CRANIOFACIAL MORPHOLOGY DIFFERENTLY THAN TRADITIONAL CEPHALOMETRIC MEASUREMENTS

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    Genre
    Thesis/Dissertation
    Date
    2014
    Author
    Carpiaux, Weston
    Advisor
    Sciote, James J.
    Committee member
    Godel, Jeffrey H.
    Tellez Merchán, Marisol
    Weinberg, Seth
    Department
    Oral Biology
    Subject
    Morphology
    Developmental Biology
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/2664
    
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    DOI
    http://dx.doi.org/10.34944/dspace/2646
    Abstract
    Objectives: The purpose of the study was to compare a geometric morphometric approach for grouping different skeletal malocclusions to a traditional cephalometric approach for a subject population undergoing orthognathic surgery for treatment of malocclusion. Methods: Traditional cephalometric measurements were used to diagnose the skeletal malocclusion each subject in both the sagittal (SNA, SNB, ANB, Facial Angle) and vertical dimensions (SN-MP, FMA, Downs Y-Axis, Facial Axis, P-A Face Height). These were compared to skeletal diagnoses given by the treating surgeon. Lastly, geometric morphometrics was used to identify shape variance within the population, cluster homogeneous subsets, and identify variance between the clusters. Results: Traditional cephalometric analysis identified 21 Class II open, 18 Class II normal, 5 Class II deep, 3 Class I open, 4 Class I normal, 2 Class I deep, 2 Class III open, 4 Class III normal, 3 Class III deep. The surgeon identified 17 Class II open, 20 Class II normal, 13 Class II deep, 1 Class I open, 0 Class I normal, 0 Class I deep, 4 Class III open, 3 Class III normal, 4 Class III deep. Geometric morphometrics identified 6 clusters showing greatest variance through 1) vertical divergence, 2) sagittal positioning of the jaws, and 3) ramus height. Conclusion: Cephalometric analysis and a geometric morphometrics approaches to classification of malocclusion grouped subjects into distinct populations. However, the groupings did not agree between the two approaches.
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