Document Type

Thesis

Date of Degree

Spring 2017

Access Restrictions

Access restricted until 07/13/2018

Degree Name

MS (Master of Science)

Degree In

Orthodontics

First Advisor

Nathan E. Holton

Abstract

Introduction: The hyperdivergent facial form is typically characterized by a long lower anterior facial height (LAFH), steep mandibular plane angle, and skeletal open bite. The purpose of our study was to further explore morphologic variation within long LAFH subjects using geometric morphometric methods. Methods: Cephalograms of 147 individuals (n= 147; 87 female, 60 male; age range: 16-68 years) with LAFH to total anterior facial height (TAFH), ratio (LAFH/TAFH), at or above 57.4% were studied. Cluster analysis and canonical variate analysis captured phenotypic variation and identified homogenous groups. Results: Cluster analysis resulted in three discrete long LAFH phenotypes that varied along vertical and anteroposterior dimensions. Conclusions: We found significant morphologic variation within the sample population of long LAFH individuals. Three phenotypes with varied vertical and anteroposterior discrepancies were revealed through the cluster analysis. Within our sample, we found both convergent and divergent facial patterns with concomitant cranial base rotation and posterior ramal border displacement. Vertical variation was largely independent of anteroposterior discrepancies.

Keywords

facial height, hyperdivergence, hyperdivergent, open-bite, vertical

Pages

vii, 39 pages

Bibliography

Includes bibliographical references (pages 36-39).

Copyright

Copyright © 2017 Kate Elizabeth Finlen

Available for download on Friday, July 13, 2018

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