Abstract

TREATMENT EFFECTS OF INCISOR POSITIONING ON ANTERIOR TOOTH DISPLAY By Scott J. Eberle, DMD A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Comn~onwealth University. Virginia Commonwealth University, 2006 Major Director: Steven J. Lindauer, DMD, MDSc Chair of the Department of Orthodontics The purpose of this study was to determine the effect of changes in maxillary incisor position on anterior tooth display (ATD) in adult (n = 21) and adolescent (n = 38) orthodontic patients. The effects of anterior-posterior, vertical, and angular changes of the maxillary central incisor position during orthodontic treatment were evaluated relative to changes in the amount of ATD measured from pretreatment (TI) and posttreatment (T2) lateral cephalometric radiographs of existing patient records. vii Results showed a significant relationship between starting ATD and ATD change during treatment for both adults (P = ,006) and adolescents (P < .0001). In adults, there were significant correlations between vertical (P = .047) and angular (P = .017) changes and ATD, but no significant relationship between anterior-posterior movement and ATD. No correlation was found between maxillary incisor anteriorposterior, vertical or angular changes and ATD in adolescents. CHAPTER

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