Date of Graduation

2018

Document Type

Thesis

Degree Type

MS

College

School of Dentistry

Department

Orthodontics

Committee Chair

Peter Ngan

Committee Co-Chair

Chris Martin

Committee Member

Bryan Weaver

Abstract

Background and Objectives: The majority of orthodontists routinely evaluate the amount of maxillary incisor display from a frontal perspective, however they do not regularly evaluate a patient's smiling profile with the teeth visible when diagnosing and treatment planning. This study uses the facial plane Glabella Vertical, a vertical line tangent to the subject's soft glabella, to classify the maxilla's AP position. The purpose of this study is to determine if there is a difference in perceived attractiveness between smiling and repose facial profiles and to identify if there is an esthetically optimal AP position of the maxillary incisors in Caucasian females.;Experimental Design and Methods: A sample of 30 young adult Caucasian females were positioned in adjusted natural head position and a repose profile photograph and a smiling profile photograph were taken with a millimeter ruler aligned with the subject's midsagittal plane. The photographs were uploaded to Microsoft PowerPoint(TM) and the distance from the subject's Glabella Vertical plane and FA point of the maxillary incisor was measured. Six male and 6 female orthodontic faculty/residents and 10 male and 10 female non-orthodontic professionals rated the facial attractiveness of the subjects using a visual analog scale. The data was analyzed using Tukey's test for multiple comparisons, ANOVA, and chi-square analysis.;Results: There was a statistically significant (p < 0.05) difference in perceived attractiveness of repose and smiling profiles in half of the photographed subjects. The subjects with maxillary incisors that lie on Glabella Vertical were rated by orthodontists statistically significantly (p < 0.05) more attractive than subjects with maxillary incisors postioned anterior or posterior to Glabella Vertical. Subjects with incisors that lie on Glabella Vertical or posterior to Glabella Vertical were rated statistically significantly (p < 0.05) more attractive by non-orthodontists than subjects with maxillary incisors positioned anterior to Glabella Vertical.;Conclusions: In some Caucasian females there is a significant difference in perceived attractiveness of repose and smiling profiles. Orthodontists rate maxillary incisors that lie on Glabella Vertical significantly more attractive than maxillary incisors that lie anterior or posterior to Glabella Vertical. Non-orthodontists rate maxillary incisors that lie on Glabella Vertical or lie posterior to Glabella Vertical more attractive than maxillary incisors that are positioned anterior to Glabella Vertical. Non-orthodontists appear to be more tolerant of retruded maxillary incisors from a lateral smiling perspective in Caucasian females.

Download

Share

COinS