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Advisory Committee Chair

Nada Souccar

Advisory Committee Members

Chung How Kau

Christos Vlachos

Amjad Javed

Document Type

Thesis

Date of Award

2015

Degree Name by School

Master of Science in Dentistry (MScD) School of Dentistry

Abstract

Objective: Determine the optimal anteroposterior (AP) relationship of the maxillary central incisors to the forehead in adult African American females (AAF). Materials and Methods: Smile profile photographs of 48 AAF with optimal AP incisor positions (control); 49 seeking/wanting orthodontic treatment (Group 1), and 53 not seeking/wanting treatment (Group 2) were acquired. All images were scaled to life-size and printed. The AP position of the maxillary central incisors and forehead inclination were measured relative to reference lines. Results: The mean AP position of the maxillary central incisors relative to Glabella Vertical (GV) for the controls was 8.58 ± 3.96 mm ahead of GV. The mean AP position for Group 1 was 11.3 ± 4.32mm ahead of GV. The mean AP position for Group 2 was 11.1 ± 4.65 mm ahead of GV. For controls, a strong correlation between the AP position of the maxillary central incisors and forehead inclination was found. Conclusion: The forehead is a reliable landmark for AP maxillary incisor positioning in the AAF population seeking improved facial harmony. A prediction equation for the optimal positioning of the upper incisor for AAF is proposed. The AP relationship of the upper central incisor to the forehead varies with ethnic background.

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