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Advisory Committee Chair

Nada Souccar

Advisory Committee Members

Luther Cale

Amjad Javed

Christos Vlachos

Document Type

Thesis

Date of Award

2022

Degree Name by School

Master of Science (MS) School of Dentistry

Abstract

Objective: The objective of this study is to investigate the relationship of forehead inclination to anteroposterior position (AP) of the maxillary central incisors in adult Hispanic females. Materials and Methods: 70 participants were recruited for this study and smiling profile photographs were taken. All images were deidentified and placed in standardized dimension of 7.5” by 6.5”, which were then added to a PowerPoint to be evaluated by a judging panel. 24 Adult Hispanic Females (AHF) made up the control group and were seen to have an optimal incisor AP position. 46 AHF were in the study group and were judged to not have an optimal incisor AP position. The forehead inclination and AP position of the maxillary incisors were measured. Results: For the control group the average AP position for the maxillary incisors in relation to Glabella Vertical (GV) was 8.40mm ± 6.94mm in front of GV. For the study group the average AP position for the maxillary incisors in relation to Glabella Vertical (GV) was 7.23mm ± 8.38mm ahead of GV. A strong positive correlation was found between forehead inclination and AP maxillary incisor position in AHF for both the control and study groups. Conclusion: The clinical forehead is an easily discernible and reliable landmark and can be used when determining AP positions of maxillary incisors in AHF. Different ethnicities will show different iii variations in the correlation between forehead inclination and incisor position. A strong positive correlation was seen between forehead inclination and maxillary incisor position. An equation derived from the regression analysis aids in predicting the anterior limit for a maxillary incisor in AHF. For most AHF the GV should not be exceeded as a posterior limit for the maxillary incisors.

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