Award Date


Degree Type


Degree Name

Master of Science (MS)


Dental Medicine

First Committee Member

Tanya Al-Talib

Second Committee Member

Robert Danforth

Third Committee Member

Karl Kingsley

Fourth Committee Member

Amei Amei

Number of Pages



Objectives: To compare the airway volume, the airway minimum cross-section area, the airway shape, and the airway related features to vertical growth pattern classifications in subjects with or without excessive daytime sleepiness (EDS). Introduction: The awareness, diagnosis, and management of sleep disordered breathing disorders has grown exponentially in the dental clinical setting. Excessive daytime sleepiness is a potential indicator for OSA. CBCT imaging of the airway and airway related features in patients with or without EDS may provide clinicians with a potential way to screen and detect SDB disorders in our everyday patients.

Materials and Methods: 282 patients from the University of Nevada Las Vegas Orthodontic Clinic (18+ in age, 101 males, 181 females) were classified into three groups based on their vertical skeletal patterns: Hypodivergent (79), normodivergent (143), hyperdivergent (60). Each patient was categorized as high or low risk for EDS based on their responses to the Epworth Sleepiness Scale. CBCT was used to compare the airway volume, minimum cross-section (MCSA), MCSA airway shape, and the airway related skeletal features of each patient.

Results: There were significant differences between the measured minimum cross-sectional area of the airway between patients diagnosed with hyperdivergent and hypodivergent vertical skeletal growth pattern (p

Conclusions: There are significant differences between vertical skeletal classification and minimum cross-sectional airway area and hyoid to mandibular plane measurements. Total airway volume has a positive relationship to the hyoid to mandibular plane measurement. Sleepiness classified by the Epworth Sleepiness Scale was not a significant predictor in airway volume, shape or airway related skeletal features.


Airway; Excessive Daytime Sleepiness (EDS); Hyoid; Obstructive Sleep Apnea (OSA); Vertical



File Format


File Size

1684 KB

Degree Grantor

University of Nevada, Las Vegas




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