Sleep disruption and premolar absence, NHANES, 2017-2020: A cross-sectional study.

Objective: Orthodontic treatment often involves four first premolar extractions. There is concern that the retraction of the anterior teeth due to extraction of first premolars may constrict tongue space and will reduce oral cavity and oropharynx space. Constricted airways are often associated with sleep disordered breathing (SDB) and sleep disruption. The aim of this study was to determine if there is an association of SDB factors with the absence of first premolars.

Methods: A cross-sectional study was conducted using National Health and Nutrition Examination Survey (NHANES) 2017-March 2020 data on participants, aged 18-65 years (n = 4742). Variables of interest included self-reports of SDB (symptoms of disrupted sleep such as snoring, snorting, daytime sleepiness, and inappropriate number of hours of sleep). Data for the presence/absence of first premolars were gathered from the oral examination section of NHANES. An assumption was made that absence of four first premolars in dentate participants indicated extractions for orthodontic treatment. Data analyses were conducted with Rao Scott chi squared test.

Results: There were no significant associations of SDB and symptoms of disrupted sleep associated with the absence of four first premolars in dentate participants.

Conclusion: Concerns of the impact of first premolar extractions on SDB were not supported with this study.