HERBST EFFECTS ON PHARYNGEAL AIRWAY VENTILATION
Sato, Hideo Kagoshima University
Suga, Hokuto Kagoshima University
Minami, Ayaka Kagoshima University
Yamamoto, Yuushi Kagoshima University
Takemoto, Yoshihiko Kagoshima University
Inada, Emi Kagoshima University
Saitoh, Issei Niigata University
Yamasaki, Youichi Kagoshima University
Cone-beam computed tomography
Computational fluid dynamics
Obstructive sleep apnea
Objective: To evaluate the effect of a Herbst appliance on ventilation of the pharyngeal airway (PA) using computational fluid dynamics (CFD).
Materials and Methods: Twenty-one Class II patients (10 boys; mean age, 11.7 years) who required Herbst therapy with edgewise treatment underwent cone-beam computed tomography (CBCT) before and after treatment. Nineteen Class I control patients (8 boys; mean age, 11.9 years) received edgewise treatment alone. The pressure and velocity of the PA were compared between the groups using CFD based on three-dimensional CBCT images of the PA.
Results: The change in oropharyngeal airway velocity in the Herbst group (1.95 m/s) was significantly larger than that in the control group (0.67 m/s). Similarly, the decrease in laryngopharyngeal airway velocity in the Herbst group (1.37 m/s) was significantly larger than that in the control group (0.57 m/s).
Conclusion: The Herbst appliance improves ventilation of the oropharyngeal and laryngopharyngeal airways. These results may provide a useful assessment of obstructive sleep apnea treatment during growth.
The Angle Orthodontist
The EH Angle Education and Research Foundation
Open Access Journal
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