title: Evaluation of hyoid bone movements in subjects with open bite: a study with real-time balanced turbo field echo cine-magnetic resonance imaging.
abstract: OBJECTIVE
  To assess the position and movements of the hyoid bone during deglutition in patients with open bite.
  
  
  METHODS
  Thirty-six subjects were divided into 2 groups according to the presence of anterior open bite. The open bite group (OBG) and control group each comprised 18 patients with a mean overbite of -4.9 ± 1.9 mm and 1.9 ± 0.7 mm. The position of the hyoid bone during the 4 stages of deglutition was evaluated by measuring vertical and horizontal movement of the bone.
  
  
  RESULTS
  Interactions of group and stage showed no significant effect on the measurements (p > 0.05). However, when group and stage were evaluated individually, they showed significant effects on the measurements (p < 0.001). In OBG, the hyoid bone was more inferiorly and posteriorly positioned, and this position continued during the deglutition stages.
  
  
  CONCLUSIONS
  The hyoid bone reaches the maximum anterior position at the oral stage and maximum superior position at the pharyngeal stage during deglutition. Open bite does not change the displacement pattern of the bone during deglutition. The hyoid bone is positioned more inferiorly and posteriorly in patients with open bite because of released tension on the suprahyoid muscles.
authors: Section of Orthodontics, Gulhane Military Medical Academy, Haydarpasha Education Hospital, Istanbul, Turkey.
authors: Seniz
authors: S
authors: Karacay
authors: Sila
authors: S
authors: Gokce
authors: Ersin
authors: E
authors: Yildirim
keywords: Dentofacial anomalies; Magnectic resonance imaging