Karacay Seniz, Gokce Sila, Yildirim Ersin
Section of Orthodontics, Gulhane Military Medical Academy, Haydarpasha Education Hospital, Istanbul, Turkey.
Korean J Orthod. 2012 Dec;42(6):318-28. doi: 10.4041/kjod.2012.42.6.318. Epub 2012 Dec 28.
To assess the position and movements of the hyoid bone during deglutition in patients with open bite.
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.
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.
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.
评估开颌患者吞咽过程中舌骨的位置和运动。
根据是否存在前牙开颌将36名受试者分为2组。开颌组(OBG)和对照组各有18名患者,平均覆颌分别为-4.9±1.9毫米和1.9±0.7毫米。通过测量舌骨的垂直和水平运动来评估吞咽4个阶段中舌骨的位置。
组间和阶段间的交互作用对测量结果无显著影响(p>0.05)。然而,当分别评估组和阶段时,它们对测量结果有显著影响(p<0.001)。在开颌组中,舌骨位置更靠下和靠后,且在吞咽阶段一直保持该位置。
吞咽过程中,舌骨在口腔期到达最前位置,在咽期到达最高位置。开颌不改变吞咽过程中舌骨的移位模式。由于舌骨上肌群张力释放,开颌患者的舌骨位置更靠下和靠后。