Radiographic studies of the hyoid bone and cervical spine in Angle Class I and Class II/2nd Division malocclusions

Abstract Introduction Interdisciplinary investigative study of the stomatognathic-cervical complex, necessary to understand the structure and biomechanics of the hyoid bone and cervical spine in Class I and II / 2nd Division participants. Objective To analyze the position of the hyoid bone and the curvature of the cervical spine on lateral radiographs of participants with Class I and II/2nd Division Angle malocclusion. Material and method We evaluated the position of the hyoid bone from its alignment with the corresponding cervical vertebra. The presentation of curvature of the cervical spine was evaluated from the fourth cervical vertebra. Result There was a statistically significant difference in the position of the hyoid bone (p=0.027) between the classes, which was located at C3 in Class I and further down, between C3 and C5, in Class II/2nd Division. The cervical spine showed alterations in both classes, with an increase, rectification, and inversion of the curvature with no statistical difference between them (p=0.533). Conclusion In this study, the hyoid bone showed different positions in the malocclusions studied, however, poor posture of the cervical spine was common in both classes.

摘要 引言
本研究为口颌颈复合体（stomatognathic-cervical complex）的跨学科调查研究，旨在明确安氏I类与II类2分类受试者的舌骨（hyoid bone）及颈椎（cervical spine）的结构与生物力学特性。
目的
分析安氏错𬌗（Angle malocclusion）I类、II类2分类受试者颈椎X线侧位片（lateral radiographs）上的舌骨位置与颈椎曲度。
材料与方法
本研究通过舌骨与对应颈椎的对齐关系评估舌骨位置，并从第4颈椎层面评估颈椎曲度的表现。
结果
两组受试者的舌骨位置存在统计学显著性差异（p=0.027）：安氏I类组舌骨位置对应C3水平，安氏II类2分类组舌骨位置更靠下，处于C3至C5区间。两组受试者的颈椎均出现曲度异常，表现为曲度增大、变直及反弓，但组间差异无统计学意义（p=0.533）。
结论
本研究显示，所纳入的两类错𬌗畸形受试者的舌骨位置存在差异，但两组均普遍存在颈椎姿势不良的问题。