Journal of Jilin University(Medicine Edition) ›› 2019, Vol. 45 ›› Issue (04): 899-904.doi: 10.13481/j.1671-587x.20190427

• Research in clinical medicine • Previous Articles    

Significance of comparison in upper airway morphology and hyoid position between skeletal class Ⅲ malocclusion of high-angle and normal occlusion of adults by cone beam CT

MEI Donglan1, HAN Lichi1, YAN Zhenmei2, HUANG Hongwei3   

  1. 1. Department of Stomatology, College of Medical Sciences, Dalian University, Dalian 116622, China;
    2. Department of Orthodontics, Dalian Stomatology Hospital, Liaoning Province, Dalian 116021, China;
    3. Teaching and Training Center, Army Characteristic Medical Center, Chongqing 400038, China
  • Received:2018-09-24 Published:2019-08-02

Abstract: Objective:To analyze the differents in the upper airway morphology and hyoid position between skeletal class Ⅲ malocclusion of high-angle and normal occlusion by cone beam CT(CBCT), and to study the influence of skeletal class Ⅲ malocclusion of high-angle in the upper airway and hyoid position of the adults preliminarily. Methods:A total of 42 adults in Department of Orthodontics, Dalian Stomatology Hospital were chosen, including 21 adults with skeletal class Ⅲ malocclusion of high-angle and 21 adults with normal occlusion. MIMICS 20.0 software was used to measure the line spacing, cross-sectional area and volume of each upper airway segment and line distance of hyoid of the patients on CBCT; SPSS 20.0 software was used for statistical analysis. Results:Compared with normal occlusion group, the maximum lateral distance (LAT1) of the nasopharynx, the maximum anterior-posterior distance (AP2) of the velopharyngeal, and the volume of the velopharyngeal (VOL2) of the patients in skeletal class Ⅲ malocclusion of high-angle group were increased (P<0.05). Compared with normal occlusion group, the maximum lateral distance of the glossopharynx and laryngopharynx (LAT3 and LAT4), the cross-sectional area of the laryngopharynx (CSA4) and the volume of the laryngopharynx (VOL4) of the patients in skeletal class Ⅲ malocclusion of high-angle group were decreased (P<0.05). While no statistically significant difference was found in the position of the hyoid bone that had a tendency to shift forward and upward of the patients in skeletal class Ⅲ malocclusion of high-angle group compared with normal occlusion group (P>0.05). Conclusion:Cross-sectional area and volume of velopharyngeal have the tendency of increase, but cross-sectional area and volume of laryngopharynx have the tendency of decrease in the patients with skeletal class Ⅲ malocclusion of high-angle. The hyoid bone has a tendency to shift forward and upward in the patients with skeletal class Ⅲ malocclusion of high-angle.

Key words: cone beam CT, skeletal class Ⅲ malocclusion of high-angle, normal occlusion, upper airway, hyoid

CLC Number: 

  • R783