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Indian J Dent Res. 2019 May-Jun;30(3):368-374. doi: 10.4103/ijdr.IJDR_526_18.

Relationship of the airway size to the mandible distance in Chinese skeletal Class I and Class II adults with normal vertical facial pattern.

Author information

1
Department of Orthodontics, Institute of Stomatology, Nanjing Medical University, Jiangsu Key Laboratory of Oral Diseases, Nanjing, Jiangsu, China.

Abstract

Objective:

This study aims to evaluate the pharyngeal airway dimensions among Chinese adults in relation to Class I and Class II facial skeletal patterns using three-dimensional cone-beam computed tomography (CBCT) images.

Materials and Methods:

A total of 156 initial CBCT images were evaluated, which were classified into skeletal Class I and Class II according to ANB angle with mean (SD) age being 22.56 ± 4.0 years and 22.32 ± 3.6 years. The pharyngeal airway volume, airway area, minimum cross-sectional area (MCA) and the distance from uvula (tip of the soft palate) to mental spine (U-MS distance) were assessed with Dolphin imaging software.

Results:

Compared with Class I group, Class II group displayed significantly smaller pharyngeal airway volume, airway area and MCA (P <.01, P =0.03, and P =0.008, respectively), and shorter U-MS distance (P <.001). Comparing gender subgroups, the female subgroup showed the smallest airway measurement. Spearman correlation test results showed that the airway volume and area had a significant positive correlation with U-MS distance (r = 0.22, P = 0.005, and r = 0.28, P < 0.005, respectively) and negative correlation with ANB angle (r = -0.23, P = 0.002, and r = -0.21, P = 0.007, respectively).

Conclusions:

Pharyngeal airway volume, airway area, MCA, and the U-MS distance were smaller in skeletal Class II than Class I Chinese adult subjects and lower in female Class II subgroup. Additionally, there was a correlation observed between the mandibular distance (U-MS), ANB angle and airway size.

KEYWORDS:

Adults; cone-beam computed tomography; mandible; pharyngeal airway

PMID:
31397410
DOI:
10.4103/ijdr.IJDR_526_18
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