JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES) ›› 2015, Vol. 53 ›› Issue (8): 71-78.doi: 10.6040/j.issn.1671-7554.0.2014.636

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CBCT evaluation of the upper airway morphological changes in skeletal Class Ⅲ malocclusion patients using protraction and rapid maxillary expansion appliance

CHEN Xueling1,2,3, WU Zizhong4, LIU Dongxu1,2, XIE Yongtao5, GUO Tiantian1, ZHANG Shijie3   

  1. 1. Department of Orthodontics, School of Stomatology, Shandong University, Jinan 250012, Shandong, China;
    2. Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan 250012, Shandong, China;
    3. Department of Stomatology, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China;
    4. Department of Stomatology, the 88th Hospital of Chinese People's Liberation Army, Taian 271000, Shandong, China;
    5. Department of Stomatology, Shandong Traditional Chinese Medicine Hospital, Jinan 250012, Shandong, China
  • Received:2014-09-22 Published:2015-08-10

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Abstract: Objective To evaluate the effects of protraction headgear with rapid maxillary expansion (PE) on the upper airway morphological dimensions in growing patients with skeletal Class III malocclusion. Methods The pre-treatment (T1) and post-treatment (T2) cone beam computed tomography (CBCT) data of 30 patients aged 8 to 11 years who had completed PE therapy were collected. After the data were reconstructed and registered, the morphological changes of the upper airway were measured. The t-test was used to assess the statistical differences. Results After the PE treatment, the subspinale (A) of maxillary and upper incisor (UI) moved in the anterosuperior direction. The gnathion (Gn) of mandible moved in the posterior-inferior direction. The placement of the hyoid bone, length and width of dentalarch, volume and mean cross-sectional area of nasopharynx and oropharynx region had significant differences, while the hypopharynx showed no remarkable change. The ratio of the largest anteroposterior/lateral diameter of the oropharynx increased, while that of the hypopharynx decreased. Conclusion The PE treatment of Class Ⅲ malocclusion with maxillary skeletal deficiency produces a significant enlargement in the nasopharynx and oropharynx, but the hypopharynx shows no significant changes. The oropharynx is found to be more circular and the hypopharynx becomes more elliptic in transverse shape.

Key words: Rapid palatal expansion, 3-dimensional virtual model reconstruction, Airway, Protraction headgear, Angle Class III, Cone beam computed tomography

CLC Number: 

  • R783.5
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