Two methods of treatment for skeletal Class Ⅲ malocclusion on airway changes before and after clinical research
10.12016/j.issn.2096-1456.2021.08.006
- Author:
LIU Li
1
;
ZHOU Yan
2
,
3
;
ZHANG Daling
2
,
3
;
WANG Yuanyuan
2
,
3
Author Information
1. Department of Orthodontics, Affiliated Stomatological Hospital of Guilin Medical University
2. Department of Orthodontics, The People&rsquo
3. s Hospital of Guangxi Zhuang Autonomous Region
- Publication Type:Journal Article
- Keywords:
sagittal diameter of the upper airway;
Class Ⅲ intermaxillary elastics;
microimplant;
skeletal Class Ⅲ malocclusion;
orthodontic treatment;
cephalometric radiographs;
obstructive sleep and hypopnea syndrome;
mandibular plane angle
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2021;29(8):541-547
- CountryChina
- Language:Chinese
-
Abstract:
Objective : To investigate the changes in the sagittal diameter of the upper airway before and after the treatment of skeletal Class Ⅲ malocclusion in adults with microimplant anchorage and class Ⅲ intermaxillary elastics and to provide a reference for clinical treatment.
Methods :A total of 35 adult patients with skeletal Class Ⅲ malocclusion were selected to be treated with the straight-wire technique. Microimplant group, 15 cases (group A): patients with severe skeletal Class Ⅲ malocclusion (vertical high angle) were treated with the straight-wire technique combined with microimplant anchorage; class Ⅲ intermaxillary elastics group, 20 cases (group B): Patients with mild or moderate skeletal Class Ⅲ malocclusion (vertical low angle and average angle) were treated with the straight-wire technique combined with class Ⅲ intermaxillary elastics, and cephalometric radiographs obtained before and after treatment in the upper airway in the two groups were measured and analyzed.
Results :Changes in cranial and maxillofacial measurements after correction: in group A, (sella-nasion-supramental angle) the SNB angle decreased significantly (P < 0.05), and (subspinale-nasion-supramental angle) the ANB angle increased significantly (P < 0.05). In group B, the SNB angle decreased significantly (P < 0.05), while (subspinale-nasion-subspinale angle) the SNA angle、ANB angle and anterior skull base plane-mandibular plane angle (Sn-MP) angle increased significantly (P < 0.05). Changes in sagittal diameter of the upper airway measurements after corrections: In group A, the width of the glossopharyngeal segment of the upper airway (TB-TPPW) decreased significantly (P < 0.05). In group B, first segment width of the upper airway behind the hard palate (PNS-R) increased significantly (P < 0.05). After correction, the decreased SNB and increased ANB in group A was higher than that in group B, and the difference was statistically significant （P < 0.05）. The decreased of TB-TPPW in upper airway of group A was greater than that of group B, and the difference was statistically significant （P < 0.05）.
Conclusions :In the treatment of skeletal class Ⅲ malocclusion with microimplant anchorage, the sagittal diameter of the glossopharyngeal segment of the upper airway has a negative impact.
- Full text:两种方法矫治骨性Ⅲ类错牙合前、后上气道变化的临床研究.pdf
