[Clinical results of skeletal class III malocclusion in 11 children aged from 10 to 14 years].
OBJECTIVE
The aim of this study is to investigate the clinical effects of combined protraction facemask and rapid maxillary expansion in the treatment of Class III malocclusion in 11 children aged from 10 to 14 years.


METHODS
The observation group included 11 subjects in late mixed dentition or early permanent dentition, and the control group included 32 subjects in early mixed dentition. Protraction facemask and rapid maxillary expansion device was used and the mean treatment time was 6 months. Cephalometric radiographs were taken at the initiation of treatment (T1) and after 6 months of treatment (T2). In this way,(T2-T1) represented cephalometric changes after the treatment and cephalometric analysis based on a new basecranical reference system was used to compare the changes.


RESULTS
All the subjects had the following changes: the maxilla moved forward,the mandible exhibited a downward and backward rotation and the forward growth was restricted. The overjet correction of the observation group was 5.3mm, 51% of the overjet correction was due to skeletal changes and 49% due to dental changes.9 cases obtained normal overjet and overbite and molar relationship.


CONCLUSIONS
The combination of protraction facemask and rapid maxillary expansion is helpful to the correction of Class III malocclusion in children aged from 10 to 14 years. It can alleviate the degree of deformation,avoid surgery, and improve the relationship between hard and soft tissue.
Wang
Chun-ling
CL
Department of Orthodontics, Shandong Medical University, Jinan 250012, China.
Wang
Yu-ling
YL
Liu
Dong-xu
DX
Kong
Fan-zhi
FZ
Guo
Jie
J