[A comparative study on clinical effectiveness of activator and Headgear-Activator].
OBJECTIVE
Compare the effects of Activator and Headgear-Activator on growing patients with Class II malocclusion.


METHODS
The material consisted of 36 pairs of cephalograms, among which 12 cases were treated with Activator, 17 cases with Headgear-Activator and 9 cases without treatment for control. A reference grid was created to evaluate the skeletal and dental changes quantitatively.


RESULTS
Activator and Headgear-Activator were effective on the correction of Class II malocclusion, but the mechanisms were different.


CONCLUSIONS
Both appliances were effective on the correction of skeletal Class II malocclusion of growing patients. By using the headgear, the inhabitation of forward and downward growth of the maxilla was enhanced, and the dental-alveolar changes different from Activator treatment benefit for the improvement of the dental facial appearance of the patient.
Department of Orthodontics, Shanghai Second Medical University, Ninth People's Hospital, Shanghai 200011, China. ly018697@online.sh.cn
Qing-ling
QL
You
Wei
W
Chen