[Treatment of Class II division 1 extraction cases by use of edgewise technique].
OBJECTIVE
To treat class II division 1 extraction cases by means of Edgewise technique.


METHODS
27 skeletal class II division 1 malocclusion patients were extracted 2 upper first premolars and 2 lower second premolars, and treated by Edgewise principles and sequential force system. They aged from 11 to 20. The duration of orthodontic treatment was 25.5 months on average(22-28 months).


RESULTS
The patients' profile was much improved; Molar relation changed from class II to class I relationship; Anterior overjet and overbite are normal; Good occlusal intercuspation is also achieved. The ANB angle was significantly changed from 5.6 degrees +/- 2.2 degrees to 3.2 degrees +/- 1.4 degrees; Z angle was altered from 60.8 degrees +/- 5.8 degrees to 76.4 degrees +/- 6.6 degrees; Distance of AO-BO was reduced from 6.8 +/- 2.4 mm to 3.2 +/- 1.1 mm.


CONCLUSIONS
Edgewise technique is an effective method for treatment of class II division 1 extraction cases.
Duan
Y
Y
Department of Orthodontics, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China.
Zhang
Y
Y
Sun
Y
Y
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D014081:Tooth Extraction / Q000379:methods*