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[Treatment of Class II division 1 extraction cases by use of edgewise technique]
1Department of Orthodontics, College of Stomatology, Fourth Military Medical University, Xi'an, 710032, China.
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.