A 2-center comparison of maxillary incisor positioning with non-extraction, 2-maxillary premolar and 4-premolar extractions for Class II treatment

Conclusion Class II treatment conducted non-extraction, with 2-maxillary and with 4-premolar extraction protocols showed similar effects on final maxillary incisors positioning and nasolabial angle. In general, the 4-premolar extraction protocol was potentially more retrusive, but the dentofacial differences were slight and not statistically significant.

Source: Orthodontic Waves - August 2, 2015 Category: Dentistry Source Type: research