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Volume 9 Issue 1 (January, 2021)

Original Articles

Comparison of en masse retraction and two-step retraction in the maxillary and mandibular arches during the orthodontic space closure
Amrita Pritam

Background: The closing of extraction spaces can be performed using two main retraction techniques: en masse retraction (ER) or two-step retraction (TSR). The present study was conducted to compare ER and TSR in the maxillary and mandibular arches during the orthodontic space closure phase without auxiliary anchorage device. Materials & Methods: 60 subjects with class I bimaxillary protrusion malocclusion with mild to moderate crowding in the upper and lower incisors was divided into 2 groups of 30 each. Group I comprised of ER patients and group II had or the TSR patients. The amount of posterior anchorage loss in the molars and the retraction of the incisors between ER and TSR was recorded. Results: In group I and II, in maxillary incisors, value of tipping was -10.4 and -11.8, crown/vertical was -1.8 and -1.4, apex/vertical was -1.48 and -1.50, crown/horizontal was -4.50 and -4.64 and apex/horizontal was -1.96 and -1.20 respectively. The difference was non- significant (P> 0.05). In group I and II, in mandibular incisors, value of tipping was -9.62 and -9.86, crown/vertical was 0.68 and 0.76, apex/vertical was 1.98 and 1.92, crown/horizontal was -4.62 and -4.86 and apex/horizontal was -1.4 and -1.5 respectively. The difference was non- significant (P> 0.05). Conclusion: The amount of retraction of incisors and anchorage loss of molars between ER and TSR was comparable. Key words: Anchorage, en masse retraction, two-step retraction.

 
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