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2. Biomechanical basis of extraction space closure;Nanda,1997
3. The transition from standard edgewise to preadjusted appliance system;McLaughlin;J Clin Orthod,1989
4. Controlled space closure with a preadjusted appliance system;Bennett;J Clin Orthod,1990
5. En masse retraction and two-step retraction of maxillary anterior teeth in adult Class I women. A comparison of anchorage loss;Heo;Angle Orthod,2007