Rapid palatal expander: an anchor unit for second molar distalization in Angle Class II treatment.World J Orthod. 2010 Spring; 11(1):75-84.WJ
Distal movement of maxillary molars is a common approach for nonextraction treatment of Angle Class II patients. Because of known difficulties involving moving the maxillary first molars distally in the presence of second molars, this article describes how the distally directed force is applied immediately to the second molars. A rapid palatal expander can be used as a reliable unit to facilitate the distal movement of the second maxillary molars.