Most of the time, Class II molar relationships occur due to the mesiopalatal rotation of themaxillary molars. Transpalatal arches have been used routinely to derotate and stabilize the molars. In this article, an easy, effective, and precise method is introduced. Hinge cup attachments, instead of palatal sheaths, and square beta-titanium alloy wires, instead of round stainless steel wires, have been used. A new biomechanical approach is introduced. The results show that molars were derotated effectively in a short period of time with the application of this method. World J Orthod 2003;4:229–236