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