The M-Pendulum produces AP changes via distalization and rotation of the maxillary first molars. To accomplish this, .032 TMA springs are engaged into .036 lingual tubes that are soldered to the molar bands -- delivering a light continuous force to the molars. The anterior anchorage needed to accomplish this movement is gained through the use of occlusal bonded rests on the pre-molars. if added retention is desired, bands can be used on the bicuspids in place of the rests. Note: this appliance incorporates the innovative M-Pendulum spring design -- an inverted horizontal loop placed half way between the spring helix and the .036 molar tubes. The design overcomes the standard Pendulum spring’s tendency to cause cross bites and leave the molar roots mesially inclined. By simply opening the horizontal loop, a buccal and/or distal uprighting force is created -- producing a bodily movement of the molars.