When it is necessary to treat a crowded upper or lower arch, the MemRx EA is the appliance of choice. It has a Memory Expansion Screw for lateral development as well as NiTi open coil springs that are activated by the Inman Power Component (I.R.C.) for labial movement of the anterior teeth.

Once the appliance is cemented into the mouth, the Memory Screw may be adjusted 5-6 turns immediately. This will load the internal NiTi Open Coil Springs. Expansion is expressed in a gentle, more consistent manner than traditional RPE screws.

The sliding anterior wire rests at or below the cingulum of anterior teeth. Gentle spring forces from the NiTi Open Coil Springs encourage bodily movement of the anterior teeth. Note: It is suggested that a ledge of composite be placed just incisal to the sliding anterior wire to inhibit any incisal deflection that may occur once spring pressure is applied.

Anchorage is achieved by using bands on the 6-year molars and first bicuspids. Note: A parallel path of insertion between molars and bicuspids must exist for the appliace to fit properly. If no proper path of insertion exists, clasps or bonded mesial occlusal rests may be used.