The bmx is a new BENEfit mini-implant anchored appliance for Rapid Maxillary Expansion in young patients. Using the De Franco Screwguide the distance and parallelity of the BENEfit screws can be precisely determined directly on the patient and impressions are no longer necessary ! The bmx is available in three sizes – 6, 8 and 10mm – and comes with two posterior wires which can be cut-off flush for patients under 12 years of age or left and fixed to the upper molars for additional alveolar / dental support.