Efficacy of Transverse Maxillary Expansion With AMCOP Preformed Appliances

"The device measure will be determined with OrthoCad program on digital models, taking the distance between the vestibular cusps of the upper first molars, at the level of the most prominent point. AMCOPs are preformed devices and there are five different measures based on transverse diameter: 1 (45mm), 2 (50mm), 3 (55mm), 4 (60mm), 5 (65mm).~Requiring expansion, we will choose an higher AMCOP measure than the transverse distance measured on the digital models at T0.~The clinical indications for use of the AMCOP device will be as follow:~* in the first week, wear the appliance during the night and for 30 minutes during the day~* from the second week onward, wear the appliance for one hour during the day and throughout the night During this time, every month we will visit patients and we will expand the device by soaking it in hot water at about 70 °C for 30 s and then in cold water to stabilize it in its new shape."