Patients in this group will be treat with an elastodontic device adapted to the patient according to the shape of the dental arches. This device is similar to a mouthguard and embraces both dental arches. This appliance is worn overnight and the patient will be checked every month. The distance between the palatal cusps of the first upper premolars will be taken at T0( before the start of the therapy), at T1 (after six months)and at T2 (after one month). All the dental recors will be taken by the same operator with an intraoral scanner 3D.

Patients in this group will be treat with a Schwarz removable device constructed individually by the dental technician.This device has a resin baseplate with an activation screw in the center and Adams hooks on the upper first molars and it works by turning the expansion screw in the center of the palate one-quarter turn, once or twice a month by the ortodontist. This appliance is worn overnight and some hours during the day (totally 16 hours).The distance between the palatal cusps of the first upper premolars will be taken at T0( before the start of the therapy), at T1 (after six months)and at T2 (after one month). All the dental recors will be taken by the same operator with an intraoral scanner 3D.

Removable device that embraces two dental archs

To compare the palatal first premolars width in three times