Orthodontic device (10) comprising at least a first support means (17-19) for pressing on the left of an upper jaw of a patient to be treated, at least a second support means (20-22 ) for pressing on the right of said jaw and a central cylinder (23, 51) for modulating a spacing of said support means to widen the palate of said patient, characterized in that the device (10) further comprises a mechanical connection of rotation (R1, R2) between the jack and said first support means and a mechanical connection of rotation (R1, R2) between the jack and said second support means to allow geometric adjustment during installation of the device ( 10) in the patient's mouth, at least in the vertical direction, the anteroposterior or transverse direction.
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