A combination of an orthodontic device for cranial adaptations and an aligner to operate in combination with said orthodontic device, wherein the orthodontic device is envisaged to be allocated between a patient's two dental arches and comprising: - a U-shaped element with a seat on the top thereof to accommodate the dental arch concerned by the treatment, - on the side opposite the seat on each side of the U, a lower vestibular shield envisaged to engage externally with the dental arch not concerned by the treatment and envisaged to contain the lower arch, - centrally, a front shield arranged to rest against the incisor teeth, characterised by the fact that the said device comprises: - a palatal shield on the top thereof, on each side of the U, to strengthen the pressure which the patient applies while contracting the musculature and to allow the maxillae to expand, thereby widening the upper arch, - an upper lingual shield located inside, at the centre of the U and equipped, centrally, with a lingual ramp envisaged to ensure the tongue remains in a specific well-defined area, at the incisor teeth, and delimited on one side by the device and on the other by lingual pins present in the aligner which the patient must wear, - a median crest which allows precise engagement between the aligner and the said device, - a series of inclined sectoral surfaces located inside the seat and situated, respectively, at the premolar teeth as regards the first surface and the molar teeth the second surface, while the third surface is envisaged near the free end of the U, the said inclined surfaces protruding from the base of the seat and having an essentially trapezoidal section with the slightly arched side facing outwards being arranged to rest against the inside of the cheek, there being three inclined surfaces on each side, which can be removed individually to obtain a highly customisable functional device. - a U-shaped element with a seat on the top thereof to accommodate the dental arch concerned by the treatment, - on the side opposite the seat on each side of the U, a lower vestibular shield envisaged to engage externally with the dental arch not concerned by the treatment and envisaged to contain the lower arch, - centrally, a front shield arranged to rest against the incisor teeth, characterised by the fact that the said device comprises: - a palatal shield on the top thereof, on each side of the U, to strengthen the pressure which the patient applies while contracting the musculature and to allow the maxillae to expand, thereby widening the upper arch, - an upper lingual shield located inside, at the centre of the U and equipped, centrally, with a lingual ramp envisaged to ensure the tongue remains in a specific well-defined area, at the incisor teeth, and delimited on one side by the device and on the other by lingual pins present in the aligner which the patient must wear, - a median crest which allows precise engagement between the aligner and the said device, - a series of inclined sectoral surfaces located inside the seat and situated, respectively, at the premolar teeth as regards the first surface and the molar teeth the second surface, while the third surface is envisaged near the free end of the U, the said inclined surfaces protruding from the base of the seat and having an essentially trapezoidal section with the slightly arched side facing outwards being arranged to rest against the inside of the cheek, there being three inclined surfaces on each side, which can be removed individually to obtain a highly customisable functional device. - a palatal shield on the top thereof, on each side of the U, to strengthen the pressure which the patient applies while contracting the musculature and to allow the maxillae to expand, thereby widening the upper arch, - an upper lingual shield located inside, at the centre of the U and equipped, centrally, with a lingual ramp envisaged to ensure the tongue remains in a specific well-defined area, at the incisor teeth, and delimited on one side by the device and on the other by lingual pins present in the aligner which the patient must wear, - a median crest which allows precise engagement between the aligner and the said device, - a series of inclined sectoral surfaces located inside the seat and situated, respectively, at the premolar teeth as regards the first surface and the molar teeth the second surface, while the third surface is envisaged near the free end of the U, the said inclined surfaces protruding from the base of the seat and having an essentially trapezoidal section with the slightly arched side facing outwards being arranged to rest against the inside of the cheek, there being three inclined surfaces on each side, which can be removed individually to obtain a highly customisable functional device.