Embedded hinge for reversible doors comprising a frame, formed of one cross-member and a pair of uprights, and at least one panel, said hinge comprising a pintle element and a seat holder insert, said pintle element being suitable for being fitted at one end of an upright and comprising: - a pin extending in a longitudinal direction according to a longitudinal axis of the panel of the door, - a support plug of the pin extending perpendicular to the axis of the pin, - an appendage forming: - at least one first abutment surface for abutting on an upright, and suitable for preventing translations of the pintle element in an orthogonal direction (o) to a transversal axis (t) of the panel of the door and to said longitudinal axis of the panel of the door during assembly, - a second abutment surface for abutting on the same upright, and suitable for preventing translations of the pintle element in a transversal direction according to said transversal axis (t) of the panel of the door during assembly, and - a third abutment surface for abutting on the cross-member and suitable for preventing translations of the pintle element in a longitudinal direction according to said longitudinal axis of the panel of the door during assembly, said seat holder insert being suitable for being fitted at one end of the panel and comprising: - at least one seat suitable for housing said pin of the pintle element, - at least one access passage into the at least one seat, said at least one access passage permitting access of the pin into the at least one seat in a direction perpendicular to the longitudinal axis of the pin, said at least one access passage having at least one surface oblique to a transversal axis of the at least one seat, - an obturator translatable in a straight linear direction perpendicular to the axis of the pin so as to open and close the at least one access passage and removably holding the pin in the at least one seat. - a pin extending in a longitudinal direction according to a longitudinal axis of the panel of the door, - a support plug of the pin extending perpendicular to the axis of the pin, - an appendage forming: - at least one first abutment surface for abutting on an upright, and suitable for preventing translations of the pintle element in an orthogonal direction (o) to a transversal axis (t) of the panel of the door and to said longitudinal axis of the panel of the door during assembly, - a second abutment surface for abutting on the same upright, and suitable for preventing translations of the pintle element in a transversal direction according to said transversal axis (t) of the panel of the door during assembly, and - a third abutment surface for abutting on the cross-member and suitable for preventing translations of the pintle element in a longitudinal direction according to said longitudinal axis of the panel of the door during assembly, - at least one first abutment surface for abutting on an upright, and suitable for preventing translations of the pintle element in an orthogonal direction (o) to a transversal axis (t) of the panel of the door and to said longitudinal axis of the panel of the door during assembly, - a second abutment surface for abutting on the same upright, and suitable for preventing translations of the pintle element in a transversal direction according to said transversal axis (t) of the panel of the door during assembly, and - a third abutment surface for abutting on the cross-member and suitable for preventing translations of the pintle element in a longitudinal direction according to said longitudinal axis of the panel of the door during assembly, - at least one seat suitable for housing said pin of the pintle element, - at least one access passage into the at least one seat, said at least one access passage permitting access of the pin into the at least one seat in a direction perpendicular to the longitudinal axis of the pin, said at least one access passage having at least one surface oblique to a transversal axis of the at least one seat, - an obturator translatable in a straight linear direction perpendicular to the axis of the pin so as to open and close the at least one access passage and removably holding the pin in the at least one seat.