Abstract: An assembly for manufacturing dental prostheses includes a set of modular members constituted by a straight bar, a curved bar, a plurality of cylinders and two end members, adapted to be assembled and soldered to each other to form a reinforcement frame of a dental prosthesis, under immediate load and executable within the same day. The method for manufacturing dental prostheses includes assembling the components and mutually soldering them so as to form a rigid reinforcement frame of a dental prostheses that can be applied to the implants inserted previously in the lower or upper arch of the patient.