System for producing, using CAD/CAM technology, a screw-type dental prosthesis to be connected to a dental implant, comprising: - A structure of a dental prosthesis, - An interface to be introduced into the structure, the interface having a screw channel and a longitudinal axis, - A screw for connecting the interface to the dental implant and therefore securing the dental prosthesis on the dental implant, and - At least one digital CAD library in a CAD/ CAM software, associated to the interface and to the structure of the dental prosthesis, wherein the interface comprises three different sections along the longitudinal axis thereof: - a hollow proximal end, with a connection element (17, 18) for connecting to the implant, - a hollow intermediate area, after the proximal end, with an outer platform on which the dental structure will be supported, and - a retention body with an inner through hole that defines a distal end of the interface and arranged after said intermediate area, said retention body having at least one cutting indication (14, 15), in the shape of notches, etchings. colours, grooves and/ or marks, on the surface thereof that indicates at least one length where a cut of the retention body can be made, thus making the length of the retention body adjustable to be adapted to the structure based on the dimensions of said structure maximizing the contact surface between an outer surface of the interface and an inner surface of a channel in the structure, wherein said surfaces are adapted to each other due to the use of the digital CAD library, wherein the different available lengths of the retention body are associated with the digital CAD library, said lengths being adjustable between 4 mm and 10 mm. - A structure of a dental prosthesis, - An interface to be introduced into the structure, the interface having a screw channel and a longitudinal axis, - A screw for connecting the interface to the dental implant and therefore securing the dental prosthesis on the dental implant, and - At least one digital CAD library in a CAD/ CAM software, associated to the interface and to the structure of the dental prosthesis, wherein the interface comprises three different sections along the longitudinal axis thereof: - a hollow proximal end, with a connection element (17, 18) for connecting to the implant, - a hollow intermediate area, after the proximal end, with an outer platform on which the dental structure will be supported, and - a retention body with an inner through hole that defines a distal end of the interface and arranged after said intermediate area, said retention body having at least one cutting indication (14, 15), in the shape of notches, etchings. colours, grooves and/ or marks, on the surface thereof that indicates at least one length where a cut of the retention body can be made, thus making the length of the retention body adjustable to be adapted to the structure based on the dimensions of said structure maximizing the contact surface between an outer surface of the interface and an inner surface of a channel in the structure, wherein said surfaces are adapted to each other due to the use of the digital CAD library, wherein the different available lengths of the retention body are associated with the digital CAD library, said lengths being adjustable between 4 mm and 10 mm. - a hollow proximal end, with a connection element (17, 18) for connecting to the implant, - a hollow intermediate area, after the proximal end, with an outer platform on which the dental structure will be supported, and - a retention body with an inner through hole that defines a distal end of the interface and arranged after said intermediate area, said retention body having at least one cutting indication (14, 15), in the shape of notches, etchings. colours, grooves and/ or marks, on the surface thereof that indicates at least one length where a cut of the retention body can be made, thus making the length of the retention body adjustable to be adapted to the structure based on the dimensions of said structure maximizing the contact surface between an outer surface of the interface and an inner surface of a channel in the structure, wherein said surfaces are adapted to each other due to the use of the digital CAD library, wherein the different available lengths of the retention body are associated with the digital CAD library, said lengths being adjustable between 4 mm and 10 mm.