Procedure for the production of a piece for dental prostheses or parts for dental prostheses, with the steps of: a) - producing gross parts (12) or gross bodies (8) by pressing a ceramic powder material at a pressing pressure isostatic or uniaxial, biaxial or triaxial of at least 1500 bar and not exceeding 4100 bar, equivalent to 1 bar to the value of 10 5 Pa, to give a blank (12) or a gross body (8), in which it is applied ambient temperature or a temperature below 200 ° C at the maximum pressing pressure or during the entire pressing process, the gross bodies (8) or the gross parts (12) having flexural strengths at 3 points in the range of 20 MPa at 180 MPa, and in which the gross bodies (8) are divided into several gross pieces (12), this being preferably done by separation along a plane that is preferably approximately perpendicular to a longitudinal axis (9) of the gross body (8)； or - providing a blank (12), the blank (12) being obtainable by isostatic or uniaxial, biaxial or triaxial pressing of a ceramic material at a pressing pressure of at least 1500 bar and not exceeding 4100 bar, in the that ambient temperature or a temperature below 200 ° C is applied to the maximum pressing pressure or during the entire pressing process, the blank (12) presenting after the pressing a 3-point flexural strength in the range of 20 MPa at 180 MPa； or - providing a set of blanks from the same gross body (8), the gross body (8) being obtainable by pressing a ceramic material at an isostatic, uniaxial, biaxial or triaxial pressing pressure of at least 1500 bar and not exceeding 4100 bar, in which ambient temperature or a temperature below 200 ° C is applied to the maximum pressing pressure or during the entire pressing process, the gross body (8) presenting after pressing a flexural strength in 3 points in the range of 20 MPa to 180 MPa； b) work the brute or the gross parts of the set of brutes to form a piece for dental prostheses or several pieces for dental prostheses, for
