Process for the production of parts of dental prostheses (10, 12, 13, 22, 23) based on tecnologiaCAD / CAM digital data recording surface of an area of residual tooth, three-dimensional design of at least one piece of dental pr6tesis for the area of residual tooth including datosde the registered surface area and residual data creation tooth forma partial or complete yproduccion of at least one piece of dental prostheses based on the data of the Ylos surface shape data, manufacture of primary crowns (23) by milling technique 3 + 1 axes, characterized in that since the primary crowns have two directions of insertion, the router is aligned during procedure laid milling accurately according to the first or second Direcci6n of inserci6n Yporque into first milling the milling is aligned in parallel to the first direction deinserciOn and machined, with a lineation, all data relating to the first direction of inserci6n Yporque below the workpiece and / or the milling is aligned according to the second direction deinserciOn and machined all data relating to the second insertion direction.Procedimiento para la producciOn de piezas de protesis dental (10, 12, 13, 22, 23) basandose en tecnologiaCAD/CAM con registro digital de datos de la superficie de una zona de diente residual, diseno tridimensional de al menos una pieza de pr6tesis dental para la zona de diente residual incluyendo los datosde la superficie registrados de la zona de diente residual y creaciOn de datos de forma correspondientes yproduccion parcial o completa de la al menos una pieza de protesis dental basandose en los datos de la superficie ylos datos de forma, fabricacion de coronas primarias (23) mediante tecnica de fresado de 3+1 ejes, caracterizado porque puesto que las coronas primarias presentan dos direcciones de insercion, la fresadora se alinea durante elprocedimiento de fresado de forma exacta de acuerdo con la primera o la segunda direcci6n de inserci6n yporque en un primer ciclo de fresado se
