A method for providing a restoration and a reduction coping for a preparation, comprising receiving one order from a user for a restoration and a reduction coping, obtaining a digital restoration design and a digital reduction coping design taken during one patient sitting, operating a computer aided manufacturing system for manufacturing a restoration based on the digital restoration design and manufacturing a reduction coping based on the digital reduction coping design, shipping the restoration and the reduction coping to the user wherein the digital restoration design and the digital reduction coping design is obtained by operating a computer aided design system for designing the digital restoration design and the digital reduction coping design wherein operating the computer aided design system comprises: obtaining a digital 3D representation of the upper jaw and the lower jaw of the patient taken during one patient sitting, said digital 3D representation comprises a digital 3D preparation representing at least one preparation targeted for receiving a restoration; digitally determining a reduction surface (A - A) intersecting the digital 3D preparation representing the at least one preparation, said reduction surface (A - A) comprises a digital cutting surface for cutting the digital 3D preparation representing the at least one preparation and the reduction surface is arranged at a distance from a tooth that is antagonist to the at least one preparation in order to meet a minimum thickness requirement for the digital restoration design; digitally modifying the digital 3D representation representing the at least one preparation by digitally cutting, based on the digital cutting surface, the digital 3D preparation to create a modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A); and digitally designing both the digital restoration design and the digital reduction coping design based at least on the reduction surface (A - A), the digital 3D preparation and modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A) after only the one patient sitting. receiving one order from a user for a restoration and a reduction coping, obtaining a digital restoration design and a digital reduction coping design taken during one patient sitting, operating a computer aided manufacturing system for manufacturing a restoration based on the digital restoration design and manufacturing a reduction coping based on the digital reduction coping design, shipping the restoration and the reduction coping to the user wherein the digital restoration design and the digital reduction coping design is obtained by operating a computer aided design system for designing the digital restoration design and the digital reduction coping design wherein operating the computer aided design system comprises: obtaining a digital 3D representation of the upper jaw and the lower jaw of the patient taken during one patient sitting, said digital 3D representation comprises a digital 3D preparation representing at least one preparation targeted for receiving a restoration; digitally determining a reduction surface (A - A) intersecting the digital 3D preparation representing the at least one preparation, said reduction surface (A - A) comprises a digital cutting surface for cutting the digital 3D preparation representing the at least one preparation and the reduction surface is arranged at a distance from a tooth that is antagonist to the at least one preparation in order to meet a minimum thickness requirement for the digital restoration design; digitally modifying the digital 3D representation representing the at least one preparation by digitally cutting, based on the digital cutting surface, the digital 3D preparation to create a modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A); and digitally designing both the digital restoration design and the digital reduction coping design based at least on the reduction surface (A - A), the digital 3D preparation and modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A) after only the one patient sitting. obtaining a digital 3D representation of the upper jaw and the lower jaw of the patient taken during one patient sitting, said digital 3D representation comprises a digital 3D preparation representing at least one preparation targeted for receiving a restoration; digitally determining a reduction surface (A - A) intersecting the digital 3D preparation representing the at least one preparation, said reduction surface (A - A) comprises a digital cutting surface for cutting the digital 3D preparation representing the at least one preparation and the reduction surface is arranged at a distance from a tooth that is antagonist to the at least one preparation in order to meet a minimum thickness requirement for the digital restoration design; digitally modifying the digital 3D representation representing the at least one preparation by digitally cutting, based on the digital cutting surface, the digital 3D preparation to create a modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A); and digitally designing both the digital restoration design and the digital reduction coping design based at least on the reduction surface (A - A), the digital 3D preparation and modified digital 3D representation of the at least one preparation comprising the reduction surface (A - A) after only the one patient sitting.