Method for the production of dental spare parts, such as tooth crowns- and bridges, by means of spark erosion

A method for the production of dental spare parts comprising:

• disposing individual positive wax models on carriers a small distance from each other in a casting frame in such a way, that the widest horizontal cutting plane of each positive wax model is situated in a common equator plane;
• filling areas between the individual positive wax models with a molding mass up to the equator plane to provide a first model;
• inserting in at least two interspaces respectively one orientation pin, said orientation pins being disposed vertically to the equator plane;
• cleaning a surface of the first model;
• forming a silver coating on the cleaned surface of the first model;
• electroplating the silver layer with a copper reinforcement;
• providing a stabilizing rear construction on the copper reinforcement to form a first electrode;
• finishing the first electrode and removing it from the casting frame;
• rotating the first model through 180 degrees about an axis disposed in the equator plane;
• inserting the rotated first model into a casting frame filled with a hardening carrier mass;
• detaching the carriers and the molding mass after the hardening of the carrier-mass to provides a second model;
• forming a silver layer on a surface of the second model;
• electroplating the silver layer with a copper reinforcement layer;
• providing a stabilizing rear construction on the copper layer to provide a second electrode;
• finishing the second electrode and separating it from the casting frame;
• eroding a first surface of a body with the first electrode;
• eroding a second surface of the body, opposed from said first surface, with the second electrode;
• and
• removing remaining cross-pieces from the resulting eroded body in the area of the equator-plane to provide the spare parts.