Electroforming Hybrid System (EIS) A combined procedures for ceramometal restorations

A new method has been developed to combine the high level of marginal precision of galvanoforming with the strength of the casting metal. The process is named the Electroforming HybrId System (EIS®). The tooth preparation, impression, and master model preparation are just as accurate in this process. In the first step, pure gold cervical rings were prepared for all abutment teeth using the electroforming process. The margins of recovered gold rings were finished with a silicone wheel on both sides, cervical and coronal once and fitted on the dies. After insulation, the wax pattern with pontics was built—bearing in mind resistance, retention and aesthetic factors. The gold rings were removed from the wax pattern before the investing procedure. After casting, the investment material was removed using a sandblaster. The metal framework was fitted on the gold rings seated on the master model. The inner part of the cast copings and the external coronal part of the gold rings were sandblasted, covered with gold colloidal paste, joined together and dried with hot air for 10 minutes. The combined cast framework and gold rings were removed from the master cast and fired in a porcelain furnace at 980°C for two minutes under vacuum. The ceramic baking procedure proceeds as usual. In conclusion, with EIS® long span framework offers time savings with no need for pontic or connector solder joints. It is possible to improve marginal precision thanks to the superior malleability of pure gold.