The advantage of the AGC® electroforming technique is the precision fit and the material involved.pure gold. Margins are typically 5 microns when done on a well-prepared smooth chamfer margin. 100% gold means no allergic potential to the patient and no gingival irritation. Clinical success of the AGC® system is scientifically documented. AGC Bridge & ImplantT yields even higher strength and density, making it ideal for long span bridges and implants. Every process uses new material, keeping the electroformed gold layer free of shrinkage cavities, porosity and impurities.