Objectives: Applications of electroforming to implant superstructures have been popular because of their excellent adaptability. However, retentive force of electroforming crown is not clearly discussed. The purpose of this study was to compare the retentive force of the porcelain-fused-to-metal crown fabricated with electroforming and that fabricated with conventional casting. Methods: The solid abutment (4.0mm, 048.540, Straumann) of ITI implant (8.0mm, 042.241S, Straumann) used as the master model. Electroformed frameworks of 0.2mm thickness were fabricated on the abutment using the Auro-Galva-Crown system (AGC, Wieland) (n=5). Conventional cast metal frameworks of 0.7 mm thickness were fabricated with a high noble metal alloy (Degudent U, Degussa) for porcelain fusing (n=5). Subsequently, a porcelain (Super Porcelain AAA,Noritake) was fused on each framework. All porcelain-fused-to-metal crowns were cemented on the implant abutment with a resin-modified glass-ionomer cement (Fuji Luting-S, GC). After cementation, implant-abutment-crown assembles were stored for an hour in 100% humidity at 37 ^˚C, and thermocycled for 10,000 times between 5 ^˚C and 55 ^˚C. The assembles were subjected to a tensile test using a universal testing machine at a crosshead speed of 1.0 mm/min. The retentive force was determined from the required force of removal the crown from the abutment and analyzed using the t-test. Results: The means +/�| S.D.s of retentive force of electroformed and conventional crowns was 259.2 +/�| 54.1 N and 299.8+/�| 45.0 N, respectively. The retentive force of conventional crowns showed greater retentive strength than that of electroformed crowns, but not significant.Conclusions: The retentive force of the electroformed porcelain-fused-to-metal crown to the implant abutment was similar to that of conventional porcelain-fused-to-metal crown.