Objectives: A veneered crown might fracture within the porcelain or on the alloy surface. Moreover various alloys could be used to fabricate the crown. This in vitro study evaluated the shear bond strengths of the resin bonding to porcelain or 3 different alloys using four repair systems. Methods: 8 cylindrical specimens of each metal (Au-Ag,Pd-Ag,Co-Cr) as well as 40 specimens (n=5) of feldspathic porcelain (FP) were fabricated according to ISO10477. The following repair systems were investigated: CoJet-System (J,Espe), Silistor (S,Heraeus-Kulzer), Cimara (C,Voco) and Ceramic Repair (R,Vivadent). Resin composite cylinders of Charisma (H,Heraeus-Kulzer) and Pertac Hybrid (P,Espe) were bonded with J,S,C and R onto the specimens of the 3 alloys and of FP forming 8 groups of each material. The bonded specimens were subjected to 5000thermal cycles (5–55°C) before shear bond strength was tested. Then the failure mode was assessed. Afterwards the alloy specimens were polished and the procedure was repeated 4times. Statistical analysis was carried out with one-way ANOVA and Bonferroni-Dunn's multiple comparisons post hoc analysis for test groups (a=0.05). Results: Results (in MPa) higher than 10MPa were found for FP with S (H 23.1±5.8, P 11.7±2.4), C (H 14.1±3.1, P 12.0±3.1) and R-H (15.1±1.0), furthermore with J-P (Au-Ag 19.7±5.6, Pd-Ag 14.6±5.8, Co-Cr 10.3±6.3, FP 12.5±2.6) and J-H (Au-Ag 13.0±2.3, Pd-Ag 11.6±1.2, Co-Cr 10.3±2.6, FP 17.8±3.6). R failed with all alloys as well as S and C failed with Co-Cr. Significantly superior results were found for S-H,S-P,C-H,C-P,R-H and R-P on FP compared to all three alloys (p<0.05). No significant differences were obtained between Au-Ag and Pd-Ag. Conclusions: J showed superior results regardless of the repair resin, the alloy or FP respectively. S and C showed low values on Au-Ag and Pd-Ag, but higher on FP, whereas S and C on Co-Cr and R on any alloy could not be recommended.

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