Objectives: The differences in mechanical properties of restorative cements may result in differences in their clinical performance. This study proposes to evaluate, in vitro, the tensile strength of Cu-Al alloy cast metal core cemented to human canine roots with 4 different cementing agents. Methods: Forty endodontically treated human canines had their crowns clinically section to cervical level. Root de-filling was done (10mm) by Largo drills. The conduits and coronary portion were made with Duralay resins (Reliance Dental Mfg. Co., USA.) The core were cast with Cu-Al alloy. The cements used were Zinc Phosphate, Vitremer(3M), GC Fuji Plus Capsule (GC Corporation), C&B (Bisco) according to the manufacturers' recommendations. After thermocycling, the test specimens were submitted to tensile test at a speed of 0.5 mm/minute. The results obtained were submitted to variance analysis and afterwards to the Neuman-Keuls test at 0.05 significance level. Results: Statistical test showed differences between the Zinc Phosphate (9.90 + 2.06) and the other Groups: Vitremer (14.50 + 2.83); Fuji Plus (12.76 + 2.06); C & B (13.04 + 1.50). Conclusion: The zinc phosphate cement showed the lowest tensile strength values in relation to the other groups, which were statistically similar among them.

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