Method: Seventy-two titanium abutments were attached to an implant analog with 35Ncm torque. Wax pattern of copings with a loop in the occlusal surface were made on the abutments. The patterns were invested in a phosphate-bound investment and casted with palladium-silver alloy. Dental luting agents used in this experiment were: G1-provisional cement Temp Bond; G2-Zinc Phosphate cement; G3-resin cement Rely XTM ARC; G4-pure COP; G5-COP + 10% CaCO3 filler; G6-COP + 50% CaCO3 filler. After cementation, the specimens were stored in 37ºC distilled water for 24h. They were submitted to tensile strength test in a universal testing machine (EMIC DL 2000, 5 KN, 0.5 mm/min). Statistical analysis was performed with Kruskal-Wallis and Student-Newman-Keuls test (α=0.05).
Result: The median values of the retentive strength (N) were: G1=57,20; G2=343,56; G3=40,07; G4=258,98; G5=466,57; G6=209,63. The Kruskal-Wallis test showed statistical differences among the groups (p<0.01). Groups 1 and 3 had the lowest strength; Groups 4, 5 and 6 were equal to Group 2, and Group 5 had the higher strength.
Conclusion: The retentive strength of metal copings cemented with Castor-Oil Polyurethane is similar to those cemented with Zinc Phosphate, and can be influenced by the addition of calcium carbonate.
Keywords: Castor-Oil, Cements, Dental materials, Implants and Polymers