Aim : It is for comparing the retention of complete denture bases made by border molding using the low fusing compound and putty type condensation silicon by using metallic zinc- oxide eugenol and medium body condensation silicon as final impression material.. Subjects and Methods: the study was carried out on 20 patients , the selected was completely edentulous with well-developed ridge four dentures for each patient was fabricated :( Group A):border molding with green stick compound and final impression with zinc oxide eugenol(Group B): border molding with green stick compound and medium body rubber base as a final impression(Group C): border molding with putty type and medium body condensation silicon as a final impression materials(Group D): border molding with putty type condensation silicon and medium body rubber base as a final impression. Results: Statistically significant results were in complete denture obtained from putty type border molding and medium body condensation silicon final impression, while the least values obtained from green stick border molding and zinc oxide eugenol final impression. Conclusion: Based on the favourable results of this study , it can summarized that the complete denture obtained from putty type and medium body condensation silicone more retentive than other complete dentures obtained from other border molding and final impression materials.