Isfahan University of Medical SciencesDental Research Journal1735-33279120120218Retentiveness of implant-supported metal copings using different luting agents889889ENFarahnazNejatidaneshOmidSavabiDepartment of Prosthodontics and Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Biomaterials Research Group, Isfahan University of Technology, Isfahan, Iran. savabi@hotmail.comMaziarEbrahimiGhazalSavabi20120218Background: With regard to potential retrievability of cement-retained implant restorations, theretentive strength of the luting agents is critical. The aim of this study was to evaluate the retentionvalues of implant-supported metal copings using different luting agents.Materials and Methods: Twenty ITI implant analogs and solid abutments of 5.5-mm height wereembedded vertically in autopolymerizing acrylic resin blocks. Metal copings with a loop on theocclusal surface were fabricated using base metal alloy (Rexillium III). The copings were luted usingeight cements with different retention mechanisms (Panavia F2.0, Fuji Plus, Fleck’s, Poly F, Fuji I,Temp Bond, GC-free eugenol, and TempSpan) under static load of 5 kg (n=10). All specimens wereincubated at 37°C for 24 hours, conditioned in artificial saliva for 7 days and thermocycled for5000 cycles (5-55°C). The dislodging force was measured using a universal testing machine at acrosshead speed of 5 mm/min. Statistical analyses were performed using Kruskal-Wallis (α=0.05)and Mann-Whitney tests with Bonferroni correction (α=0.001).Results: Fuji Plus and TempSpan had the highest and the least mean retentive strength, respectively(320.97±161.47, 3.39±2.33). There was no significant difference between Fuji Plus, Fleck’s, Ploy F,and Panavia F2.0. These cements were superior to provisional cements and Fuji I (P<0.001) whichshowed statistically same retentive strength.Conclusion: Within the conditions of this study, the resin modified glass ionomer, zinc phosphate,zinc polycarboxylate, and Panavia F2.0 had statistically the same retentive quality and arerecommended for definitive cementation of single implant-supported restorations. The provisionalcements and glass ionomer may allow retrievability of these restorations.Key Words: Cementation methods, dental cement, dental prosthesis/retention, dental prosthesis,implant-supported