Retentiveness of implant-supported metal copings using different luting agents

Abstract

Background: With regard to potential retrievability of cement-retained implant restorations, the
retentive strength of the luting agents is critical. The aim of this study was to evaluate the retention
values of implant-supported metal copings using different luting agents.
Materials and Methods: Twenty ITI implant analogs and solid abutments of 5.5-mm height were
embedded vertically in autopolymerizing acrylic resin blocks. Metal copings with a loop on the
occlusal surface were fabricated using base metal alloy (Rexillium III). The copings were luted using
eight 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 were
incubated at 37°C for 24 hours, conditioned in artificial saliva for 7 days and thermocycled for
5000 cycles (5-55°C). The dislodging force was measured using a universal testing machine at a
crosshead 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) which
showed 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 are
recommended for definitive cementation of single implant-supported restorations. The provisional
cements and glass ionomer may allow retrievability of these restorations.
Key Words: Cementation methods, dental cement, dental prosthesis/retention, dental prosthesis,
implant-supported