Purpose: The aim of this study was to compare the fracture strength of several
commercial interim fixed partial denture (FPD) materials in an artificial oral environment.
Materials and Methods: Twenty identical three-unit FPDs of the PMMA materials Trim
and Cronsin and the composite-based materials Protemp 3 Garant, Protemp Garant,
Luxatemp, and Tempofit were cemented on Co-Cr alloy dies. Ten FPDs of each material
were stored for 14 days in distilled water and artificially aged. Ten FPDs of each material
were stored for 24 hours in distilled water as a control group. Fracture resistance was
determined using a testing machine. Results: The tested interim materials showed initial
fracture values between 484 and 1,081 N. During artificial aging, the PMMA FPDs failed
because of irreversible deflection. All Tempofit FPDs, four Luxatemp FPDs, two Protemp
Garant FPDs, and one Protemp 3 Garant FPD failed because of fracture during artificial
aging. The remaining FPDs showed fracture values of 759 N (Luxatemp), 772 N (Protemp
Garant), and 956 N (Protemp 3 Garant). Conclusion: The PMMA FPDs and the composite
Tempofit FPDs showed poor stability during artificial aging, whereas the highest strength
values in combination with low fracture rates were found for the Protemp 3 Garant
composite FPDs. Int J Prosthodont 2003;16:381–384.