Objective: The aim of this study is to evaluate effect different pontic framework designs on fracture resistance of implant supported monolithic zirconia and Polyether ether ketone (PEEK) fixed partial prosthesis embedded in poly urethane foam blocks (20 pounds per cubic foot (PCF)).
Material and Methods: The study conducted to assess fracture resistance of 4 units implant supported fixed partial denture replacing missing second premolar and first molar, the pontic constructed to replace the second premolar and first molar. A total of 40 implants used in the present research, in 40 osteotomies in the polyurethane blocks resembling bone structure. Specimens divided according to material of construction into zirconium (n=10) and PEEK (n=10), then sub divided into two subgroups according to pontic design.
Results: From the test results modified ridge lap showed better results than sanitary design. Zirconium as a material showed the higher results than PEEK upon testing p≤0.05. All the tested materials were fallen within the acceptable range to function under mastication.
Conclusions: Zirconia and PEEK are material of choice when planning for long span bridges for their high fracture strength values. Despite of the restorative material used pontic shape and occlusal - gingival height have a great influence on fracture resistance and behavior of the material as well as stress distribution.