IADR Abstract Archives
Influence of design and material on load bearing capacity of fixed dental prosthesis; a finite element analysis
Objectives: This study was directed to compare between different tooth supported fixed dental prostheses "FDP" designs (pier abutment and cantilever designs) and its effect on stress distribution through using different restorative materials (PEEK, zirconia, Porcelain fused to metal)
Methods: Three dimensional (3D) finite element model was constructed for both designs: pier abutment design and cantilever design. Different upper fixed dental prostheses including the abutments(upper canine, premolar, and molar) and other components such as retainers, connectors, pontic, and gingiva were created in "Autodesk inventor" version 8 (Core i7, 5500U CPU processor, 2.4 GHz, 6 GB RAM) then exported as SAT file. Then these components are assembled in ANSYS environment (computer Intel Pentium Core 2 Duo, processor 3.0 GHz, 4.0 GB RAM). The proposed FDP materials are Porcelain fused to metal"PFM", Zirconia, and Poly-Ether-Ether-Ketone.Six finite element modelswere preparedfor different designs.Pier abutment designs(conventional rigid connector fixed-fixed 5 units pier abutment,5 units pier abutment with telescopic crown, 5 units pier abutment with precision attachment, pier abutment design with cantilever end)and cantilever designs (2 units& 3 units design).Total of eighteen runs (Stress analysis and stress distribution) were performed. Three runs for each model(using different restorative materialsPFM, zirconia and PEEK) were done where the vertical loading was applied.
Results: Data of three restorative materials showed and representedas Von Mises stress for maximum value of stresses. Similarly, PFM and zirconia"FDP" behaved close to each other while the PEEK one transferred much more load to"FDP" components and the underneath structures.Moreover, total deformation of bone was increased when using PEEK as "FDP" material than with zirconia and PFM.
Conclusions: PEEK is liable to higher deformation and delivered unacceptable stress to surrounding vital structure such as the bone. As a result, this may cause fatigue failure by time.
Methods: Three dimensional (3D) finite element model was constructed for both designs: pier abutment design and cantilever design. Different upper fixed dental prostheses including the abutments(upper canine, premolar, and molar) and other components such as retainers, connectors, pontic, and gingiva were created in "Autodesk inventor" version 8 (Core i7, 5500U CPU processor, 2.4 GHz, 6 GB RAM) then exported as SAT file. Then these components are assembled in ANSYS environment (computer Intel Pentium Core 2 Duo, processor 3.0 GHz, 4.0 GB RAM). The proposed FDP materials are Porcelain fused to metal"PFM", Zirconia, and Poly-Ether-Ether-Ketone.Six finite element modelswere preparedfor different designs.Pier abutment designs(conventional rigid connector fixed-fixed 5 units pier abutment,5 units pier abutment with telescopic crown, 5 units pier abutment with precision attachment, pier abutment design with cantilever end)and cantilever designs (2 units& 3 units design).Total of eighteen runs (Stress analysis and stress distribution) were performed. Three runs for each model(using different restorative materialsPFM, zirconia and PEEK) were done where the vertical loading was applied.
Results: Data of three restorative materials showed and representedas Von Mises stress for maximum value of stresses. Similarly, PFM and zirconia"FDP" behaved close to each other while the PEEK one transferred much more load to"FDP" components and the underneath structures.Moreover, total deformation of bone was increased when using PEEK as "FDP" material than with zirconia and PFM.
Conclusions: PEEK is liable to higher deformation and delivered unacceptable stress to surrounding vital structure such as the bone. As a result, this may cause fatigue failure by time.