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Stress Distribution in All-Ceramic Posterior 4-Unit Fixed Dental Prostheses Supported in Different Ways: Finite
Annike Rand1, Philipp Kohorst, Andreas Greuling
1*Research Associate, Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany. †Professor, Head of Department of Prosthetic Dentistry and Biomaterials, Saarland University Faculty of Medicine, Homburg, Germany. ‡Head of Materials Research Lab, Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany. §Research Associate, Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany. ¶Professor, Head of Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
Finite element analysis (FEA) of zirconia fixed dental prostheses (FDPs) revealed that more rigid support systems reduce tensile stresses. This FEA complements in vitro studies on FDP load-bearing capacity.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Dental Prosthodontics
Background:
- Zirconia posterior 4-unit fixed dental prostheses (FDPs) are crucial in restorative dentistry.
- Understanding abutment resilience's impact on FDP load-bearing capacity is vital for clinical success.
Purpose of the Study:
- To complement previous in vitro studies using finite element analysis (FEA).
- To investigate the influence of abutment resilience on the load-bearing capacity of zirconia posterior 4-unit FDPs.
Main Methods:
- Finite element analysis (FEA) was employed to model three virtual specimens.
- Specimens simulated FDP support by teeth with periodontal resilience, tooth-implant combination, or implants only.
- Vertical occlusal load was applied, and maximum principal stresses (MPSs) were computed.
Main Results:
- The highest MPSs were consistently found in the basal region of the middle framework connector.
- Tensile stresses were significantly lower in models with more rigid FDP support.
- FEA-derived MPSs correlated well with experimentally determined FDP load-bearing capacities.
Conclusions:
- Finite element analysis (FEA) is a suitable method for confirming in vitro study findings.
- FEA provides valuable insights into stress distributions within all-ceramic posterior FDPs.
- Rigid support enhances the mechanical integrity and load-bearing capacity of zirconia FDPs.
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