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3D statistical failure analysis of monolithic dental ceramic crowns
Sadia Nasrin1, Noriko Katsube1, Robert R Seghi2
1Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH, USA.
Journal of Biomechanics
|May 25, 2016
Summary
Catastrophic failures in ceramic crowns often start at the cement interface, not the chewing surface. This study developed a 3D model to predict failure probability for monolithic ceramic crowns, improving dental restoration design.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Dental Materials
Background:
- Adhesively retained ceramic crowns frequently fail at the cement interface due to radial cracking.
- Understanding failure initiation is crucial for improving the longevity of dental restorations.
Purpose of the Study:
- To develop a 3D failure prognosis model for interface-initiated failures in monolithic ceramic crowns.
- To predict the failure probability of ceramic crowns under load.
Main Methods:
- Utilized finite element analysis to determine multi-axial stress states at the intaglio surface.
- Incorporated surface flaw distribution from biaxial flexural tests.
- Employed a fracture mechanics-based statistical failure probability model.
Main Results:
- Identified high flexural and interfacial shear stress in thin wall regions and high interfacial normal tensile stress at margins.
- Demonstrated the significant impact of cement modulus on stress distribution.
- Verified the model against 2D models and experimental data.
Conclusions:
- Failure probability is influenced by stress concentrations and cement bond degradation.
- The model can help detect potential design flaws in monolithic ceramic crowns.
- Further research is needed to explore cyclic loading effects on cement bond integrity.
