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Distributed crack analysis of ceramic inlays
M C Peters1, J H de Vree, W A Brekelmans
1Department of Cariology and Endodontology, TRIKON: Institute for Dental Clinical Research, University of Nijmegen, The Netherlands.
Journal of Dental Research
|November 1, 1993
Summary
Cracks in ceramic dental inlays can lead to fracture. This study used finite-element analysis to show that internal cracks in porcelain MOD inlays begin before visible signs appear, around 55-60% of fracture load.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials
Background:
- All-ceramic restorations face challenges with crack formation and propagation, potentially leading to intra-oral fracture.
- Understanding crack behavior is crucial for improving the longevity and reliability of dental restorations.
Purpose of the Study:
- To calculate damage in porcelain (porcelain-fused-to-metal) inlays using a finite-element (FE) implementation of distributed crack theory.
- To investigate the initiation point and load at which cracks form in ceramic inlays.
Main Methods:
- Utilized a finite-element (FE) implementation of the distributed crack theory.
- Simulated damage and crack initiation in a porcelain MOD inlay under load.
- Defined 'damage' as a parameter quantifying local stiffness reduction due to microdefects.
Main Results:
- Crack initiation in the simulated MOD ceramic inlay began at the internal occlusal surface near the pulpo-axial line angle.
- This internal crack initiation was undetectable from the external surface.
- Crack initiation occurred at 55-60% of the loading required for complete fracture.
Conclusions:
- Finite-element techniques provide valuable insights into fracture mechanics of loaded ceramic inlays.
- Internal crack initiation in ceramic inlays can occur below detectable clinical thresholds.
- FE analysis offers potential for advanced studies, including 3D modeling and cyclic loading.