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Approximate relative fatigue life estimation methods for thin-walled monolithic ceramic crowns
Sadia Nasrin1, Noriko Katsube1, Robert R Seghi2
1Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH, USA.
Summary
A new method estimates the fatigue life of dental restorations under simulated chewing forces. This approach uses ceramic fatigue data to predict restoration longevity, aiding material selection and design.
Area of Science:
- Biomaterials Science
- Dental Materials
- Mechanical Engineering
Background:
- Thin-walled monolithic restorations are susceptible to fatigue failure under masticatory loads.
- Accurate prediction of restoration fatigue life is crucial for clinical success and material development.
- Existing methods may not adequately account for the complex stress states and material properties involved.
Purpose of the Study:
- To develop an approximate method for estimating the relative fatigue life of thin-walled monolithic restorations.
- To simulate mastication loads and assess the fatigue behavior of various dental ceramics.
- To establish a universally applicable fatigue equation for dental ceramics.
Main Methods:
- Compiled and analyzed experimental fatigue data (fluormica, leucite, lithium disilicate, yttrium-stabilized zirconia) from literature.
- Developed an approximate fatigue life model by simplifying stress analysis and focusing on high-stress regions.
- Validated the model using experimental data from a trilayer restoration model with ceramic lithium disilicate (LD).
Main Results:
- Ceramic fatigue behavior was consistent across clinically relevant loading ranges and mastication frequencies.
- An approximate fatigue equation was derived, applicable to a broad spectrum of dental ceramics.
- The estimation method, incorporating fast fracture parameters and high-stress area, was preliminarily verified.
Conclusions:
- The developed method offers a reasonable preliminary estimation of relative restoration life.
- It highlights the critical roles of maximum stress, high-stress area, and surface preparation in restoration longevity.
- While not a substitute for clinical studies, this approach aids in understanding and predicting restoration performance.
Keywords:
CeramicFatigueFinite element analysisInterface-initiated fractureLife predictionMasticationMinimally invasive dentistryMonolithic crownMore Related Videos
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