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Fatigue analysis of restored teeth longitudinally cracked under cyclic loading
Fei Lin1, Ronald Ordinola-Zapata2, Ning Ye3
1Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Summary
Restored teeth can experience longitudinal cracks due to cyclic loading. Finite element analysis (FEA) and fatigue analysis predict that the dentin-composite interface may debond before dentin fractures, aiding in evaluating restoration longevity.
Area of Science:
- Biomaterials Science
- Dental Mechanics
- Computational Mechanics
Background:
- Restored teeth are susceptible to fatigue failure under cyclic mechanical loading.
- Longitudinal dentinal cracking is a significant concern in the longevity of dental restorations.
Purpose of the Study:
- To investigate the fatigue behavior of root-filled teeth restored with resin composites.
- To elucidate the mechanisms of longitudinal dentinal cracking under cyclic loading.
- To evaluate the predictive capability of finite element analysis (FEA) and the stress-life (S-N) approach for restoration longevity.
Main Methods:
- Ten root-filled premolars restored with resin composites underwent step-stress cyclic loading.
- Fracture loads and cycles to failure were recorded.
- FEA was employed to predict stress amplitudes, considering both intact and debonded dentin-composite interfaces.
- The S-N approach was used to estimate component lifetimes and cumulative fatigue damage.
Main Results:
- Approximately 50% of samples exhibited longitudinal cracks, with a mean fracture load of 770 N and mean cycles to failure of 32,297.
- Cracks initiated near the cavity line angle and propagated longitudinally.
- Fatigue analysis indicated interfacial debonding occurred before dentin fracture (~7000 cycles).
- FEA revealed stress concentrations at the gingival wall in debonded teeth, correlating with observed cracks.
Conclusions:
- Debonding of the dentin-composite interface may precede longitudinal dentinal cracking in restored, root-filled teeth under cyclic loading.
- FEA combined with fatigue analysis can estimate the timing of these failure events.
- This methodology offers a valuable tool for assessing the longevity of various restoration designs.
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