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- W4225828254 abstract "To investigate the fatigue behavior of restored teeth, in particular the mechanisms of longitudinal dentinal cracking under cyclic mechanical loading, using finite element analysis (FEA) and the stress-life (S-N) approach. Ten root-filled premolars restored with resin composites were subjected to step-stress cyclic loading to produce longitudinal cracks. Fracture loads and number of cycles completed at each load level were recorded. Finite element analysis (FEA) was used to predict the stress amplitude of each component under the global cyclic load. Both intact and debonded conditions were considered for the dentin-composite interface in the FEA. The predicted stress concentrations were compared with the fracture patterns to help elucidate the failure mechanisms. The stress-life approach was further used to predict the lifetimes of the different components in the restored teeth. Cumulative fatigue damage was represented by the sum of the fractions of life spent under the different stress amplitudes. Longitudinal cracks were seen in ~50% of the samples with a mean fracture load of 77045 N and a mean number of cycles to failure of 3229712624. The longitudinal dentinal cracks seemed to start near the line angle of the cavity, and propagated longitudinally towards the root. The sum of fractions of life spent for the dentin-composite interface exceeded 1 after ~7000 cycles when that for dentin was much lower that 1, indicating that interfacial debonding would occur prior to dentin fracture. This was confirmed by micro-CT images showing widened interfacial space in the cracked samples. In the debonded tooth, FEA showed dentinal stress concentrations at the gingival wall of the cavity, which coincided with the longitudinal cracks found in the cyclic loading test. The sum of fractions of life spent for dentin was close to 1 at ~30000 cycles, similar to the experimental value. Debonding of the dentin-composite interface occurred prior to longitudinal cracking of dentin in root-filled teeth under cyclic loading. The approximate time of occurrence for these events could be estimated using fatigue analysis with stresses provided by FEA.Download : Download high-res image (498KB)Download : Download full-size image" @default.
- W4225828254 created "2022-05-05" @default.
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- W4225828254 date "2022-01-01" @default.
- W4225828254 modified "2023-09-26" @default.
- W4225828254 title "Fatigue Analysis of Restored Teeth Longitudinally Cracked Under Cyclic Loading" @default.
- W4225828254 doi "https://doi.org/10.1016/j.dental.2021.12.133" @default.
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