ArticleDental materials : official publication of the Academy of Dental Materials2022
Fatigue analysis of restored teeth longitudinally cracked under cyclic loading.
Article in Dental materials : official publication of the Academy of Dental Materials, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 22 citations in OpenAlex.
- Combined effects of ageing and type 2 diabetes mellitus on human dental mechanics.GeroScience · 2026Article
- AI-driven automation of occlusal surface design in digital prosthodontics: a clinically validated workflow.BMC oral health · 2026Article
- Investigation of Stress Distribution and Fatigue Performance in Restored Teeth Using Different Thicknesses of Adhesive Materials and Different Restorative Materials: 3D Finite Element Analysis (FEM).Materials (Basel, Switzerland) · 2025Article
- Structural response of mandibular first molars in the presence of proximal contacts: finite element analysis with antagonist teeth and alternative loading applications.Clinical oral investigations · 2025Article
- Article
- The stress distribution of a primary molar tooth restored with stainless steel crown using different luting cements.BMC oral health · 2024Article
- Effects on different full-coverage designs and materials of crack propagation in first mandibular molar: an extended finite element method study.Frontiers in bioengineering and biotechnology · 2023Article
- Biomechanical Modelling for Tooth Survival Studies: Mechanical Properties, Loads and Boundary Conditions-A Narrative Review.Materials (Basel, Switzerland) · 2022Review
- Vertical root fracture resistance and crack formation of root canal-treated teeth restored with different post-luting systems.Odontology · 2022Article
- A critical analysis of research methods and experimental models to study the load capacity and clinical behaviour of the root filled teeth.International endodontic journal · 2022Review
Corrections and comments
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Authors and funding
5 authors at 3 institutions in 2 countries.
Funding
Abstract
objectiveTo 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.
methodsTen 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. 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 S-N 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.
resultsLongitudinal cracks were seen in ~50% of the samples with a mean fracture load of 770 ± 45 N and a mean number of cycles to failure of 32,297 ± 12,624. 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 than 1, indicating that interfacial debonding would occur prior to dentin fracture. This was supported 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 ~30,000 cycles, similar to the experimental value. SIGNIFICANCE: Debonding of the dentin-composite interface may occur 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. This methodology can therefore be used to evaluate the longevity of restoration designs for root-filled teeth.
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