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Related Concept Videos

Fatigue01:21

Fatigue

226
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
226
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

258
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
258

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Accelerated Fatigue Model for Predicting Composite Restoration Failure.

B Yang1, W Aregawi2, R Chen2

  • 1Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.

Journal of Dental Research
|October 6, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a new laboratory method to predict how well resin composite dental restorations will perform in patients. Accelerated fatigue testing on chemically degraded specimens accurately forecasts clinical failure rates for dental composites.

Keywords:
bondingdegradationmathematical modelingmechanical propertiesresin(s)restorative materials

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Mechanical Engineering

Background:

  • Dental composite restorations are widely used but have variable clinical longevity.
  • Predicting the clinical performance of these restorations remains a challenge.
  • Existing laboratory tests may not fully replicate clinical degradation and stress conditions.

Purpose of the Study:

  • To develop and validate an empirical method for predicting the clinical performance of resin composite dental restorations.
  • To assess the efficacy of laboratory-derived data from chemical degradation and accelerated cyclic fatigue in forecasting clinical failure.
  • To establish a correlation between laboratory testing parameters and real-world clinical outcomes.

Main Methods:

  • Bovine dentin disks were restored with three different resin composites.
  • Specimens underwent chemical degradation (low-pH challenge) and subsequent diametral compression testing (fast fracture or accelerated fatigue).
  • A predictive model was established using data from one material and then applied to predict the clinical failure of the other two materials.

Main Results:

  • Accelerated fatigue testing proved more effective than fast fracture strength in differentiating material performance after chemical degradation.
  • Linear relationships were observed between laboratory fatigue life and clinical time to failure for the calibration material.
  • Predictions of clinical failure for the other two materials showed the best agreement with clinical data when using results from specimens subjected to 48 hours of low-pH challenge.

Conclusions:

  • An accelerated fatigue model, when applied to chemically aged specimens, can successfully predict the clinical failure of resin composite restorations.
  • The proposed empirical method offers a promising approach for evaluating the long-term clinical performance of dental restorative materials.
  • Optimizing laboratory testing conditions, including chemical aging, is crucial for accurate clinical performance prediction.