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Related Experiment Videos

Fatigue behavior of packable composites.

Y Abe1, M J A Braem, Paul Lambrechts

  • 1Leuven BIOMAT research cluster- Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, Leuven 3000, Belgium.

Biomaterials
|December 29, 2004
PubMed
Summary

Packable composites showed varied flexural fatigue limits (FFL), with some performing significantly lower than other composite types. Clinical assessment is crucial for their appropriate use in posterior teeth restorations.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Polymer Science

Background:

  • Packable composites are widely used in dental restorations.
  • Understanding their long-term performance, particularly flexural fatigue behavior, is critical for clinical success.
  • Previous research has focused on static properties, with less emphasis on fatigue resistance.

Purpose of the Study:

  • To investigate the flexural fatigue behavior of eleven different packable composite materials.
  • To determine the flexural fatigue limit (FFL) and clamped fracture strength of these materials.
  • To correlate material properties like elastic modulus and filler fraction with fatigue performance.

Main Methods:

  • Thirty rectangular samples (1.2 x 5 x 35 mm) per material were prepared for flexural fatigue testing.

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  • Materials were aged in water at 37°C for one month prior to testing.
  • A custom-made fatigue machine was used to determine clamped fracture strength and FFL.
  • Statistical analysis included one-way ANOVA, Bonferroni/Dunn's test, and regression analysis.

    • Main Results:

    • Flexural fatigue limits (FFL) of tested packable composites were significantly lower than those of compact-filled densified composites.
    • Three materials exhibited FFLs significantly lower than microfine composites.
    • Statistically significant relationships were found between elastic modulus, volumetric filler fraction, and fatigue performance (R²=0.974, p=1.990 x 10⁻⁷).

    Conclusions:

    • There is significant diversity in the flexural fatigue behavior among packable composite materials.
    • The FFL of some packable composites is notably lower than other composite types, raising concerns for posterior restorations.
    • Clinical judgment is essential for selecting appropriate packable composites for posterior teeth based on their fatigue resistance and material properties.