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Fracture Toughness of Short Fibre-Reinforced Composites-In Vitro Study. | LitMetric

AI Article Synopsis

  • The study investigates the fracture toughness of a short fibre-reinforced composite (sFRC) at different thicknesses (2 mm, 3 mm, and 4 mm) to determine its suitability for dental applications.
  • Results indicated that the EXF variant had significantly greater fracture toughness than the EXP variant, especially at 2 mm depth, which is crucial for ensuring durability in dental restorations.
  • Both materials displayed similar performance at deeper thicknesses, with findings suggesting that sFRCs mimic dentine's properties and could effectively replace dentine in dental restorations.

Article Abstract

The development of dental materials needs to be supported with sound evidence. This in vitro study aimed to measure the fracture toughness of a short fibre-reinforced composite (sFRC), at differing thicknesses. In this study, 2 mm, 3 mm and 4 mm depths of sFRC were prepared. Using ISO4049, each preparation was tested to failure. A total of 60 samples were tested: 10 samples for each combination of sFRC and depth. Fractured samples were viewed, and outcomes were analysed. EXF showed greater toughness than EXP, with a mean of 2.49 (95%CI: 2.25, 2.73) MPa.m compared to a mean of 2.13 (95%CI: 1.95, 2.31) MPa.m, (F(1,54) = 21.28; < 0.001). This difference was particularly pronounced at 2 mm depths where the mean (95%CI) values were 2.72 (2.49, 2.95) for EXF and 1.90 (1.78, 2.02) for EXP (Interaction F(2,54) = 7.93; < 0.001). Both materials performed similarly at the depths of 3 mm and 4 mm. The results for both materials were within the accepted fracture toughness values of dentine of 1.79-3.08 MPa.m. Analysis showed crack deflection and bridging fibre behaviour. The optimal thickness at the cavity base for EXF was 2 mm and for EXP 4 mm. Crack deflection and bridging behaviour indicated that restorations incorporating sFRCs are not prone to catastrophic failure and confirmed that sFRCs have similar fracture toughness to dentine. sFRCs could be a suitable biomimetic material to replace dentine.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547670PMC
http://dx.doi.org/10.3390/ma17215368DOI Listing

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