Evaluating the Fracture Resistance of Fiber Reinforced Composite Restorations - An in vitro Analysis

Indian J Dent Res. Jan-Feb 2020;31(1):138-144. doi: 10.4103/ijdr.IJDR_465_18.


Background: Laboratory reports show that fiber-reinforced composites have improved fracture resistance over traditional composites. However, limitations in the biomechanics of tests to evaluate the fracture resistance of fiber-reinforced composites need to be considered for accurate clinical applications.

Aim: To assess the fracture resistance of particulate filler composites, glass fiber-reinforced composites, and polyethylene-fiber reinforced composites by analyzing the different fracture types and failure patterns.

Materials and methods: A standardized incisal (Group I) and mesioincisal fractures (Group II) were prepared on human maxillary central incisors. The test samples were further subdivided according to the restorative material used; particulate filler composites (Filtek Z 250), glass fiber-reinforced composites (fibre splint), and polyethylene-reinforced composites (Ribbond). The type of fractures was evaluated under the stereomicroscope and the failure patterns were analyzed using the graphical output from Universal Testing Machine.

Statistical analysis: The Chi-square test of association was used to test the association between fiber-reinforced composites and fracture resistance of tooth restoration complex.

Results: No statistical association was observed between fiber-reinforced composites to the type of fractures in both incisal (P = 0.29) and mesioincisal restoration (P = 0.27). A significant association was observed between the fiber-reinforced composites to the failure patterns in both the incisal (P = 0.005) and mesioincisal restoration (P = 0.007).

Conclusion: The glass and polyethylene fiber-reinforced composites showed improved fracture resistance properties than the traditional particulate filler composites in both incisal and mesioincisal restorations.

Keywords: Catastrophic failures; fibre reinforced composites; statistical failures; tooth fractures; traumatic dental injuries.

MeSH terms

  • Composite Resins*
  • Dental Materials
  • Dental Restoration Failure
  • Dental Restoration, Permanent
  • Dental Stress Analysis
  • Glass
  • Humans
  • Materials Testing
  • Stress, Mechanical
  • Tooth Fractures*


  • Composite Resins
  • Dental Materials