Relationship between composite fracture toughness and bond strengths to enamel and dentine

Aust Dent J. 2012 Sep;57(3):319-24. doi: 10.1111/j.1834-7819.2012.01704.x. Epub 2012 Jun 24.


Background: This study aimed to evaluate the association between the fracture toughness of two nanofilled-hybrid resin composites (Clearfil Majesty Esthetic [CME], Kuraray Medical, Japan; Estelite Σ [ES], Tokuyama, Japan) and their bond strengths to enamel and dentine mediated by a self-etching primer system (Clearfil SE Bond [CSE]; Kuraray).

Methods: Twenty-four permanent human molars were sectioned into enamel and dentine specimens and finished with 600-grit silicon carbide paper, bonded with CSE and either CME or ES, for μ-shear bond strength (μSBS) and μ-tensile bond strength (μTBS). The specimens were tested until failure at a cross-head speed of 1 mm/min, failure loads recorded, bond strengths calculated and results analysed using independent samples t-tests. Eight single-notched bar-shaped specimens, 30 mm × 5.2 mm × 2.2 mm, were prepared for each resin composite and fracture toughness measured using four-point bending at a cross-head speed of 0.5 mm/min. Results were analysed using independent samples t-tests.

Results: For μSBS and μTBS, there was no significant difference between the resin composites for enamel or dentine. The fracture toughness of CME was significantly higher than that of ES.

Conclusions: For both enamel and dentine, resin composite fracture toughness affected neither μTBS nor μSBS to enamel or dentine.

MeSH terms

  • Acid Etching, Dental / methods
  • Composite Resins / chemistry*
  • Dental Bonding / methods*
  • Dental Enamel / chemistry*
  • Dental Stress Analysis
  • Dentin / chemistry*
  • Dentin-Bonding Agents / chemistry*
  • Humans
  • Materials Testing
  • Methacrylates
  • Microscopy, Electron, Scanning
  • Shear Strength
  • Surface Properties
  • Tensile Strength


  • Composite Resins
  • Dentin-Bonding Agents
  • Methacrylates