Morphology and fracture of enamel

Sangwon Myoung, James Lee, Paul Constantino, Peter Lucas, Herzl Chai, Brian Lawn

Research output: Contribution to journalArticlepeer-review


This study examines the inter-relation between enamel morphology and crack resistance by sectioning extracted human molars after loading to fracture. Cracks appear to initiate from tufts, hypocalcified defects at the enamel-dentin junction, and grow longitudinally around the enamel coat to produce failure. Microindentation corner cracks placed next to the tufts in the sections deflect along the tuft interfaces and occasionally penetrate into the adjacent enamel. Although they constitute weak interfaces, the tufts are nevertheless filled with organic matter, and appear to be stabilized against easy extension by self-healing, as well as by mutual stress-shielding and decussation, accounting at least in part for the capacity of tooth enamel to survive high functional forces.

Original languageEnglish
Pages (from-to)1947-1951
Number of pages5
JournalJournal of Biomechanics
Issue number12
StatePublished - 25 Aug 2009


  • Dentistry
  • Enamel
  • Evolutionary biology
  • Fracture
  • Microindentation
  • Tufts


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