This work investigates the mechanical properties of dental enamel across multiple length scales, from millimeters down to nanometers. The author, Siang Fung Ang, explores the structure-property relationship of enamel, which is composed of apatite fibers with minor organic and water content. The study quantifies enamel's elastic moduli, its elastic/inelastic transition, and identifies toughening mechanisms at various hierarchical levels. It further details how interrod regions dissipate more irreversible energy during creep than enamel rod regions, and quantifies crack tip toughness, cohesive stresses, and the cohesive zone size at the crack tip for enamel fracture.

This research provides a detailed, multi-scale analysis of dental enamel's mechanical behavior, crucial for advancing restorative and preventive dentistry. By quantifying properties like elastic moduli and fracture toughness, the work offers a foundational understanding for biomaterial development and dental treatment strategies. The study's focus on hierarchical structure-property relationships and energy dissipation mechanisms contributes significantly to the field of materials science as applied to biological tissues.