Grayson W. Marshall

TL;DR: Emphasis was placed on the major structural components of the tissue, including the collagen based organic matrix and its mineral reinforcement, the distribution of these components and their microstructural organization as related to mechanical properties and response to demineralization.

TL;DR: A critical re-evaluation of the literature indicates that the magnitudes of the elastic constants of dentin must be revised considerably upward, and the large coefficients of variation cited in all strength studies can be understood in terms of a distribution of flaws within the dentin specimens.

TL;DR: Atomic force microscopy (AFM) combined with a nano-indentation technique was used to reveal the structure and to perform site-specific mechanical testing of the enamel of third molars and the observed anisotropy of enamel is related to the alignment of fibre-like apatite crystals and the composite nature ofEnamel rods.

TL;DR: The critical role of this region, in preventing cracks formed in enamel from traversing the interface and causing catastrophic tooth fractures, is not associated with the crack-arrest capabilities of the interface itself; rather, cracks tend to penetrate the (optical) DEJ and arrest when they enter the tougher mantle dentin adjacent to the interface due to the development of crack-tip shielding from uncracked-ligament bridging.

TL;DR: The results suggest that the dentinoenamel junction displays a gradient in structure and that nanoindenation methods show promise for further understanding its structure and function.