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Enamel crystallites in the head of the enamel rod are oriented parallel to the long axis of the rod. [2] [5] When found in the tail of the enamel rod, the crystallites' orientation diverges slightly (65 degrees) from the long axis. [2] The arrangement of enamel rods is understood more clearly than their internal structure.
The enamel organ grows around a cluster of neuro-mesenchymal stem cells known as the dental papilla. Initially, a basement membrane separates the two. The first visible sign of differentiation ← occurs when the cuboidal IEE cells next to the dental papilla elongate, becoming more columnar in shape.
All mammalian teeth share a similar structure: 1) the enamel crown, formed by epithelial cells; 2) the dentin found underlying the enamel, formed by mesenchymal cells and containing a large collagen component; 3) the pulp, the organ generating/supplying the dentin-forming cells (odontoblasts), and also containing vasculature and nerve supply; 4) the root, comprised primarily by the dentin, but ...
Sep 23, 2015 · When did the enamel that covers our teeth evolve? And where in the body did this tissue first appear? In a new study, researchers combined data from two very different research fields ...
Jan 4, 2015 · Enamel is the hardest substance in the vertebrate body. Enamel contains about 96% mineral, 2% organic material, and 2% water, by weight. The mineral component, as in all other vertebrate mineralized tissues, is hydroxyapatite, Ca 10 (PO 4) 6 (OH) 2. Like other mineralized tissues, some of the calcium, phosphate, and hydroxyl ions of the enamel ...
Jan 5, 2015 · Fully formed enamel consists of approximately 96% mineral and 4% organic material and water (Table 7-1). The inorganic content of enamel is a crystalline calcium phosphate (hydroxyapatite) substituted with carbonate ions, which also is found in bone, calcified cartilage, dentin, and cementum.
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Sep 29, 2015 · To trace the stages in enamel evolution, they inspected fossils of three species of ancestral bony fish dating from late in the Silurian Period (about 425 million years ago). Lophosteus, a species found in Swedish rocks, had no enamel at all. Andreolepis, also from Sweden, had enamel only on the denticles behind its head, not on its teeth or ...
