Tooth Structure and Evolution. Tooth Anatomy. Enamel – Composed of crystals of hydroxyapatite [3(Ca 3 PO 4 ) 3 * Ca(OH) 2 ] Enamel is the hardest tissue in the body
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Enamel is the hardest tissue in the body
Cementum is rich in collagen fibers and is softer than dentine.
Incisors of rodents
Cheek teeth of some rodents
All teeth of rabbits except 2nd pair of incisors
Upper incisors of elephants – all dentine tusks
Upper canines of the walrus
Left incisor of male narwhal
Reductions in this number are common. Increases are rare. The giant armadillo, African bat eared fox, most toothed whales have more than 44 teeth.
Differentiation Theory (Cope-Osborn Theory)