Dentin, also known as dentine, is a vital component of teeth found in various animals, including humans. It constitutes the majority of a tooth's structure and plays a critical role in tooth function. Dentin is distinct from enamel and bone, possessing unique characteristics that make it essential for tooth health and sensitivity.
Key features of dentin include:
In nonmammalian vertebrates, such as reptiles and fish, enamel is absent. Instead, the tooth crown is covered by a substance called vitrodentin, which is related to dentin but harder than dentin while still softer than enamel.
Some animals, like flounder and cod, have vasodentin, a type of dentin that lacks tubules and receives nourishment directly from capillaries. Although it is more efficient in terms of nutrition, vasodentin is softer and less resistant to diseases compared to tubular dentin. The toothlike scales found in sharks and related fish are also referred to as dentin.
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