Facts about Dentin

1. 08

   Odontoblasts, the specialized cells that produce dentin, retain their cell bodies in the pulp while extending long cytoplasmic processes into the dentinal tubules throughout the tooth's life.

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2. 07

   Dentin's permeability allows dentists to use it as a pathway for therapeutic agents, with studies showing that calcium hydroxide penetrates dentin at approximately 0.5 millimeters per week when applied to the pulp chamber surface.

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3. 06

   Hydroxyapatite crystals comprise approximately 50 percent of dentin's dry weight, giving the material its hardness and ability to support the outer enamel layer throughout the tooth's lifetime.

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4. 05

   Reparative dentin produced in response to injury or cavity formation appears darker under microscopy due to fewer organized tubules and higher mineral content compared to normal dentin.

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5. 04

   Exposed dentin at the gum line causes tooth sensitivity because its tubules connect directly to the nerve tissue within the pulp chamber, allowing pain signals to travel rapidly to the brain.

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6. 03

   Secondary dentin forms throughout life at a rate of approximately 0.5 to 1 micrometer per year, gradually reducing the pulp chamber size in healthy teeth.

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7. 02

   Microscopic tubules extending from the pulp chamber to the outer dentin layer number approximately 30,000 to 90,000 per square millimeter, making dentin highly permeable to stimuli.

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8. 01

   Three times softer than tooth enamel, dentin comprises approximately 70 percent of the tooth structure by volume in adult humans.

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