Dentin Formation in Dentistry
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Questions and Answers

What is the primary role of odontoblasts in dentin formation?

  • Forming enamel spindles responsible for sensitivity sensation
  • Generating an extracellular collagen matrix (correct)
  • Producing cementum in the root
  • Secreting enamel in the crown
  • What gives dentin the capability of reacting to physiologic and pathologic stimuli?

  • Cementum formation
  • Odontoblastic cell processes (correct)
  • Enamel spindles
  • Tomes fibers
  • Where are the cell bodies of odontoblasts located?

  • In the pulp cavity (correct)
  • Adjacent to ameloblasts
  • Within the enamel spindles
  • In the tubules of mineralized dentin
  • What is the composition of mature dentin?

    <p>45% - 50% inorganic, 30% organic, 25% water</p> Signup and view all the answers

    What are small lateral openings along the tubule walls called?

    <p>Canaliculi</p> Signup and view all the answers

    When does dentin formation begin in relation to enamel formation?

    <p>Before enamel formation</p> Signup and view all the answers

    What causes the formation of lateral canals in dentin?

    <p>Presence of secondary branches of adjacent odontoblastic processes</p> Signup and view all the answers

    At which junction does the transition between enamel and dentin occur?

    <p>Dentinoenamel junction (DEJ)</p> Signup and view all the answers

    What is the unmineralized zone of dentin next to the cell bodies of odontoblasts called?

    <p>Predentin</p> Signup and view all the answers

    What is the name of the small canals that extend through the entire width of dentin, from the pulp to the DEJ?

    <p>Dentinal tubules</p> Signup and view all the answers

    In mature dentin, how far does the odontoblastic process extend within the dentinal tubule?

    <p>About one-third the dentinal thickness</p> Signup and view all the answers

    At what rate does dentin formation spread from areas subjacent to the cusp tip or incisal ridge to the apex of the root?

    <p>~4 μm/day</p> Signup and view all the answers

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