Enamel Development and Amelogenesis
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Questions and Answers

What is the approximate time it takes to complete the crown of a permanent tooth?

  • 10 years
  • 7 years
  • 5 years (correct)
  • 2 years

    • What is the role of ameloblasts in amelogenesis?

  • To produce mature enamel directly
  • To remove water, proteins, and other organic materials
  • To grow hydroxyapatite crystals
  • To produce a special protein scaffold (correct)

    • What happens during the maturation stage of amelogenesis?

  • Ameloblasts remove water, proteins, and other organic materials (correct)
  • The tooth crown is fully formed
  • Hydroxyapatite crystals start to grow
  • Ameloblasts produce a special protein scaffold

    • What is the main component that grows in the protein scaffold during amelogenesis?

    <p>Hydroxyapatite crystals</p> Signup and view all the answers

    What is the function of the Tomes' processes in enamel formation?

    <p>To shape the enamel rod</p> Signup and view all the answers

    What is the percentage of time taken up by the maturation stage in the process of producing a full crown of enamel?

    <p>Up to two thirds</p> Signup and view all the answers

    At which stage of tooth development does the enamel organ form?

    <p>Bud stage</p> Signup and view all the answers

    What is the primary function of the cells in the inner enamel epithelium during the morphogenetic phase?

    <p>To shape the future crown</p> Signup and view all the answers

    During which phase do the inner enamel epithelium cells differentiate into ameloblasts?

    <p>Histodifferentiation phase</p> Signup and view all the answers

    At approximately which week of embryonic development does the bell stage occur?

    <p>11th week</p> Signup and view all the answers

    What is the term for the process of enamel development?

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

    What is the function of the stellate reticulum during tooth development?

    <p>To regulate the movement of cells and ions</p> Signup and view all the answers

    What is the main function of Tomes' process in amelogenesis?

    <p>To stagger protein secretion into two parts, forming prisms and interprismatic regions</p> Signup and view all the answers

    What is the result of the stellate reticulum collapsing during the secretory phase?

    <p>The surrounding vascular tissue moves closer to the ameloblasts</p> Signup and view all the answers

    What is the percentage of final enamel hardness achieved during the secretory phase?

    <p>30%</p> Signup and view all the answers

    What do ameloblasts secrete during the secretory phase?

    <p>Enamel matrix proteins</p> Signup and view all the answers

    What is the main component of enamel matrix proteins?

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

    What is the function of the stratum intermedium during the secretory phase?

    <p>To support the ameloblasts</p> Signup and view all the answers

    What happens to the reduced enamel epithelium as a tooth erupts?

    <p>It merges with the oral epithelium</p> Signup and view all the answers

    What is the function of the junctional epithelium?

    <p>To act as a seal from the oral environment</p> Signup and view all the answers

    What remains of the reduced enamel epithelium after a tooth erupts?

    <p>Only the cervical portions remain</p> Signup and view all the answers

    What do ameloblasts secrete during the late maturation stage of amelogenesis?

    <p>Enamel matrix protein-digesting enzymes</p> Signup and view all the answers

    What happens to most of the reduced enamel epithelium during tooth eruption?

    <p>It gets destroyed</p> Signup and view all the answers

    What is the effect of ameloblasts removing water from the developing enamel during the late maturation stage?

    <p>Increasing the mineral content of the maturing tissue</p> Signup and view all the answers

    What is the fate of the cervical portions of the reduced enamel epithelium?

    <p>They become the junctional epithelium</p> Signup and view all the answers

    At which stage of amelogenesis is enamel most susceptible to fluoride and tetracycline?

    <p>Late maturation stage</p> Signup and view all the answers

    What is the function of the reduced enamel epithelium?

    <p>To protect and cover the outer surface of the enamel until tooth eruption occurs</p> Signup and view all the answers

    What is the relationship between the reduced enamel epithelium and the oral epithelium during tooth eruption?

    <p>They merge together</p> Signup and view all the answers

    What is the characteristic of ameloblasts during the late maturation stage of amelogenesis?

    <p>They cycle between the early and late maturation stages repeatedly</p> Signup and view all the answers

    What occurs after the completion and full maturation of the enamel?

    <p>The enamel organ collapses into a dense covering of epithelium</p> Signup and view all the answers

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