Oral and Maxillofacial Surgery
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Questions and Answers

What is the process called when a tooth develops from a few cells in the primitive oral cavity to an erupted tooth with crown and root?

  • Morphogenesis
  • Enamel formation
  • Odontogenesis (correct)
  • Amelogenesis

    • Which tissue covers the crown of the tooth?

  • Pulp
  • Cementum
  • Dentin
  • Enamel (correct)

    • Which stage of tooth development do ameloblasts develop from the inner dental epithelium and require communication with ectomesenchyme cells in order to differentiate?

  • Bud stage
  • Cap stage (correct)
  • Dental lamina
  • Bell stage

    • What are the principal stages of enamel development?

    <p>Secretion, transition, maturation</p> Signup and view all the answers

    What can cause disturbances in enamel formation?

    <p>All of the above</p> Signup and view all the answers

    Which stage of tooth development is characterized by the deepening of the undersurface of the enamel organ and the beginning of cellular histodifferentiation?

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

    What are the two morphologies of maturation stage ameloblasts?

    <p>Smooth-ended and ruffled-ended</p> Signup and view all the answers

    What is the composition of enamel during the secretion stage?

    <p>66% protein, 29% mineral, 5% water</p> Signup and view all the answers

    What is the formula for hydroxyapatite, the mineral found in enamel?

    <p>Ca10(PO4)6(OH)2</p> Signup and view all the answers

    Which stage of tooth development is characterized by the formation of the enamel organ?

    <p>Primary epithelial band</p> Signup and view all the answers

    What is the term for the process of enamel formation?

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

    What is the unique epithelial tissue that covers the crown of the tooth?

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

    Which stage of tooth development is characterized by the deepening of the undersurface of the enamel organ and the beginning of cellular histodifferentiation?

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

    What is the term for the process whereby a tooth develops from a few cells in the primitive oral cavity to an erupted tooth with crown and root?

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

    What are the two main types of cells involved in enamel formation?

    <p>Ameloblasts and Odontoblasts</p> Signup and view all the answers

    What can cause disturbances in enamel formation?

    <p>All of the above</p> Signup and view all the answers

    What is the formula for hydroxyapatite, the mineral found in enamel?

    <p>Ca10(PO4)6(OH)2</p> Signup and view all the answers

    Which stage of tooth development is characterized by cell proliferation and epithelium-mesenchyme interaction?

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

    During which stage of tooth development do ameloblasts secrete a unique extracellular matrix containing enamel proteins?

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

    What is the role of ameloblasts during enamel development?

    <p>All of the above</p> Signup and view all the answers

    What is the name of the process that creates structure in enamel and is responsible for the formation of enamel rods?

    <p>Tomes' process</p> Signup and view all the answers

    Which stage of tooth development is characterized by the loss of ameloblasts before the tooth erupts into the oral cavity?

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

    What can cause disturbances in enamel formation?

    <p>All of the above</p> Signup and view all the answers

    What is the composition of enamel during the maturation stage?

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

    What is the hardest tissue in the body?

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

    What is the formula for hydroxyapatite, the mineral found in enamel?

    <p>Ca10(PO4)6(OH)2</p> Signup and view all the answers

    What is the role of enamel tufts?

    <p>All of the above</p> Signup and view all the answers

    What is the role of enamel spindles?

    <p>All of the above</p> Signup and view all the answers

    During which stage of tooth development do ameloblasts secrete a basal lamina on the enamel surface and attach to it?

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

    What is the function of ameloblasts during the secretory stage of amelogenesis?

    <p>Production of most of the enamel matrix</p> Signup and view all the answers

    Which type of cells signal to each other using secreted proteins as instructions for differentiation during tooth development?

    <p>Epithelial and ectomesenchyme cells</p> Signup and view all the answers

    What is the composition of enamel during the maturation stage of amelogenesis?

    <p>95% mineral, 1% protein, 4% water</p> Signup and view all the answers

    What is the term given to the end of the ameloblast cell which lays down the crystals of the enamel matrix?

    <p>Tome's process</p> Signup and view all the answers

    Which stage of tooth development is characterized by the proliferation of epithelial cells perpendicular to the surface?

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

    What is the function of the reduced dental epithelium during tooth development?

    <p>Compression of the dental organ</p> Signup and view all the answers

    Which stage of tooth development is characterized by the deepening of the undersurface of the enamel organ and the beginning of cellular histodifferentiation?

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

    What type of cells are considered a functional unit with ameloblasts during tooth development?

    <p>Ameloblasts and SI</p> Signup and view all the answers

    What is the formula for hydroxyapatite, the mineral found in enamel?

    <p>Ca10(PO4)6(OH)2</p> Signup and view all the answers

    Which of the following stages of tooth development is characterized by the initiation of the lamina?

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

    During which stage of tooth development do ameloblasts secrete a unique extracellular matrix containing enamel proteins?

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

    What is the term for the process of enamel formation?

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

    Which of the following textbooks is recommended for studying oral development and histology?

    <p>Ten Cate’s oral histology. Development, structure, and function. Nanci A., 2017</p> Signup and view all the answers

    What is the composition of enamel during the maturation stage of amelogenesis?

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

    What is the term for the hardest tissue in the body?

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

    What is the term for the process whereby a tooth develops from a few cells in the primitive oral cavity to an erupted tooth with crown and root?

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

    What is the term for the morphological changes in the dental organ during tooth development?

    <p>Bud, cap, bell, and crown</p> Signup and view all the answers

    What is the role of enamel spindles during tooth development?

    <p>To signal differentiation of ameloblasts</p> Signup and view all the answers

    What are the principal stages of enamel development?

    <p>Initiation, in-growth, morphogenesis, differentiation</p> Signup and view all the answers

    During which stage of tooth development do ameloblasts secrete a unique extracellular matrix containing enamel proteins?

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

    What is the composition of enamel during the maturation stage?

    <p>66% mineral, 29% protein, 5% water</p> Signup and view all the answers

    Which type of cells signal to each other using secreted proteins as instructions for differentiation during tooth development?

    <p>Inner dental epithelium and ectomesenchyme cells</p> Signup and view all the answers

    What is the role of enamel spindles during tooth development?

    <p>To introduce differences in crystallite orientation and structure</p> Signup and view all the answers

    What is the function of the reduced dental epithelium during tooth development?

    <p>To form the enamel organ</p> Signup and view all the answers

    What is the term for the process whereby a tooth develops from a few cells in the primitive oral cavity to an erupted tooth with crown and root?

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

    What is the name of the process that creates structure in enamel and is responsible for the formation of enamel rods?

    <p>Tome's process</p> Signup and view all the answers

    Which stage of tooth development is characterized by the formation of the enamel organ?

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

    What can cause disturbances in enamel formation?

    <p>Ameloblast apoptosis</p> Signup and view all the answers

    Which stage of tooth development is characterized by the deepening of the undersurface of the enamel organ and the beginning of cellular histodifferentiation?

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

    During which stage of tooth development do ameloblasts secrete a unique extracellular matrix containing enamel proteins?

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

    What is the function of the reduced dental epithelium during tooth development?

    <p>To protect the enamel surface</p> Signup and view all the answers

    What is the composition of enamel during the maturation stage?

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

    What is the role of ameloblasts during enamel development?

    <p>To secrete enamel proteins</p> Signup and view all the answers

    What can cause disturbances in enamel formation?

    <p>All of the above</p> Signup and view all the answers

    What is the hardest tissue in the body?

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

    What is the term given to the end of the ameloblast cell which lays down the crystals of the enamel matrix?

    <p>Tombs' process</p> Signup and view all the answers

    What are the two main types of cells involved in enamel formation?

    <p>Ameloblasts and odontoblasts</p> Signup and view all the answers

    What is the formula for hydroxyapatite, the mineral found in enamel?

    <p>Ca10(PO4)6(OH)2</p> Signup and view all the answers

    What is the process called when a tooth develops from a few cells in the primitive oral cavity to an erupted tooth with crown and root?

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

    Study Notes

    Tooth Development

    • The process of tooth development from a few cells in the primitive oral cavity to an erupted tooth with crown and root is called morphodifferentiation.
    • The unique epithelial tissue that covers the crown of the tooth is called enamel organ.

    Enamel Formation

    • Enamel formation is also known as amelogenesis.
    • The two main types of cells involved in enamel formation are ameloblasts and ectomesenchyme cells.
    • Ameloblasts develop from the inner dental epithelium and require communication with ectomesenchyme cells to differentiate.
    • The principal stages of enamel development are:
      • Secretion stage: ameloblasts secrete a unique extracellular matrix containing enamel proteins.
      • Maturation stage: ameloblasts secrete a basal lamina on the enamel surface and attach to it.
    • Disturbances in enamel formation can be caused by genetic or environmental factors.
    • The composition of enamel during the secretion stage is a unique extracellular matrix containing enamel proteins.
    • The composition of enamel during the maturation stage is a highly mineralized, hard tissue.
    • Hydroxyapatite, the mineral found in enamel, has the formula Ca₅(PO₄)₃(OH).

    Ameloblasts

    • Ameloblasts are responsible for the formation of enamel rods during enamel development.
    • The function of ameloblasts during the secretory stage is to secrete a unique extracellular matrix containing enamel proteins.
    • The function of ameloblasts during the maturation stage is to secrete a basal lamina on the enamel surface and attach to it.
    • The term given to the end of the ameloblast cell which lays down the crystals of the enamel matrix is Tomes' process.

    Other

    • The hardest tissue in the body is enamel.
    • The role of enamel tufts is to anchor the enamel to the underlying dentin.
    • The role of enamel spindles is to provide a pathway for ions to move through the enamel.
    • The reduced dental epithelium plays a role in the formation of the enamel organ during tooth development.

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