Enamel Development Incremental Lines Quiz
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Questions and Answers

What is the term for the fine grooves running circumferentially around the crown of the tooth's surface enamel?

  • Perikymata grooves (correct)
  • Focal holes
  • Enamel caps
  • Neonatal line
  • Which area of the enamel is characterized by small elevations resulting from enamel deposition on top of debris late during tooth development?

  • Enamel spindles
  • Enamel tufts
  • Enamel lamellae
  • Enamel caps (correct)
  • What causes a particularly marked stria in the enamel that reflects the metabolic changes at birth?

  • Incremental lines
  • Neonatal line (correct)
  • Enamel spindles
  • Enamel tufts
  • Which feature on the enamel surface marks the ends of ameloblasts and is approximately 1-1.5µm in depth?

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

    What is the term for depressions on the surface of enamel resulting from the loss of enamel caps with underlying material?

    <p>Focal holes</p> Signup and view all the answers

    Which part of the enamel is richer in trace elements, especially fluorine, and has less carbonate content?

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

    What is the approximate distance between enamel striae in the middle portion?

    <p>25-35μm</p> Signup and view all the answers

    What is the approximate distance between cross striations near the enamel-dentine junction?

    <p>2μm</p> Signup and view all the answers

    What do incremental lines represent in enamel formation?

    <p>Periods of inactivity alternating with periods of activity</p> Signup and view all the answers

    What is the direction of enamel striae in cross sections?

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

    What is the possible cause of differential light-scattering effects at the enamel striae?

    <p>Slight change in prism direction/thickness, or slight differences in crystallite composition/orientation, and/or differences in organic content</p> Signup and view all the answers

    What do cross striations reflect in enamel formation?

    <p>Daily rhythm</p> Signup and view all the answers

    What is the unique feature of the Enamel-Dentine Junction that retards crack propagation?

    <p>It has a scalloped pattern beneath cusps and incisal edges</p> Signup and view all the answers

    What is the function of Enamel Tufts in the inner third of the enamel?

    <p>They are thought to be residual matrix protein at the prism boundaries</p> Signup and view all the answers

    What are Enamel Lamellae and what is their characteristic feature?

    <p>They are hypomineralised areas that run the entire enamel thickness</p> Signup and view all the answers

    What is the direction of Enamel Spindles in relation to the prisms?

    <p>They are not aligned with the prisms</p> Signup and view all the answers

    What are Incremental Lines, Cross and Stria in the context of enamel?

    <p>They are features of the Enamel that occur from DEJ to surface</p> Signup and view all the answers

    What is the mineral content of the Enamel-Dentine Junction compared to Enamel and Dentine?

    <p>It is less mineralised than both Enamel and Dentine</p> Signup and view all the answers

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