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Dentin Composition and Properties: Crown and Root Regions
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Dentin Composition and Properties: Crown and Root Regions

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Questions and Answers

What is the main property that differentiates mantle dentin from circumpulpal dentin?

  • Horizontal arrangement of collagen fibrils (correct)
  • Branching of tubules
  • Thicker mineral crystals
  • Lower mineral content

    • Which region of dentin is characterized by a layer between globules?

  • Mantle dentin
  • Interglobular dentin (correct)
  • Hyaline layer
  • Predentine

    • In which region do we observe a decrease in both hardness and elastic modulus towards the DEJ?

  • Mantle Dentine (correct)
  • Predentine
  • Circumpulpal dentine
  • Interglobular dentine

    • What is the width range of the mantle dentin layer?

    <p>20-150 micrometers</p> Signup and view all the answers

    Which region has a different mineralization process called dentinogenesis compared to other regions?

    <p>Circumpulpal dentine</p> Signup and view all the answers

    What characteristic gives the mantle region an appearance distinct from circumpulpal dentine in polarizing light microscopy?

    <p>Perpendicular collagen fibrils on DEJ</p> Signup and view all the answers

    What causes dentine to look black in ground sections?

    <p>The presence of more tubular branches</p> Signup and view all the answers

    Which part of the tooth has a distinct pale-staining appearance in demineralized sections?

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

    What forms the bulk of the dentine?

    <p>Circumpulpal dentine</p> Signup and view all the answers

    What is the width range of structural lines in dentine?

    <p>10-40um</p> Signup and view all the answers

    Which type of lines are associated with the primary curvatures of dentinal tubules?

    <p>Incremental lines</p> Signup and view all the answers

    Why are loops more profused in root dentine compared to crown?

    <p>Root dentine has more tubular branches</p> Signup and view all the answers

    What is the name of the areas found under the mantle dentin where fusion of calcospheres may be incomplete?

    <p>Interglobular dentin</p> Signup and view all the answers

    Which type of dentin appears dark in ground sections viewed under transmitted light due to undercalcified interglobular areas?

    <p>Interglobular dentin</p> Signup and view all the answers

    What is the function of the hyaline layer in the root?

    <p>Aids in bonding dentin to cementum</p> Signup and view all the answers

    What is a distinguishing feature of the granular layer of Tome compared to interglobular dentin?

    <p>Structureless appearance</p> Signup and view all the answers

    Which type of dentin is characterized by tubules passing through without deviation and peritubular dentin being absent?

    <p>Interglobular dentin</p> Signup and view all the answers

    Where is the hyaline layer located in relation to the cementum and the dentin?

    <p>Between the mantle dentin and granular layer</p> Signup and view all the answers

    What are the short-term striations in dentin called?

    <p>Von Ebner's lines</p> Signup and view all the answers

    How often are Andresen lines formed in dentin?

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

    What is the approximate distance between two Andresen lines?

    <p>16-20um</p> Signup and view all the answers

    What causes fluctuations in the mineral content of dentin?

    <p>Fluctuations in acid-base balance</p> Signup and view all the answers

    What makes Von Ebner's lines more marked under polarised light?

    <p>Change in collagen fibrils orientation</p> Signup and view all the answers

    What are the exaggerated Andersen lines caused by?

    <p>Differences in mineralization</p> Signup and view all the answers

    What is the cause of contour lines of Owen in dentine?

    <p>Hypomineralization of Andersen lines</p> Signup and view all the answers

    What type of dentine forms once the root is completed and the tooth comes into occlusion?

    <p>Secondary dentine</p> Signup and view all the answers

    Which type of dentine is associated with dentinal responses to stimuli (pathological)?

    <p>Tertiary dentine</p> Signup and view all the answers

    What is the location of the neonatal line in deciduous teeth?

    <p>Close to the enamel-dentine junction</p> Signup and view all the answers

    What is the characteristic of secondary dentine compared to primary dentine?

    <p>Slower deposition</p> Signup and view all the answers

    What is the cause of interruption and shortening of secondary curvatures of tubules in dentine?

    <p>Coincidence of secondary curvatures of tubules</p> Signup and view all the answers

    What is the main characteristic that differentiates mantle dentin from circumpulpal dentin?

    <p>Collagen fibrils perpendicular on DEJ</p> Signup and view all the answers

    What is the primary property of interglobular dentin that distinguishes it from other dentin regions?

    <p>Presence of calcospheres</p> Signup and view all the answers

    In which region of the tooth do we observe a decrease in both hardness and elastic modulus towards the DEJ?

    <p>Mantle dentin</p> Signup and view all the answers

    What differentiates mantle dentin from the bulk of dentin underneath it in terms of mineralization process?

    <p>Different branching of tubules</p> Signup and view all the answers

    Which region in the root of a tooth is characterized by a granular layer of Tomes?

    <p>Circumpulpal dentine</p> Signup and view all the answers

    What distinguishes interglobular dentine from other regions in terms of its composition?

    <p>Areas between globules</p> Signup and view all the answers

    What is the term used to describe the continuous whole thickness of dentine?

    <p>Primary dentine</p> Signup and view all the answers

    What causes the interrupted and shortened secondary curvatures of tubules in dentine?

    <p>Coincidence of secondary curvatures</p> Signup and view all the answers

    What is the term for the dentine formed partly before and partly after birth, close to the DEJ and usually seen with enamel neonatal line in close proximity?

    <p>Secondary dentine</p> Signup and view all the answers

    What do Andersen lines and contour lines of Owen indicate in dentine?

    <p>Change in mineralization</p> Signup and view all the answers

    Which type of dentine is very similar to primary dentine, starts to form once the root is completed, and still forms in unerupted, impacted teeth?

    <p>Secondary dentine</p> Signup and view all the answers

    What are the physiological age changes associated with dentin?

    <p>Secondary Dentin.</p> Signup and view all the answers

    What happens in the B image in response to a strong stimulus?

    <p>Death of odontoblasts</p> Signup and view all the answers

    In which type of dentine do stimuli like slow caries and attrition induce the deposition of material inside the tubules?

    <p>Sclerotic dentine</p> Signup and view all the answers

    What is the result of primary odontoblasts being killed before the formation of intratubular dentine?

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

    What distinguishes sclerotic dentine from translucent dentine?

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

    What is the characteristic appearance of D image at high magnification?

    <p>Collagen absence, mineralized matrix present</p> Signup and view all the answers

    What role do primary odontoblasts play in the formation of Sclerotic Dentine?

    <p>Retreat before intratubular dentine formation</p> Signup and view all the answers

    Which type of dentin is characterized by tubules passing through without deviation and peritubular dentin being absent?

    <p>Mantle dentin</p> Signup and view all the answers

    Which type of dentine forms once the root is completed and the tooth comes into occlusion?

    <p>Secondary dentin</p> Signup and view all the answers

    Which part of the tooth has a distinct pale-staining appearance in demineralized sections?

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

    What forms the bulk of the dentine?

    <p>Circumpulpal dentin</p> Signup and view all the answers

    Which type of dentin is associated with dentinal responses to stimuli (pathological)?

    <p>Tertiary dentin</p> Signup and view all the answers

    Which type of lines are associated with the secondary curvatures of dentinal tubules?

    <p>Contour lines of Owen</p> Signup and view all the answers

    What is the cause of interglobular dentin in the crown and root?

    <p>Incomplete fusion of calcospheres</p> Signup and view all the answers

    What is the appearance of interglobular dentin in ground sections viewed under transmitted light?

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

    What is the function of the hyaline layer in the root?

    <p>Helps in bonding cementum to dentin</p> Signup and view all the answers

    What is the characteristic of secondary dentine compared to primary dentine?

    <p>Has less tubules</p> Signup and view all the answers

    What is the cause of contour lines of Owen in dentine?

    <p>Changes in the direction of dentinal tubules</p> Signup and view all the answers

    Which type of dentine is characterized by tubules passing through without deviation and peritubular dentin being absent?

    <p>Interglobular dentin</p> Signup and view all the answers

    What do undercalcified interglobular areas in dentin appear as when viewed under transmitted light?

    <p>Dark areas</p> Signup and view all the answers

    What is the function of the hyaline layer in dentin?

    <p>Assist in bonding dentine to cementum</p> Signup and view all the answers

    What distinguishes the granular layer of Tome from interglobular dentin?

    <p>It is atubular and structureless</p> Signup and view all the answers

    Which region of the tooth has a narrow clear area between the cementum and the dentin, 20 micrometers in width, known as the hyaline layer?

    <p>Root dentin</p> Signup and view all the answers

    What is the characteristic appearance of interglobular dentin under transmitted light due to undercalcified areas?

    <p>Dark appearance</p> Signup and view all the answers

    What mineralization process differentiates the hyaline layer from other regions of dentin?

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

    What is the main reason why root dentine appears darker than crown dentine in ground sections?

    <p>Incomplete fusion of calcospherites</p> Signup and view all the answers

    What distinguishes predentine from circumpulpal dentin in terms of appearance under H&E sections?

    <p>Distinct pale-staining appearance</p> Signup and view all the answers

    Which structural lines in dentine are associated with the primary curvatures of dentinal tubules?

    <p>Lines associated with the primary curvatures</p> Signup and view all the answers

    What is a distinguishing characteristic of mantle dentin compared to circumpulpal dentin?

    <p>More profused tubular branches</p> Signup and view all the answers

    Which type of dentine is hypomineralized compared to circumpulpal dentin?

    <p>Interglobular dentin</p> Signup and view all the answers

    What characteristic defines the internal reflection of transmitted light in ground sections of dentine?

    <p>Air spaces created by branching tubules</p> Signup and view all the answers

    What do Schreger lines represent in dentinal tubules?

    <p>Convexities of the S-shaped tubules</p> Signup and view all the answers

    Where are Schreger lines primarily visible?

    <p>Longitudinal sections</p> Signup and view all the answers

    What is the main cause of Contour lines of Owen in dentine?

    <p>Small secondary curvatures inside primary curvature</p> Signup and view all the answers

    What is the distinguishing feature of Neonatal line in dentin?

    <p>Composition change before and after birth</p> Signup and view all the answers

    What makes the granular layer of Tomes unique compared to other dentin formations?

    <p>Interrupted secondary curvatures</p> Signup and view all the answers

    Where is the Neonatal line typically located in relation to the Dentinoenamel Junction (DEJ) and enamel?

    <p>Between DEJ and enamel</p> Signup and view all the answers

    What is the main function of the perpendicular collagen fibrils in mantle dentin near the DEJ?

    <p>To prevent small cracks from spreading into the dentin.</p> Signup and view all the answers

    Which type of dentine is characterized by tubules passing through without deviation and peritubular dentin being absent?

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

    What is the width range of structural lines in dentine?

    <p>2-5 micrometers</p> Signup and view all the answers

    What distinguishes interglobular dentine from other regions in terms of its composition?

    <p>Lower mineral content</p> Signup and view all the answers

    What is the primary property of interglobular dentin that distinguishes it from other dentin regions?

    <p>Lower mineral content</p> Signup and view all the answers

    What is the main characteristic that differentiates sclerotic dentine from translucent dentine?

    <p>Higher mineral content</p> Signup and view all the answers

    What is the primary cause of fluctuations in the mineral content of dentin?

    <p>Changes in the acid-base balance</p> Signup and view all the answers

    Which type of dentine is characterized by tubules passing through without deviation and peritubular dentin being absent?

    <p>Sclerotic dentin</p> Signup and view all the answers

    What causes interglobular dentin in the crown and root?

    <p>Incomplete fusion of calcospheres</p> Signup and view all the answers

    What are the exaggerated Andersen lines caused by?

    <p>Differences in mineralization</p> Signup and view all the answers

    What type of dentine forms once the root is completed and the tooth comes into occlusion?

    <p>Secondary dentine</p> Signup and view all the answers

    What causes dentine to look black in ground sections?

    <p>Undercalcification of interglobular areas</p> Signup and view all the answers

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