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Tooth Dentin Formation Quiz
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Tooth Dentin Formation Quiz

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Questions and Answers

What type of supply does dentine have?

  • Muscle supply
  • Nerve supply (correct)
  • Bone supply
  • Blood supply

    • Which cells are responsible for dentine formation during the embryonic stage?

  • Odontoblasts (correct)
  • Hepatoblasts
  • Chondroblasts
  • Osteoblasts

    • What is dentine capable of?

  • Digestion
  • Respiration
  • Reproduction
  • Repair (correct)

    • Which type of supply does dentine lack?

    <p>Blood supply</p> Signup and view all the answers

    What makes dentine sensitive?

    <p>Having only nerve supply</p> Signup and view all the answers

    What property of enamel allows it to resist elastic deformation?

    <p>High modulus of elasticity</p> Signup and view all the answers

    Which of the following characteristics does enamel possess?

    <p>Low modulus of elasticity</p> Signup and view all the answers

    What effect does a high modulus of elasticity have on enamel?

    <p>Decreases elastic deformation</p> Signup and view all the answers

    Which mechanical property is associated with enamel's resistance to elastic deformation?

    <p>High modulus of elasticity</p> Signup and view all the answers

    What would happen if enamel had a low modulus of elasticity?

    <p>Increased elastic deformation</p> Signup and view all the answers

    What is the term used to describe the areas between globules where the fusion may be incomplete?

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

    In which layer, beneath the mantle or root, can the fusion be incomplete resulting in interglobular dentin?

    <p>Granular layer</p> Signup and view all the answers

    What happens if the globules fail to calcify or the areas between them don’t calcify?

    <p>Formation of interglobular dentin</p> Signup and view all the answers

    What is a characteristic feature of areas with interglobular dentin?

    <p>Incomplete calcification</p> Signup and view all the answers

    Which specific layers are mentioned in the text as areas where fusion may be incomplete?

    <p>Beneath the mantle and granular layers</p> Signup and view all the answers

    What forms a neuro vascular bundle in teeth?

    <p>Arterioles and venules</p> Signup and view all the answers

    Where does the neuro vascular bundle enter the tooth from?

    <p>Apical foramen and lateral canals</p> Signup and view all the answers

    Where do the blood vessels branch profusely to form a plexus?

    <p>Coronal part</p> Signup and view all the answers

    Which vessels are NOT involved in forming the neuro vascular bundle?

    <p>Lymphatic vessels</p> Signup and view all the answers

    What happens to the neuro vascular bundle as it reaches the crown of the tooth?

    <p>It branches profusely</p> Signup and view all the answers

    What is the major GAG that helps facilitate cell migration in developing pulp?

    <p>Chondroitin sulphate</p> Signup and view all the answers

    Which type of GAG plays a crucial role in cell migration during development?

    <p>Chondroitin sulfate</p> Signup and view all the answers

    Which glycosaminoglycan (GAG) is primarily involved in aiding cell migration in developing pulp?

    <p>Chondroitin sulphate</p> Signup and view all the answers

    Which GAG is specifically emphasized for its role in cell migration in developing tissues?

    <p>Chondroitin sulphate</p> Signup and view all the answers

    What is the predominant glycosaminoglycan (GAG) that aids cell migration during development in pulp?

    <p>Chondroitin sulphate</p> Signup and view all the answers

    What type of sequence is found in osteopontin that is important for receptor binding?

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

    Which component of osteopontin is phosphorylated?

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

    Where has osteopontin been identified?

    <p>In interglobular dentin</p> Signup and view all the answers

    Which of the following correctly describes the structure of osteopontin?

    <p>Phosphorylated glycoprotein</p> Signup and view all the answers

    What function does the receptor binding sequence RGD serve in osteopontin?

    <p>Receptor binding</p> Signup and view all the answers

    What is the typical width of the mineralization front in dentinogenesis?

    <p>20-50um</p> Signup and view all the answers

    How would you describe the staining appearance of demineralized H&E sections?

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

    Which appearance might the mineralization front show during dentinogenesis?

    <p>Globular or linear</p> Signup and view all the answers

    What aspect of enamel is highlighted by its lack of mineralization in demineralized H&E sections?

    <p>Unmineralized areas are more resistant</p> Signup and view all the answers

    In what range is the width of the mineralization front during dentinogenesis?

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

    What factor causes variation in width between teeth and within an individual tooth?

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

    Which factor contributes to the variations in dentin width within an individual tooth?

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

    What aspect of a tooth influences the width of dentin?

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

    In addition to location, what else can cause variation in the width of dentin?

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

    Which parameter influences the width variations of dentin?

    <p>0.25mm width</p> Signup and view all the answers

    What percentage of the dry weight does collagen comprise as the predominant extracellular matrix component?

    <p>25-32%</p> Signup and view all the answers

    What is the primary component of the extracellular matrix, responsible for 25–32% of the dry weight?

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

    Which component makes up a significant portion of the dry weight and is considered the main constituent of the extracellular matrix?

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

    In the extracellular matrix, what proportion of the dry weight does collagen predominantly account for?

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

    What is the major component of the dry weight in the extracellular matrix?

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

    What is the defining characteristic of acellular cementum?

    <p>It has a dark line marking afibrillar cementum</p> Signup and view all the answers

    In acellular cementum, what separates the hyaline layer from the acellular cementum?

    <p>Dark line signifying afibrillar cementum</p> Signup and view all the answers

    What type of cementum is found to be structureless without any cells present?

    <p>Acellular cementum</p> Signup and view all the answers

    Which layer in the tooth consists of acellular cementum with a dark line marking afibrillar cementum?

    <p>Hyaline layer</p> Signup and view all the answers

    What distinguishes the appearance of acellular cementum from cellular cementum?

    <p>Dark line indicating afibrillar cementum</p> Signup and view all the answers

    What is the typical shape of most crystallites in dentin cross sections?

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

    Which part of the crystals in dentin is richer in magnesium and carbonate?

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

    What characteristic of the dentin peripheries makes them less soluble when compared to the cores?

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

    What mineral ions are more prominent in the cores of dental crystals?

    <p>Magnesium and carbonate</p> Signup and view all the answers

    What is the primary factor influencing the solubility differences between the cores and peripheries of dentin crystals?

    <p>Magnesium concentration</p> Signup and view all the answers

    Why do odontoblasts appear like multilayered columnar cells in histological sections?

    <p>As a result of their pseudostratified columnar structure</p> Signup and view all the answers

    What is the main reason for odontoblasts being described as pseudostratified columnar cells?

    <p>Appearance of multiple cell nuclei at different levels within the cells</p> Signup and view all the answers

    In histological sections, what gives odontoblasts the appearance of being multilayered columnar cells?

    <p>The perpendicular arrangement of the Golgi apparatus</p> Signup and view all the answers

    What cellular feature contributes most to odontoblasts resembling multilayered columnar cells?

    <p>The presence of microvilli on the cell surface</p> Signup and view all the answers

    What characteristic feature primarily leads to odontoblasts being perceived as multilayered columnar cells?

    <p>The elongated and aligned cell bodies within the tissue</p> Signup and view all the answers

    What is a defining characteristic of true denticles according to the text?

    <p>They bear a resemblance to dentine (tubular)</p> Signup and view all the answers

    How are pulp stones typically detected on radiographs?

    <p>By their distinct borders</p> Signup and view all the answers

    In the context of pulp stones, what sets true denticles apart from other structures?

    <p>Their tubular resemblance to dentine</p> Signup and view all the answers

    What distinguishes a group of pulp stones from a single pulp stone according to the text?

    <p>The presence of globular calcifications</p> Signup and view all the answers

    Which statement accurately describes the appearance of true denticles on radiographs?

    <p>They show a tubular radiodensity similar to dentine</p> Signup and view all the answers

    Why does oblique sectioning result in multiple cell layers appearing above each other?

    <p>The thickness of one cell makes it impossible to cut the section.</p> Signup and view all the answers

    Which factor primarily influences the width of dentin within an individual tooth?

    <p>Variations in dentin width caused by factors like incomplete calcification.</p> Signup and view all the answers

    What leads to the sensitivity of dentin?

    <p>Lack of mineralization in specific sections.</p> Signup and view all the answers

    What distinguishes acellular cementum from cellular cementum?

    <p>The presence of a dark line marking afibrillar cementum.</p> Signup and view all the answers

    Which aspect of dentine formation during the embryonic stage is highlighted?

    <p>Significance of glycosaminoglycans (GAGs) in aiding cell migration.</p> Signup and view all the answers

    What receptors do both cementoblasts and osteoblasts have for parathormone (PRT) and parathormone receptor protein (PTHrP)?

    <p>Parathyroid hormone receptors</p> Signup and view all the answers

    What gland controls the activity of cementoblasts and osteoblasts through the action of parathormone (PRT) and parathormone receptor protein (PTHrP)?

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

    What does the distribution of a vertical force on a tooth surface aim to achieve?

    <p>Reduce the amount of mechanical force on the tooth</p> Signup and view all the answers

    What is the primary function of applying a vertical force on a tooth surface?

    <p>To facilitate proper distribution of forces on the tooth</p> Signup and view all the answers

    How can one ensure the long-term functionality of teeth following the application of vertical forces?

    <p>By taking good care of them with regular oral hygiene practices</p> Signup and view all the answers

    Study Notes

    Collagen and Cementum

    • Collagen is the main component of the extracellular matrix, making up 25-32% of the dry weight.
    • Acellular cementum appears structureless, with no cells.
    • There is a dark line between the hyaline layer and acellular cementum, marking the afibrillar cementum.

    Dentin Formation

    • Odontoblasts are responsible for dentin formation during the embryonic stage.
    • Incomplete fusion of globules can lead to areas of interglobular dentin, which are areas between globules.

    Blood Vessels and Pulp

    • Blood vessels (arterioles and venules) have a close relation with nerves, forming a neurovascular bundle that enters the tooth from the apical foramen and lateral canals.
    • Chondroitin sulphate is the major glycosaminoglycan (GAG) in the developing pulp, facilitating cell migration.
    • Osteopontin, a phosphorylated glycoprotein, is identified in predentine and contains the receptor binding sequence RGD.

    Dentin Characteristics

    • Dentin width is around 0.25mm, varying according to location, function, and age.
    • Dentin has a distinct pale-staining appearance in demineralized H&E sections due to its lack of mineralization.
    • Mineralization front can show a globular or linear appearance (dentinogenesis).
    • Dentin crystallites are mostly hexagonal in cross-section, with cores richer in magnesium and carbonate.

    Odontoblasts and Pulp Stones

    • Odontoblasts appear as multilayered columnar cells (pseudostratified columnar cells) in histological sections.
    • Pulp stones can be single or in groups, and can be detected on radiographs.
    • True denticles resemble dentine, with a tubular structure.

    Hormonal Control

    • Cementoblasts and osteoblasts have receptors for parathormone (PRT) and parathormone receptor protein (PTHrP), making them under the control of thyroid and parathyroid glands.

    Tooth Structure and Function

    • The tooth structure is designed to distribute mechanical force in different directions, reducing the amount of force on the tooth and allowing it to function for a long period.

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    Description

    Test your knowledge about dentin formation in teeth, including the role of odontoblasts and the repair process. Explore the characteristics of dentin that make it vital, sensitive, and capable of repair.

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