dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
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dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin

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dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin Presentation Transcript

  • Dentin pattern of mineralization Root dentin formation Physiologic 1ry ,2ry and 3ry dentin Ahmed Emam
  • Dentinogenesis acellular zone separates ameloblasts from dental papilla
  • Dentinogenesis - Secretory Stage
  • Odontoblasts and process Dentin Odontoblast process Pulp Odontoblast cells
  • Note: collagen fibers & odontoblastic processes in tubules
  • Dentinogenesis First sign of dentin formation.
  • ` arrows show von Korff’s fibers
  • Odontoblasts produce organic matrix & crystals. Note: mineralization foci forming mantle dentin
  • MANTLE DENTIN CIRCUMPULPAL DENTIN Maturation of dentin
  • Begin of Crystallization Matrix vesicle Crystal lodgment Rupture of the MV and begin of mineralization Maturation of dentin
  • Types of dentin: globular/interglobular
  • Inter-globular dentin
  • Interglobuler dentin
  • Interglobular Dentin Dentino Enamel Junction Dentinal Tubules Interglobuler dentin
  • Odontoblast processes
  • Hard Tissue Formation Bell Stage
  • Formation of Hertwig’s epithelial root sheath.
  • Sheath grows around dental papilla/future pulp.
  • The Completed Root Incremental layering of cementum. Alveolar bone Pulp
  • Dentin Cementum Granular layer of Tom Hyaline layer
  • • The lamellar appearance of the cellular cementum is apparent, as are the cemento cytes. A hyaline layer (green arrow) lies between the cementum and dentin, and contains proteins secreted by the root sheath that are related to the enamelins produced by the ameloblasts. In addition, the collagen fibers of primary acellular cementum are oriented perpendicularly to the fibers of the dentin into which they insert. This provides for the very strong bonding of cementum to dentin, and thus aids in the attachment of the tooth to alveolar bone via the periodontal ligament fibers. The tubular structure of dentin is clearly visible, and the granular layer of Tomes (black arrow) can be seen subjacent to the cementum • This micrograph also demonstrates the highly branched structure of the odontoblastic processes in root dentin, which is thought to be responsible for the granular layer of Tomes. The arrow and bracket indicate the region of the hyaline layer.
  • DENTIN CLASSIFICATION Types of dentin:
  • Primary physiological dentin Secondary physiological dentin
  • Secondary physiological dentin Tertiary dentin Primary physiological dentin
  • Dead tracts Tertiary dentin Secondary physiological dentin Primary physiological dentin
  • THE END Thank you