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 de...
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) l...
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
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
dentin pattern of mineralization, 1ry 2nd 3ry dentin formation and root dentin
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

  1. 1. Dentin pattern of mineralization Root dentin formation Physiologic 1ry ,2ry and 3ry dentin Ahmed Emam
  2. 2. Dentinogenesis acellular zone separates ameloblasts from dental papilla
  3. 3. Dentinogenesis - Secretory Stage
  4. 4. Odontoblasts and process Dentin Odontoblast process Pulp Odontoblast cells
  5. 5. Note: collagen fibers & odontoblastic processes in tubules
  6. 6. Dentinogenesis First sign of dentin formation.
  7. 7. ` arrows show von Korff’s fibers
  8. 8. Odontoblasts produce organic matrix & crystals. Note: mineralization foci forming mantle dentin
  9. 9. MANTLE DENTIN CIRCUMPULPAL DENTIN Maturation of dentin
  10. 10. Begin of Crystallization Matrix vesicle Crystal lodgment Rupture of the MV and begin of mineralization Maturation of dentin
  11. 11. Types of dentin: globular/interglobular
  12. 12. Inter-globular dentin
  13. 13. Interglobuler dentin
  14. 14. Interglobular Dentin Dentino Enamel Junction Dentinal Tubules Interglobuler dentin
  15. 15. Odontoblast processes
  16. 16. Hard Tissue Formation Bell Stage
  17. 17. Formation of Hertwig’s epithelial root sheath.
  18. 18. Sheath grows around dental papilla/future pulp.
  19. 19. The Completed Root Incremental layering of cementum. Alveolar bone Pulp
  20. 20. Dentin Cementum Granular layer of Tom Hyaline layer
  21. 21. • 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.
  22. 22. DENTIN CLASSIFICATION Types of dentin:
  23. 23. Primary physiological dentin Secondary physiological dentin
  24. 24. Secondary physiological dentin Tertiary dentin Primary physiological dentin
  25. 25. Dead tracts Tertiary dentin Secondary physiological dentin Primary physiological dentin
  26. 26. THE END Thank you
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