Histology of Dentin

2. ©Copyright 2007, Thomas G. Hollinger, Gainesville, Fl By Hesham Dameer

5. Primary dentin the most prominent dentin in the tooth, lies between the enamel and the pulp chamber. Secondary dentin is formed after root formation is complete, normally after the tooth has erupted and is functional. It grows much slower than primary dentin.The growth of this type of dentin causes the decrease in the size of the pulp chamber with age; this is why cavity preparation in young patients is risky which may lead to exposing the pulp.

7. Tertiary dentin

9. peritubular / intratubular dentine dentin that forms the wall of each tubule more mineral than intertubular dentin intertubular dentine dentine between the tubules

10. Interglobular Dentin Inter- globuler dentin Dentinal Tubules Dentino Enamel Junction

11. Dentin Cementum Granular layer of Tomes

14. Odontoblast processes

15. Odontoblasts and process Odontoblast cells Odontoblast process Dentin Pulp

16. Dentinal Matrix Dentinal matrix Hole for dentinal tubules

18. Dentinal tubules

19. Dentinal tubules Peritubular dentin Intertubular dentin

20. Dentinal Tubules Coronal dentin Root dentin

21. Hydrodynamic theory : Fluid movements in the dentinal tubules – the tubular nature of dentin permits fluid movement to occur within the tubule when a stimulus is applied – a movement registered by pulpal free nerve endings close to the dentin. Brannstrom’s Theory.

22. THE END Thank you