Sunday, March 11, 2018

Types of Dentin

Hey friends,

Dentin is a very important question.

It comes as a question worth 4 points in my theory exam paper! I have tried my best to make it simpler for you all in this blog :))

I hope this will help you!

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Primary Dentin

It is divided into Mantle and Circumpulpal Dentin 

A. Mantle Dentin 
  • First formed dentin in the Crown
  • Type III collagen
  • It is less mineralized
  • Matrix vesicles are present which help in Globular calcification
B. Circumpulpal Dentin
  • It forms the bulk of the tooth
  • Type one collagen
  • It is more mineralized
  • Matrix vesicles are present which help in Linear and globular calcification

Secondary Dentin

  • It is formed after the root completion
  • It contains dentinal tubules which are S-shaped
  • The mineral ratio is similar to primary Dentin 
  • Secondary Dentin is a narrow band of Dentin bordering the pulp
  • As age increases, inorganic content increases
  • Therefore the Dentin becomes sclerosed
  • It means It protects the pulp from exposure in older teeth

Tertiary Dentin 

It is formed in response to stimuli
Cavity preparation
  • It is deposited on the pulpal surface of Dentin only in the affected area
  • The appearance of Dentin varies as it is formed by an odontoblast 
  • Quality and quantity of tertiary Dentin depends on intensity and duration of stimuli
Reactionary Dentin 
Dentin is deposited by pre-existing odontoblasts
Reparative Dentin 
Dentin is deposited by newly differentiated odontoblast-like cells

Written by Anisha Valli :))))


  1. You tried to make it simpler but missed out some important points. But still the 1st dentistry post, Voila!
    Primary dentin is of 2 types : Mantle and Circumpulpal.
    Mantle means anything that covers. Hence it is the zone below the DE junction i.e. it is the outermost part of the part of primary dentin about 20 micro metre in diameter. Fibrils of this zone are perpendicular to DEJ.
    The collagen fibers present are agyrophilic and are known as von Korff's fibers.
    The Normal Dentin consists of 35% organic and water & 65% inorganic matter. You should have mentioned this when you're saying that the mineral ratio of primary and secondary dentin is similar.
    I would love to see more posts on histo and oral and maxillofacial pathology.

  2. Thank you for adding these points Ajinkya Pandit.


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