Histology of dentin / Peritubular, Sclerotic and intertubular dentin

Peritubular dentin:

Highly mineralized collar of dentin matrix surrounding the dentinal tubules are called as peritubular dentin.

It is hypermineralized and contain little collagen with large amount of noncollagenous matrix proteins like DSP and DMP1.

Black respresents dentinal tubules and it is surrounded by Peritubular dentin

Sclerotic dentin:

Dentinal tubules which are occluded by calcified matrix are known as sclerotic dentin. 

It is a physiologic process which increase with age by inceased deposition of peritubular dentin. 

It prolongs the vitality of the pulp by preventing the carious lesions reaching to pulp.

Whistish area represents sclerotic dentin

Intertubular dentin:

Dentin which is present between the dentinal tubules are known as intertubular dentin. 

It has high amount of collagen type I having diameter around 50 to 200nm. 

iD= intertubular dentin

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