None of the Following Tissues Have the Ability to Regenerate

Question

None of the following tissues have the ability to regenerate EXCEPT one.Which one is the EXCEPTION?
A) Enamel
B) Dentin
C) Pulp
D) Periodontal ligament

Accepted Answer

Dentin has the unique ability to regenerate,or stated differently,to add to itself.The resultant material,called secondary dentin,is formed throughout the pulp chamber after tooth eruption.Over time,secondary dentin can completely fill the pulp chamber and become problematic.A specific type of secondary dentin called reparative dentin is laid down in response to dental caries or trauma.Please note that while not a selection in this question,cellular cementum,which is confined to the apical third of the root,can reproduce to compensate for attrition of more coronal aspects of a tooth.