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What is Which one of the following dental cement accelerates the formation of reparative dentin? and explain in detail?
BIOLOGICAL PROPERTIES OF Ca(OH)2 :
Effect on pulp:
The cement is alkaline in nature. The high pH is due to the presence of free Ca(OH)2 in the set cement. The pH ranges from 9.2 to 11.7
Formation of secondary dentin: 
The high alkalinity and its consequent antibacterial and protein lysing effect helps in the formation of reparative dentin.
Ref: Mannapalli ed 3  pg 80