Seondary dentin formation starts after the completion of root formation.
=> It is formed by the same odontoblast which forms the primary dentin. But the rate of secondary dentin formation is slower than that of primary dentin.
=> Secondary dentin differs slightly from primary dentin in staining and organization of dentinal tubules or somtimes dentinal tubules are absent.
Tertiary dentin is deposited at specific sites like damage to odontoblast or carious lesion or a site of restorative dental procedure.
=> Rate of tertiary dentin deposition is rapid and it may results in entrapment of cells.
=> During formation of tertiary dentin collagen, DSP and DMP1 are down regulated and BSP, osteopontin are up regulated.
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