It is a type of dental restoration required where there is an inadequate amount of sound tooth remaining after root canal treatment.
It is done so that to achieve strength and built a structure on grossly damaged tooth so that it can support a crown and give life to tooth.
A Post is cemented into prepared root canal, which retains a core restoration, which further retains a crown.
A Post also helps in redistributing the stresses onto the root thereby reducing the risk of coronal facture.