1.      Acts as barrier against the movements of the irritant substances inside the dentinal tubuly, as the produced by acids and polymers.

2.      Temporary barrier to reduce the loss of humidity inside the obturations

3.      Protects the cavity liners (calcium hidroxide cements) from etching.

4.      Helps to get an optimal marginal seal in amalgam obturations.

5.      Temporary protection for sensitive dentin and exposed cement.