LINER
CaOH is used as liner when there is pulp exposure- like direct capping – or 0.5mm RDT
Liners should have final film thickness as 5microns.

VARNISH
○ Chemical insulation
○ Prevents microleakage
○ Prevents discolouration from amalgam
○ Most used in 1o tooth for amalgam
○ Contra-indicated in composite - inhibits polymerisation
○ Minimum no. of coats - 2
■ Walls of cavity
■ Floor of cavity
■ Over the amalgam for sensitivity microleakage
■ Over GIC for sensitivity also*