A 30 year old male presents to OPD with sensitivity to cold water. On intraoral examination, 36 is carious. When both a cavity varnish and a polycarboxylate cement base are being used in conjunction with a dental amalgam restoration, then the cavity varnish should be:
When a cavity varnish or dentin bonding agent is indicated to seal a restoration, the base often governs the order of material application. If a zinc phosphate cement base is used, a sealing (Varnish) material should be applied to the cavity walls before placement of the base. For the more biocompatible cement base materials (e.g., calcium hydroxide, ZOE, polycarboxylate, and GIC), the base cement is placed, followed by the cavity varnish after the base has hardened.
Applied to the pulpal wall only
Kept well away from the enamel margins
Applied to the cavity preparation after placing the base
Applied to the cavity preparation before placing the base