California Registered Dental Assistant (RDA) Written Practice Exam

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Which supplemental material is contraindicated under composite resin and glass ionomer restorations?

Calcium Hydroxide
Glass Ionomer
Varnish
Composite Resin

The correct answer is: Varnish

Varnish is the only material that is contraindicated under composite resin and glass ionomer restorations. This is because varnish contains solvents that act as a barrier and may prevent proper bonding of the composite resin and glass ionomer materials. Calcium hydroxide and glass ionomer are actually both commonly used as liners under composite resin and glass ionomer restorations and are not contraindicated. Composite resin is also a material used in these restorations, so it is not the correct answer.