EFDA Bases, Liners, and Sealants 5

Question 1

Which of the following clinical scenarios is MOST appropriate for sealant placement?

Accepted Answer

A 7-year-old with newly erupted first molars showing deep fissures

Answer

Newly erupted molars in children with deep, caries-susceptible fissures represent the ideal candidate for preventive sealant application.

Question 2

What is the primary reason eugenol-containing temporary cements cannot be used under composite resin restorations?

Accepted Answer

Eugenol weakens the composite resin by inhibiting polymerization

Answer

Eugenol is a plasticizer that inhibits the free-radical polymerization of resin composites, leading to incomplete curing and restoration failure.

Question 3

When placing a sealant on a partially erupted molar where the distal portion is still under the operculum, the EFDA should:

Accepted Answer

Defer sealant placement until full eruption to ensure isolation

Answer

Adequate moisture control is impossible under an operculum, so sealant placement should be deferred until the tooth is fully erupted and isolation can be achieved.

Question 4

A varnish-type liner such as copal varnish is primarily used under amalgam restorations to:

Accepted Answer

Seal dentinal tubules and reduce microleakage initially

Answer

Copal varnish seals dentinal tubules to reduce early microleakage and fluid sensitivity, though it dissipates as the amalgam margins tighten over time.

Question 5

Which of the following correctly describes the 'sandwich technique' in restorative dentistry?

Accepted Answer

Using a glass ionomer base beneath composite resin to combine fluoride release with esthetic overlay

Answer

The sandwich technique places a glass ionomer base (for fluoride and adhesion) beneath composite resin (for esthetics and strength) in a single restoration.

(EFDA) Expanded Function Dental Auxiliary Practice Test

(EFDA) Expanded Function Dental Auxiliary Practice Test

EFDA Bases, Liners, and Sealants 5