Bases, Liners, and Sealants Flashcards
7 cards from real EFDA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Bases, Liners, and Sealants flashcards as text
Which of the following clinical scenarios is MOST appropriate for sealant placement?
Answer: A 7-year-old with newly erupted first molars showing deep fissures
Newly erupted molars in children with deep, caries-susceptible fissures represent the ideal candidate for preventive sealant application.
What is the primary reason eugenol-containing temporary cements cannot be used under composite resin restorations?
Answer: Eugenol weakens the composite resin by inhibiting polymerization
Eugenol is a plasticizer that inhibits the free-radical polymerization of resin composites, leading to incomplete curing and restoration failure.
When placing a sealant on a partially erupted molar where the distal portion is still under the operculum, the EFDA should:
Answer: Defer sealant placement until full eruption to ensure isolation
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.
A varnish-type liner such as copal varnish is primarily used under amalgam restorations to:
Answer: Seal dentinal tubules and reduce microleakage initially
Copal varnish seals dentinal tubules to reduce early microleakage and fluid sensitivity, though it dissipates as the amalgam margins tighten over time.
Which of the following correctly describes the 'sandwich technique' in restorative dentistry?
Answer: Using a glass ionomer base beneath composite resin to combine fluoride release with esthetic overlay
The sandwich technique places a glass ionomer base (for fluoride and adhesion) beneath composite resin (for esthetics and strength) in a single restoration.
Hydrophilic pit and fissure sealants were developed to address which common clinical problem?
Answer: Sealant failure caused by minor moisture contamination
Hydrophilic sealants are designed to bond despite slight moisture contamination, addressing the most common cause of sealant failure in clinical settings.
When evaluating a completed sealant clinically, which finding would require immediate repair or replacement?
Answer: An explorer tip catching or dropping into a void within the sealant
An explorer catching in a void indicates incomplete coverage or air entrapment, creating a site for plaque accumulation and caries initiation under the sealant.