EFDA Amalgam and Composite Restorations 3

Question 1

A 'high' amalgam restoration on occlusal check reveals a shiny spot on the restoration. This indicates:

Accepted Answer

A premature occlusal contact that needs adjustment

Answer

A shiny spot (burnish mark) from articulating paper indicates a high spot that must be adjusted to prevent fracture or patient discomfort.

Question 2

Which composite resin type provides the BEST wear resistance for posterior occlusal restorations?

Accepted Answer

Hybrid or nanohybrid composite

Answer

Hybrid and nanohybrid composites contain both large and small filler particles, providing superior strength and wear resistance for posterior teeth.

Question 3

The purpose of placing a liner such as calcium hydroxide in a deep cavity preparation before amalgam is to:

Accepted Answer

Stimulate secondary dentin formation and protect the pulp

Answer

Calcium hydroxide stimulates reparative (tertiary) dentin formation and protects the pulp in areas of near-exposure.

Question 4

When using the acid-etch technique for composite bonding, phosphoric acid is applied to enamel for approximately:

Accepted Answer

15–30 seconds

Answer

Phosphoric acid (35–37%) is applied to enamel for 15–30 seconds to create adequate microporosities for resin tag formation.

Question 5

An EFDA notices the composite restoration has voids after initial cure. The BEST course of action is to:

Accepted Answer

Inform the dentist immediately for evaluation and repair

Answer

Voids compromise restoration integrity and invite microleakage; the dentist must evaluate whether repair or replacement is needed.

(EFDA) Expanded Function Dental Auxiliary Practice Test