Expanded Functions Dental Assistants {EFDA} FINAL EXAM STUDY GUIDE | COMPLETE 2025–2026 REVIEW | 120 VERIFIED QUESTIONS & ANSWERS A +

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EFDA TEST EXAM 1 - EXPANDED FUNCTIONS
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DENTAL ASSISTANT – EFDA ACTUAL TEST WITH
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200+ QUESTIONS AND DETAILED ANSWERS THE
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LATEST UPDATED EXAM BANK INCLUDING EXPERT
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VERIFIED SOLUTIONS FOR A SURE PASS
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What is the most effective use for zinc oxide eugenol cement?
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A. A sedative agent
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B. A permanent restoration
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C. A pulp stimulator
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D. A pulpal sealer - ANSWER: A. A sedative agent
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Which of the following describes the MECHANICAL mixing of alloy and mercury?
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A. Trituration
B. Manipulation
C. Amalgamation
D. Gamma 2 phase - ANSWER: A. Trituration
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What is the composition of amalgam?
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A. Mercury, silver, copper, zinc w w w




B. Mercury, silver, tin, copper and zinc w w w w w




C. Mercury, copper and zinc w w w




D. Mercury, tin, copper and zinc - ANSWER: B. Mercury, silver, tin, copper
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and zinc
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What is the composition of alloy powder?
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A. Mercury, silver, tin, copper & zinc w w w w w




B. Mercury, silver, copper & zinc w w w w




C. Mercury, silver, tin & zinc w w w w




D. Silver, tin, copper & zinc - ANSWER: D. Silver, tin, copper & zinc
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The consequence of mercury mixing with tin in an amalgam that also results in
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excessive corrosion is known as:
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A. Gamma I w




B. Gamma II w




C. Gamma III w




D. Gamma IV - ANSWER: B. Gamma II w w w w w w




Increased amounts of w w in amalgam can reduce problems with creep and gamma
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2 phase
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A. Silver
B. Tin


C. Copper
D. Zinc - ANSWER: C. Copper
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Which of the following best describes dispersion (admired) type alloy?
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A. Micro-cut particle size fillings w w w




B. Round shaped particle size w w w




C. Regular cut particle size fillings
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D. A mixture of different particle types - ANSWER: D. A mixture of different
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particle types
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Amalgam particles that re irregular in shape require more mercury, and greater
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condensing force best describes:
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A. Conventional or lathe-cut w w




B. Spherical
C. Admixed
D. Combination - ANSWER: Conventional, or lathe-cut w w w w w




How will a higher percentage of mercury in the amalgam affect its properties?
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A. Decreases the setting time w w w




B. Weakens the restoration w w




C. Makes polishing the surface easier
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D. Decreases expansion - ANSWER: B. Weakens the restoration
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What undesirable property is caused by bubbles of hydrogen from water due to moisture
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contamination?
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A. An increase in the setting time
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B. Excessive delayed expansion w w




C. An increase in tensile strength
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D. A decrease in the setting time - ANSWER: B. Excessive delayed expansion
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What is creep? w w




A. The slow movement of an amalgam restoration under compressive forces
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over a period of time
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B. Expansion of the amalgam restoration w w w w




C. Moisture contamination w

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D. Too much mercury in the alloy - ANSWER: A. Slow movement of an
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amalgam restoration under compressive forced over a period of time
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How will adequate condensation pressure strengthen the final restoration?
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A. By eliminating voids and reducing excess mercury
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B. By reducing excess mercury only
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C. By decreasing contraction
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D. By increasing expansion - ANSWER: A. By eliminating voids and reducing
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excess mercury
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What is ONE function of a properly positioned wedge?
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A. Restore proximal contours w w




B. To create retention of the restoration
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C. Adaptation of the matrix band to the tooth to prevent overhangs
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D. To create a missing wall for restorative materials. - ANSWER: C.
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Adaptation of the matrix band to the tooth to prevent overhangs
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Why would an operator choose to use a secondary matrix strip?
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A. To avoided creating an overhand
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B. To compensate for extra space between the tooth and primary matrix
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C. To compensate for the thickness of the primary matrix
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D. To stabilize the matrix retainer - ANSWER: B. To compensate for extra
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space between the tooth and primary matrix
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When placing the matrix band, the smaller diameter of the loop is directed towards the:
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A. Occlusal