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EFDA TEST EXAM 1 - EXPANDED FUNCTIONS
DENTAL ASSISTANT – EFDA ACTUAL TEST WITH
200+ QUESTIONS AND DETAILED ANSWERS THE
LATEST UPDATED EXAM BANK INCLUDING EXPERT
VERIFIED SOLUTIONS FOR A SURE PASS
What is the most effective use for zinc oxide eugenol cement?
A. A sedative agent
B. A permanent restoration
C. A pulp stimulator
D. A pulpal sealer - ANSWER: A. A sedative agent
Which of the following describes the MECHANICAL mixing of alloy and
mercury?
A. Trituration
B. Manipulation
C. Amalgamation
D. Gamma 2 phase - ANSWER: A. Trituration
What is the composition of amalgam?
A. Mercury, silver, copper, zinc
B. Mercury, silver, tin, copper and zinc
C. Mercury, copper and zinc
D. Mercury, tin, copper and zinc - ANSWER: B. Mercury, silver, tin, copper
and zinc
What is the composition of alloy powder?
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A. Mercury, silver, tin, copper & zinc
B. Mercury, silver, copper & zinc
C. Mercury, silver, tin & zinc
D. Silver, tin, copper & zinc - ANSWER: D. Silver, tin, copper & zinc
The consequence of mercury mixing with tin in an amalgam that also results in
excessive corrosion is known as:
A. Gamma I
B. Gamma II
C. Gamma III
D. Gamma IV - ANSWER: B. Gamma II
Increased amounts of in amalgam can reduce problems with creep and gamma
2 phase
A. Silver
B. Tin
C. Copper
D. Zinc - ANSWER: C. Copper
Which of the following best describes dispersion (admired) type alloy?
A. Micro-cut particle size fillings
B. Round shaped particle size
C. Regular cut particle size fillings
D. A mixture of different particle types - ANSWER: D. A mixture of different
particle types
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Amalgam particles that re irregular in shape require more mercury, and greater
condensing force best describes:
A. Conventional or lathe-cut
B. Spherical
C. Admixed
D. Combination - ANSWER: Conventional, or lathe-cut
How will a higher percentage of mercury in the amalgam affect its properties?
A. Decreases the setting time
B. Weakens the restoration
C. Makes polishing the surface easier
D. Decreases expansion - ANSWER: B. Weakens the restoration
What undesirable property is caused by bubbles of hydrogen from water due to
moisture contamination?
A. An increase in the setting time
B. Excessive delayed expansion
C. An increase in tensile strength
D. A decrease in the setting time - ANSWER: B. Excessive delayed expansion
What is creep?
A. The slow movement of an amalgam restoration under compressive forces
over a period of time
B. Expansion of the amalgam restoration
C. Moisture contamination
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D. Too much mercury in the alloy - ANSWER: A. Slow movement of an
amalgam restoration under compressive forced over a period of time
How will adequate condensation pressure strengthen the final restoration?
A. By eliminating voids and reducing excess mercury
B. By reducing excess mercury only
C. By decreasing contraction
D. By increasing expansion - ANSWER: A. By eliminating voids and reducing
excess mercury
What is ONE function of a properly positioned wedge?
A. Restore proximal contours
B. To create retention of the restoration
C. Adaptation of the matrix band to the tooth to prevent overhangs
D. To create a missing wall for restorative materials. - ANSWER: C.
Adaptation of the matrix band to the tooth to prevent overhangs
Why would an operator choose to use a secondary matrix strip?
A. To avoided creating an overhand
B. To compensate for extra space between the tooth and primary matrix
C. To compensate for the thickness of the primary matrix
D. To stabilize the matrix retainer - ANSWER: B. To compensate for extra
space between the tooth and primary matrix
When placing the matrix band, the smaller diameter of the loop is directed towards
the:
A. Occlusal
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1|Page
EFDA TEST EXAM 1 - EXPANDED FUNCTIONS
DENTAL ASSISTANT – EFDA ACTUAL TEST WITH
200+ QUESTIONS AND DETAILED ANSWERS THE
LATEST UPDATED EXAM BANK INCLUDING EXPERT
VERIFIED SOLUTIONS FOR A SURE PASS
What is the most effective use for zinc oxide eugenol cement?
A. A sedative agent
B. A permanent restoration
C. A pulp stimulator
D. A pulpal sealer - ANSWER: A. A sedative agent
Which of the following describes the MECHANICAL mixing of alloy and
mercury?
A. Trituration
B. Manipulation
C. Amalgamation
D. Gamma 2 phase - ANSWER: A. Trituration
What is the composition of amalgam?
A. Mercury, silver, copper, zinc
B. Mercury, silver, tin, copper and zinc
C. Mercury, copper and zinc
D. Mercury, tin, copper and zinc - ANSWER: B. Mercury, silver, tin, copper
and zinc
What is the composition of alloy powder?
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A. Mercury, silver, tin, copper & zinc
B. Mercury, silver, copper & zinc
C. Mercury, silver, tin & zinc
D. Silver, tin, copper & zinc - ANSWER: D. Silver, tin, copper & zinc
The consequence of mercury mixing with tin in an amalgam that also results in
excessive corrosion is known as:
A. Gamma I
B. Gamma II
C. Gamma III
D. Gamma IV - ANSWER: B. Gamma II
Increased amounts of in amalgam can reduce problems with creep and gamma
2 phase
A. Silver
B. Tin
C. Copper
D. Zinc - ANSWER: C. Copper
Which of the following best describes dispersion (admired) type alloy?
A. Micro-cut particle size fillings
B. Round shaped particle size
C. Regular cut particle size fillings
D. A mixture of different particle types - ANSWER: D. A mixture of different
particle types
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Amalgam particles that re irregular in shape require more mercury, and greater
condensing force best describes:
A. Conventional or lathe-cut
B. Spherical
C. Admixed
D. Combination - ANSWER: Conventional, or lathe-cut
How will a higher percentage of mercury in the amalgam affect its properties?
A. Decreases the setting time
B. Weakens the restoration
C. Makes polishing the surface easier
D. Decreases expansion - ANSWER: B. Weakens the restoration
What undesirable property is caused by bubbles of hydrogen from water due to
moisture contamination?
A. An increase in the setting time
B. Excessive delayed expansion
C. An increase in tensile strength
D. A decrease in the setting time - ANSWER: B. Excessive delayed expansion
What is creep?
A. The slow movement of an amalgam restoration under compressive forces
over a period of time
B. Expansion of the amalgam restoration
C. Moisture contamination
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D. Too much mercury in the alloy - ANSWER: A. Slow movement of an
amalgam restoration under compressive forced over a period of time
How will adequate condensation pressure strengthen the final restoration?
A. By eliminating voids and reducing excess mercury
B. By reducing excess mercury only
C. By decreasing contraction
D. By increasing expansion - ANSWER: A. By eliminating voids and reducing
excess mercury
What is ONE function of a properly positioned wedge?
A. Restore proximal contours
B. To create retention of the restoration
C. Adaptation of the matrix band to the tooth to prevent overhangs
D. To create a missing wall for restorative materials. - ANSWER: C.
Adaptation of the matrix band to the tooth to prevent overhangs
Why would an operator choose to use a secondary matrix strip?
A. To avoided creating an overhand
B. To compensate for extra space between the tooth and primary matrix
C. To compensate for the thickness of the primary matrix
D. To stabilize the matrix retainer - ANSWER: B. To compensate for extra
space between the tooth and primary matrix
When placing the matrix band, the smaller diameter of the loop is directed towards
the:
A. Occlusal
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