1|Page
EFDA EXAM STUDY GUIDE BANK 2025 ACTUAL
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) ALL ANSWERD {200
Q & A} ALREADY GRADED A+ / EFDA STUDY GUIDE
EXAM/ FREQUENTLY TESTED QUESTIONS |
GUARANTEED PASS
What is the hybrid layer?
A. When the resin penetrates into the dentinal tubules
B. A combination of dentin and polymer that occurs during dentin
conditioning
C. A layer that helps reduce the amount of composite shrinkage
D. A layer with poor bond strength - ✔✔✔ Correct Answer > B. A
combination of dentin and polymer that occurs during dentin
conditioning
What are the instruments of choice for final polishing of a
composite restoration to attain a high luster?
A. Impregnated rubber polishing points, super fine sandpaper
discs, or polishing pastes
B. Fluted burs of diamond burs
C. Coarse, medium, fine discs
,2|Page
D. Fluted burs and polishing pastes - ✔✔✔ Correct Answer > A.
Impregnated rubber polishing points, super fine sandpaper discs,
or polishing pastes
Which of the following esthetic restorative materials is
composed of inorganic filler with a matrix of BUS-GMA?
A. Silicate
B. Unfilled acrylic resin
C. Composite resin
D. Glass ionomer - ✔✔✔ Correct Answer > C. Composite resin
Cavity preparations with rotary instruments generate cutting
debris, some of which is compacted unavoidably into a layer on
the cut dentinal surface. That layer of material is known as:
A. Wet dentin
B. Smear layer
C. Peritubular dentin
Collagen fibril network - ✔✔✔ Correct Answer > B. Smear layer
What kind of dentin is characterized by microstructural change in
dentin that is difficult to condition and thus retain a composite
restoration?
A. Primary
,3|Page
B. Secondary
C. Tertiary (reparative)
D. Sclerotic - ✔✔✔ Correct Answer > D. Sclerotic
Wetting agents that are compatible with moist dentin and
bonding agents are known as:
A. Enamel conditioners
B. Bonding agents
C. Dentinal primers
D. Dentinal composites - ✔✔✔ Correct Answer > C. Denial primers
What is the recommended procedure for placing enchant on a
cavity preparation?
A. The enchant is applied approximately 4mm beyond the
preparation
B. Etchant is applied on the dentin and enamel simultaneously
for 15-30 seconds for permanent teeth
C. Scrub the etchant over the surface for enhanced retention
D. Apply etchant to the enamel for 15 seconds, then spread the
etchant onto the dentin for another 15 seconds, for a total of 30
seconds. - ✔✔✔ Correct Answer > D. Apply etchant to the enamel for 15
seconds, then spread the etchant onto the dentin for another 15
seconds, for a total of 30 seconds.
, 4|Page
The retention between bonding agent and composite resins is:
A. Physical
B. Chemical
C. Mechanical
D. Biological - ✔✔✔ Correct Answer > B. Chemical
Where should the operator place the wand of the curing light
when curing composite resin?
A. Touching the composite
B. 1-2mm from the composite
C. 2-3mm from the composite
D. 5-6mm from the composite - ✔✔✔ Correct Answer > C. 2-3mm from
the composite
The tension of resin to tooth structure is:
A. Chemical
B. Mechanical
C. Retained by undercuts
D. Unnecessary - ✔✔✔ Correct Answer > B. Mechanical
What dental material contains resin mixed with inorganic fillers?
EFDA EXAM STUDY GUIDE BANK 2025 ACTUAL
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) ALL ANSWERD {200
Q & A} ALREADY GRADED A+ / EFDA STUDY GUIDE
EXAM/ FREQUENTLY TESTED QUESTIONS |
GUARANTEED PASS
What is the hybrid layer?
A. When the resin penetrates into the dentinal tubules
B. A combination of dentin and polymer that occurs during dentin
conditioning
C. A layer that helps reduce the amount of composite shrinkage
D. A layer with poor bond strength - ✔✔✔ Correct Answer > B. A
combination of dentin and polymer that occurs during dentin
conditioning
What are the instruments of choice for final polishing of a
composite restoration to attain a high luster?
A. Impregnated rubber polishing points, super fine sandpaper
discs, or polishing pastes
B. Fluted burs of diamond burs
C. Coarse, medium, fine discs
,2|Page
D. Fluted burs and polishing pastes - ✔✔✔ Correct Answer > A.
Impregnated rubber polishing points, super fine sandpaper discs,
or polishing pastes
Which of the following esthetic restorative materials is
composed of inorganic filler with a matrix of BUS-GMA?
A. Silicate
B. Unfilled acrylic resin
C. Composite resin
D. Glass ionomer - ✔✔✔ Correct Answer > C. Composite resin
Cavity preparations with rotary instruments generate cutting
debris, some of which is compacted unavoidably into a layer on
the cut dentinal surface. That layer of material is known as:
A. Wet dentin
B. Smear layer
C. Peritubular dentin
Collagen fibril network - ✔✔✔ Correct Answer > B. Smear layer
What kind of dentin is characterized by microstructural change in
dentin that is difficult to condition and thus retain a composite
restoration?
A. Primary
,3|Page
B. Secondary
C. Tertiary (reparative)
D. Sclerotic - ✔✔✔ Correct Answer > D. Sclerotic
Wetting agents that are compatible with moist dentin and
bonding agents are known as:
A. Enamel conditioners
B. Bonding agents
C. Dentinal primers
D. Dentinal composites - ✔✔✔ Correct Answer > C. Denial primers
What is the recommended procedure for placing enchant on a
cavity preparation?
A. The enchant is applied approximately 4mm beyond the
preparation
B. Etchant is applied on the dentin and enamel simultaneously
for 15-30 seconds for permanent teeth
C. Scrub the etchant over the surface for enhanced retention
D. Apply etchant to the enamel for 15 seconds, then spread the
etchant onto the dentin for another 15 seconds, for a total of 30
seconds. - ✔✔✔ Correct Answer > D. Apply etchant to the enamel for 15
seconds, then spread the etchant onto the dentin for another 15
seconds, for a total of 30 seconds.
, 4|Page
The retention between bonding agent and composite resins is:
A. Physical
B. Chemical
C. Mechanical
D. Biological - ✔✔✔ Correct Answer > B. Chemical
Where should the operator place the wand of the curing light
when curing composite resin?
A. Touching the composite
B. 1-2mm from the composite
C. 2-3mm from the composite
D. 5-6mm from the composite - ✔✔✔ Correct Answer > C. 2-3mm from
the composite
The tension of resin to tooth structure is:
A. Chemical
B. Mechanical
C. Retained by undercuts
D. Unnecessary - ✔✔✔ Correct Answer > B. Mechanical
What dental material contains resin mixed with inorganic fillers?
