EFDA EXAM AND STUDY GUIDE NEWEST 2026/2027
TEST BANK| COMPLETE 650 REAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) GRADED A+| EFDA FINAL EXAM PREP
(BRAND NEW!!)
Question 1
What is the primary purpose of condensing amalgam into a
cavity preparation?
A) To shape the occlusal anatomy
B) To remove excess mercury and adapt the material to cavity
walls
C) To polish the restoration
D) To create a chemical bond to tooth structure
Correct Answer: B
1
,Rationale: Condensation (packing) of amalgam serves two critical
purposes: (1) It compacts the alloy particles together, forcing out
excess mercury, and (2) It adapts the amalgam intimately to the
cavity walls and margins. Amalgam does not chemically bond to
tooth structure; it is retained mechanically through undercuts and
friction .
Question 2
An amalgam restoration that exhibits a "doughnut-shaped" mark
on articulating paper indicates:
A) Light centric occlusion
B) Heavy centric occlusion (hyperocclusion)
C) No centric occlusion
D) Excursive interference
Correct Answer: B
2
,Rationale: Doughnut-shaped (ring-shaped) marks with a clear
center occur when a restoration contacts too heavily in centric
occlusion. The heavy pressure displaces the articulating paper from
the central contact area, leaving a ring of transferred color around
the periphery. This restoration requires adjustment .
Question 3
After mixing zinc phosphate cement, the mix should have a:
A) Thin, watery consistency
B) Thick, putty-like consistency
C) Stringy, "gossamer" appearance when the spatula is lifted
from the slab
D) Grainy, crumbly texture
Correct Answer: C
*Rationale: Properly mixed zinc phosphate cement should exhibit
a stringy or "gossamer" (cobweb-like) appearance when the
3
, spatula is lifted approximately 1 cm from the glass slab. This
indicates the correct working consistency for cementation
procedures .*
Question 4
What is the recommended minimum thickness for calcium
hydroxide when used as a pulp-protecting liner?
A) 0.1 mm
B) 0.5 mm
C) 1.0 mm
D) 1.5 mm
Correct Answer: B
Rationale: Calcium hydroxide should be placed at a minimum
thickness of 0.5 mm to provide adequate protection for the pulp
and to stimulate reparative dentin formation. Thinner applications
4
TEST BANK| COMPLETE 650 REAL EXAM QUESTIONS
AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) GRADED A+| EFDA FINAL EXAM PREP
(BRAND NEW!!)
Question 1
What is the primary purpose of condensing amalgam into a
cavity preparation?
A) To shape the occlusal anatomy
B) To remove excess mercury and adapt the material to cavity
walls
C) To polish the restoration
D) To create a chemical bond to tooth structure
Correct Answer: B
1
,Rationale: Condensation (packing) of amalgam serves two critical
purposes: (1) It compacts the alloy particles together, forcing out
excess mercury, and (2) It adapts the amalgam intimately to the
cavity walls and margins. Amalgam does not chemically bond to
tooth structure; it is retained mechanically through undercuts and
friction .
Question 2
An amalgam restoration that exhibits a "doughnut-shaped" mark
on articulating paper indicates:
A) Light centric occlusion
B) Heavy centric occlusion (hyperocclusion)
C) No centric occlusion
D) Excursive interference
Correct Answer: B
2
,Rationale: Doughnut-shaped (ring-shaped) marks with a clear
center occur when a restoration contacts too heavily in centric
occlusion. The heavy pressure displaces the articulating paper from
the central contact area, leaving a ring of transferred color around
the periphery. This restoration requires adjustment .
Question 3
After mixing zinc phosphate cement, the mix should have a:
A) Thin, watery consistency
B) Thick, putty-like consistency
C) Stringy, "gossamer" appearance when the spatula is lifted
from the slab
D) Grainy, crumbly texture
Correct Answer: C
*Rationale: Properly mixed zinc phosphate cement should exhibit
a stringy or "gossamer" (cobweb-like) appearance when the
3
, spatula is lifted approximately 1 cm from the glass slab. This
indicates the correct working consistency for cementation
procedures .*
Question 4
What is the recommended minimum thickness for calcium
hydroxide when used as a pulp-protecting liner?
A) 0.1 mm
B) 0.5 mm
C) 1.0 mm
D) 1.5 mm
Correct Answer: B
Rationale: Calcium hydroxide should be placed at a minimum
thickness of 0.5 mm to provide adequate protection for the pulp
and to stimulate reparative dentin formation. Thinner applications
4
