EFDA review practice exam Latest Update 2025-
2026 50 Questions and 100% Verified Correct
Answers Guaranteed A+
An overextension (flash) @ the cavosurface margin is indicated by:
1. a space btwn the restoration + the enamel wall
2. a catch as the explorer moves from moves from tooth to amalgam
3. a catch as the explorer moves from amalgam to tooth
4. a catch as the explorer is moved in both directions - CORRECT ANSWER: 2. a catch
as the explorer moves from moves from tooth to amalgam
An undercontoured class V restoration:
1. will displace the gingival from its normal position
2. is caused by not removing enough of the restorative material
3. will increase plaque accumulation + recurrent decay
4. is acceptable - CORRECT ANSWER: 3. will increase plaque accumulation +
recurrent decay
Basic remediable intraoral tasks and/or procedures include all of the following except:
1. impressions for diagnostic models or mouthguard
2. suture removal
3. placement of gingival retraction cord prior to direction impression
4. placement of surgical dressings - CORRECT ANSWER: 3. placement of gingival
retraction cord prior to direction impression
Cavity preparations with rotary instruments generate cutting debris, some of which is
compacted in a layer onto the dentinal surface. That layer of material is known as:
1. wet dentin
2. smear layer
, 3. peritubular dentin
4. collagen fibril network - CORRECT ANSWER: 2. smear layer
Dentin is normally yellowish-white and darker than enamel. The composition of dentin is
approximately:
1. 90% inorganic material, 2.0% organic material, 8% water
2. 95.5% inorganic material, 0.5% organic material, 4% water
3. 70% inorganic material, 20% organic material, 10% water
4. 85% inorganic material, 1.0% organic material, 10% water - CORRECT ANSWER: 3.
70% inorganic material, 20% organic material, 10% water
How will adequate condensation pressure strengthen the final restoration?
1. by eliminating voids + reducing excess mercury
2. by reducing excess mercury only
3. by decreasing the contraction
4. by increasing expansion - CORRECT ANSWER: 1. by eliminating voids + reducing
excess mercury
If the depth of a tooth preparation for amalgam extends just into dentin (just beyond the
DEJ), what should be placed just prior to the amalgam?
1. copal varnish only
2. copal varnish followed by zinc phosphate
3. calcium hydroxide followed by copal varnish
4. copal varnish followed by GI - CORRECT ANSWER: 1. copal varnish only
If you are assisting a right-handed operator, where do you sit?
1. btwn 8-12 o'clock position
2. btwn 8-10 o'clock position
2026 50 Questions and 100% Verified Correct
Answers Guaranteed A+
An overextension (flash) @ the cavosurface margin is indicated by:
1. a space btwn the restoration + the enamel wall
2. a catch as the explorer moves from moves from tooth to amalgam
3. a catch as the explorer moves from amalgam to tooth
4. a catch as the explorer is moved in both directions - CORRECT ANSWER: 2. a catch
as the explorer moves from moves from tooth to amalgam
An undercontoured class V restoration:
1. will displace the gingival from its normal position
2. is caused by not removing enough of the restorative material
3. will increase plaque accumulation + recurrent decay
4. is acceptable - CORRECT ANSWER: 3. will increase plaque accumulation +
recurrent decay
Basic remediable intraoral tasks and/or procedures include all of the following except:
1. impressions for diagnostic models or mouthguard
2. suture removal
3. placement of gingival retraction cord prior to direction impression
4. placement of surgical dressings - CORRECT ANSWER: 3. placement of gingival
retraction cord prior to direction impression
Cavity preparations with rotary instruments generate cutting debris, some of which is
compacted in a layer onto the dentinal surface. That layer of material is known as:
1. wet dentin
2. smear layer
, 3. peritubular dentin
4. collagen fibril network - CORRECT ANSWER: 2. smear layer
Dentin is normally yellowish-white and darker than enamel. The composition of dentin is
approximately:
1. 90% inorganic material, 2.0% organic material, 8% water
2. 95.5% inorganic material, 0.5% organic material, 4% water
3. 70% inorganic material, 20% organic material, 10% water
4. 85% inorganic material, 1.0% organic material, 10% water - CORRECT ANSWER: 3.
70% inorganic material, 20% organic material, 10% water
How will adequate condensation pressure strengthen the final restoration?
1. by eliminating voids + reducing excess mercury
2. by reducing excess mercury only
3. by decreasing the contraction
4. by increasing expansion - CORRECT ANSWER: 1. by eliminating voids + reducing
excess mercury
If the depth of a tooth preparation for amalgam extends just into dentin (just beyond the
DEJ), what should be placed just prior to the amalgam?
1. copal varnish only
2. copal varnish followed by zinc phosphate
3. calcium hydroxide followed by copal varnish
4. copal varnish followed by GI - CORRECT ANSWER: 1. copal varnish only
If you are assisting a right-handed operator, where do you sit?
1. btwn 8-12 o'clock position
2. btwn 8-10 o'clock position
