EFDA REVIEW 180 QUESTIONS AND ANSWERS 2026/2027.
EXPANDED FUNCTIONS DENTAL ASSISTING
FUNDAMENTALS VERIFIED QUESTIONS & ACCURATE
ANSWERS || GRADED A+
180 QUESTIONS AND ANSWERS
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
The following statements all apply to direct supervision except:
1. dentist is physically present during the performance of delegated "acts"
2. dentist checks the pt before pt leaves the office
3. dentist is personally operating on a pt
4. delegated procedures are performed pursuant to dentist's order and under his/her
license - CORRECT ANSWER - 3. dentist is personally operating on a pt
The following statements are true regarding the dental pulp except one. Which one
is the exception?
1. provides nutrients + fluids to the dentin thru the blood supply
2. contains nerve fibers that mediate pain sensations
,3. contains odontoblasts which help form primary, secondary, and reparative dentin
4. increases in size with age - CORRECT ANSWER - 4. increases in size with
age
On a tooth with extensive gingival recession below the CEJ, which of the
following would be visible?
1. anatomical crown
2. clinical crown
3. anatomical + clinical crown
4. anatomical + clinical root - CORRECT ANSWER - 3. anatomical + clinical
crown
Which of the following statements most accurately describes the periodontium?
1. the oral hard + soft tissues that support the teeth
2. enamel + cementum located on the exterior surfaces of the teeth
3. soft tissue that is loosely attached to the underlying bone
4. cuff of tissue that is not attached to the tooth - CORRECT ANSWER - 1.
the oral hard + soft tissues that support the teeth
When would an open sandwich technique with GI be recommended?
1. whenever a metal matrix band is used
2. whenever the gingival margin of the proximal box is deeper than ideal
3. it is recommended with every class II composite restoration
,4. when the proximal box is wider buccolingually than ideal - CORRECT
ANSWER - 2. whenever the gingival margin of the proximal box is deeper than
ideal
Which of the following materials should not be placed directly on dentin d/t the
irritation it may cause to the tooth?
1. copal varnish
2. GI
3. zinc phosphate cement
4. calcium hydroxide - CORRECT ANSWER - 3. zinc phosphate cement
Which of the following statements is true regarding GI?
1. GI is more abrasion-resistant than amalgam
2. GI is more moisture-sensitive than composite
3. GI provides better esthetics than composite
4. GI bonds chemically and mechanically to dentin - CORRECT ANSWER -
4. GI bonds chemically and mechanically to dentin
Tooth #19 MODB RUC is to be restored with amalgam. The overfill on the distal
+ distobuccal cusps should be:
1. equal to the cavosurface margin
2. to the desired final height of the restoration
3. slightly higher occlusally than the neighboring cusp of the adjacent tooth
, 4. slightly shorter than desired final height of restoration - CORRECT
ANSWER - 3. slightly higher occlusally than the neighboring cusp of the
adjacent tooth
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
This embrasure is located btwn the marginal ridge + contact area and can be
formed by a sickle explorer in soft amalgam @ a 45deg angle:
1. facial
2. lingual
3. occlusal
4. gingival - CORRECT ANSWER - 3. occlusal
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
EXPANDED FUNCTIONS DENTAL ASSISTING
FUNDAMENTALS VERIFIED QUESTIONS & ACCURATE
ANSWERS || GRADED A+
180 QUESTIONS AND ANSWERS
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
The following statements all apply to direct supervision except:
1. dentist is physically present during the performance of delegated "acts"
2. dentist checks the pt before pt leaves the office
3. dentist is personally operating on a pt
4. delegated procedures are performed pursuant to dentist's order and under his/her
license - CORRECT ANSWER - 3. dentist is personally operating on a pt
The following statements are true regarding the dental pulp except one. Which one
is the exception?
1. provides nutrients + fluids to the dentin thru the blood supply
2. contains nerve fibers that mediate pain sensations
,3. contains odontoblasts which help form primary, secondary, and reparative dentin
4. increases in size with age - CORRECT ANSWER - 4. increases in size with
age
On a tooth with extensive gingival recession below the CEJ, which of the
following would be visible?
1. anatomical crown
2. clinical crown
3. anatomical + clinical crown
4. anatomical + clinical root - CORRECT ANSWER - 3. anatomical + clinical
crown
Which of the following statements most accurately describes the periodontium?
1. the oral hard + soft tissues that support the teeth
2. enamel + cementum located on the exterior surfaces of the teeth
3. soft tissue that is loosely attached to the underlying bone
4. cuff of tissue that is not attached to the tooth - CORRECT ANSWER - 1.
the oral hard + soft tissues that support the teeth
When would an open sandwich technique with GI be recommended?
1. whenever a metal matrix band is used
2. whenever the gingival margin of the proximal box is deeper than ideal
3. it is recommended with every class II composite restoration
,4. when the proximal box is wider buccolingually than ideal - CORRECT
ANSWER - 2. whenever the gingival margin of the proximal box is deeper than
ideal
Which of the following materials should not be placed directly on dentin d/t the
irritation it may cause to the tooth?
1. copal varnish
2. GI
3. zinc phosphate cement
4. calcium hydroxide - CORRECT ANSWER - 3. zinc phosphate cement
Which of the following statements is true regarding GI?
1. GI is more abrasion-resistant than amalgam
2. GI is more moisture-sensitive than composite
3. GI provides better esthetics than composite
4. GI bonds chemically and mechanically to dentin - CORRECT ANSWER -
4. GI bonds chemically and mechanically to dentin
Tooth #19 MODB RUC is to be restored with amalgam. The overfill on the distal
+ distobuccal cusps should be:
1. equal to the cavosurface margin
2. to the desired final height of the restoration
3. slightly higher occlusally than the neighboring cusp of the adjacent tooth
, 4. slightly shorter than desired final height of restoration - CORRECT
ANSWER - 3. slightly higher occlusally than the neighboring cusp of the
adjacent tooth
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
This embrasure is located btwn the marginal ridge + contact area and can be
formed by a sickle explorer in soft amalgam @ a 45deg angle:
1. facial
2. lingual
3. occlusal
4. gingival - CORRECT ANSWER - 3. occlusal
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
