Expanded Function Dental Assistant Exam (EFDA)
2025 ACTUAL EXAM QUESTIONS WITH ANSWERS
TESTBANK
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
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
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
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
4. a catch as the explorer is moved in both directions
2. a catch as the explorer moves from moves from tooth to amalgam
Which of the teeth in the mouth is the largest with 5 functional cusps?
1. mandibular second molar
2. maxillary first molar
3. mandibular first molar
4. all mandibular molars
3. mandibular first molar
You are restoring #18 MOD + #19 MOD back-to-back. You choose to restore #18 first. Upon
removing the band, you see the mesial is overcontoured. What should be done?
1. carve the mesial contour until it is anatomically correct before restoring #19
2. restore the distal of #19 to be undercontoured to fit the mesial of #18
3. remove the restoration on #18 and redo it before filling #19
4. carve the mesial of #18 until it is undercontoured before restoring #19
1. carve the mesial contour until it is anatomically correct before restoring #19
When is a contra-angle retainer recommended?
1. one or more of the lingual cusps are missing
2. one or more of the buccal cusps are missing
3. when the proximal depth is wider than the width of a universal matrix band
4. for all large class II amalgams
2. one or more of the buccal cusps are missing
,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
2. smear layer
When should the EFDA select a shade for composite resin placement?
1. any time during the procedure
2. after isolation
3. before isolation
4. when teeth are completely dry
3. before isolation
When using discs for finishing a composite resin:
1. rotate the disc at high speed
2. use the disc over the entire tooth surface
3. use in any order of abrasiveness, going back + forth between grits
4. wipe or rinse the abrasive residue off of the tooth when changing discs
4. wipe or rinse the abrasive residue off of the tooth when changing discs
When posterior teeth are viewed from the occlusal, the proximal contacts are usually located:
1. more lingual in a buccal to lingual direction
2. more distal in a mesial to distal direction
3. more mesial in a mesial to distal direction
4. more buccal in a buccal to lingual direction
4. more buccal in a buccal to lingual direction
Where are the points of the jaw positioned on a properly placed rubber dam clamp?
, 1. at the CEJ
2. at the DEJ
3. apical to the CEJ
4. apical to the DEJ
1. at the CEJ
The points of the jaws of the gingival retractor such as the anterior #212 clamp should be:
1. parallel with the long axis of the tooth
2. parallel with the occlusal plane
3. resting on the gingival tissue
4. dig into the cementum for stability
2. parallel with the occlusal plane
The EFDA must also be careful when performing restorative procedures to avoid causing
pulpitis. This includes proper condensation pressure, care against chemical irritation, and
avoiding ___ of the dentin.
1. reinforcement
2. insulation
3. desiccation
4. stimulation
3. desiccation
What is the term used to describe the movement of the fluid that occurs in the microscopic
openings btwn tooth + restorative materials during thermal dimensional change?
1. percolation
2. expansion + contraction
3. dimensional changes
4. thermal irritation
1. percolation
2025 ACTUAL EXAM QUESTIONS WITH ANSWERS
TESTBANK
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
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
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
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
4. a catch as the explorer is moved in both directions
2. a catch as the explorer moves from moves from tooth to amalgam
Which of the teeth in the mouth is the largest with 5 functional cusps?
1. mandibular second molar
2. maxillary first molar
3. mandibular first molar
4. all mandibular molars
3. mandibular first molar
You are restoring #18 MOD + #19 MOD back-to-back. You choose to restore #18 first. Upon
removing the band, you see the mesial is overcontoured. What should be done?
1. carve the mesial contour until it is anatomically correct before restoring #19
2. restore the distal of #19 to be undercontoured to fit the mesial of #18
3. remove the restoration on #18 and redo it before filling #19
4. carve the mesial of #18 until it is undercontoured before restoring #19
1. carve the mesial contour until it is anatomically correct before restoring #19
When is a contra-angle retainer recommended?
1. one or more of the lingual cusps are missing
2. one or more of the buccal cusps are missing
3. when the proximal depth is wider than the width of a universal matrix band
4. for all large class II amalgams
2. one or more of the buccal cusps are missing
,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
2. smear layer
When should the EFDA select a shade for composite resin placement?
1. any time during the procedure
2. after isolation
3. before isolation
4. when teeth are completely dry
3. before isolation
When using discs for finishing a composite resin:
1. rotate the disc at high speed
2. use the disc over the entire tooth surface
3. use in any order of abrasiveness, going back + forth between grits
4. wipe or rinse the abrasive residue off of the tooth when changing discs
4. wipe or rinse the abrasive residue off of the tooth when changing discs
When posterior teeth are viewed from the occlusal, the proximal contacts are usually located:
1. more lingual in a buccal to lingual direction
2. more distal in a mesial to distal direction
3. more mesial in a mesial to distal direction
4. more buccal in a buccal to lingual direction
4. more buccal in a buccal to lingual direction
Where are the points of the jaw positioned on a properly placed rubber dam clamp?
, 1. at the CEJ
2. at the DEJ
3. apical to the CEJ
4. apical to the DEJ
1. at the CEJ
The points of the jaws of the gingival retractor such as the anterior #212 clamp should be:
1. parallel with the long axis of the tooth
2. parallel with the occlusal plane
3. resting on the gingival tissue
4. dig into the cementum for stability
2. parallel with the occlusal plane
The EFDA must also be careful when performing restorative procedures to avoid causing
pulpitis. This includes proper condensation pressure, care against chemical irritation, and
avoiding ___ of the dentin.
1. reinforcement
2. insulation
3. desiccation
4. stimulation
3. desiccation
What is the term used to describe the movement of the fluid that occurs in the microscopic
openings btwn tooth + restorative materials during thermal dimensional change?
1. percolation
2. expansion + contraction
3. dimensional changes
4. thermal irritation
1. percolation
