, STUVIA EXAM LIBRARY
EXAMINATION DOCUMENT 2026/2027
EFDA - Comprehensive Test Bank
400 Verified Q&A; | Detailed Rationales | NGN-Aligned
A+ VERIFIED - Pass Guaranteed
Course: Expanded Function Dental Auxiliary (EFDA)
Expert Verified | A+ Graded | Latest Update 2026/2027 | Just Released
, TABLE OF CONTENTS
Domain I: Dental Anatomy, Morphology & Occlusion (Q1-Q70)
Domain II: Dental Materials, Impressions & Lab Procedures (Q71-Q140)
Domain III: Infection Control, Safety & Medical Emergencies (Q141-Q210)
Domain IV: Radiology, Pharmacology & Oral Pathology (Q211-Q270)
Domain V: Chairside Assisting, Expanded Functions & Restorative Procedures (Q271-Q340)
Domain VI: Ethics, Law, Patient Management & NGN Clinical Judgment (Q341-Q400)
Answer Key Summary
, Question 1: A 35-year-old patient presents for expanded function procedure on tooth #3. The
dentist has completed preparation and delegated placement of restorative material. The patient
reports allergy to eugenol and has latex sensitivity. You must select appropriate material and
ensure isolation while maintaining four-handed technique. What is the most appropriate clinical
decision for moisture control, material handling, and patient safety? Domain focus: infection
control.
A. Correct approach: Use rubber dam or Isolite with HVE, apply selective etch 15-30s on enamel, place
material in increments, cure per manufacturer, check occlusion with articulating paper, document under direct
supervision to ensure retention and safety
B. Skip isolation and place composite in pooled saliva to save time, cure for 2 seconds only
C. Reuse single-use prophy cup after rinsing with water and continue without handwashing
D. Diagnose caries extent and prescribe antibiotics as EFDA without dentist evaluation
Correct answer: A.
Rationale: For infection control, correct practice follows CDC infection control, ADA material guidelines, and DANB
EFDA scope: proper isolation prevents contamination and microleakage, correct sterilization prevents
cross-infection, and documentation with direct supervision maintains legal compliance. Distractors represent
unsafe shortcuts such as skipping isolation, reusing disposables, exceeding scope, or using expired materials that
cause failure, infection, or liability.
Question 2: NGN Clinical Judgment: You are working as an EFDA. A 12-year-old with controlled
hypertension and history of syncope reports dizziness after prolonged reclining. You are
placing a Class II composite on tooth #3 and notice slight bleeding at gingival margin. Which
prioritization demonstrates correct assessment, infection control, and scope compliance?
Domain focus: dental materials.
A. Place permanent restoration beyond EFDA scope such as final cementation of all-ceramic crown with no
supervision
B. Correct approach: Perform hand hygiene after glove removal, don new gloves, use latex-free dam for latex
allergy, verify autoclave sterilization at 270°F 30 psi for 4 minutes with biological monitoring
C. Ignore latex allergy alert and proceed with latex dam because patient previously tolerated
D. Take final impression with alginate that has been stored dry for 2 weeks without disinfection
Correct answer: B.
Rationale: For dental materials, correct practice follows CDC infection control, ADA material guidelines, and
DANB EFDA scope: proper isolation prevents contamination and microleakage, correct sterilization prevents
cross-infection, and documentation with direct supervision maintains legal compliance. Distractors represent
unsafe shortcuts such as skipping isolation, reusing disposables, exceeding scope, or using expired materials that
cause failure, infection, or liability.
Question 3: During placement of pit and fissure sealants on a 12-year-old with partially erupted
second molars covered by operculum, you evaluate etch pattern and note saliva contamination
after 10 seconds. The dentist is available for supervision. What evidence-based corrective
action prevents sealant failure while following CDC guidelines? Domain focus: radiography
safety.
A. Use expired bonding agent that appears cloudy to avoid waste
B. Increase slow-speed handpiece to 20,000 rpm for polishing to finish faster
C. Correct approach: Apply fluoride varnish with thin even layer after thorough prophylaxis, maintain isolation
for 30-60s, provide post-op instructions to avoid eating for 2 hours and avoid brushing until next day,
document lot number
D. Omit informed consent and HIPAA verification for minor patient
EXAMINATION DOCUMENT 2026/2027
EFDA - Comprehensive Test Bank
400 Verified Q&A; | Detailed Rationales | NGN-Aligned
A+ VERIFIED - Pass Guaranteed
Course: Expanded Function Dental Auxiliary (EFDA)
Expert Verified | A+ Graded | Latest Update 2026/2027 | Just Released
, TABLE OF CONTENTS
Domain I: Dental Anatomy, Morphology & Occlusion (Q1-Q70)
Domain II: Dental Materials, Impressions & Lab Procedures (Q71-Q140)
Domain III: Infection Control, Safety & Medical Emergencies (Q141-Q210)
Domain IV: Radiology, Pharmacology & Oral Pathology (Q211-Q270)
Domain V: Chairside Assisting, Expanded Functions & Restorative Procedures (Q271-Q340)
Domain VI: Ethics, Law, Patient Management & NGN Clinical Judgment (Q341-Q400)
Answer Key Summary
, Question 1: A 35-year-old patient presents for expanded function procedure on tooth #3. The
dentist has completed preparation and delegated placement of restorative material. The patient
reports allergy to eugenol and has latex sensitivity. You must select appropriate material and
ensure isolation while maintaining four-handed technique. What is the most appropriate clinical
decision for moisture control, material handling, and patient safety? Domain focus: infection
control.
A. Correct approach: Use rubber dam or Isolite with HVE, apply selective etch 15-30s on enamel, place
material in increments, cure per manufacturer, check occlusion with articulating paper, document under direct
supervision to ensure retention and safety
B. Skip isolation and place composite in pooled saliva to save time, cure for 2 seconds only
C. Reuse single-use prophy cup after rinsing with water and continue without handwashing
D. Diagnose caries extent and prescribe antibiotics as EFDA without dentist evaluation
Correct answer: A.
Rationale: For infection control, correct practice follows CDC infection control, ADA material guidelines, and DANB
EFDA scope: proper isolation prevents contamination and microleakage, correct sterilization prevents
cross-infection, and documentation with direct supervision maintains legal compliance. Distractors represent
unsafe shortcuts such as skipping isolation, reusing disposables, exceeding scope, or using expired materials that
cause failure, infection, or liability.
Question 2: NGN Clinical Judgment: You are working as an EFDA. A 12-year-old with controlled
hypertension and history of syncope reports dizziness after prolonged reclining. You are
placing a Class II composite on tooth #3 and notice slight bleeding at gingival margin. Which
prioritization demonstrates correct assessment, infection control, and scope compliance?
Domain focus: dental materials.
A. Place permanent restoration beyond EFDA scope such as final cementation of all-ceramic crown with no
supervision
B. Correct approach: Perform hand hygiene after glove removal, don new gloves, use latex-free dam for latex
allergy, verify autoclave sterilization at 270°F 30 psi for 4 minutes with biological monitoring
C. Ignore latex allergy alert and proceed with latex dam because patient previously tolerated
D. Take final impression with alginate that has been stored dry for 2 weeks without disinfection
Correct answer: B.
Rationale: For dental materials, correct practice follows CDC infection control, ADA material guidelines, and
DANB EFDA scope: proper isolation prevents contamination and microleakage, correct sterilization prevents
cross-infection, and documentation with direct supervision maintains legal compliance. Distractors represent
unsafe shortcuts such as skipping isolation, reusing disposables, exceeding scope, or using expired materials that
cause failure, infection, or liability.
Question 3: During placement of pit and fissure sealants on a 12-year-old with partially erupted
second molars covered by operculum, you evaluate etch pattern and note saliva contamination
after 10 seconds. The dentist is available for supervision. What evidence-based corrective
action prevents sealant failure while following CDC guidelines? Domain focus: radiography
safety.
A. Use expired bonding agent that appears cloudy to avoid waste
B. Increase slow-speed handpiece to 20,000 rpm for polishing to finish faster
C. Correct approach: Apply fluoride varnish with thin even layer after thorough prophylaxis, maintain isolation
for 30-60s, provide post-op instructions to avoid eating for 2 hours and avoid brushing until next day,
document lot number
D. Omit informed consent and HIPAA verification for minor patient
