EFDA Hottel Expanded Functions Dental
Auxiliary Exam Prep Test Bank 2025/2026 | 400
Verified Questions with Correct Answers &
Rationales | Dental Assisting, Dental Hygiene,
CODA, DANB, NBDE
1. An EFDA is preparing to place a composite filling. What is the first step in the
procedure?
(A) Isolate the tooth
(B) Administer local anesthesia
(C) Etch the enamel
(D) Cure the composite
Rationale: Administering local anesthesia is crucial to ensure patient comfort before
any dental procedure begins.
2. During a dental procedure, the EFDA notices the patient is anxious. What is the
best response?
(A) Ignore the patient's anxiety
(B) Reassure the patient and explain the procedure
(C) Speed up the procedure
(D) Suggest the patient leave
Rationale: Reassuring the patient helps alleviate anxiety and builds trust, improving the
overall experience.
3. What is the primary purpose of dental sealants?
(A) Prevent caries
(B) Whiten teeth
(C) Replace fillings
(D) Strengthen enamel
Rationale: Dental sealants are primarily used to prevent cavities by sealing the grooves
in teeth.
4. An EFDA is preparing to use a high-speed handpiece. Which safety precaution is
essential?
(A) Wear protective eyewear
(B) Use a lower speed setting
(C) Skip hand hygiene
(D) Avoid using suction
,Rationale: Protective eyewear is essential to safeguard both the dental team and the
patient from debris and flying particles.
5. What is the ideal time for placing a composite restoration after etching?
(A) 5 minutes
(B) Immediately
(C) 15 minutes
(D) 1 hour
Rationale: Composite material should be placed immediately after etching for optimal
bonding.
6. Which material is commonly used for temporary restorations?
(A) Composite
(B) Glass ionomer
(C) Amalgam
(D) Resin
Rationale: Glass ionomer is often used for temporary restorations due to its ease of use
and ability to bond to the tooth.
7. When applying fluoride varnish, what is the correct application technique?
(A) Apply in a thin, even layer
(B) Use a thick layer
(C) Avoid using a brush
(D) Rub vigorously
Rationale: A thin, even layer ensures effective coverage and absorption without
overwhelming the tooth.
8. An EFDA notices a patient has a high level of plaque accumulation. What should
be the priority action?
(A) Educate the patient on oral hygiene
(B) Schedule a root canal
(C) Place sealants immediately
(D) Ignore the plaque
Rationale: Educating the patient on oral hygiene practices is essential to prevent
further accumulation and dental issues.
9. What is the recommended method for mixing dental cement?
,(A) Stir vigorously
(B) Use a spatula to mix in a circular motion
(C) Mix with water only
(D) Use a handpiece
Rationale: Mixing in a circular motion ensures a homogenous mixture without trapping
air bubbles.
10. During a procedure, the EFDA must ensure proper infection control. Which
action is critical?
(A) Sterilize all instruments
(B) Wear gloves only
(C) Clean the surfaces once a day
(D) Avoid wearing a mask
Rationale: Sterilizing instruments is crucial to prevent cross-contamination and
maintain a safe environment.
11. An EFDA is preparing to take an impression. What material is most commonly
used?
(A) Alginate
(B) Polyvinyl siloxane (PVS)
(C) Wax
(D) Gypsum
Rationale: Polyvinyl siloxane (PVS) is preferred for its accuracy and stability in
impressions.
12. What is the primary role of an EFDA in a dental setting?
(A) Diagnose dental conditions
(B) Assist the dentist and perform expanded functions
(C) Manage patient billing
(D) Conduct research
Rationale: The primary role of an EFDA is to assist the dentist while performing specific
expanded duties within their scope of practice.
13. Which instrument is used for removing decay from a tooth?
(A) Explorer
(B) Excavator
(C) Scaler
, (D) Condenser
Rationale: An excavator is specifically designed for removing decayed tooth material.
14. An EFDA is applying a topical anesthetic. What is the most important
consideration?
(A) Follow manufacturer instructions for application
(B) Apply a thick layer
(C) Use it on every patient regardless of need
(D) Avoid informing the patient
Rationale: Following manufacturer instructions ensures effective and safe application
of the anesthetic.
15. When should an EFDA use a rubber dam?
(A) For all procedures
(B) When performing restorative work
(C) Only for extractions
(D) Never, it’s not necessary
Rationale: A rubber dam is used during restorative work to isolate the tooth and
maintain a dry field.
16. What is the purpose of using a dental matrix?
(A) To provide a temporary wall for restorative materials
(B) To hold the tooth in place
(C) To clean the tooth
(D) To secure the rubber dam
Rationale: A dental matrix provides support for restorative materials, particularly in
class II cavity preparations.
17. An EFDA is instructed to take a radiograph. What is the first step?
(A) Obtain patient consent
(B) Position the patient
(C) Set the machine settings
(D) Develop the film
Rationale: Obtaining patient consent is essential before any radiographic procedure.
18. What is the primary concern when using a high-speed handpiece?
Auxiliary Exam Prep Test Bank 2025/2026 | 400
Verified Questions with Correct Answers &
Rationales | Dental Assisting, Dental Hygiene,
CODA, DANB, NBDE
1. An EFDA is preparing to place a composite filling. What is the first step in the
procedure?
(A) Isolate the tooth
(B) Administer local anesthesia
(C) Etch the enamel
(D) Cure the composite
Rationale: Administering local anesthesia is crucial to ensure patient comfort before
any dental procedure begins.
2. During a dental procedure, the EFDA notices the patient is anxious. What is the
best response?
(A) Ignore the patient's anxiety
(B) Reassure the patient and explain the procedure
(C) Speed up the procedure
(D) Suggest the patient leave
Rationale: Reassuring the patient helps alleviate anxiety and builds trust, improving the
overall experience.
3. What is the primary purpose of dental sealants?
(A) Prevent caries
(B) Whiten teeth
(C) Replace fillings
(D) Strengthen enamel
Rationale: Dental sealants are primarily used to prevent cavities by sealing the grooves
in teeth.
4. An EFDA is preparing to use a high-speed handpiece. Which safety precaution is
essential?
(A) Wear protective eyewear
(B) Use a lower speed setting
(C) Skip hand hygiene
(D) Avoid using suction
,Rationale: Protective eyewear is essential to safeguard both the dental team and the
patient from debris and flying particles.
5. What is the ideal time for placing a composite restoration after etching?
(A) 5 minutes
(B) Immediately
(C) 15 minutes
(D) 1 hour
Rationale: Composite material should be placed immediately after etching for optimal
bonding.
6. Which material is commonly used for temporary restorations?
(A) Composite
(B) Glass ionomer
(C) Amalgam
(D) Resin
Rationale: Glass ionomer is often used for temporary restorations due to its ease of use
and ability to bond to the tooth.
7. When applying fluoride varnish, what is the correct application technique?
(A) Apply in a thin, even layer
(B) Use a thick layer
(C) Avoid using a brush
(D) Rub vigorously
Rationale: A thin, even layer ensures effective coverage and absorption without
overwhelming the tooth.
8. An EFDA notices a patient has a high level of plaque accumulation. What should
be the priority action?
(A) Educate the patient on oral hygiene
(B) Schedule a root canal
(C) Place sealants immediately
(D) Ignore the plaque
Rationale: Educating the patient on oral hygiene practices is essential to prevent
further accumulation and dental issues.
9. What is the recommended method for mixing dental cement?
,(A) Stir vigorously
(B) Use a spatula to mix in a circular motion
(C) Mix with water only
(D) Use a handpiece
Rationale: Mixing in a circular motion ensures a homogenous mixture without trapping
air bubbles.
10. During a procedure, the EFDA must ensure proper infection control. Which
action is critical?
(A) Sterilize all instruments
(B) Wear gloves only
(C) Clean the surfaces once a day
(D) Avoid wearing a mask
Rationale: Sterilizing instruments is crucial to prevent cross-contamination and
maintain a safe environment.
11. An EFDA is preparing to take an impression. What material is most commonly
used?
(A) Alginate
(B) Polyvinyl siloxane (PVS)
(C) Wax
(D) Gypsum
Rationale: Polyvinyl siloxane (PVS) is preferred for its accuracy and stability in
impressions.
12. What is the primary role of an EFDA in a dental setting?
(A) Diagnose dental conditions
(B) Assist the dentist and perform expanded functions
(C) Manage patient billing
(D) Conduct research
Rationale: The primary role of an EFDA is to assist the dentist while performing specific
expanded duties within their scope of practice.
13. Which instrument is used for removing decay from a tooth?
(A) Explorer
(B) Excavator
(C) Scaler
, (D) Condenser
Rationale: An excavator is specifically designed for removing decayed tooth material.
14. An EFDA is applying a topical anesthetic. What is the most important
consideration?
(A) Follow manufacturer instructions for application
(B) Apply a thick layer
(C) Use it on every patient regardless of need
(D) Avoid informing the patient
Rationale: Following manufacturer instructions ensures effective and safe application
of the anesthetic.
15. When should an EFDA use a rubber dam?
(A) For all procedures
(B) When performing restorative work
(C) Only for extractions
(D) Never, it’s not necessary
Rationale: A rubber dam is used during restorative work to isolate the tooth and
maintain a dry field.
16. What is the purpose of using a dental matrix?
(A) To provide a temporary wall for restorative materials
(B) To hold the tooth in place
(C) To clean the tooth
(D) To secure the rubber dam
Rationale: A dental matrix provides support for restorative materials, particularly in
class II cavity preparations.
17. An EFDA is instructed to take a radiograph. What is the first step?
(A) Obtain patient consent
(B) Position the patient
(C) Set the machine settings
(D) Develop the film
Rationale: Obtaining patient consent is essential before any radiographic procedure.
18. What is the primary concern when using a high-speed handpiece?
