NDAEB practice exam DA questions and
Answers with Verified Correct Answers
LATEST UPDATE 2025
A patient presents with swelling and pain in quadrant 1. During the review
of the patient's medical history, it is noted that he has a history of grand mal
seizures. Tooth 1-6 is extremely sensitive to percussion. The surrounding
tissues are inflamed and pus is extruding from a fistula on a buckled
gingival. The dentist prescribes a periapical digital image which reveals a
perforation on a curved root, caused by the failure of a previous endodontic
procedure. To save the tooth, surgery is recommended to which the patient
consents. The presence of pus and swelling of the tissue resulting in
necrosis indicates which of the following conditions.
A. Pulp fibrosis
B. Periodontal abscess
C. Chronic hyperglycemia
D. Acute periridicular abscess - ANSWER-D. Acute periradicular abscess
Which of the following components of a custom tray is created by creating
small voids in wax covering the model?
A. Spacer
B. Handle
C. Outlines
D. Spacer stops - ANSWER-D. Spacer stops
A patient is scheduled in the oral surgeon's office for extractions of tooth 18
and 48. They have insulin-dependent diabetes and have taken the required
medication and food before arriving for this appointment. The patient
appears nervous. When should the removal of the silk sutures following the
surgical extractions occur?
A. 3 days
B. 6 days
C. 9 days
D. 12 days - ANSWER-C. 9 days
,The dental assistant modifies a toothbrushing technique for a patient who
has limited dexterity. Is this
A. Within their scope of practice
B. An act of omission
C. An act of commission - ANSWER-A. Within their scope of practice
The dental assistant places a Pitt and Fisher sealant on the tooth 2-6 when
the treatment was planned on tooth 27. Is this
A. Within their scope of practice
B. Malpractice due to an ethical breach
C. Illegal and outside of their scope of practice - ANSWER-B. Malpractice
due to an ethical breach
A patient presents to the dental office complaining of a toothache. Upon
examination, the dentist asks the dental assistant to take a radiographic
image of tooth 3-6. The dentist reviews the image and noted that they have
decay that appears close to the pulpal chamber. The patient is
unemployed, does not have dental insurance, and wants to keep the tooth.
The preparation includes an interproximal wall which is extended onto the
buccal surface. Which one of the following matrix retainers would be
required to restore the tooth?
A. Straight
B. Sectional
C. Universal
D. Contra angle - ANSWER-D. Contra angle
For a posterior tooth with an interproximal wall and buccal extension, the
best choice is: Contra Angle
An adult patient presents to the dental office for their scheduled root canal
procedure on tooth 4-6. The medical history indicates multiple sclerosis.
The dentist instructs the assistant to set out hand files for the initial
debridement and rotary files to enlarge the walls of the canals. The tooth
will be irrigated and dried before placing a radiopig material to fill the
canals. What chair position would be best for this patient?
A. Supine
B. Upright
C. Sub-Supine
D. Semi-Supine - ANSWER-D. Semi-Supine
,A 16-year-old patient presents to an orthodontic office for an intra-initial
consultation. The following is documented in the patient's record. Past
history of thumb sucking, protrusive maxillary central and lateral incisors,
moderate crowding in the lower anteriors, teeth 75, and 85 are still retained
in the mouth. Alginate impressions and orthodontic records are completed.
The treatment plan is presented to the parents. At a second appointment,
the treatment plan is accepted and appointments are scheduled to begin
treatment.
Which permanent teeth are not present in the patient's mouth?
A. Mandibular first molars
B. Mandibular first premolars
C. Mandibular second molars
D. Mandibular second premolars. - ANSWER-D. Mandibular second
premolars.
The dental assistant tells the patient she has decay onto 35 after
processing the radiographic image.
A, within their scope of practice
B, an act of omission
C, an act of commission - ANSWER-C, an act of commission
What is the best method to prepare a hypersensitive tooth for an
application of sodium fluoride varnish?
A. Apply isopropyl alcohol.
B. Use a microbrush to remove debris.
C. Blot dry the tooth surface with gauze.
D. Apply toothpaste to occlude the dentinal tubules. - ANSWER-C. Blot dry
the tooth surface with gauze.
A 16-year-old patient of record presents for one of his infrequent dental
visits. His health history indicates that he has type 1 diabetes and has a
history of smoking. He complains to the dental assistant that he does not
like to floss as it makes his gum bleed and is painful. During the
examination, the dentist notes the following. Generalized plaque slash
biofilm. Ground surface stains on the lingual of his mandibular anterior
teeth. Slightly swollen gingiva that bleeds to the touch. A full mouth series
of radiographs images has been prescribed.
Which one of the following treatment options would be appropriate for this
patient?
A. Rinse with chlorhexidine and recall visit every 6 months.
, B. Selective polish and recall visit every 6 months.
C. Fluoride treatment every 6 months.
D. Propylaxis and recall visit every 6 months. - ANSWER-D. Propylaxis and
recall visit every 6 months.
When is the best time to start brushing primary teeth?
A. Begin at birth.
B. When the first tooth appears.
C. Starting to eat solid foods.
D. When baby stops using the bottle. - ANSWER-B. When the first tooth
appears.
Match the following infection methods with laboratory equipment. Plastic
Flexible Alginate Spatula
A. autoclave
B. phenolics
C. alcohol
D. sodium hypochlorite - ANSWER-B. phenolics
Phenolics are commonly used as chemical disinfectants for non-critical
dental instruments like plastic spatulas.
On which arteries should the stethoscope be placed when taking blood
pressure?
A. Radial
B. Arterial
C. Brachial
D. Femoral - ANSWER-C. Brachial
A patient presents for composite restorations on the following teeth
surfaces. 21, DI, 11, MID, and 44, DO. The dental assistant prepares the
equipment and supplies and applies a topical anesthetic as prescribed by
the dentist. After the treatment is completed, the patient begins to have
intermittent blinking followed by a blank stare.
Which one of the following matrices should be used on the premolar?
A, extension band
B, mylar strip
C, pedo band
D, sectional - ANSWER-D, sectional
The amount paid before benefits take effect.
Answers with Verified Correct Answers
LATEST UPDATE 2025
A patient presents with swelling and pain in quadrant 1. During the review
of the patient's medical history, it is noted that he has a history of grand mal
seizures. Tooth 1-6 is extremely sensitive to percussion. The surrounding
tissues are inflamed and pus is extruding from a fistula on a buckled
gingival. The dentist prescribes a periapical digital image which reveals a
perforation on a curved root, caused by the failure of a previous endodontic
procedure. To save the tooth, surgery is recommended to which the patient
consents. The presence of pus and swelling of the tissue resulting in
necrosis indicates which of the following conditions.
A. Pulp fibrosis
B. Periodontal abscess
C. Chronic hyperglycemia
D. Acute periridicular abscess - ANSWER-D. Acute periradicular abscess
Which of the following components of a custom tray is created by creating
small voids in wax covering the model?
A. Spacer
B. Handle
C. Outlines
D. Spacer stops - ANSWER-D. Spacer stops
A patient is scheduled in the oral surgeon's office for extractions of tooth 18
and 48. They have insulin-dependent diabetes and have taken the required
medication and food before arriving for this appointment. The patient
appears nervous. When should the removal of the silk sutures following the
surgical extractions occur?
A. 3 days
B. 6 days
C. 9 days
D. 12 days - ANSWER-C. 9 days
,The dental assistant modifies a toothbrushing technique for a patient who
has limited dexterity. Is this
A. Within their scope of practice
B. An act of omission
C. An act of commission - ANSWER-A. Within their scope of practice
The dental assistant places a Pitt and Fisher sealant on the tooth 2-6 when
the treatment was planned on tooth 27. Is this
A. Within their scope of practice
B. Malpractice due to an ethical breach
C. Illegal and outside of their scope of practice - ANSWER-B. Malpractice
due to an ethical breach
A patient presents to the dental office complaining of a toothache. Upon
examination, the dentist asks the dental assistant to take a radiographic
image of tooth 3-6. The dentist reviews the image and noted that they have
decay that appears close to the pulpal chamber. The patient is
unemployed, does not have dental insurance, and wants to keep the tooth.
The preparation includes an interproximal wall which is extended onto the
buccal surface. Which one of the following matrix retainers would be
required to restore the tooth?
A. Straight
B. Sectional
C. Universal
D. Contra angle - ANSWER-D. Contra angle
For a posterior tooth with an interproximal wall and buccal extension, the
best choice is: Contra Angle
An adult patient presents to the dental office for their scheduled root canal
procedure on tooth 4-6. The medical history indicates multiple sclerosis.
The dentist instructs the assistant to set out hand files for the initial
debridement and rotary files to enlarge the walls of the canals. The tooth
will be irrigated and dried before placing a radiopig material to fill the
canals. What chair position would be best for this patient?
A. Supine
B. Upright
C. Sub-Supine
D. Semi-Supine - ANSWER-D. Semi-Supine
,A 16-year-old patient presents to an orthodontic office for an intra-initial
consultation. The following is documented in the patient's record. Past
history of thumb sucking, protrusive maxillary central and lateral incisors,
moderate crowding in the lower anteriors, teeth 75, and 85 are still retained
in the mouth. Alginate impressions and orthodontic records are completed.
The treatment plan is presented to the parents. At a second appointment,
the treatment plan is accepted and appointments are scheduled to begin
treatment.
Which permanent teeth are not present in the patient's mouth?
A. Mandibular first molars
B. Mandibular first premolars
C. Mandibular second molars
D. Mandibular second premolars. - ANSWER-D. Mandibular second
premolars.
The dental assistant tells the patient she has decay onto 35 after
processing the radiographic image.
A, within their scope of practice
B, an act of omission
C, an act of commission - ANSWER-C, an act of commission
What is the best method to prepare a hypersensitive tooth for an
application of sodium fluoride varnish?
A. Apply isopropyl alcohol.
B. Use a microbrush to remove debris.
C. Blot dry the tooth surface with gauze.
D. Apply toothpaste to occlude the dentinal tubules. - ANSWER-C. Blot dry
the tooth surface with gauze.
A 16-year-old patient of record presents for one of his infrequent dental
visits. His health history indicates that he has type 1 diabetes and has a
history of smoking. He complains to the dental assistant that he does not
like to floss as it makes his gum bleed and is painful. During the
examination, the dentist notes the following. Generalized plaque slash
biofilm. Ground surface stains on the lingual of his mandibular anterior
teeth. Slightly swollen gingiva that bleeds to the touch. A full mouth series
of radiographs images has been prescribed.
Which one of the following treatment options would be appropriate for this
patient?
A. Rinse with chlorhexidine and recall visit every 6 months.
, B. Selective polish and recall visit every 6 months.
C. Fluoride treatment every 6 months.
D. Propylaxis and recall visit every 6 months. - ANSWER-D. Propylaxis and
recall visit every 6 months.
When is the best time to start brushing primary teeth?
A. Begin at birth.
B. When the first tooth appears.
C. Starting to eat solid foods.
D. When baby stops using the bottle. - ANSWER-B. When the first tooth
appears.
Match the following infection methods with laboratory equipment. Plastic
Flexible Alginate Spatula
A. autoclave
B. phenolics
C. alcohol
D. sodium hypochlorite - ANSWER-B. phenolics
Phenolics are commonly used as chemical disinfectants for non-critical
dental instruments like plastic spatulas.
On which arteries should the stethoscope be placed when taking blood
pressure?
A. Radial
B. Arterial
C. Brachial
D. Femoral - ANSWER-C. Brachial
A patient presents for composite restorations on the following teeth
surfaces. 21, DI, 11, MID, and 44, DO. The dental assistant prepares the
equipment and supplies and applies a topical anesthetic as prescribed by
the dentist. After the treatment is completed, the patient begins to have
intermittent blinking followed by a blank stare.
Which one of the following matrices should be used on the premolar?
A, extension band
B, mylar strip
C, pedo band
D, sectional - ANSWER-D, sectional
The amount paid before benefits take effect.
