NDEAB Practice Exam DA 2025 With
100% Correct Answers
Prior to exposing a dental radiograph/image, placement of the lead apron over the patient
protects which one of the following tissues? - CORRECT ANSWER✔✔Gonadal
Which three factors are essential in order to produce accurate diagnostic casts? - CORRECT
ANSWER✔✔Water to powder ratio, mixing time and water temperature.
What is the correct way to store scrap amalgam? - CORRECT ANSWER✔✔In a tightly closed
mercury recycling container
In a steam sterilizer, the distilled water is converted to steam then condensed back into liquid
water. What happens to the condensed water? - CORRECT ANSWER✔✔It is drained from the
sterilizer and discarded down the drain in the sink.
A patient presents to the dental office with concerns about sensitivity on a lower canine tooth.
The dentist performs an examination and diagnoses gingival recession and abrasion on the
facial root surface of tooth 33. The patient has 100% dental insurance
coverage for diagnostic, preventive and restorative services.
What is the etiology of the sensitivity? - CORRECT ANSWER✔✔Exposed dentinal tubules
A 24-year-old patient presents for an emergency exam.
During the interview it is noted that he is a heavy smoker and has been under a
great deal of emotional stress. The clinical examination findings are: a biofilm index of 3 with
some ulceration of interdental papillae.
,What
is the recommended treatment for this patient? - CORRECT ANSWER✔✔Debridement, careful
brushing at home, warm water rinses
A 75-year-old patient presents at the dental office with a fractured tooth 46. While reviewing
the medical history, the dental assistant notes that the patient has rheumatoid arthritis and
type II diabetes. The clinical examination also reveals generalized gingival recession, cervical
tooth abrasion and several root caries.
Which one of the following tooth brushing techniques should be recommended for this
patient? - CORRECT ANSWER✔✔Rolling stroke.
A patient presents for a bridge preparation. The dentist administers the local anesthetic then
the dental assistant takes an alginate impression of the lower left quadrant. Teeth 36 and 37 are
missing and tooth 38 has drifted into the 37 position. The bridge will go from tooth 35 to tooth
38.
The insurance plan provides 80% reimbursement for this type of treatment.
What will the alginate impression be used for? - CORRECT ANSWER✔✔As a matrix for the
provisional
A patient presents for an emergency examination of tooth 16. The tooth has been sensitive to
pressure for several weeks and the patient indicates that it is getting worse. The dentist does an
intra-oral examination and prescribes a direct digital periapical radiograph of the area. The
dental assistant is directed to assemble equipment and supplies for pulp vitality testing.
Which one of the following teeth would be best as the control tooth for the pulp
vitality test? - CORRECT ANSWER✔✔26
A patient presents for an emergency examination of tooth 16. The tooth has been sensitive to
pressure for several weeks and the patient indicates that it is getting worse. The dentist does an
intra-oral examination and prescribes a direct digital periapical radiograph of the area. The
dental assistant is directed to assemble equipment and supplies for pulp vitality testing.
,The cold test for the tooth causes an intense pain that does not resolve for a few minutes. What
diagnosis is most probable? - CORRECT ANSWER✔✔Irreversible pulpitis.
A dental assistant must be able to self-correct errors made during dental dam punching and
placement. From the list of errors below, choose the one that best matches the scenario given
in the item.
Bunching and stretching on lingual of dam when placed - CORRECT ANSWER✔✔Arch is punched
too flat.
A mother of a 5-month-old infant ask the dental assistant which of her daughter's teeth will fall
out first. What is the most accurate response?
1. Her upper two teeth, the frontal incisors
2. Her bottom two teeth, the central incisors
3. Her two canine teeth will fall out first
4. Her primary molars - CORRECT ANSWER✔✔2. Her bottom two teeth, the central incisors
Which of the following produces about 60% of the total amount of saliva?
1. Sublingual gland
2. Parotid gland
3. Submandibular glands
4. None of the options - CORRECT ANSWER✔✔3. Submandibular glands
Which of the following muscles of the mouth floor raises the hyoid bone to assist in swallowing?
1. Digastric
, 2. Stylohyoid
3. Geniohyoid
4. Mylohyoid - CORRECT ANSWER✔✔2. Stylohyoid
This instrument is used to prepare the tooth and plane the walls and floors of the tooth
preparation with a push-pull action:
1. Spatula
2. Condensers
3. Hatchet
4. Hoe - CORRECT ANSWER✔✔4. Hoe
What handpiece would be used for the removal of bonding materials from a tooth surface after
orthodontic appliances are removed?
1. Air abrasion handpiece
2. Laboratory handpiece
3. Ultrasonic handpiece
4. Laser handpiece - CORRECT ANSWER✔✔3. Ultrasonic handpiece
If a patient's anterior teeth are positioned too far back on the bite-block, these teeth will appear
out of focus on the radiograph. What would be the solution for this?
1. Instruct the patient to stand as tall as possible with a straight back
2. Position the patient so that the anterior teeth are placed in an end-to-end position in the
groove on the bite-block
3. Position the patient so that the Frankfort plane is parallel to the floor
100% Correct Answers
Prior to exposing a dental radiograph/image, placement of the lead apron over the patient
protects which one of the following tissues? - CORRECT ANSWER✔✔Gonadal
Which three factors are essential in order to produce accurate diagnostic casts? - CORRECT
ANSWER✔✔Water to powder ratio, mixing time and water temperature.
What is the correct way to store scrap amalgam? - CORRECT ANSWER✔✔In a tightly closed
mercury recycling container
In a steam sterilizer, the distilled water is converted to steam then condensed back into liquid
water. What happens to the condensed water? - CORRECT ANSWER✔✔It is drained from the
sterilizer and discarded down the drain in the sink.
A patient presents to the dental office with concerns about sensitivity on a lower canine tooth.
The dentist performs an examination and diagnoses gingival recession and abrasion on the
facial root surface of tooth 33. The patient has 100% dental insurance
coverage for diagnostic, preventive and restorative services.
What is the etiology of the sensitivity? - CORRECT ANSWER✔✔Exposed dentinal tubules
A 24-year-old patient presents for an emergency exam.
During the interview it is noted that he is a heavy smoker and has been under a
great deal of emotional stress. The clinical examination findings are: a biofilm index of 3 with
some ulceration of interdental papillae.
,What
is the recommended treatment for this patient? - CORRECT ANSWER✔✔Debridement, careful
brushing at home, warm water rinses
A 75-year-old patient presents at the dental office with a fractured tooth 46. While reviewing
the medical history, the dental assistant notes that the patient has rheumatoid arthritis and
type II diabetes. The clinical examination also reveals generalized gingival recession, cervical
tooth abrasion and several root caries.
Which one of the following tooth brushing techniques should be recommended for this
patient? - CORRECT ANSWER✔✔Rolling stroke.
A patient presents for a bridge preparation. The dentist administers the local anesthetic then
the dental assistant takes an alginate impression of the lower left quadrant. Teeth 36 and 37 are
missing and tooth 38 has drifted into the 37 position. The bridge will go from tooth 35 to tooth
38.
The insurance plan provides 80% reimbursement for this type of treatment.
What will the alginate impression be used for? - CORRECT ANSWER✔✔As a matrix for the
provisional
A patient presents for an emergency examination of tooth 16. The tooth has been sensitive to
pressure for several weeks and the patient indicates that it is getting worse. The dentist does an
intra-oral examination and prescribes a direct digital periapical radiograph of the area. The
dental assistant is directed to assemble equipment and supplies for pulp vitality testing.
Which one of the following teeth would be best as the control tooth for the pulp
vitality test? - CORRECT ANSWER✔✔26
A patient presents for an emergency examination of tooth 16. The tooth has been sensitive to
pressure for several weeks and the patient indicates that it is getting worse. The dentist does an
intra-oral examination and prescribes a direct digital periapical radiograph of the area. The
dental assistant is directed to assemble equipment and supplies for pulp vitality testing.
,The cold test for the tooth causes an intense pain that does not resolve for a few minutes. What
diagnosis is most probable? - CORRECT ANSWER✔✔Irreversible pulpitis.
A dental assistant must be able to self-correct errors made during dental dam punching and
placement. From the list of errors below, choose the one that best matches the scenario given
in the item.
Bunching and stretching on lingual of dam when placed - CORRECT ANSWER✔✔Arch is punched
too flat.
A mother of a 5-month-old infant ask the dental assistant which of her daughter's teeth will fall
out first. What is the most accurate response?
1. Her upper two teeth, the frontal incisors
2. Her bottom two teeth, the central incisors
3. Her two canine teeth will fall out first
4. Her primary molars - CORRECT ANSWER✔✔2. Her bottom two teeth, the central incisors
Which of the following produces about 60% of the total amount of saliva?
1. Sublingual gland
2. Parotid gland
3. Submandibular glands
4. None of the options - CORRECT ANSWER✔✔3. Submandibular glands
Which of the following muscles of the mouth floor raises the hyoid bone to assist in swallowing?
1. Digastric
, 2. Stylohyoid
3. Geniohyoid
4. Mylohyoid - CORRECT ANSWER✔✔2. Stylohyoid
This instrument is used to prepare the tooth and plane the walls and floors of the tooth
preparation with a push-pull action:
1. Spatula
2. Condensers
3. Hatchet
4. Hoe - CORRECT ANSWER✔✔4. Hoe
What handpiece would be used for the removal of bonding materials from a tooth surface after
orthodontic appliances are removed?
1. Air abrasion handpiece
2. Laboratory handpiece
3. Ultrasonic handpiece
4. Laser handpiece - CORRECT ANSWER✔✔3. Ultrasonic handpiece
If a patient's anterior teeth are positioned too far back on the bite-block, these teeth will appear
out of focus on the radiograph. What would be the solution for this?
1. Instruct the patient to stand as tall as possible with a straight back
2. Position the patient so that the anterior teeth are placed in an end-to-end position in the
groove on the bite-block
3. Position the patient so that the Frankfort plane is parallel to the floor
