Endo NBDE Questions 1989 UPDATED ACTUAL Questions
and CORRECT Answers
The most frequent cause of failure in endodontics is C
A. split roots.
B. root perforation.
C. incomplete obturation.
D. separated instruments.
E. filling beyond the apex.
A patient of record calls late Saturday night because of B
severe, throbbing pain aggravated by "heat, biting and
touching" in a mandibular premolar. What procedure is
recommended?
A. Instruct the patient to apply ice intermittently, take
aspirin, and call Monday for an appointment.
B. See the patient at the office and initiate endodontic
treatment.
C. See the patient at the office, remove the carious dentin
and place a sedative zinc oxide-eugenol cement.
D. Prescribe an analgesic and refer the patient to an
endodontist.
E. Refer the patient to the hospital oral surgery
department for extraction.
Overfilling may force filling materials directly into the B
maxillary sinus most frequently in the case of a
maxillary canine.
maxillary second premolar.
maxillary lateral incisor.
facial root of a maxillary first premolar.
palatal root of a maxillary first premolar.
On a radiograph, the facial root of a maxillary first D
premolar would appear distal to the lingual root if the
(SLOB. Use two pens!)
A. vertical angle of the cone were increased.
B. vertical angle of the cone were decreased.
C. x-ray head were angled from a distal position relative
to the premolar.
D. x-ray head were angled from a mesial position (mesial
angulation. From mesial to distal) relative to the premolar.
, Compared with use of an autoclave, use of a dry heat A
oven for sterilizing has the disadvantage of
A. being time-consuming.
B. being less effective.
C. causing instruments to rust.
D. causing sharp instruments to dull.
The most likely interpretation for the radiolucent area at D
the apex of the pin-restored maxillary central incisor
pictured in the radiograph is
A. the nasal fossa.
B. a nasoalveolar cyst.
C. a nasopalatine duct cyst.
D. chronic apical periodontitis.
E. the foramen of the incisive canal.
A patient has a history of a large carious lesion in a C
mandibular right molar, a severe toothache arising from
the tooth, submandibular facial swelling on the right side,
and a fever of 102.5 degrees Fahrenheit. This condition
progressed over the next few weeks to include
continuous purulent exudation through the gingival
sulcus, right submaxillary lymphadenopathy, a constant
fever of 100 degrees Fahrenheit, and a diffuse, "moth-
eaten" radiolucent appearance of the posterior right side
of the mandible. The most probable diagnosis is
A. histiocytosis.
B. Paget's disease.
C. acute osteomyelitis.
D. acute apical abscess.
E. chronic apical periodontitis.
Approximately what per cent of mandibular first molars C
exhibit two distal canals?
A. 0 %
B. 10 %
C. 30 %
D. 60 %
E. 75 %
Prognosis of a tooth with a broken instrument located 3 B
mm. from the apex is probably best if the tooth has a
A. vital pulp with a periapical lesion.
B. vital pulp without a periapical lesion.
C. necrotic pulp with a periapical lesion.
D. necrotic pulp without a periapical lesion.
and CORRECT Answers
The most frequent cause of failure in endodontics is C
A. split roots.
B. root perforation.
C. incomplete obturation.
D. separated instruments.
E. filling beyond the apex.
A patient of record calls late Saturday night because of B
severe, throbbing pain aggravated by "heat, biting and
touching" in a mandibular premolar. What procedure is
recommended?
A. Instruct the patient to apply ice intermittently, take
aspirin, and call Monday for an appointment.
B. See the patient at the office and initiate endodontic
treatment.
C. See the patient at the office, remove the carious dentin
and place a sedative zinc oxide-eugenol cement.
D. Prescribe an analgesic and refer the patient to an
endodontist.
E. Refer the patient to the hospital oral surgery
department for extraction.
Overfilling may force filling materials directly into the B
maxillary sinus most frequently in the case of a
maxillary canine.
maxillary second premolar.
maxillary lateral incisor.
facial root of a maxillary first premolar.
palatal root of a maxillary first premolar.
On a radiograph, the facial root of a maxillary first D
premolar would appear distal to the lingual root if the
(SLOB. Use two pens!)
A. vertical angle of the cone were increased.
B. vertical angle of the cone were decreased.
C. x-ray head were angled from a distal position relative
to the premolar.
D. x-ray head were angled from a mesial position (mesial
angulation. From mesial to distal) relative to the premolar.
, Compared with use of an autoclave, use of a dry heat A
oven for sterilizing has the disadvantage of
A. being time-consuming.
B. being less effective.
C. causing instruments to rust.
D. causing sharp instruments to dull.
The most likely interpretation for the radiolucent area at D
the apex of the pin-restored maxillary central incisor
pictured in the radiograph is
A. the nasal fossa.
B. a nasoalveolar cyst.
C. a nasopalatine duct cyst.
D. chronic apical periodontitis.
E. the foramen of the incisive canal.
A patient has a history of a large carious lesion in a C
mandibular right molar, a severe toothache arising from
the tooth, submandibular facial swelling on the right side,
and a fever of 102.5 degrees Fahrenheit. This condition
progressed over the next few weeks to include
continuous purulent exudation through the gingival
sulcus, right submaxillary lymphadenopathy, a constant
fever of 100 degrees Fahrenheit, and a diffuse, "moth-
eaten" radiolucent appearance of the posterior right side
of the mandible. The most probable diagnosis is
A. histiocytosis.
B. Paget's disease.
C. acute osteomyelitis.
D. acute apical abscess.
E. chronic apical periodontitis.
Approximately what per cent of mandibular first molars C
exhibit two distal canals?
A. 0 %
B. 10 %
C. 30 %
D. 60 %
E. 75 %
Prognosis of a tooth with a broken instrument located 3 B
mm. from the apex is probably best if the tooth has a
A. vital pulp with a periapical lesion.
B. vital pulp without a periapical lesion.
C. necrotic pulp with a periapical lesion.
D. necrotic pulp without a periapical lesion.
