NBDE Part 2 Endo Questions And 100% Correct Answers
During a root canal treatment, a dentist separates a file 1 mm short of the apex. The
operator is unable to retrieve the file. Which of the following treatments is indicated to
manage such an occurrence after the dentist finished the root canal treatment?
A. Amputate the MB root.
B. Extract the tooth.
C. Perform an apicoectomy of the MB root.
D. Place patient on recall schedule for further evaluation. - ANSWER D
A patient has severe pain and presents an acute periapical abscess of tooth #3 that
started three days ago. Besides the emergency access opening to relieve pressure,
which of the following also must be completed at the same appointment to assist the
active infection control?
A. Occlusion adjustment
B. Placing antimicrobial medicaments within the pulp space
C. Debriding the canal system of necrotic tissues
D. Administering analgesics - ANSWER C
Which of the following is the best treatment sequence for a case where an 8-year-old
traumatized their maxillary central incisor by slipping and falling in the bathroom at the
restaurant next door and then came over. Upon evaluating the fracture you observe a
3mm opening to the pulp.
A. Apicoectomy
B. Apexification
C. Apexogenesis
D. Indirect pulp cap
E. Direct pulp cap - ANSWER C
,Which of the following describes the orifice location of the 4th canal common to tooth
#3?
A. Distal to the palatal canal in patients from the Pacific Islands
B. On a line on the pulpal floor from the distobuccal orifice to the mesiobuccal orifice
C. On a line on the pulpal floor from the palatal orifice to the distobuccal orifice
D. Palatal to the orifice of the mesiobuccal canal
E. Directly under the distobuccal cusp - ANSWER D
If an endodontist has made a triangular access opening when preparing the tooth for a
root canal, this person probably has opened which of the following teeth?
A. Mandibular 2nd premolar
B. Maxillary central incisor
C. Maxillary canine
D. Mandibular canine - ANSWER B
A 42-year-old patient is referred to your office following a bike accident. The maxillary
central incisor of the patient is traumatized and slightly tender to percussion. The tooth
does not appear to be intruded and it responds normally to pulp vitality tests. On
radiographic examination, you identify a horizontal fracture on the apical third of the
root. Which of the following is the treatment of choice?
A. Splint and reevaluation of the tooth for pulpal vitality at later time
B. Apicoectomy to remove the fractured apical section of the root followed by root canal
treatment
,C. Apexification and subsequent root canal therapy
D. Root canal treatment - ANSWER A
Which of the following is the best management of a tooth with a periapical radiolucency
that is smaller than it was when the root canal was performed six months ago?
A. Recall of the patient in six months
B. Apicoectomy
C. Extraction
D. Non-surgical retreatment
E. Root amputation - ANSWER A
Which of the following clinical findings immediately after tooth trauma is least
informative with respect to the determination of the prognosis of the tooth?
A. Displacement of teeth
B. Loss of tooth structure
C. Tooth vitality
D. Tooth mobility - ANSWER C
Trauma to a tooth can result in calcific metamorphosis of the pulp chamber, because
trauma can stimulate odontoclasts to become active.
A. Both statement and reason are correct and related.
B. Both statement and reason are correct but NOT related.
C. The statement is correct, but the reason is NOT.
D. The statement is NOT correct, but the reason is correct.
, E. NEITHER the statement NOR the reason is correct. - ANSWER B
Which of the following has the most influence on the outcome of a pulpotomy on a
primary molar?
A. Patient's age
B. G. V. Black classification of coronal caries
C. Lack of root resorption
D. Tooth pulp vitality - ANSWER D
While instrumenting the mesial root of tooth #19, which of the following canal wall is
most likely to become strip perforated?
A. Mesial
B. Lingual
C. Buccal
D. Distal - ANSWER D
Which of the following is most critical for the disinfection of a root canal?
A. Use of ethylenediaminetetraacetic acid (EDTA) before obturation of the canals
During a root canal treatment, a dentist separates a file 1 mm short of the apex. The
operator is unable to retrieve the file. Which of the following treatments is indicated to
manage such an occurrence after the dentist finished the root canal treatment?
A. Amputate the MB root.
B. Extract the tooth.
C. Perform an apicoectomy of the MB root.
D. Place patient on recall schedule for further evaluation. - ANSWER D
A patient has severe pain and presents an acute periapical abscess of tooth #3 that
started three days ago. Besides the emergency access opening to relieve pressure,
which of the following also must be completed at the same appointment to assist the
active infection control?
A. Occlusion adjustment
B. Placing antimicrobial medicaments within the pulp space
C. Debriding the canal system of necrotic tissues
D. Administering analgesics - ANSWER C
Which of the following is the best treatment sequence for a case where an 8-year-old
traumatized their maxillary central incisor by slipping and falling in the bathroom at the
restaurant next door and then came over. Upon evaluating the fracture you observe a
3mm opening to the pulp.
A. Apicoectomy
B. Apexification
C. Apexogenesis
D. Indirect pulp cap
E. Direct pulp cap - ANSWER C
,Which of the following describes the orifice location of the 4th canal common to tooth
#3?
A. Distal to the palatal canal in patients from the Pacific Islands
B. On a line on the pulpal floor from the distobuccal orifice to the mesiobuccal orifice
C. On a line on the pulpal floor from the palatal orifice to the distobuccal orifice
D. Palatal to the orifice of the mesiobuccal canal
E. Directly under the distobuccal cusp - ANSWER D
If an endodontist has made a triangular access opening when preparing the tooth for a
root canal, this person probably has opened which of the following teeth?
A. Mandibular 2nd premolar
B. Maxillary central incisor
C. Maxillary canine
D. Mandibular canine - ANSWER B
A 42-year-old patient is referred to your office following a bike accident. The maxillary
central incisor of the patient is traumatized and slightly tender to percussion. The tooth
does not appear to be intruded and it responds normally to pulp vitality tests. On
radiographic examination, you identify a horizontal fracture on the apical third of the
root. Which of the following is the treatment of choice?
A. Splint and reevaluation of the tooth for pulpal vitality at later time
B. Apicoectomy to remove the fractured apical section of the root followed by root canal
treatment
,C. Apexification and subsequent root canal therapy
D. Root canal treatment - ANSWER A
Which of the following is the best management of a tooth with a periapical radiolucency
that is smaller than it was when the root canal was performed six months ago?
A. Recall of the patient in six months
B. Apicoectomy
C. Extraction
D. Non-surgical retreatment
E. Root amputation - ANSWER A
Which of the following clinical findings immediately after tooth trauma is least
informative with respect to the determination of the prognosis of the tooth?
A. Displacement of teeth
B. Loss of tooth structure
C. Tooth vitality
D. Tooth mobility - ANSWER C
Trauma to a tooth can result in calcific metamorphosis of the pulp chamber, because
trauma can stimulate odontoclasts to become active.
A. Both statement and reason are correct and related.
B. Both statement and reason are correct but NOT related.
C. The statement is correct, but the reason is NOT.
D. The statement is NOT correct, but the reason is correct.
, E. NEITHER the statement NOR the reason is correct. - ANSWER B
Which of the following has the most influence on the outcome of a pulpotomy on a
primary molar?
A. Patient's age
B. G. V. Black classification of coronal caries
C. Lack of root resorption
D. Tooth pulp vitality - ANSWER D
While instrumenting the mesial root of tooth #19, which of the following canal wall is
most likely to become strip perforated?
A. Mesial
B. Lingual
C. Buccal
D. Distal - ANSWER D
Which of the following is most critical for the disinfection of a root canal?
A. Use of ethylenediaminetetraacetic acid (EDTA) before obturation of the canals
