NBDE Part 2 Endo UPDATED ACTUAL
Exam Questions and CORRECT Answers
While performing a root canal, a dentist separates a file 1 mm short of the apex. The file cannot
be removed by the operator. Which of the following treatments is indicated for managing such as
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 the patient on recall schedule for further evaluation. - CORRECT ANSWER -D
A patient presents with severe pain and an acute periapical abscess on tooth #3 that has been
present for the last three days. Along with performing an emergency access opening to relieve
the pressure, which of the following must also be performed during the same appointment to help
control the active infection?
A. Adjusting occlusion
B. Introducing antimicrobial medicaments into the pulp space
C. Debriding the canal system of necrotic tissues
D. Prescribing analgesics - CORRECT ANSWER -C
Which of the following describes the best treatment option for an 8-year-old patient who
fractured their maxillary central incisor after they slipped and fell in the bathroom at the
restaurant next door and came over afterwards? As you examine the fracture, you notice a 3mm
opening into the pulp.
A. Apicoectomy
B. Apexification
C. Apexogenesis
D. Indirect pulp cap
E. Direct pulp cap - CORRECT 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 - CORRECT ANSWER -D
If an endodontist has created a triangular access opening when performing a root canal, they
have likely opened which of the following teeth?
A. Mandibular 2nd premolar
B. Maxillary central incisor
C. Maxillary canine
D. Mandibular canine - CORRECT ANSWER -B
A 42-year-old patient reports to your office after a bike accident. The patient's maxillary central
incisor is traumatized and slightly tender to percussion. The tooth does not appear intruded and
responds normally to pulp vitality tests. Radiographic examination reveals 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 - CORRECT 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 - CORRECT ANSWER -A
Immediately after tooth trauma, which of the following clinical findings is least informative for
determining the prognosis of the tooth?
A. Displacement of teeth
B. Loss of tooth structure
C. Tooth vitality
D. Tooth mobility - CORRECT ANSWER -C
Trauma to a tooth can cause the pulp chamber to undergo calcific metamorphosis, because
trauma can induce odontoclasts to activate.
A. Both the statement and the reason are correct and related.
, B. Both the statement and the 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. - CORRECT ANSWER -B
Which of the following has the greatest impact on the success of a pulpotomy performed on a
primary molar?
A. Age of the patient
B. G. V. Black classification of coronal caries
C. Absence of root resorption
D. Vitality of the tooth pulp - CORRECT ANSWER -D
When instrumenting the mesial root of tooth #19, which of the following canal surfaces is the
most likely to become strip perforated?
A. Mesial
B. Lingual
C. Buccal
Exam Questions and CORRECT Answers
While performing a root canal, a dentist separates a file 1 mm short of the apex. The file cannot
be removed by the operator. Which of the following treatments is indicated for managing such as
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 the patient on recall schedule for further evaluation. - CORRECT ANSWER -D
A patient presents with severe pain and an acute periapical abscess on tooth #3 that has been
present for the last three days. Along with performing an emergency access opening to relieve
the pressure, which of the following must also be performed during the same appointment to help
control the active infection?
A. Adjusting occlusion
B. Introducing antimicrobial medicaments into the pulp space
C. Debriding the canal system of necrotic tissues
D. Prescribing analgesics - CORRECT ANSWER -C
Which of the following describes the best treatment option for an 8-year-old patient who
fractured their maxillary central incisor after they slipped and fell in the bathroom at the
restaurant next door and came over afterwards? As you examine the fracture, you notice a 3mm
opening into the pulp.
A. Apicoectomy
B. Apexification
C. Apexogenesis
D. Indirect pulp cap
E. Direct pulp cap - CORRECT 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 - CORRECT ANSWER -D
If an endodontist has created a triangular access opening when performing a root canal, they
have likely opened which of the following teeth?
A. Mandibular 2nd premolar
B. Maxillary central incisor
C. Maxillary canine
D. Mandibular canine - CORRECT ANSWER -B
A 42-year-old patient reports to your office after a bike accident. The patient's maxillary central
incisor is traumatized and slightly tender to percussion. The tooth does not appear intruded and
responds normally to pulp vitality tests. Radiographic examination reveals 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 - CORRECT 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 - CORRECT ANSWER -A
Immediately after tooth trauma, which of the following clinical findings is least informative for
determining the prognosis of the tooth?
A. Displacement of teeth
B. Loss of tooth structure
C. Tooth vitality
D. Tooth mobility - CORRECT ANSWER -C
Trauma to a tooth can cause the pulp chamber to undergo calcific metamorphosis, because
trauma can induce odontoclasts to activate.
A. Both the statement and the reason are correct and related.
, B. Both the statement and the 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. - CORRECT ANSWER -B
Which of the following has the greatest impact on the success of a pulpotomy performed on a
primary molar?
A. Age of the patient
B. G. V. Black classification of coronal caries
C. Absence of root resorption
D. Vitality of the tooth pulp - CORRECT ANSWER -D
When instrumenting the mesial root of tooth #19, which of the following canal surfaces is the
most likely to become strip perforated?
A. Mesial
B. Lingual
C. Buccal
