Endo NBDE II UPDATED ACTUAL Questions and CORRECT
Answers
Each of the following are true regarding the treatment Antibiotics are indicated
tooth with a sinus tract EXCEPT one. Which is the
EXCEPTION?
a) Antibiotics are indicated
b) The tooth should be treated with a root canal
c) Root-end surgery should be performed if the tract
persists after the root-canal
d) The sinus tract should heal within a month of the root
canal
2. Which of the following is the MOST LIKELY adverse b) External cervical root resorption
effect of internally bleaching an endodontically treated
tooth with superoxide?
a) Demineralizeation of tooth structure
b) External cervical root resorption
c) Reinfection of the canal
d) Weakening of the remaining tooth structure
3. Each of the following is true regarding pins EXCEPT a) Pins strengthen amalgam restorations
one. Which is the EXCEPTION?
a) Pins strengthen amalgam restorations
b) Pins should not be bent
c) Pins should be placed 1mm from the DEJ
d) Pins should be placed 2mm into the amalgam
4. Each of the following statements about post a) Posts reinforce the tooth structure and prevent vertical root fractures
preparation is CORRECT EXCEPT one. Which is the
EXCEPTION?
a) Posts reinforce the tooth structure and prevent vertical
root fractures
b) Posts are indicated when there is inadequate coronal
tooth structure for fixed restorations
c) Posts retain the core for teeth with extensive coronal
tooth structure loss
d) It is recommended that at least 5mm of gutta percha
should remain in the root canal after the post space is
prepared
5. Which of the following materials is typically used for a) Sodium perborate
the walking bleach technique?
a) Sodium Perborate
b) 30% Hydrogen peroxide
c) 30% Carbamide peroxide
d) 2.6% Sodium Hypochlorite
e) 10% Phosphoric acid
f) 14% Carbamide peroxide
,6. The prognosis for internal bleaching is best if the c) Necrotic pulp tissue
etiology of the stain is...
a) Precipitation of metallic salts
b) Silver-containing root canal sealers
c) Necrotic pulp tissue
d) Amalgam restorations
7. When restoring an endodontically treated tooth with c) 3 mm
amalgam, what depth into each root canal should be
achieved to obtain satisfactory retention?
a) 1mm
b) 2mm
c) 3mm
d) 4mm
e) 5mm
8. Each of the following is a reason for placing a post in c) To strengthen the root
the restoration of an endodontically treated posterior
tooth EXECEPT one. Which is the EXCEPTION?
a) To enhance the retention of the core
b) To strengthen the root
c) To enhance the resistance of the restoration to lateral
forces
9. Which of the following describes the function of c) Creating a high pH conducive to bone growth
calcium hydroxide in apexification?
a) Induction of osteoclasts
b) Creating a low pH conducive to bone growth
c) Creating a High pH conducive to bone growth
d) Stimulating secondary dentin formation
10. Which of the following describe functions of the pulp? e) All answers apply
a) Defensive
b) Formative
c) Nutritive
d) Sensory
e) All answers apply
11. Which of the following is the usual sequence for the c) Root canal therapy, resection followed by periodontal therapy
amputation (resection) of a root for periodontal reasons?
a) Periodontal therapy followed by root canal therapy
b) Periodontal therapy followed by observation
c) Root canal therapy, resection followed by periodontal
therapy
d) Root canal therapy followed by observation
, 1. Which of the following describes the orifice location of c) Palatal to the orifice of the mesiobuccal canal
the 4th canal common to permanent maxillary 1st
molars?
a) On a line on the pulpal floor from the distobuccal
orifice to the mesiobuccal orifice
b) On a line on the pulpal floor from the palatal orifice to
the distobuccal orifice
c) Palatal to the orifice of the mesiobuccal canal
d) Distal to the palatal canal in patients from the pacific
islands
e) Directly under the distobuccal cusp
2. Which of the following teeth is MOST likely to d) #5
demonstrate 2 canals?
a) #14
b) #6
c) #29
d) #5
e) #13
3. Which of the following pairs of intracanal instruments d) Rotating instruments in a clockwise direction forces debris apically, while
and its action is INCORRECT? counterclockwise rotation forces debris coronally
a) K-files can be used to file and ream, while a reamer
can only be used to ream
b) Reaming action will enlarge a root canal and make it
more round in shape
c) Intracanal instruments are more susceptible to
breaking if they are rotated after becoming locked into
dentin
d) Rotating instruments in a clockwise direction forces
debris apically, while counterclockwise rotation forces
debris coronally
4. Which of the following describes why pulp capping b) Open apex allows for better circulation
and pulpotomy are more successful in more newly
erupted teeth than fully matured teeth?
a) Incomplete development of nerves
b) Open apex allows for better circulation
c) Roots are shorter
d) Greater number of odontoblasts
5. Which of the following is the MOST important factor for c) Complete mechanical debridement
disinfection of root canal?
a) Medicating the canals between appointments
b) Sodium hydrochlorite irrigation
c) Complete mechanical debridement
d) Use of EDTA before obturation of the canals
Answers
Each of the following are true regarding the treatment Antibiotics are indicated
tooth with a sinus tract EXCEPT one. Which is the
EXCEPTION?
a) Antibiotics are indicated
b) The tooth should be treated with a root canal
c) Root-end surgery should be performed if the tract
persists after the root-canal
d) The sinus tract should heal within a month of the root
canal
2. Which of the following is the MOST LIKELY adverse b) External cervical root resorption
effect of internally bleaching an endodontically treated
tooth with superoxide?
a) Demineralizeation of tooth structure
b) External cervical root resorption
c) Reinfection of the canal
d) Weakening of the remaining tooth structure
3. Each of the following is true regarding pins EXCEPT a) Pins strengthen amalgam restorations
one. Which is the EXCEPTION?
a) Pins strengthen amalgam restorations
b) Pins should not be bent
c) Pins should be placed 1mm from the DEJ
d) Pins should be placed 2mm into the amalgam
4. Each of the following statements about post a) Posts reinforce the tooth structure and prevent vertical root fractures
preparation is CORRECT EXCEPT one. Which is the
EXCEPTION?
a) Posts reinforce the tooth structure and prevent vertical
root fractures
b) Posts are indicated when there is inadequate coronal
tooth structure for fixed restorations
c) Posts retain the core for teeth with extensive coronal
tooth structure loss
d) It is recommended that at least 5mm of gutta percha
should remain in the root canal after the post space is
prepared
5. Which of the following materials is typically used for a) Sodium perborate
the walking bleach technique?
a) Sodium Perborate
b) 30% Hydrogen peroxide
c) 30% Carbamide peroxide
d) 2.6% Sodium Hypochlorite
e) 10% Phosphoric acid
f) 14% Carbamide peroxide
,6. The prognosis for internal bleaching is best if the c) Necrotic pulp tissue
etiology of the stain is...
a) Precipitation of metallic salts
b) Silver-containing root canal sealers
c) Necrotic pulp tissue
d) Amalgam restorations
7. When restoring an endodontically treated tooth with c) 3 mm
amalgam, what depth into each root canal should be
achieved to obtain satisfactory retention?
a) 1mm
b) 2mm
c) 3mm
d) 4mm
e) 5mm
8. Each of the following is a reason for placing a post in c) To strengthen the root
the restoration of an endodontically treated posterior
tooth EXECEPT one. Which is the EXCEPTION?
a) To enhance the retention of the core
b) To strengthen the root
c) To enhance the resistance of the restoration to lateral
forces
9. Which of the following describes the function of c) Creating a high pH conducive to bone growth
calcium hydroxide in apexification?
a) Induction of osteoclasts
b) Creating a low pH conducive to bone growth
c) Creating a High pH conducive to bone growth
d) Stimulating secondary dentin formation
10. Which of the following describe functions of the pulp? e) All answers apply
a) Defensive
b) Formative
c) Nutritive
d) Sensory
e) All answers apply
11. Which of the following is the usual sequence for the c) Root canal therapy, resection followed by periodontal therapy
amputation (resection) of a root for periodontal reasons?
a) Periodontal therapy followed by root canal therapy
b) Periodontal therapy followed by observation
c) Root canal therapy, resection followed by periodontal
therapy
d) Root canal therapy followed by observation
, 1. Which of the following describes the orifice location of c) Palatal to the orifice of the mesiobuccal canal
the 4th canal common to permanent maxillary 1st
molars?
a) On a line on the pulpal floor from the distobuccal
orifice to the mesiobuccal orifice
b) On a line on the pulpal floor from the palatal orifice to
the distobuccal orifice
c) Palatal to the orifice of the mesiobuccal canal
d) Distal to the palatal canal in patients from the pacific
islands
e) Directly under the distobuccal cusp
2. Which of the following teeth is MOST likely to d) #5
demonstrate 2 canals?
a) #14
b) #6
c) #29
d) #5
e) #13
3. Which of the following pairs of intracanal instruments d) Rotating instruments in a clockwise direction forces debris apically, while
and its action is INCORRECT? counterclockwise rotation forces debris coronally
a) K-files can be used to file and ream, while a reamer
can only be used to ream
b) Reaming action will enlarge a root canal and make it
more round in shape
c) Intracanal instruments are more susceptible to
breaking if they are rotated after becoming locked into
dentin
d) Rotating instruments in a clockwise direction forces
debris apically, while counterclockwise rotation forces
debris coronally
4. Which of the following describes why pulp capping b) Open apex allows for better circulation
and pulpotomy are more successful in more newly
erupted teeth than fully matured teeth?
a) Incomplete development of nerves
b) Open apex allows for better circulation
c) Roots are shorter
d) Greater number of odontoblasts
5. Which of the following is the MOST important factor for c) Complete mechanical debridement
disinfection of root canal?
a) Medicating the canals between appointments
b) Sodium hydrochlorite irrigation
c) Complete mechanical debridement
d) Use of EDTA before obturation of the canals
