Endo OSCE Exam Questions With Complete Solutions
Course
ADEX DSE OSCE
Question 1:
What is the primary purpose of root canal therapy?
A) To whiten discolored teeth
B) To treat dental caries
C) To remove infected pulp and preserve the tooth
D) To extract a tooth
Answer: C) To remove infected pulp and preserve the tooth
Rationale: The primary purpose of root canal therapy is to remove infected or necrotic pulp
tissue from within the tooth, thereby preventing further infection and preserving the natural
tooth structure.
Question 2:
Which of the following instruments is commonly used for accessing the pulp chamber
during endodontic treatment?
A) Curette
B) Scaler
C) Endodontic hand file
D) Endodontic bur
Answer: D) Endodontic bur
Rationale: An endodontic bur is specifically designed to create an access opening to the pulp
chamber and facilitate the removal of pulp tissue during root canal therapy.
Question 3:
What is the term for the space within the tooth that contains the pulp?
A) Periodontal space
B) Pulp canal
C) Pulp chamber
D) Apical foramen
Answer: C) Pulp chamber
Rationale: The pulp chamber is the central space within the tooth that houses the pulp,
including nerves and blood vessels, and is connected to the pulp canal, which extends toward
the root tip.
,Question 4:
What is the main reason for using a rubber dam during endodontic procedures?
A) To provide a sterile environment
B) To improve visibility
C) To isolate the tooth from saliva and debris
D) To prevent bleeding
Answer: C) To isolate the tooth from saliva and debris
Rationale: A rubber dam is used during endodontic procedures to isolate the tooth being
treated from saliva and other contaminants, ensuring a clean working area and reducing the
risk of infection.
Question 5:
Which of the following is a common complication of improperly performed root canal
therapy?
A) Periodontal disease
B) Tooth mobility
C) Root resorption
D) Caries
Answer: C) Root resorption
Rationale: Improperly performed root canal therapy can lead to complications such as root
resorption, which occurs when the body’s own cells begin to break down the root structure
due to infection or inflammation.
Question 6:
What is the purpose of obturation in endodontic treatment?
A) To clean the canal system
B) To fill the pulp chamber
C) To seal the canal space and prevent re-infection
D) To place a crown
Answer: C) To seal the canal space and prevent re-infection
Rationale: Obturation involves filling the canal space with a biocompatible material to seal it
from bacteria and prevent re-infection after the pulp has been removed and the canal has been
cleaned.
,Question 7:
What is the most commonly used material for root canal filling?
A) Composite resin
B) Amalgam
C) Gutta-percha
D) Glass ionomer
Answer: C) Gutta-percha
Rationale: Gutta-percha is the most commonly used material for filling root canals because
of its biocompatibility, inert nature, and ability to create a seal within the canal system.
Question 8:
Which radiographic technique is commonly used to confirm the working length of a
root canal?
A) Bitewing radiography
B) Periapical radiography
C) Panoramic radiography
D) Cone beam computed tomography (CBCT)
Answer: B) Periapical radiography
Rationale: Periapical radiography is commonly used to confirm the working length of a root
canal by providing a clear view of the tooth roots and the apical foramen.
Question 9:
What is the most common reason for endodontic failure?
A) Incomplete cleaning and shaping of the canal
B) Inadequate obturation
C) Presence of complex canal systems
D) All of the above
Answer: D) All of the above
Rationale: Endodontic failure can result from multiple factors, including incomplete
cleaning and shaping, inadequate obturation, and the presence of complex canal systems that
may not have been properly addressed.
Question 10:
, What is the purpose of using sodium hypochlorite during endodontic treatment?
A) To lubricate the instruments
B) To disinfect the canal system
C) To act as a temporary filling material
D) To promote healing
Answer: B) To disinfect the canal system
Rationale: Sodium hypochlorite is commonly used as an irrigant during endodontic
treatment due to its effective antibacterial properties, helping to disinfect the canal system
and dissolve organic tissue.
Question 11:
Which of the following instruments is used to determine the working length of a root
canal?
A) K-file
B) H-file
C) Endodontic explorer
D) Apex locator
Answer: D) Apex locator
Rationale: An apex locator is an electronic device used to determine the working length of a
root canal by measuring the impedance of the canal and locating the apex of the tooth.
Question 12:
What is the most common bacteria associated with endodontic infections?
A) Streptococcus mutans
B) Enterococcus faecalis
C) Staphylococcus aureus
D) Lactobacillus casei
Answer: B) Enterococcus faecalis
Rationale: Enterococcus faecalis is frequently isolated from endodontic infections,
particularly in cases of treatment failure, due to its ability to survive in hostile environments.
Question 13:
What is the ideal pH range of a root canal irrigant to effectively dissolve necrotic tissue?
A) 2-4
B) 5-7
Course
ADEX DSE OSCE
Question 1:
What is the primary purpose of root canal therapy?
A) To whiten discolored teeth
B) To treat dental caries
C) To remove infected pulp and preserve the tooth
D) To extract a tooth
Answer: C) To remove infected pulp and preserve the tooth
Rationale: The primary purpose of root canal therapy is to remove infected or necrotic pulp
tissue from within the tooth, thereby preventing further infection and preserving the natural
tooth structure.
Question 2:
Which of the following instruments is commonly used for accessing the pulp chamber
during endodontic treatment?
A) Curette
B) Scaler
C) Endodontic hand file
D) Endodontic bur
Answer: D) Endodontic bur
Rationale: An endodontic bur is specifically designed to create an access opening to the pulp
chamber and facilitate the removal of pulp tissue during root canal therapy.
Question 3:
What is the term for the space within the tooth that contains the pulp?
A) Periodontal space
B) Pulp canal
C) Pulp chamber
D) Apical foramen
Answer: C) Pulp chamber
Rationale: The pulp chamber is the central space within the tooth that houses the pulp,
including nerves and blood vessels, and is connected to the pulp canal, which extends toward
the root tip.
,Question 4:
What is the main reason for using a rubber dam during endodontic procedures?
A) To provide a sterile environment
B) To improve visibility
C) To isolate the tooth from saliva and debris
D) To prevent bleeding
Answer: C) To isolate the tooth from saliva and debris
Rationale: A rubber dam is used during endodontic procedures to isolate the tooth being
treated from saliva and other contaminants, ensuring a clean working area and reducing the
risk of infection.
Question 5:
Which of the following is a common complication of improperly performed root canal
therapy?
A) Periodontal disease
B) Tooth mobility
C) Root resorption
D) Caries
Answer: C) Root resorption
Rationale: Improperly performed root canal therapy can lead to complications such as root
resorption, which occurs when the body’s own cells begin to break down the root structure
due to infection or inflammation.
Question 6:
What is the purpose of obturation in endodontic treatment?
A) To clean the canal system
B) To fill the pulp chamber
C) To seal the canal space and prevent re-infection
D) To place a crown
Answer: C) To seal the canal space and prevent re-infection
Rationale: Obturation involves filling the canal space with a biocompatible material to seal it
from bacteria and prevent re-infection after the pulp has been removed and the canal has been
cleaned.
,Question 7:
What is the most commonly used material for root canal filling?
A) Composite resin
B) Amalgam
C) Gutta-percha
D) Glass ionomer
Answer: C) Gutta-percha
Rationale: Gutta-percha is the most commonly used material for filling root canals because
of its biocompatibility, inert nature, and ability to create a seal within the canal system.
Question 8:
Which radiographic technique is commonly used to confirm the working length of a
root canal?
A) Bitewing radiography
B) Periapical radiography
C) Panoramic radiography
D) Cone beam computed tomography (CBCT)
Answer: B) Periapical radiography
Rationale: Periapical radiography is commonly used to confirm the working length of a root
canal by providing a clear view of the tooth roots and the apical foramen.
Question 9:
What is the most common reason for endodontic failure?
A) Incomplete cleaning and shaping of the canal
B) Inadequate obturation
C) Presence of complex canal systems
D) All of the above
Answer: D) All of the above
Rationale: Endodontic failure can result from multiple factors, including incomplete
cleaning and shaping, inadequate obturation, and the presence of complex canal systems that
may not have been properly addressed.
Question 10:
, What is the purpose of using sodium hypochlorite during endodontic treatment?
A) To lubricate the instruments
B) To disinfect the canal system
C) To act as a temporary filling material
D) To promote healing
Answer: B) To disinfect the canal system
Rationale: Sodium hypochlorite is commonly used as an irrigant during endodontic
treatment due to its effective antibacterial properties, helping to disinfect the canal system
and dissolve organic tissue.
Question 11:
Which of the following instruments is used to determine the working length of a root
canal?
A) K-file
B) H-file
C) Endodontic explorer
D) Apex locator
Answer: D) Apex locator
Rationale: An apex locator is an electronic device used to determine the working length of a
root canal by measuring the impedance of the canal and locating the apex of the tooth.
Question 12:
What is the most common bacteria associated with endodontic infections?
A) Streptococcus mutans
B) Enterococcus faecalis
C) Staphylococcus aureus
D) Lactobacillus casei
Answer: B) Enterococcus faecalis
Rationale: Enterococcus faecalis is frequently isolated from endodontic infections,
particularly in cases of treatment failure, due to its ability to survive in hostile environments.
Question 13:
What is the ideal pH range of a root canal irrigant to effectively dissolve necrotic tissue?
A) 2-4
B) 5-7
