What is the primary purpose of performing a pulpotomy in primary teeth?
A) To remove the entire pulp
B) To preserve the vitality of the remaining pulp
C) To prevent future decay
D) To perform root canal therapy
Answer: B) To preserve the vitality of the remaining pulp
Rationale: A pulpotomy involves the removal of the coronal portion of the pulp in a vital
tooth to preserve the health of the remaining pulp, which is especially important in primary
teeth to maintain their function until natural exfoliation occurs.
Question 2:
Which of the following materials is most commonly used for root canal obturation?
A) Composite resin
B) Gutta-percha
C) Glass ionomer
D) Resin cement
Answer: B) Gutta-percha
Rationale: Gutta-percha is the gold standard material for root canal obturation due to its
biocompatibility, ability to create a seal, and ease of manipulation within the canal.
Question 3:
What is the most critical factor in determining the success of endodontic treatment?
A) The type of filling material used
B) The experience of the operator
C) Proper cleaning and shaping of the canal
D) Patient age
Answer: C) Proper cleaning and shaping of the canal
Rationale: Effective cleaning and shaping are essential for removing infected tissue and
,bacteria from the canal system, which is crucial for achieving a successful outcome in
endodontic therapy.
Question 4:
What does the term "apical closure" refer to in endodontics?
A) The sealing of the canal space
B) The formation of hard tissue at the apex
C) The filling of the entire root canal
D) The removal of the pulp
Answer: B) The formation of hard tissue at the apex
Rationale: Apical closure refers to the biological process of hard tissue formation at the apex
of a tooth, often achieved through procedures like apexification, allowing for proper sealing
and healing of the root.
Question 5:
Which of the following is an indication for endodontic retreatment?
A) Presence of a periodontal abscess
B) Incomplete canal obturation
C) Vital pulp with no symptoms
D) Successful initial treatment
Answer: B) Incomplete canal obturation
Rationale: Incomplete canal obturation can lead to reinfection and is a common indication
for endodontic retreatment, as it compromises the seal and integrity of the canal system.
Question 6:
What is the recommended irrigant for disinfection during root canal treatment?
A) Hydrogen peroxide
B) Sodium hypochlorite
C) Ethanol
D) Chlorhexidine
Answer: B) Sodium hypochlorite
Rationale: Sodium hypochlorite is the preferred irrigant for root canal disinfection due to its
potent antimicrobial properties and ability to dissolve organic tissue.
,Question 7:
What is the significance of the “working length” in endodontics?
A) It determines the final restoration type
B) It ensures proper canal cleaning
C) It indicates the length of the gutta-percha cone
D) It prevents over-instrumentation
Answer: D) It prevents over-instrumentation
Rationale: Determining the correct working length is crucial to avoid over-instrumentation,
which can lead to complications such as perforation or damage to surrounding tissues.
Question 8:
Which of the following is a common symptom of irreversible pulpitis?
A) Mild sensitivity to hot and cold
B) Spontaneous, severe pain
C) No pain
D) Pain only when biting
Answer: B) Spontaneous, severe pain
Rationale: Irreversible pulpitis typically presents with spontaneous, severe pain that may not
be relieved by analgesics, indicating the pulp is necrotic and requires treatment.
Question 9:
In a tooth with a necrotic pulp, what is the best initial treatment approach?
A) Vital pulp therapy
B) Extraction
C) Root canal therapy
D) Pulp capping
Answer: C) Root canal therapy
Rationale: The best initial treatment for a tooth with a necrotic pulp is root canal therapy, as
it addresses the infection and aims to preserve the tooth.
Question 10:
What is the primary advantage of using mineral trioxide aggregate (MTA) in
endodontic procedures?
, A) It is a cheap material
B) It is easy to manipulate
C) It has excellent sealing properties
D) It promotes root fracture
Answer: C) It has excellent sealing properties
Rationale: MTA is favored in endodontics for its excellent sealing ability, biocompatibility,
and capacity to stimulate hard tissue formation, making it ideal for procedures like pulp
capping and root-end filling.
Question 11:
What is the most common cause of a periapical abscess?
A) Trauma
B) Bacterial infection
C) Genetic factors
D) Cavity
Answer: B) Bacterial infection
Rationale: A periapical abscess is primarily caused by bacterial infection, typically resulting
from pulp necrosis due to untreated caries or trauma, leading to the accumulation of pus at
the apex of the tooth.
Question 12:
Which of the following is a contraindication for using calcium hydroxide as an
intracanal medicament?
A) Pulp necrosis
B) Presence of a large periapical lesion
C) Immature apex
D) Acute apical periodontitis
Answer: B) Presence of a large periapical lesion
Rationale: Calcium hydroxide is contraindicated in the presence of large periapical lesions as
it may not effectively address the underlying infection, necessitating a more aggressive
treatment approach.
Question 13:
Which radiographic view is preferred for evaluating the apices of the maxillary molars?
A) Periapical radiograph
B) Bitewing radiograph
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