INBDE Endodontics practice questions

Question 1

A 24-year-old patient reports sharp pain in the upper right quadrant when drinking cold water. The pain disappears immediately once the stimulus is removed. Clinically, a deep carious lesion is noted on tooth #4. The tooth is not sensitive to percussion or palpation. What is the most likely pulpal diagnosis?

Accepted Answer

Reversible pulpitis

Answer

Normal pulp

Answer

Symptomatic irreversible pulpitis

Answer

Pulp necrosis

Question 2

A 32-year-old patient presents with spontaneous, throbbing pain in tooth #19 that keeps them awake at night. Cold testing produces intense pain that lasts for two minutes after the ice pellet is removed. The tooth is slightly sensitive to percussion, but there is no visible swelling or radiographic radiolucency. What is the correct pulpal and periapical diagnosis?

Accepted Answer

Symptomatic irreversible pulpitis; Symptomatic apical periodontitis

Answer

Reversible pulpitis; Normal apical tissues

Answer

Symptomatic irreversible pulpitis; Normal apical tissues

Answer

Pulp necrosis; Acute apical abscess

Question 3

A 9-year-old boy presents to the clinic 30 minutes after falling and avulsing tooth #8. The tooth was placed in a cup of cold milk immediately after the accident. What is the most critical factor for the long-term prognosis of the replanted tooth?

Accepted Answer

The extra-oral dry time and health of the PDL cells

Answer

The use of systemic antibiotics

Answer

Immediate initiation of root canal therapy at the chairside

Answer

The type of splint used (rigid vs. flexible)

Question 4

During the cleaning and shaping of a necrotic maxillary molar, the clinician uses 5.25% sodium hypochlorite (NaOCl). Which of the following is a primary function of NaOCl that is NOT shared by EDTA?

Accepted Answer

Dissolution of organic tissue

Answer

Removal of the inorganic smear layer

Answer

Lubrication of the root canal

Answer

Chelation of calcium ions

Question 5

A 12-year-old presents with a fracture on tooth #9 that exposes the pulp. The tooth has an open apex and the pulp is vital. The clinician performs a shallow pulpotomy to maintain pulp vitality and allow for continued root development. This procedure is known as:

Accepted Answer

Apexogenesis

Answer

Apexification

Answer

Pulpectomy

Answer

Revascularization

Question 6

A patient presents with a localized fluctuant swelling in the gingiva adjacent to tooth #3. The tooth does not respond to cold or EPT. Radiographically, there is a large periapical radiolucency. What is the most likely periapical diagnosis?

Accepted Answer

Acute apical abscess

Answer

Symptomatic apical periodontitis

Answer

Asymptomatic apical periodontitis

Answer

Chronic apical abscess

Question 7

When performing an endodontic access on a maxillary first molar, the clinician should be most aware of the frequent presence of a fourth canal (MB2). In which location is this canal typically found?

Accepted Answer

Lingual to the MB1 canal

Answer

Distal to the MB1 canal

Answer

Mesial to the Palatal canal

Answer

Between the Distobuccal and Palatal canals

Question 8

A patient presents with a deep periodontal pocket (9mm) on the facial aspect of tooth #20. The tooth is non-responsive to cold and EPT. There is no significant bone loss on adjacent teeth. What is the most likely origin of this lesion?

Accepted Answer

Primary endodontic lesion with secondary periodontal involvement

Answer

Primary periodontal lesion

Answer

True combined endo-perio lesion

Answer

Iatrogenic lesion

Question 9

Which of the following describes the most accurate use of the Electric Pulp Tester (EPT)?

Accepted Answer

It indicates the presence of vital sensory nerve fibers

Answer

It measures the health of the pulpal vascular supply

Answer

It provides a quantitative measurement of the degree of inflammation

Answer

It is highly reliable in immature teeth with open apices

Question 10

During root canal treatment, the clinician establishes the 'working length.' What is the anatomical landmark that endodontic preparation and obturation should ideally terminate at?

Accepted Answer

The apical constriction (minor diameter)

Answer

The radiographic apex

Answer

The anatomical apex

Answer

The apical foramen (major diameter)

INBDE Endodontics practice questions

A 9-year-old boy presents to the clinic 30 minutes after falling and avulsing tooth #8. The tooth was placed in a cup of cold milk immediately after the accident. What is the most critical factor for the long-term prognosis of the replanted tooth?

During the cleaning and shaping of a necrotic maxillary molar, the clinician uses 5.25% sodium hypochlorite (NaOCl). Which of the following is a primary function of NaOCl that is NOT shared by EDTA?

A 12-year-old presents with a fracture on tooth #9 that exposes the pulp. The tooth has an open apex and the pulp is vital. The clinician performs a shallow pulpotomy to maintain pulp vitality and allow for continued root development. This procedure is known as:

A patient presents with a localized fluctuant swelling in the gingiva adjacent to tooth #3. The tooth does not respond to cold or EPT. Radiographically, there is a large periapical radiolucency. What is the most likely periapical diagnosis?

When performing an endodontic access on a maxillary first molar, the clinician should be most aware of the frequent presence of a fourth canal (MB2). In which location is this canal typically found?

A patient presents with a deep periodontal pocket (9mm) on the facial aspect of tooth #20. The tooth is non-responsive to cold and EPT. There is no significant bone loss on adjacent teeth. What is the most likely origin of this lesion?

Which of the following describes the most accurate use of the Electric Pulp Tester (EPT)?

During root canal treatment, the clinician establishes the 'working length.' What is the anatomical landmark that endodontic preparation and obturation should ideally terminate at?

The first 10 are free. 6 more below.

A 45-year-old patient presents with a sinus tract on the buccal gingiva of tooth #30. The tooth is asymptomatic and has a large composite restoration. The tooth does not respond to thermal testing. What is the most likely periapical diagnosis?

Which material is considered the 'gold standard' storage medium for an avulsed tooth if immediate replantation is not possible?

A radiograph shows a uniform, circular radiolucency in the middle third of the root of tooth #8. When a second radiograph is taken at a different horizontal angle, the radiolucency remains centered over the root canal. This suggests:

Following trauma, a tooth is displaced laterally and is firmly locked in its new position. A high-pitched, metallic 'ankylotic' sound is heard on percussion. What is the most likely injury?

The use of EDTA during endodontic treatment is primarily indicated for its ability to:

Which of the following is the most important factor in the long-term success of root canal treatment?