AGD Endodontic Diagnosis and Treatment 4

Question 1

Vertical root fracture (VRF) in an endodontically treated tooth most characteristically shows which radiographic finding?

Accepted Answer

A 'halo' or 'J-shaped' periapical radiolucency along the root

Answer

Widened periodontal ligament space only at the apex

Answer

Internal root resorption

Answer

Hypercementosis at the apex

Question 2

Mineral trioxide aggregate (MTA) is the preferred material for apexification in immature permanent teeth because it:

Accepted Answer

Induces cementum-like hard tissue and is biocompatible

Answer

Sets rapidly and does not require moisture

Answer

Is easier to place than calcium hydroxide

Answer

Is less expensive than other alternatives

Question 3

A patient develops paresthesia of the lower lip following extraction of a mandibular molar. Which nerve was most likely affected?

Accepted Answer

Inferior alveolar nerve

Answer

Lingual nerve

Answer

Long buccal nerve

Answer

Mental nerve

Question 4

Which diagnostic test best differentiates a crack confined to enamel from one extending into the pulp?

Accepted Answer

Bite test using a Tooth Slooth device

Answer

Cold thermal test

Answer

Percussion test

Answer

Transillumination alone

Question 5

In regenerative endodontics for immature necrotic teeth, the biological scaffold used to support tissue ingrowth is:

Accepted Answer

A blood clot, platelet-rich plasma, or platelet-rich fibrin

Answer

MTA plug only

Answer

Gutta-percha condensed to working length

Answer

Calcium hydroxide paste

Question 6

During canal shaping, 'ledge formation' is most likely to occur when:

Accepted Answer

Using small stiff stainless steel files in curved canals without pre-curving

Answer

Using large instruments in straight canals

Answer

Irrigating excessively with NaOCl

Answer

Using NiTi files in reciprocating motion

Question 7

The 'glide path' in rotary endodontics refers to:

Accepted Answer

A smooth, reproducible path created to the working length before rotary instrumentation

Answer

The final taper achieved after full instrumentation

Answer

The angle of file insertion into the canal orifice

Answer

The radiographic outline of the root canal