NBDE Periodontics and Endodontics 2

Question 1

Which furcation classification indicates that a probe can pass completely through the furcation from one side to the other?

Accepted Answer

Class III

Answer

Class III furcation involvement means the probe passes completely through the furcation (through-and-through), indicating complete bone loss in the furcation area.

Question 2

A patient presents with a 'cracked tooth.' Which pulp diagnosis is MOST likely if the crack extends into the pulp chamber?

Accepted Answer

Irreversible pulpitis

Answer

A crack extending into the pulp chamber typically causes irreversible pulpitis due to bacterial contamination and inflammation that cannot resolve.

Question 3

What is the primary goal of scaling and root planing in the treatment of periodontitis?

Accepted Answer

Removal of calculus and bacterial biofilm to reduce inflammation

Answer

Scaling and root planing aims to remove calculus and bacterial biofilm from root surfaces to reduce periodontal inflammation and promote tissue healing.

Question 4

Which irrigant is used during root canal treatment primarily for its ability to dissolve organic tissue?

Accepted Answer

Sodium hypochlorite

Answer

Sodium hypochlorite (NaOCl) is the most widely used endodontic irrigant because of its unique ability to dissolve organic tissue including pulp remnants and necrotic debris.

Question 5

In periodontal disease, which cell type is primarily responsible for releasing collagenase that destroys the periodontal ligament?

Accepted Answer

Neutrophils

Answer

Neutrophils release collagenase (matrix metalloproteinases) as part of the host inflammatory response, which inadvertently destroys collagen in the periodontal ligament.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Periodontics and Endodontics 2