FREE NBDE Periodontics Questions and Answers

Question 1

A patient presents for a periodontal evaluation.
The probing depth on the facial aspect of tooth #8 is 5 mm, and there is 2 mm of gingival recession.
What is the Clinical Attachment Loss (CAL) at this site?

Accepted Answer

7 mm

Answer

3 mm

Answer

2 mm

Answer

5 mm

Question 2

Which of the following groups of bacteria, known as the "Red Complex," is strongly associated with severe and progressive forms of periodontitis?

Accepted Answer

Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola

Answer

Actinomyces naeslundii, Streptococcus mitis, Veillonella parvula

Answer

Aggregatibacter actinomycetemcomitans, Capnocytophaga gingivalis, Eikenella corrodens

Answer

Fusobacterium nucleatum, Prevotella intermedia, Campylobacter rectus

Question 3

A 22-year-old, systemically healthy patient presents with severe, rapid bone loss localized to the first molars and incisors. Clinical examination reveals deep periodontal pockets with minimal visible plaque and calculus. Which of the following is the most likely diagnosis?

Accepted Answer

Localized Aggressive Periodontitis (LAP)

Answer

Chronic Periodontitis

Answer

Necrotizing Ulcerative Periodontitis (NUP)

Answer

Gingivitis associated with dental plaque

Question 4

A patient taking nifedipine for hypertension presents with significant gingival enlargement, particularly in the anterior region. This condition is an example of:

Accepted Answer

Drug-induced gingival enlargement

Answer

Hormonal-influenced gingivitis

Answer

Hereditary gingival fibromatosis

Answer

Inflammatory gingival enlargement due to plaque

Question 5

The primary therapeutic goal of scaling and root planing (SRP) is to:

Accepted Answer

Remove plaque, calculus, and endotoxins to create a biologically compatible root surface.

Answer

Polish the enamel surfaces for aesthetic improvement.

Answer

Regenerate lost alveolar bone and periodontal ligament.

Answer

Whiten the teeth by removing extrinsic stains.

Question 6

During a periodontal examination of a maxillary molar, a Nabers probe passes completely through the furcation from the buccal to the mesial aspect, but the furcation entrance is not clinically visible due to being covered by gingival tissue. According to Glickman's classification, what is the grade of this furcation involvement?

Accepted Answer

Grade III

Answer

Grade I

Answer

Grade IV

Answer

Grade II