NBDHE NBDHE Dental Hygiene Care 5

Question 1

During an oral cancer screening, which tissue change warrants an immediate biopsy referral?

Accepted Answer

A white lesion that cannot be scraped off and has been present for 3 weeks

Answer

A persistent white lesion (leukoplakia) that cannot be removed by wiping and has lasted more than 2 weeks must be referred for biopsy to rule out dysplasia or malignancy.

Question 2

A patient requires nitrous oxide/oxygen sedation. Which of the following is an absolute contraindication?

Accepted Answer

First trimester of pregnancy

Answer

Nitrous oxide is absolutely contraindicated in the first trimester of pregnancy due to its inhibition of methionine synthase and potential teratogenic effects.

Question 3

Which instrument design feature makes a curette different from a sickle scaler?

Accepted Answer

Curettes have a rounded back and toe; sickle scalers have a pointed back and toe

Answer

Curettes have a rounded back and rounded toe, making them safe for subgingival use, whereas sickle scalers have a pointed toe and triangular cross-section.

Question 4

A patient has probe readings of 2–3 mm with no bone loss detected radiographically. There is bleeding on probing at 60% of sites. This presentation is consistent with:

Accepted Answer

Plaque-induced gingivitis

Answer

Normal probing depths with no bone loss but widespread bleeding on probing indicates gingivitis, which is reversible with improved oral hygiene.

Question 5

Which of the following best explains the significance of the col in periodontal disease susceptibility?

Accepted Answer

It is a non-keratinized valley between papillae that is difficult to clean and susceptible to disease

Answer

The col is a non-keratinized concave area between the facial and lingual papillae that is inaccessible to routine cleaning and highly susceptible to periodontal breakdown.

NBDHE Test Practice Test

NBDHE Test Practice Test

NBDHE NBDHE Dental Hygiene Care 5