NBDHE Dental Radiography and Interpretation 3

Question 1

What does a 'double lamina dura' on a periapical radiograph suggest?

Accepted Answer

Hypercementosis or Paget's disease affecting the root surface

Answer

A thickened or double lamina dura appearance can suggest hypercementosis (excess cementum deposition) or Paget's disease of bone, which alters the normal PDL space and cortical bone appearance.

Question 2

Cone-beam computed tomography (CBCT) is preferred over conventional radiography for which specific clinical application in dental hygiene practice?

Accepted Answer

Assessment of alveolar bone morphology and furcation defects in complex periodontal cases

Answer

CBCT provides three-dimensional visualization of alveolar bone, enabling precise assessment of bone defect morphology, furcation involvement, and root proximity that conventional 2D radiography cannot fully depict.

Question 3

An interproximal carious lesion that radiographically appears to extend through enamel and into the outer third of dentin is classified as:

Accepted Answer

D2 (extends into dentin but not past the outer one-third)

Answer

Radiographic caries classification: D1 = enamel only; D2 = extends into dentin, outer third; D3 = extends into dentin, middle or inner third; D4 = approaches or involves the pulp.

Question 4

Which radiation safety device is MOST appropriate for a dental hygienist to use to monitor cumulative occupational radiation exposure?

Accepted Answer

Thermoluminescent dosimeter (TLD) or digital optically stimulated luminescence (OSL) badge

Answer

TLD or OSL personnel monitoring badges worn on the torso measure cumulative radiation dose over time and are the standard method for monitoring occupational radiation exposure for dental workers.

Question 5

A periapical radiograph showing a well-defined, unilocular radiolucency associated with the crown of an unerupted tooth is MOST consistent with:

Accepted Answer

Dentigerous (follicular) cyst

Answer

A dentigerous (follicular) cyst is the most common odontogenic cyst arising from the follicle surrounding an unerupted tooth, presenting as a well-defined unilocular radiolucency attached at the cementoenamel junction.

NBDHE Test Practice Test

NBDHE Test Practice Test

NBDHE Dental Radiography and Interpretation 3