NDHCE Dental Radiography

Question 1

Which of the following X-ray techniques is used to detect interproximal caries and alveolar bone levels?

Accepted Answer

Bitewing radiograph

Answer

Bitewing radiographs are specifically designed to show interproximal surfaces and the crest of alveolar bone on both arches simultaneously.

Question 2

What is the recommended target distance (focal-film distance) for a standard periapical radiograph using paralleling technique?

Accepted Answer

16 inches

Answer

The paralleling technique uses a 16-inch focal-film distance to minimize image magnification and distortion.

Question 3

Which ionizing radiation unit measures the biological effect of radiation on human tissue?

Accepted Answer

Rem (Sievert)

Answer

The rem (or Sievert in SI units) measures the dose equivalent, accounting for the biological effect of radiation on tissue.

Question 4

A radiograph appears too light (underexposed). Which of the following is the most likely cause?

Accepted Answer

Insufficient exposure time

Answer

An underexposed radiograph appears too light because insufficient exposure time results in too few X-ray photons reaching the film or sensor.

Question 5

Which of the following best describes the SLOB (Same Lingual Opposite Buccal) rule used in dental radiography?

Accepted Answer

Used to locate the position of objects in the buccolingual dimension

Answer

The SLOB rule is used with the tube-shift technique to determine whether an object is on the lingual or buccal side by observing how it moves relative to a reference object when the X-ray tube is shifted.

NDHCE - National Dental Hygiene Certification Examination Practice Test

NDHCE - National Dental Hygiene Certification Examination Practice Test

NDHCE Dental Radiography