NDHCE Dental Radiography 2

Question 1

What is the maximum permissible dose (MPD) of radiation for an occupationally exposed dental worker per year according to NCRP guidelines?

Accepted Answer

50 mSv (5 rem)

Answer

The NCRP recommends a maximum permissible dose of 50 mSv (5 rem) per year for occupationally exposed workers.

Question 2

Which film placement error results in a foreshortened image on a periapical radiograph?

Accepted Answer

Excessive vertical angulation

Answer

Excessive positive (downward) vertical angulation causes the image to appear foreshortened, making teeth look shorter than they actually are.

Question 3

Which radiographic landmark appears as a radiolucent oval area above the roots of the maxillary central incisors?

Accepted Answer

Incisive foramen

Answer

The incisive foramen (nasopalatine foramen) appears as a round or oval radiolucency located at the midline between the roots of the maxillary central incisors.

Question 4

During fixer processing, what is the primary chemical action on the exposed radiographic film?

Accepted Answer

Removes unexposed silver halide crystals

Answer

The fixer solution removes unexposed and undeveloped silver halide crystals, clearing the non-image areas of the film.

Question 5

Which dental condition would appear radiopaque on a radiograph?

Accepted Answer

Amalgam restoration

Answer

Amalgam restorations are highly radiopaque because the metal alloy absorbs X-rays, appearing white on the radiograph.

NDHCE - National Dental Hygiene Certification Examination Practice Test

NDHCE - National Dental Hygiene Certification Examination Practice Test

NDHCE Dental Radiography 2