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

1 mSv (0.1 rem)

Answer

5 mSv (0.5 rem)

Answer

100 mSv (10 rem)

Question 2

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

Accepted Answer

Excessive vertical angulation

Answer

Insufficient vertical angulation

Answer

Incorrect horizontal angulation

Answer

Film placed backwards

Question 3

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

Accepted Answer

Incisive foramen

Answer

Mental foramen

Answer

Nasal fossa

Answer

Maxillary sinus

Question 4

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

Accepted Answer

Removes unexposed silver halide crystals

Answer

Develops latent image by reducing silver ions

Answer

Hardens and clears the emulsion

Answer

Neutralizes the developer solution

Question 5

Which dental condition would appear radiopaque on a radiograph?

Accepted Answer

Amalgam restoration

Answer

Pulp chamber

Answer

Periapical abscess

Answer

Dental caries

Question 6

What does the term 'long-cone technique' refer to in dental radiography?

Accepted Answer

Paralleling technique using a 16-inch focal-film distance

Answer

Bisecting angle technique using a long cone

Answer

Panoramic technique with extended source distance

Answer

Occlusal technique for large areas