ADAT Dental Radiology & Imaging

Question 1

Which radiographic technique positions the image receptor parallel to the long axis of the tooth and directs the central beam perpendicular to both?

Accepted Answer

Paralleling technique

Answer

The paralleling technique places the receptor parallel to the teeth and aims the beam perpendicularly, minimizing geometric distortion compared to the bisecting angle technique.

Question 2

Which type of radiograph is most effective for detecting interproximal caries in posterior teeth?

Accepted Answer

Bitewing radiograph

Answer

Bitewing radiographs image the crowns of both arches simultaneously and are the gold standard for detecting early interproximal carious lesions.

Question 3

Which radiation unit accounts for the biological effect of ionizing radiation on human tissues?

Accepted Answer

Sievert (Sv)

Answer

The Sievert (Sv) is the SI unit of equivalent dose, incorporating both the absorbed dose and the radiation weighting factor to reflect biological damage.

Question 4

A processed periapical radiograph appears light and lacks adequate image density. Which processing error is the most likely cause?

Accepted Answer

Developer solution that is too cool

Answer

A developer solution that is too cool slows the chemical reduction reaction, resulting in an underdeveloped, light radiograph with poor density.

Question 5

What does the ALARA principle stand for in dental radiation protection?

Accepted Answer

As Low As Reasonably Achievable

Answer

ALARA — As Low As Reasonably Achievable — is the guiding principle in radiation protection, requiring operators to minimize patient and occupational exposure at all times.

Advanced Dental Admission Test (ADAT) Practice Test

Advanced Dental Admission Test (ADAT) Practice Test

ADAT Dental Radiology & Imaging