Dental Dental Radiology 2

Question 1

A triangular radiolucency at the apex of a tooth most likely indicates which condition?

Accepted Answer

Periapical abscess or granuloma

Answer

A periapical radiolucency (dark area) at the root apex typically indicates a periapical abscess, granuloma, or cyst resulting from pulpal necrosis.

Question 2

Which digital radiography system captures images using a sensor plate that is later scanned with a laser?

Accepted Answer

Photostimulable phosphor (PSP) plate

Answer

PSP (photostimulable phosphor) plates store the latent X-ray image and release it when scanned with a laser, providing a digital image.

Question 3

What is the recommended interval for bitewing radiographs in an adult patient with a high caries risk?

Accepted Answer

Every 3–6 months

Answer

High-caries-risk adults should receive bitewing radiographs every 6 months or less to monitor for rapidly progressing decay.

Question 4

On a radiograph, enamel appears as the most radiopaque structure because of its high content of which mineral?

Accepted Answer

Calcium hydroxyapatite

Answer

Enamel is the most radiopaque tooth structure due to its extremely high content of calcium hydroxyapatite crystals, which absorb X-rays strongly.

Question 5

A cone-cut error on a periapical radiograph appears as which of the following?

Accepted Answer

An unexposed white area on the film

Answer

A cone-cut (PID positioning error) results in a clear unexposed area on the radiograph where the X-ray beam missed the film.

Dental Practice Test