Dental Dental Radiography 2

Question 1

Which lead equivalent thickness is required for a dental X-ray leaded apron?

Accepted Answer

0.25 mm

Answer

The American Dental Association recommends a leaded apron with at least 0.25 mm lead equivalent to protect the patient's body during dental radiography.

Question 2

What radiographic error results in a foreshortened image of the tooth?

Accepted Answer

Excessive vertical angulation

Answer

Foreshortening occurs when the vertical angulation is too steep, causing the X-ray beam to strike the tooth and film at too great an angle.

Question 3

Cone-cutting (partial image) on a dental X-ray is caused by which error?

Accepted Answer

PID not centered over the film/sensor

Answer

Cone-cutting occurs when the position-indicating device (PID/cone) is not properly aligned so the X-ray beam only partially exposes the film or sensor.

Question 4

Which type of radiation is most effectively blocked by a lead thyroid collar?

Accepted Answer

Secondary (scatter) radiation

Answer

Thyroid collars are designed to protect the thyroid gland from secondary scatter radiation that is produced when the primary beam interacts with patient tissues.

Question 5

What is the recommended frequency for bitewing radiographs in an adult patient with low caries risk?

Accepted Answer

Every 2–3 years

Answer

The ADA recommends bitewing radiographs every 2–3 years for adult patients with low caries risk and no active disease.

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Dental Dental Radiography 2