DANB RHS Basic Q's

Full Mock Exam For DANB Radiology

The primary purpose of dental radiographs is to:

B. Detect conditions not visible clinically

Which radiograph shows the entire tooth and surrounding bone?

B. Periapical

Bitewing radiographs are primarily used to detect:

B. Interproximal caries

Which technique produces the most accurate dental image?

B. Paralleling

Overlapping contacts are caused by incorrect:

B. Horizontal angulation

Foreshortening occurs when:

A. Vertical angulation is too steep

Elongation occurs when:

B. Vertical angulation is too shallow

A cone cut appears when:

A. Beam not centered on receptor

Which radiograph is best for evaluating bone levels in periodontal disease?

A. Bitewing

The central ray should pass through contact areas when taking:

A. Bitewings

Which radiograph shows large areas of the maxilla or mandible?

A. Occlusal

What causes blurred radiographs?

A. Movement

When a radiograph appears too dark, the cause may be:

A. Overexpousre

If a radiograph appears too light, it may be due to:

B. Underexposure

The bitewing tab is used to:

B. Position receptor between teeth

The paralleling technique requires the receptor to be:

B. Parallel to the tooth

A radiolucent area appears:

B. Dark

A radiopaque structure appears:

C. White/light

Incorrect horizontal angulation causes:

C. Overlapping contacts

What helps stabilize receptors during X-rays?

B. Film holders

The part of the X-ray machine that directs radiation is the:

B. PID

The PID helps:

B. Aim the X-ray beam

What causes film bending artifacts?

A. Patient biting too hard

A reversed film produces:

B. Herringbone pattern

Which radiograph is best for detecting impacted teeth?

B. Panoramic

Vertical bitewings are commonly used to evaluate:

B. Bone loss

Exposure time controls:

B. Radiation quantity

kVp affects:

A. Beam energy

mA affects:

B. Beam direction

If the receptor is placed too far from the tooth, the image will be:

B. Larger

What helps reduce image distortion?

A. Long PID

The best technique for accurate bone level imaging is:

A. Paralleling technique

Which radiograph is often used for orthodontic planning?

B. Cephalometric

What type of receptor is most commonly used today?

B. Digital sensor

Digital radiography typically requires:

A. Less radiation

Motion during exposure causes:

C. Blurred image

If vertical angulation is excessive:

B. Foreshortening occurs

If vertical angulation is insufficient:

B. Elongation occurs

X-rays are a form of:

B. Electromagnetic energy

X-rays travel at the speed of:

B. Light

X-rays have:

B. No mass or charge

The process of removing electrons from atoms is called:

A. Ionization

Scatter radiation occurs when:

A. Beam changes direction after hitting matter

The ALARA principle means:

B. As Low As Reasonably Achievable

The unit used to measure absorbed radiation dose is:

A. Gray

The unit used to measure radiation risk to tissues is:

B. Gram

Filtration in an X-ray machine removes:

B. Low-energy photons

Collimation reduces:

A. Patient exposure

A lead apron protects patients from:

B. Scatter radiation

The thyroid collar protects the:

B. Thyroid gland

The long PID reduces:

A. Radiation exposure

The dental assistant should stand at least:

C. 6 feet away

The safest position during exposure is:

B. 90-135 from beam

The rectangular collimator reduces exposure by:

C. 60%

Which tissue is most sensitive to radiation?

C. Thyroid

Radiation damage accumulates over time due to

A. Cumulative effect

The process of producing X-rays occurs in the:

A. Tube head

The most effective method to prevent disease transmission is:

A. Hand Hygiene

Gloves should be worn when:

D. All of the above

Barriers should be placed on

D. All of the Above

Digital sensors should be:

B. Disinfected and barrier wrapped

Cross-contamination occurs when:

A. Microorganisms transfer from one surface to another

After removing gloves, the dental assistant should:

A. Wash hands

Reusable film holders should be:

B. Sterilized

Disposable items should be:

C. Discarded after use

Protective eyewear prevents:

B. Splash contamination

Which PPE protects the nose and mouth?

A. Mask

Barriers should be changed:

B. Between patients

The X-ray tube head should be

B. Barrier protected

Hand hygiene should occur:

D. All of the above

Contaminated gloves touching clean surfaces causes:

B. Cross-Contamination

The purpose of barriers is to:

A. Prevent contamination

The most common infection control guideline used in dentistry is:
Standard Precautions which assumes:

B. All patients may carry infection

Sensors should be covered with:

A. Plastic barrier sheath

After radiographs are taken, contaminated barriers should be:

C. Disposed properly