DH103 Dental Radiology Quiz #2 Module 3

(1) Density is the overall darkness or blackness of a dental image. (2) When the kilovoltage is increased while other exposure factors remain constant, the resultant image exhibits a decreased density and appears lighter.

The first statement is true; the second statement is false.

A longer position-indicating device (PID) results in

an increased target-receptor distance.

Your new adult patient has no clinical sign of disease and no restorations. Which of the following images should you take?

Bite-wings

A good "trick" to open the contacts between the maxillary 1st and 2nd molars is to

tilt the butt of the tubehead in the mesial direction.

When a high operating kilovoltage is used, _______(low OR high) subject contrast and _____________(many shades of gray OR areas of black and white) are seen on the dental image.

Low subject contrast; many shades of gray

Radiolucent refers to that portion of a dental image that is

black.

When lower kilovoltage settings are used, an image with ____ will result.

high contrast

Which of the following is an advantage of digital imaging?

Increased speed for viewing images

The bite-wing image is used in the

Interproximal examination

Your 35-year-old patient has clinical attachment loss in the posterior teeth. What type of bite-wing images should you take, and what size receptor should you use?

Vertical; 2

The contacts on your dental image are closed. You will need to take a retake. What should you do in order to achieve open contacts on your retake dental image?

Direct the PID through the contacts of the teeth.

CMS stands for

complete mouth series.

Vertical bite-wings are often used for patients with

bone loss.

Which of the following intraoral images is used to evaluate the crown, roots, and supporting bone of a tooth?

Periapical

Which size bite-wing receptor may be placed in a horizontal or vertical position?

Size 2

Where should you position the mesial edge of the receptor when taking a premolar bite-wing image?

Midline of the mandibular canine

Your patient asked you why dental images are important. Which of the following is the correct response?

Many dental diseases are typically discovered only through the use of dental images.

You are showing your patient a bite-wing image. Your patient points to a portion of the tooth that is the most radiopaque and wants to know what it is. What portion of the tooth is your patient pointing to?

The enamel

A dental image that has ______________ is said to have high contrast.

very dark areas and very light areas

Density is defined as

the overall blackness or darkness of an image.

If the milliamperage is increased, the receptor density ________, and the image appears _________.

Group of answer choices

increases; darker

If the operating kilovoltage is increased, the receptor density ____ because the average energy of the x-rays is raised.

increases

You have to retake a dental image on your patient because the image is too light and is undiagnostic. Which of the following could you change to produce an image with increased density?

Increasing the exposure time

The teeth on your patient's images appear very radiopaque and the periodontium and tissue appear very radiolucent. Your patient's dental image has

high contrast.

The range of useful densities seen on a dental image is termed the

scale of contrast.

The geometric characteristic of _____________ refers to an image that appears larger than the actual size of the object it represents.

magnification

To minimize dimensional distortion, the object and receptor must be _____________ one another.

parallel to

You are taking dental images on your patient. You have directed the position indicating device (PID) perpendicular to the tooth and the receptor. Which of the following would you minimize by doing this?

Dimensional distortion

Which of the following areas would appear the most radiopaque on a dental image?

Enamel

Bisecting and paralleling are two methods used for obtaining which of the following dental images?

Periapicals

Which of the following is an extraoral image?

Lateral jaw

How many dental images would you take on your patient if you were taking a CMS?

14-20

How many dental images would you take for a CMR on your edentulous patient?

14

Which of the following is an extraoral technique for dental image examination?

Panoramic

Periapical images must show the entire crowns and roots of the teeth being examined as well as ____ to ____ mm beyond the root apices.

2.0; 3.0

Your Adult patient has no clinical sign of disease; how frequently should you take a CMS on your patient?

You cannot take a CMS

When are bite-wings and periapical images prescribed?

As needed, based on the patient's individual needs

Which of the following is used for an interproximal evaluation?

Bite-wing

When determining vertical angulation, if the position-indicating device (PID) is positioned above the occlusal plane and the central ray is directed _______, the vertical angulation is termed _________.

Group of answer choices

downward; positive

Where should you position the mesial edge of the receptor when taking a molar bite-wing image?

Group of answer choices

Midline of the mandibular second premolar

(1) Overlapped interproximal contacts are caused by improper vertical angulation. (2) To prevent overlap, the vertical angulation should be adjusted to +10 degrees.

Group of answer choices

Both statements are false.