✨✨✨DH103 Dental Radiology Quiz#4 Module 6 Refined*

All ionizing radiations cause damage to living tissues. Although very little radiation is used in dentistry, damage to the cells can occur

Both statements are true

The indirect theory proposes that

Toxins are created from the formation of free radicals

A nonthreshold dose-response curve suggests that

Radiation exposure, no matter how small, causes damage to living tissue

Stochastic biologic effects from radiation

Occur as a result of exposure, but severity is not determined by dose

__________ refers to the total amount of radiation that is received or absorbed

Total dose

Which types of cells are more sensitive to radiation

Rapidly dividing and young cells

Which of the following statements is true of somatic effects of irradiation

Changes are not transmitted to future generations

Which of the following is the least sensitive to x-rays

Salivary glands

The traditional unit of dose is called

Radiation absorbed dose (rad)

__________ is/are the single largest contributor to artificial radiation exposure

Medical radiation

The potential risk of dental radiography inducing a fatal cancer in an individual is about ______ the risk of a person developing cancer spontaneously

1/1000

Your patient is concerned about being exposed to dental x-rays. Which of the following could you tell your patient to alleviate their fears

The risks from dental imaging are less than the risks of other everyday activities in modern life

Explain to your patient the steps, in order, in the formation of hydrogen peroxide, a toxin that will cause damage to living tissues

X-ray photons are absorbed by water → Free radical formation → Free radicals combine → Cellular dysfunction and biologic damage

The occlusal technique is used to examine

Large areas of the upper or lower jaw

Which size receptor would you use to take an occlusal image on your 3-year-old patient

2

Which of the following is a maxillary occlusal projection but not a mandibular occlusal projection

Lateral occlusal projection

Which occlusal projection is used to locate foreign bodies or salivary stones in the region of the floor of the mouth

Cross-sectional occlusal projection

According to the SLOB rule, when two dental images are compared, the object that lies to the lingual appears to have moved in the same direction as the PID, and the object that lies to the buccal appears to have moved in the opposite direction as the PID

Both statements are true

Your patient indicates he was shot around tooth number 30 with a BB when he was younger. The BB is still there. He would like it removed. You have been asked to take a dental image of the area to locate the buccal-lingual and anterior-posterior position of the BB. Which of the following would you take

Mandibular occlusal image

Advantages of panoramic receptors over intraoral periapical receptors include visualization of (1) impacted third molar teeth, (2) jaw fractures or (3) large lesions in the posterior mandible?

1, 2, 3

You are examining your patient's panoramic image. You notice that the molars and premolars on the right side are larger than the teeth on the left side. What patient positioning error did you make

The patient's head was turned to the left

In panoramic imaging, the x-ray tube rotates around the patient's head in one direction while the receptor rotates ______ direction

Horizontally in the opposite direction

In panoramic imaging, the ______ is a theoretical concept used to determine where the dental arches must be positioned to achieve the clearest image

Focal trough

The closer the rotation center is to the teeth, the narrower the focal trough. In most panoramic machines, the focal trough is wide in the anterior region and narrow in the posterior region

The first statement is true; the second statement is false

The collimator used in panoramic imaging has an opening in the shape of a ______ slit

Narrow vertical

The tubehead of the panoramic unit always rotates ______ the patient's head as the receptor rotates ______ the patient

Behind; in front of

You should have your 75-year-old patient remove her partial dentures and her hearing aids before taking a panoramic image because ghost images occur that could cover diagnostic information on the panoramic image

Both parts of the statement are true

The panoramic image of your patient has two radiopaque areas, one on each side, in the bottom portion of the image. What do you need to do to correct the error

Use a lead apron without a thyroid collar

A "reverse smile line" is seen on the image if the patient's

Chin is tipped up

The anterior teeth will appear "skinny" if the

Teeth are positioned too far forward on the bite-block

Compact bone is also called ______ bone

Cortical

The ______ the trabeculations, the ______ radiolucent the area of cancellous bone appears

Larger; more

A pointed, spikelike protrusion of bone is a

Spine

A foramen is a(n)

Opening or hole in bone that permits the passage of nerves and blood vessels

A ______ is a bony wall or partition that divides two spaces or cavities

Septum

This foramen is almond shaped and is located between the apices of the maxillary central incisors

Incisive foramen *

On a ______ periapical image, the nasal fossa appears as a large ______ area located above the roots of the maxillary incisors

Maxillary; radiolucent

The median palatal suture is located between the two ______ of the maxilla

Palatine processes

On a maxillary periapical image, the floor of the nasal cavity appears as a ______ band of bone ______ the maxillary incisors

Radiolucent; above *

On a maxillary periapical image, the inferior nasal conchae appear as a ______ mass within the nasal cavity

Diffuse radiopaque

Bony septa and nutrient canals may be seen within the walls of the

Maxillary sinus

The inverted Y is a ______ line above the maxillary ______

Radiopaque; canine

Interdental nutrient canals are most often seen in the

Anterior mandible

Your patient is pointing to the mental ridge on his dental image. He is pointing to the ______ portion of the mandible

External surface of the anterior

The mental fossa is located ______ the mental ridge in the mandibular ______ region

Above; incisor

The mental foramen is frequently misdiagnosed as a ______ because of its apical location

Periapical granuloma

On a dental image, the mylohyoid ridge is a ______ band that may appear to be continuous with the ______

Radiopaque; internal oblique ridge

Which of the following structures may be seen on both periapical and panoramic images

Mental foramen *

The ______ foramen is a tiny hole or opening in bone located on the internal surface of the mandible near the midline

Lingual

The mastoid process is a marked prominence of bone located ______ to the temporomandibular joint (TMJ)

Posterior and inferior

Which of the following structures is part of the sphenoid bone

Lateral pterygoid plate

The ______ is a long, thin, pointed process below the external auditory meatus

Styloid process

The ______ articulates with the glenoid fossa

Mandibular condyle

The lateral pterygoid plate is a wing-shaped bony projection of the ______ bone

Sphenoid *

On a panoramic image, which of the following structures appears as a radiolucency

Pterygomaxillary fissure

On a panoramic image, the infraorbital foramen may be superimposed over the ______

Maxillary sinus

On a panoramic image, the incisive foramen appears as an almond-shaped radiolucent area located ______

Between the roots of the maxillary central incisors *

The nasal cavity is also known as the

Nasal fossa

The zygomatic process appears Y-shaped on images and appears radiolucent on images

Both statements are false

The ______ is a marked prominence of bone found on the anterior superior ramus of the mandible

Coronoid process

On a panoramic image, the ear is viewed superimposed over the

Styloid process *